先锋PIONEER SX-3800电路图
Sefvice
nual
FM Ouartz Locked
STEREO RECEIVER
ii,,i i, i,,.., s r - ft3rc:rl ttr:;!'"; L *,.ir"*.t''
s(/ -i'- pSc2.ies-
-borf
o^ Sl"a&t'-1r,{:.-'i,
six-gaoo
(DrrroN€ER.
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
MODEL SX.38OO
COMES IN FOUR VERSIONS
DISTINGUISHED
AS FOLLOWS:
Type
Volt4e
Remarks
K U
120V only
U.S.A. model
s/G
1 10V, 120V, 22QV, and 240V (Switchable)
U.S. Militarv model
s
1 10V, 12OV, 22OY , and 24OV (Switchabte)
General exDort model
KC
l20V only
Canada model
r This service manual is applicable
to the KU type. When repairing the S/G and S Wpe, please
see the additional service manual lp 47 -p571. When repairing the KC type. olease see the a-
dditional service
manual (ART-519).
CONTENTS
I
;
t
I
T
I
it
II
1. SPECIFICATIONS
2 , F R O N T P A N E L F A C I L I T I E S
3. BLOCK DIAGBAM
4. CIRCUIT DESCRIPTIONS
4.1 FM Tuner
4.2 AM Tuner
4.3 Display Circuit
4.4 EqualizerAmplifier
4.5 Tone Control Amplifier
4.6 Power Amplif ier . . .
4.7 Power Indicator
Circuit
4.8 Protection Circuit
D I S A S S E M B L Y . . . .
PARTS LOCATION
D I A L C O R D S T R I N G I N G
ADJUSTMENTS
8,1 FM Tuner
8.2 AM Tuner
22
8 . 3 P o w e r A m p l i f i e r . . .
2 3
8.4 FL Indicator
Circuit
24
9 . E X P L O D E D
V I E W
2 5
10. SCHEMATIC
DIAGRAM, P.C. EOARD
CONNECTION
DIAGRAM AND PARTS LIST
10. 1 Schematic
Diagram
3l
10.2 P.C. Board Connection
Diagram
35
1 0 . 3 P a r t s L i s t
. . . , . . . 4 1
1 1 . P A C K | N G . . . .
4 6
A D D I T I O N A L
S E R V I C E M A N U A L
I . S P E C | F | C A T | O N S
. . . . . 4 7
2. CONTRAST OF MISCELLANEOUS
PARTS . . . . 48
3. SCHEMATIC
DIAGRAM, P.C. BOARD
PATTERNS
AND PARTS LIST
3. 1 Schematic
Diagram
49
3.2 Switch Assembly
{AWS.148)
57
5.
1
8.
3
5
7
I
o
o
1 2
1 2
1 2
1 4
1 4
1 6
1 7
1 9
20
e
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
I
I
t
r
t
t
t
t
I
t
t
T
t
t
t
t
I
t
I
1. SPECTFTCATIONS
Power Ampl if ier Section
Continuous
Power
0utput
of 60watts*
per chan-
nel, min.,
at Sohms
from 20Hertz
to 20,000
Hertz
with n0 m0re
than 0.005%
total harmo'
nic distortion,
Total Harmonic
Distortion (20 Hertz to 20,000 Hertz,
I ohms)
continuous rated power output . . No more than 0.005%
30 watts per channel
power output
No more than 0.005%
Intermodulation
Distortion (50 Hertz : 7,000 Hertz = 4 : 1)
continuous rated power output
No more than 0.0057o
30 watts per channel power output
No more than 0,005%
Frequency
Response
. . . . . 5 Hertz to 200,000 Hertz l! OA
lnput Sensitivity/lmpedance
(POWER
AMP lN)
or,rri
1v/50 kilohms
Speaker
A, B, A+B
"-:
:: ::"::'': 1*:": 1o i*
He*z'
8 0hms)
Hum and Noise (lHF, short-circuited,
A network)
1 1 5 d 8
Preamplifier Section
I nput (Sensitivity/l
mpedance)
PHONO
2.5mV/50 kilohms
A U X , T A P E P L A Y 1 , 2 . . . . . . . 1 5 0 m V l 5 0 k i l o h m s
Phono Overload
Level {T.H.D.0.005%,
1,000 Hertz)
P H O N O
. . . . . 2 5 0 m V
Output ( Level/l
mpedance)
T A P E R E C I , 2
. .
. . , . 1 5 0 m V
PREAMP
OUT (Rr_: 50 kilohms)
- . . . . 1 V / l k i l o h m s
{ V o l u m e :
m a x . }
Total Harmonic
Distortion (20 Hertz to 20,000 Hertz)
Tone Control
BASS .
tSdB (100H2)
T R E B L E
. . . . .
r ' , l 0 d B ( 1 0 , 0 0 0 H 2 )
Subsonic
Filter .
15Hz (-6dB/oct.)
Loudness Contour (Volume control set at *40d8 position)
. . . . +6dB (100H2),+3dB
(10,000H2)
Hum and Noise (lHF, short-circuited,
A network)
P H O N O .
. . . . . 8 2 d 8
A U X , T A P E P L A Y
1 , 2 . . , . . . . 1 1 O d B
A t t e n u a t o r .
. . . . - 2 0 d 8
FM Tuner Section
P H O N O
( R E C O U T )
A U X , T A P E
P L A Y 1 , 2 . . . . . .
Frequency
Besponse
PHONO (RIAA Equalization)
or", iori ,ro" i ,';'o^u"'
to 20'000
Hertz
t0'2dB
Usable
Sensitivity
(lH F )
50dB Ouieting
Sensitivity
MONO
STEREO
Signal-to-Noise
Ratio
MONO
STEREO
Distortion (at 65dBf)
MONO l00Hz.
l k H z .
6kHz .
STEREO IOOHz.
l k H z .
6kHz -
Capture Ratio. ,
Alternate Channel Selectivity
4 0 0 k H z
. . , . . , 7 f t 8
Stereo Separation
1 k H z .
. . . . . . 4 5 d 8
3 0 H 2 t o 1 5 k H 2 .
. . . . . . 3 5 d B
Frequency Response
. . . . 2 } H z t o 1 5 k H z 1 ! l o e
SpuriousResponse
Ratio, . . . . . . 65dB
l m a g e R e s p o n s e R a t i o
. . . 6 5 d B
l F R e s p o n s e R a t i o . .
. . . . 9 0 d B
A M S u p p r e s s i o n R a t i o
. . . 5 5 d B
SubcarrierProduct
Ratio . . . . . . . 50dB
S C A R e j e c t i o n R a t i o
. . . . 6 4 d B
Muting Thteshold
19.2dBf (5pV)
Antenna lnput .
300 ohms balanced,
75 ohms unbalanced.
10.3dBf {1.8itv)
16.2dBf (3.6sV)
37dBf (39pV)
83dB (at 65dBf)
78dB (at 80dBf,
0.1o/o
a.a7%
0.15%
O.2Yo
0 . 1 5 %
0.25%
r.odB
No more than 0.005%
{10V output}
No more than 0.005%
(10V output)
7Hz to 8o,0oo Hertz ]f aa
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
Eix-3El00
I
t
r
r
t
t
t
;
t
t
t
t
rl
t
rl
t
il
AM Tuner Section
Sensitivity
(lHF, Ferrite antenna). . 300pV/m
{lHF, Ext.antenna}
. . . 15pV
S e l e c t i v i t y
. . . . . 3 0 d 8
S i g n a l - t o - N o i s e B a t i o
. . . .
5 0 d B
l m a g e R e s p o n s e R a t i o
. . . 4 0 d B
l F R e s p o n s e R a t i o . .
. . . . 4 0 d B
A n t e n n a
. . . . F e r r i t e l o o o s t i c k a n t e n n a
Audio Section
Output ( Level/l
mpedance)
F M ( 1 0 0 % M o d . ) .
. . . . . 6 5 0 m V l 1
k i l o h m s
A M ( 3 O % M o d . )
.
. . . . .
2 0 0 m V / 1 k i l o h m s
Semiconductors
f C s . . .
. . . . . . . 1 7
F E T s .
. . . . . . . 6
T r a n s i s t o r s
. . . , . 7 1
D i o d e s
. . . . . . . 5 8
Miscellaneous
P o w e r R e q u i r e m e n t s
. . . . A C i 2 0 V , 6 0 H z
P o w e r C o n s u m p t i o n
.
. . . 2 0 0 W ( U L l
D i m e n s i o n s
. . . . 5 0 6 { W } x 1 6 4 { H )
x
4 3 4 { D } m m
19-15116(W)
x6-7/16
( H ) x 1 7 - 1 1 1 6 ( D )
i n
Weight (without package)
16.2k9 (351b 12oz)
Furnished
Parts
Operatinginstructions
. . . . . . . . . 1
F M T - t y p e a n t e n n a
. . . . .
I
* Measured Dursuant to the Federal Trade Commission's Tnde
Regulation rule on Power Output Claims for Amplif iers,
NATE:
Specifications and the design subject to poisible modifications
without notice due to improvements.
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
t
T
t
t
r
I
t
t
r
t
I
T
r
T
t
2. TRONT PANEL FACILITIES
c POWER
SWTTCH
Set this switch to ON to supply power to the receiver.
There will be a short delay when it is set to ON, because
the muting circuit has been actuated to suppress
the
unpleasant noise that is sometimes
generated
when the
power is switched on and off .
O spERrER
swtrcHEs
Depress the switch corresponding
to the speakers
con-
nected to the SPEAKERS
terminals
(A or B) on the rear
panel.
You can depress both of these buttons to listen to the
sound from two pairs of speaker rystems at the same
time.
@ gnlcHrNEss
sELEcroR
Use this switch to select the brightness
of the power
meter and the frequency
displav.
BRIGHT: When using the receiver
in daylight or other
D I M :
bright locations.
At night or in dark locations when the exist-
ing brightness
is too high.
CI POWER
METER
This meter allows you to read out the rated power level
on the fluorescent display tube when speakers
with a
nominal impedance of g ohms are connected to the
speaker terminals.
@ orel PoINTER
This pointer indicates
the broadcasting
stations.
@ bunnrz LocKED tNDtcAToR
This indicator lights up after the optimum tuning point
has been obtained and displays that the receiving
state is
stabilized
by the built-in quartz lock circuit.
O TTU STEREO INDICATOR
This indicator lights up when receiving an FM stereo
program if the FM muting off switch is released.
,o SIGNAL INDICATOR
This indicator lights in sequence
from left through right
during the tuning of an AM or FM broadcast in accord-
ance with the strength of the signals being received.
The optimum tuning point is where the maximum
number of indicators light.
@ rururruc
tNDtcAToR
When tuning in an FM station, the optimum reception
point is indicated when the center indicator lights up.
When the left indicator has come on. rotate the tuning
knob slightly clockwise.
When the right indicator comes
on, rotate the knob slightly counterclockwise-
@ rnEouENCY DTSPLAY
This indicates
the frequency
which is tuned.
With FM reception, the letters ,,FM., appear on the left
of the display and ',MHz,' on the right. With AM recep.
tion, "AM" appears
on the left and ,,kHz.. on the right.
These change when the function selector position is
changed.
0 rururruc
KNOB
Use this knob to tune in to broadcasting
stations.
c} FM MUTTNG
OFF SWTTCH
When this switch is released
and an FM broadcast
tuned
in, the muting circuit is activated inside to suppress
the
annoying interstation noise between the broadcasting
frequencies
for noise-free
reception. When the broadcast-
ing station is far away or when receiving a station in a
fringe area, set the switch to the OFF position and then
tune in. lf there is a broadcasting
station with a strong
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
signal level on the air next to a station whose program
you want to receive. you may not be able to tune in
satisfactorilv because the sound will be drowned out
by the stronger signals. ln cases like this, set the FM
MUTING OFF switch to OFF {depressed
position) and
tune in. The muting circuit does not work when the
tuner is receiving
AM broadcasts.
lf tuning has been
performed after the FM MUTING OFF switch has been
depressed and a station selected, the quartz locked
circuit is set to the OFF mode and the LOCKED
indicator
does not light.
{"} FUNCTTON
SELECTOR
Depress the function switch which corresponds
to the
program source. Turn the volume control down first
before selecting a different function switch while the
sound from one program source is being reproduced.
FM:
AMr
Depress
this switch for FM broadcasts.
Depress
this switch for AM broadcasts.
AUX:
Depress this switch when listening to an
audio component connected to the AUX
jacks.
PHONO: Depress this switch when playing a record
on the turntable connected to the PHONO
jacks.
NATE:
Only one function swirch should be deplessed at a time.
@ volunnE coNTRoL
Use this control to adjust the output level to the
speakers
and headphones.
Turn it clockwise to increase
the output level
. No sound will be heard if you set it to
"o."
(} MUTING SWITCH
Set this switch to the *20d8 position to attenuate the
audio output by 20d8. There is no need to adjust the
volume control if you this switch when turning down
the audio output temporarily and when changing
over
records or tapes.
LOUDNESS
SWITCH
When listening to a performance
with the volume
control turned down, depress this switch and the bass
and treble will be accentuated.
When the volume is low, the human ear finds it harder to
hear the bass and treble than when the volume is high.
The loudness switch is thus designed
to compensate
for
this deficiency.
By depressing
this switch, the bass and
treble come through much more strongly and the sound
takes on a punch even when the volume control is
turned down,
@ gRl-Rr\cE coNTRoL
Use this control to balance the volume of the left and
right channels. First, however, set the mode switch to
MONO. lf the sound appears to be louder on the right, it
means that the volume of the right channel is higher.
Turn the balance control to the left and adjust. Con-
versely. if the sound appears to be louder on the left, it
means that the volume of the left channel is higher.
Therefore, turn the balance control to the right and
adjust. After adjusting. return the mode switch to
STEREO.
@) TAPE MONTTOR
SWTTCHES
Employ for tape playback or to monitor a recording in
progress.
1: Playback or monitoring of a tape deck connected to
the TAPE 'l jacks.
2:, Playback or monitoring of a tape deck connected to
the TAPE 2 iacks.
NOTES:
l. 8e sure to set the switches to the upper IOFF) position
when playing records or listening to broadcasts.
2. When recording with tvvo tape decks simultaneausly. do nat
operate the tape monitor I switch as this will interrupt the
signat to the T,APE 2 deck.
G} MODE SWITCH
Use this switch for selecting mono or stereo perform.
ances.
STEREO: Set to this position for normal operations.
MONO:
When set to this position, the left and right
channel signals will be mixed and repro-
duced monophonically
from both speaker
systems.
AD LOW FILTER SWITCH
When this switch is set to 'l SHz, a 6dB/oct attenuation
can be provided {or f requencies
below 15H2. This
means that you can cancel out noise in the ultra-low
frequencies which is generated by low-pitched rumble
from a turntable and other forms of distortion.
Although this noise cannot be heard, it can generate
intermodulation
distortion and damage
the speakers.
@ BASS AND TREBLE CONTROLS
When turned clockwise from the OFF position, the
response in the bass and treble range, respectively, is
boosted. Turning
counterclockwise attenuates the
reSponse.
At the OFF position the tone control circuit is bypassed
and frequency response is flat.
€} HEADPHONE
JACK
Plug the headphones into this jack when you want to
listen through your stereo headphones.
Release both speaker switches if you want to listen to
the sound through your headphones
only.
t
I
t
I
l|
I
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
t
t
t
It
I
I
It
I
I
l
j
1 6 l
l a r a M e
l -
'
r v o -
- l ) l
l F v / t p ' t q
l - -
I * I
| ,r dve cfrfc-.,a I
l
[
-
l
l
-
lhTjl -rr-
|
r'-; 'r
l-68{"-l;;l I;;;;l-,
[ J l
I l f ' : r e I
p a c N o
@
a u x @
3. BLOCK DIAGRAM
R F Block
7 5 n O
:cono
o
.t
i'"l i,-qilgl
A U D I O
U U I I N O
,
T
a
rC { HA120r
)
\ 1 , F 0 F F S E T
.J AOJ,
l O W F I L T g F
rc { PA3007-A )
4 6 . 4 6 8
ll
'1-.'!^ "^:r9::i;f,
.-6: -@
,
l l
l
1-a--@
f-*--e
l-8
-O
','.." .**,i 1]l :,^ n ""o"r.
€ !uoa€ sc E NT
rnorcAron IuBe
--€F---.o
SPEA(ER B
a
six-3aoo
OU'TPUT
L
R
5r€ffEO
!NOlCnI0R
ovaRTz locKf,o
ril9rcaToR
SP(.AXERS
S P e A X l P
r \ O I C A I O R S
--*9--@
f--q-*@
rc ( PA4O06-A l
6
! 5 e S
1 PFrscalla l_
1
F M . . i d
I
_T--
*F;'* 1
l , r E r , I
I
I
;(9
PL AY
P E .
P L A Y
.A
Ii
+ t 5 . 5 v
- { 5 . 5 V
I
I
I
I
I
t
I
I
t-POrtT StcxaL
llO'a.AtOA 0AtvE
R C H A N N € L { 5 A M E A 5 L C H A A ] I i € i . i
t L F . A I ' '
I R A I S ' O R M ' R
/_\
- - * - 1 }
o r ^ L s ( a L E
v
L 4 9 p S
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
4. CIRCUIT DESCRIPTIONS
4.1 FM TUNER
Front End
The FM front end of SX-3800 includes a 3
ganged tuning capacitor, a dual-gate MOS FET-
equipped L-stage RF amplifier, and a modified
Clapp circuit local oscillator. This oscillator is a
voltage controled oscillator employing a vari-cap
(variable capacitance diode). When the quartz-lock
system (refer to "Quartz-lock system") is not in
operation, a constant voltage is applied to the
diode.
lF Amplifier and Detector
These employ 3 ICs and 3 dual-element ceramic
filten. The IC (HA1201) of the first 2 stage con-
stitutes a single-stage differential amplifier current-
limiting limiter. The IC (PA3007-A) in the third
stage,an improvement on the former IF system IC
(PA3001-A), includes an IF limiter amplifier,
quadrature detector, meter drive, and other cir-
cuits. Performance in terms of distortion, S/N
ratio, delay characteristics, and other parameters,
shows a marked improvement in comparison to
the PA3001-4.
Multiplex Decoder
The recently developed multiplex decoder IC
(PA4006-A) combines MPX decoding with muting
functions in a single IC, thereby handling the
functions of the more conventional MPX IC
(PA1-001-A) and AF MUTING IC (PA1002-A).
Distortion ratings and SIN ratio have been
further improved by incorporating a chopper type
MPX decoder. The chopper type switching circuit
(see Fig. 4-1) operates by switching the signal
either to ground or to the through circuit, thereby
eliminating the generation of unwanted noise or
distortion. Furthermore, since the PA4006-A fea-
tures DC direct-coupled switching with the detec-
InOut
Output
JU1IIIUIJIJUUI .^
I
Switchins
,is".rc-1q/
-
|
t
h
L
Fig.4-1 Chopper type switching circuit
ouartz-Lock system
The quartz-lock system featured in the SX-3800
stereo receiver is a frequency servocontrol system
employing a crystal resonator. Any displacement in
the intermediate frequency (iF) is detected as a DC
voltage by the discriminator (equipped with a
crystal resonator), resulting in the local oscillator
frequency being corrected and subsequently
locked. This extremely stable frequency servo-
control system thus ensures that tuned frequencies
remain tuned securely for as long as required.
When the IF signal appears at pin no.l? of the
IF system IC (PA300?-A), it is amplified and
applied to crystal detector (see Fig. 4'2) which
consists of diodes connected in parallel in a series
resonance circuit equipped with a crystal resona-
tor. The resonance frequency is the same as the IF
frequency (10.?MHz), which means the impedance
at this time will be minimal, resulting in the output
being reduced to a minimum level. If the input fre-
quency increases, the reactance of the capacitance
CRYSTAL DTTECIOR
OC AMP
WITH LIMIiER
L P F 1 r
T
t
t
t
;
;
;
I
;
I
I
t
r
T
clRcull
Fig.4-2 FM quartz-lock sYstem
tor, there is no deterioration in separation at the
low frequency end.
Besides the decoder and muting circuits, the
PA4006-A also incorporates the pilot signal cancel-
ler, stereo auto selector, VCO killer circuit, ivluT
amplifier, and MUT control circuit.
Composite signal
dhllL'
T
E}
FM FRONT ENO
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
T
t
r
t
I
t
I
r
t
I
t
t
rl
l
t
I
I
T
t
stage (C) is reduced, and the reactance of the in-
ductance stage (L) increased, resulting in AM
detection by D2 which leaves the positive portion
of tlie IF signal. If the input frequency decreases,
L
stage reactance is decreased and C stage reactance
increased, resulting in AiVl detection by D1 which
leaves the negative portion of the IF signal. The L
stage and C stage reactances increase as the deglee
of detuning in the respective directions is in-
creased, resulting in a subsequent increase in the
detector output. By thus attaining S-curve charac-
teristics, FM detection becomes possible. Since the
IF signal is an FIvI signal frequency deviation due
to modulation will be symmetrical about a central
axis, And if the central frequency is equal to the
resonance frequency, the detector output DC level
will be zero. If, however, there is any displacement
in the central frequency, frequency deviation in
respect to the detector will become asymmetrical,
resulting in the generation of a DC voltage. This
DC voltage is passed through LPF1 (IF filter) and
LPF2 (AC filter) to form a correction voltage
which is applied to the variable capacitance diode
in tlre iocal oscillator, thereby correcting the
oscillator frequency to obtain a constant tF (i.e.
a constant tuned frequency).
Since the central frequency of the crystal detec-
tor is regulated by the crystal resonator, tuned fre-
quencies of extremely high stability are obtained.
r Limiting the Locking Range
If lhe quartz-lock range is too wide, it will
overiap with strong adjacent broadcasting frequen-
cies and result in considerable tuning difficulties.
A DC amplifier is therelore used as a limiter
(limiter action by NFB circuit zener diodes) which
restricts the voltage applied to the variable capaci-
tance diode, thereby limiting the quartz-lock range.
A DC voltage appea$ at pin no.L3 of the IF
system IC (PA3007-A) when the antenna input
level drops below 5pV, or when the tuned fre-
quency has been detuned by more than r100kHz.
This DC voltage (FM muting signal) is applied to
the gate of Q2 (fET) via a Schmitt circuit, result-
ing in the FET being turned on, and the quartz-
Iock circuit being turned off.
sx-gaoo
4.2 AM TUNER
The AM tuner section consists of a 2-ganged
tuning capacitor plus an IC (HA119Z) which con-
tains a l-stage RF amplifier, converter, 2-stage IF
amplifier, detector, and AGC circuit.
The AM STEREO OUT terminal on the rear
panel is for connecting to an AM stereo broadcast
decoder adaptor. The signal appearing at this ter-
minal is the converter output passed via a buffer
( emitterf ollower) stage.
4,3 DISPLAY CIRCUIT
Frequency Display
Frequencies received by the SX-9800 are dis-
played in digital form by fluorescent indicator tube
(FL tube). Each digit employs up to ? segments
(a - e) (see Fig. 4-3) to display all numerals from
0 to 9 (with the exception of the left hand digit
which employs only 2 segments b and c).
ofi'
Fig.4-3 7-segment
digit display
The signal source during both AM and FM recep-
tion is the local oscillator. The signal is passed via
a buffer amplifier (FET) to the prescalar IC
(M54451P) where it is subjected to frequency divi-
sion (1/8 for AM and L/80 for FM) before being
rFRlied to the frequency counter IC (pDb0Og).
This IC is responsible for the dynamic drive of the
?-segment S-digit display (each digit being turned
on according to time-shared sequential scanning).
An outline of the composition of pDb009 is
given in block diagram form in Fig. 4-b. With the
FL tube a - g segments (anode) for each digit con-
nected in parallel, the D1 - Db time division pulse
signals (see Fig. 4-6) apptied to each grid (inde-
pendent grid for each digit) result in the digik
being lit up in succession from the left hand side.
Each digit is lit up for lms during each bms inter-
AM LOCAL
osc.sr6NAL
FM LOCAL
OSC.SIGNAL
F M " a M s E L g c r r o N
F L T U B E
a
S I G N A L
Fig. 4-4 Frequency display block diagram
a
rc (M5445rP)
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
O I G I T O R I V E R
S E G M € N T D R I V E R
MU !TI PLE XER
P R E S E T A E L € 5 - D I G I T
O E C I M A L C O U N T E R
2 2 - 8 l I
r 1 6
R O M
G N D
Fig.4-5 Block diagram
of PD5009
I
I
I
I
I
I
I
t
I
r
il
i
t
t
t
val. Pin no.? of PD5009 is the brightness selector
terminal. The time division pulse width is set to
8009s for H level input signals, and to 200ps for
L level signals, thereby varying the degree of FL
tube brightness (by varying the segment lighting
period). Note that since the pov.er indicator FL
tube is driven by static drive, the degree of bright-
ness may be varied by changing the grid voltage.
The 5.12MHz crystal oscillator generates the
basic signai used in the preparation of the time
division pulse signal and the counter gate circuit
control signal.
Terminals S1 - S4 (pin nos.3 - 6) are used in
designating reception mode. The 2 reception
modes employed in the SX-3800 (see Table 1) are
designated by varying the combination of input
levels (H and L). The 3 different IFs during FM
mode are required in coping with IF offset in the
IF ceramic filter stage, 53 and 54 being preset
during FM mode according to the ceramic filter
characteristics.
Although the SX-3800 FM stage quartz-lock
system is capable of locking any frequency within
the FM band, the L0kHz digit (digit in the second
decimal place) in the FM frequency display will
appear only as 5 or 0.
The frequency display FL tube also incorporates
the TUNING and SIGNAL indicators. And al-
though the segments (anode) for these indicators
are static driven by the corresponding drive cir-
cuits, the edd is driven according to the D3 time
division pulse timing, thereby placing the segments
1 0
I
n
l
l
t
t
r
-
o,w
o o M
*l-w
,,iw
- ' l ' * i * i i l l
t{--
tm3
+
8 C = L ( D l M )
F i g . 4 - 6 D 1 - D 5 t i m e d i v i s i o n p u l s e s i g n a l s
under dynamic drive. In addition, the AM and FIW
indicators in the frequency display section are lit
according to the Db timing, while the kHz and
MHz indicators are lit accordine to the D1 timine.
MODE
s1
S2
s3
I
H
L
H
l F { M H z )
F M
H
L
L
1 07 3
H
L
H
H
1 0 . 7 0
H
L
't 0.67
AM
L
H
H
L
450kHz
T a b l e 1
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
r
t
T
l|
t
t
ll
t
t
f
f
I
I
t
t
t
t
I
SIGNAL lndicator Circuit
sx-g€too
Fig. 4-7 SIGNAL indicator
drive circuit
The SX-3800 SIGNAL indicator consists of an
FL tube 5-point indicator display. The signal meter
drive signal obtained from the FM IF system IC
(PA300?-A) and AIVI tuner IC (HA119?) is first
amplified and then applied to the indicator drive
IC (HA12010). This IC contains 12 pairs of voltage
comparators similar to those employed in the
power indicator circuit, b of these pairs being used
to drive the SIGNAL indicator.
TUNING lndicator Circuit
The TUNING indicator consists of a center
tuning indicator (which lights up when a broad-
casting station frequency is properly tuned) and
2 detuning direction indicators which indicate the
direction in which the station has been tuned awav
from. The corresponding drive circuits are outlinei
in Fig. 4-B below.
The TUNING indicator is activated once the
station has been tuned to within t100kHz of the
center frequency. This is because e16 is turned on
and Q21 turned off (resulting in the detector dif_
feren^tial amplifier le19 & e20J being tumed off
and Q24 being turned on) by the FM muting signal
appearing at pin no.lB of the IF system IC
{PA3007-A) and passed via the Schmitt circuit
(Q17 & Q1B) rvhen the station is tuned away by
more than t100kHz.
The DC voltage on pin no.4 of pAB007_A de-
scribes an S curve when tuning to and away from a
particular broadcasting frequency, the voltage on
pin no.2 serving as the reference level. This DC
Fig. 4-8 TUNING indicator
drive.circuit
voltage is amplified by the differential amplifier
(Q19 & Q20) and then applied to a polarity detec_
tor switch circuit (eZZ & e2g).
When tuning to a frequency from the high fre_
quency side (or tuning away from the frequency
to a higher frequency), the voltage on pin no.4 will
be higher than that on pin no.2. The e20 collector
voltage will thus be lowered and the e1.g collector
voltage raised, resulting in e2B being tumed on,
and the higher frequency (right hand side) detun-
ing direction indicator also being turned on. When.
SCHMITT
CIRCUII
rc (PA30(r/-A )
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
on the other hand, the broadcasting frequency is
approached from the iow frequency side (or when
tuning away to a lower frequency) the pin no.4
voltage will be lower, resulting in Q22 being tumed
on to light up the lower frequency (left hand side)
detuning direction indicator. When either Q22 or
Q23 is on, the Q24 base voltage will be high,
resulting in Q24 being tumed on and Q25 tumed
off, which means that the center tuning indicator
will not be lit up,
Once the broadcasting frequency has been tuned
properly, the voltages on pin nos.2 & 4 will be
equal. Consequently, q22 and Q23 will both be
turned off, which means that neither of the detun-
ing direction indicators will be on in this case. And
since Q24 is tumed off because of the decreased
base voltage, Q25 will be turned on, and the center
tuning indicator light up. Furthermore, C77 is
charged up via R99, resuiting in Q26 being tumed
on, thereby lighting up the Quartz Locked indi-
cator LED.
4.4 EOUALIZER AMPLIFIER
?his circuit is an NFB type equalizer amplifier
with
newly
developed high performance IC
(HA1201?P).
This IC is a low-noise and low distortion type,
and provide an openloop gain of 105d8. The main
performance specifications for this circuit include
a voltage gain of 35.5d8 (at lkHz), a phono
dynamic margin or maximum allowable input level
of 250mV (1kHz, 0.}Abc/o THD), S/N ratio of
82dB (at 2.5mV input, IHF-A), and equalization
within t0.2dB (20H2 * 20kHz).
4.5 TONE CONTROL AMPLIFIER
This circuit is an NFB type tone control ampli-
fier with newly developed high performance IC
iHA12017P).
4.6 POWER AMPLIFIER
Amplifier Circuit
The basic circuit arrangement of the power
amplifier is shown in Fig. 4-9. The first stage is a
differential amplifier comprising PNP twin transis-
tor (Q2), the load circuit of which is a current
mirror employing an NPN twin transistor (Q3).
The current mirror provides push-pull operation in
this stage, which serues to cancel even harmonics
and further increase gain.
Q1 in the input circuit absorbs outflorv of base
current from Q2, and prevents the generation of a
DC voltage. Because Q1 follows any temperature
drift in Q2, temperature drift of the center point
voltage is prevented.
The pre-driver stage (Q4, Qb) is a Darlington
arrangement, the load circuit of which employs a
constant-current source (Q6) resulting a high volt-
age gain.
The power stage bias voltage is supplied by the
high speed bias servocontrol circuit. The high
speed bias servocontrol circuit provides non-
switching operation in the power stage (refer to
"High Speed Bias Servocontrol Circuit").
The power stage (Q13 - Q16) is a 2-stage Dari-
ington arrangement, the last stage is SEPP circuit
employing an SL RET (Super Linearit5' Ring
Emitter Transistor). The RET is a kind of IC con-
sisting of a number of smail transistors on a single
chip, with each transistor being connected ir"r
parallel via an emitter resistor. This provides
t
t
t
t
I
t
iIi
;
I
t d
Fig. 4-9 Power amplifier
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
I
I
r
rr
Tr
T
TIf,FtItFF
excellent high frequency characteristics compara-
ble lo those of a small-signal transistor. Further-
more, becanse lhere is no time clonstant in the NFB
circuit ir-r the lorv-frecluency region, amplification
is possibie dorvn to DC (DC inputs will be cut off,
hor,vever,
by the input coupling capacitor).
'I'he circuit features described above provide an
extremely wide polver frequency range (60W
+ 60W, 101-lz to ZOkHz, THD 0.005Va, Bdl).
High Speed Bias Servocontrol Circuit
By operating the power stage only within the
active region (no possible cut-off) and with mini-
mr-rm idle current, the high speed bias servocontrol
circuit prevents the generation of switching dis-
tortion and reduces heaf loss.
Operating Principle
Since idle current flows through normal class B
SI)PP porver stages (see Fig. 4-10) when no signal
is appliecl, the DC level is shifted by D and VR by
a fixed amount (w'itir the voltage across points X
ancl Y sen'ing as a bias). The voltages across points
X and Z, and Z and Y at this time will be equal.
When the positve portion of a signal is applied to
this circuit, the porver stage current on the NPN
side is increased,
and the voltage (Vn1) across both
ends of RB1 also heing increased, resulting in the
voitage across point X and Z being increased.
However, since the voltage across points X and Y
is practically constant, the voltage across points
Z anrl Y (PNP power stage bias) will be decreased,
resulting in the PNP power stage being cut off.
'I'he high speed bias servocontrol circuit in-
creases the voltage across points X and Y by the
same amount as the voltage increase across points
X and Z, thereby cancelling the voltage decrease
across poinls Z and Y, and preventing the PNP
polver stage from being cut off.
This high speed bias servocontrol circuit is out-
lined in Fig. 4-11. lVhen there is no signal applied
to the crrcuit, Q1 and Q2 are almost cut off,
while Q3 and Q4 u'ill be on. The voitage across
fhe collector and base of both of these transistors
(Q3 and Q4) at this time may be disregarded. Con-
sequently, rvith the power stage bias circuit con-
sisting of ,tr PN junctions formed by Q3, D3, and
Q4, and VR1. this circuit is equivalent to the
previous circuil shown in Fig. 4-10.
With R1 and D1 ensuring a constant flow of cur-
rent, the base of Q1 and point Z may be brought
to the same level on an AC basis (level fluctuations
due to the signal) by a simple shift in DC level.
Furthermore, Qf
may be considered emitter-
follower lvitli R3 as the emitter resistance.
sx-3aclo
When the voltage across points X and Z is in-
creased by tl're positive portion of the signal ap-
plied to this circuit, it becomes the input signal
of this emitter-follower (Q1). Since the emitter-
follower voltage gain is practically 1-, a voltage
more or less equal to that of the input signal (that
is, the voltage increase across points X and Z) is
produced at R3. And the R3 voltage is the voltage
applied across the base and collector of QB which
forms part of the power stage bias circuit. So the
bias voltage applied to Q3 will be in excess by the
same amount that the voltage across points X and
Z is increased (by positive portion of the signal)
above the voltage level when no signal is being
applied. Consequently, the increase in voltage
across points X and Z cancels the decrease in volt-
age across points Z and Y, thereby maintaining
the idle current without cutting the PNP power
stage off (noting that there actually is a slight
decrease in current). For the negative portions of
the signal, Q3 and Q4 are operated in the same
rnanner, thereby preventing the NPN power stage
from being cut off.
In other words, the high speed bias servocontrol
circuit acts to prevent any "poler stage cut-off"
signals from being applied to the polyer stage.
Fig. 4-'l 0 Normal power stage bias circuit
P R E - O R I V E R
P F E . O R I V E R
Fig. 4-1 1 High speed bias servocontrol
circuit
I J
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
i c ( ' t A 7 3 t 8 P )
t / ?
H O L O &
O C A M P
L € V E L
S H I F I
O F F S E T C O M .
P E N S A I O R
t
t
t
r
I
t
t
t
t
I
I
t
I
I
t
I
Fig. 4-12 Power indicator circuit
4.7 POWER ]NDICATOR CIRCUIT
s16NAL rN o*-l
F / L A M E N T
The SX-3800 output power indicators feature
fluorescent indicator tube (FL tube). In this tube,
thermionic emissions from the cathode are ac-
celerated into the fluorescent substance of the
segmental anodes, resulting in the emission of light.
This tube is used to indicate numerals, letters, and
other symbols.
An outline of the FL tube drive circuit is shown
in Fig. 4-12. The output circuit sj"tnal is applied to
pin no.6 ( ) of the IC (TA?318f -A). The IC con-
tains a detector circuit, conpressor (40d8), and
peak hold circuit for both left and right channels.
The dynamic range of the signal is thus contracted
by 40dB to obtain a "peak held" DC voltage.
The output pou'er indicator segments of tire FL
tube are driven by the HA12010 ICs (one for each
channel) equipped rvith 12 pairs of differential
amplifiers. These amplifiers are biased at increasing
levels, so each amplifier lvill commence to operate
separately as the input level increases. And since
these amplifiers apply the voltages to the output
power indicator segmetrts, each successive segment
will light up in turn as the input level rises.
4.8 PROTECTION
CIRCUIT
The purpose of this circuit is to protect the
speakers and the power amplifiers. The relay in the
output circuit is automatically opened in any of
the following cases:
L. During the "transient operations" lvhen the
power supply is turned on and off.
2. Upon detection of an overload, caused by a
short circuit in the ioad.
3. Upon detection of a DC voltage in the output
caused by component failure or accident.
Muting Operation when Power Supply is Turned
On and Off
With reference to Fig. 4-13 when the porver
supply is turned on, Q3 turns off due to *81 (l'he
time constant of the *81 circuit is very sma11.).
If there is no input (DC) on Qb and Q6, they will
be off, and the timing capacitor C1 charges up
through R8 and R6, and thus Q4 turns on. \Vhen
Q4 condr,rcts, tire relay operates, and the output
muting on the power amplifier will be removed.
When the polver supply is turned off, -81 rvill
abruptly decay, and Q3 will conduct owing to the
resiclual component of +81. As a result, C1 rvill
rapidly discharge, Q4 will cease to conduct, rvhere-
upon the relay will become de-energized and
restore mnting.
1 4www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
F
T
rr
T
T
T
I
I
t
T
T
I
I
I
I
I
I
Overload Detector
The overload detector circuit incorporates the
load (RL) in one side of a Wheatstone bridge. The
base and emitter of a sensing transistor (e1) are
connected to the opposite corners of the bridge,
so if RL decreases,
Q1 will become forward biased.
If RL falls below a prescribed value, e1 will turn
on, thereby C1 will rapidly discharge. As conse-
quence, Q4 will turr on and the relay will become
deenergized, thus causing the output circuit to
open.
DC Voltage Detector
The output circuit is connected to the e6 emit-
ler and Q5 base via a low-pass filter (Rg, C2).
Any DC voltages appearing the output circuit of
the porver amplifier, it wil] be applied to the e6
emitter and Q5 base. If the voltage is positive, eb
turns on. C1 will rapidly discharge. If the voltage
is negative, Q6 turns on. C1 will rapidly discharge.
As conseqnence, Q4 will turn on and the relay will
become de-energized, thus causing the ourpur
circuit to open.
six-gaoo
F ig. 4- 1 3 Protection circu ir
1 5
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
5. DISASSEMBLY
Bonnet Case
Remove the two screws O ot each side of the
bonnet case.
Bottom Plate
Remove the fifteen screws O to detach the
bottom plate.
Front Panel
Remove the all control knobs except push
knobs. Remove the two screws @ and two nuts
Q from the front Panel.
A\
s\$
Front panel
Bottom plate
i
I
t
l|
I
t
I
t
t
l
I
t
I
I
T
I
t
Bonnet case
f\,.\
$\
t o
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
I
I
I
6. PARTS
Front Panel
LOCATTON
Front panel assembly-
AN 8.851
AAD,226
Front View with Panel Removed
Fluoresc€nt
indicator tube
AAV.OO9
Remote push swirch -
sx-gEloo
:
The fi marh found on sotne camponent parts indicates
the importance of the sofety factor of the part. There-
fore, when replacing, be sure to use parts of identical
designation.
Push knob B
AAD-227
AAA.O66
Knob
AAB.24O
AAB-239
Fluorescent indicator tube
AAV-OO7
Dial shaft assembly
AXA.264
Push switch (FM MUTINGI
ASG-230
ASK-181
Variable resistor 1M {EALANCE)
ACT.021
Remoie lever switch (TAPE MONITORI
ASX-128
erminal {lNPUI, PFIE AMP OUT, POWEF AMP lN}
AK8{63
erminal (SPEAKE BS)
AKE.O54
AAC socket (AC OUTLETS)
'AKP-O42
.ii\AC power cord
ADG.O23
Lever knob
( S P E A K E
R S )
A S X , 1 3 5
Push switch (BR IGHTNESS)
ASG,230
; Leve' swrrch (POWER) -...
ASK-507
t
7
P h o n e j a c k l P H O N E S )
AKN.O30
Varrable resislor 'l 0k (BASS)
A C T - 1 3 5
V i l n a b l e
r e s i s t o r
1 0 k ( T B E B L E )
A c T - 1 3 6
Lever switch {N4ODE, LOW F ILTE R)
ASK.,] 52
Rear Panel
Terminal (AM STEREO OUT) -
AK 8.076
B a r J n t e n n a i l s s e n r b l Y -
A T B . 6 2 4
Slicie swrtch iDE-EMPHASISi
A S H . O 1 5
T e r m r r t a l
( A N T E N N A ) - -
- -
A K A . 0 1 3
T P r
r r r r r ; r l
( T A P E 1 . 2 ) -
AK 8"063
_
l
,
l
t
I
I
1 7
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
sx-3Etoo
P.C. BOARD CONNECTION
DIAGRAM
U
E
TUNER Ass'y
GWE-133
r
+
I i
s,rrprro&ffi
|
E?E-il-.---'ffi:tlJr,
I
"i;;:ii
i
liut
,o,@ rl==I I 7**
l:t'; ffii III +",:r- I nl .t t
r-'o
' ' | ,11",i
'*i'' r*'i; nnij:j :',Slt, *l; l.i .{i,,
$' iJ "',s|il,f ffi uJ,,tl
*i"
ffii,i{ ii-ll-.1
li '
*B #"ij"ffii i;fi!f*l:lH:f
=l rsHr:tj-l:f
+t
ts--lrg<
I lil't
r
l
'
l
r
;;f "t
| lrl
l
l
iiii'{t5h
l
o
( ilc
9'o" \,
o
*r- -r\'&
. f n f " l l l * l
wC ilu
jt'i {*r,.
I
*, ig+ .*B'
.ftd
.t.d-;'i r
Cltlctil
tlrr
;:Ji,-:
;r.{iT
;. '
."l|-*.Ji?,,I*l*.l**;ii{*,,.,[EJ*l.l\tTj-f:,.4""fr-iH3i
,,,i
ffi*,ffi[l " l*" i* ']*S-# H:' t illi"+i[',
ff J i*
*+S'ffiiig1+1-1
1i-;pf',
# , :;" F-*'..''l
1-Tii
" H l-tF-ili'*.+*j
' 'i,-l*,0.\i,r*
# i ,.,.... .!iF.E|i
:,1I*{
@ LEj I
'fHll*.is"
L. i$i.\1, +* # i i I
** **' ,l'*.t!S
,p--g;,,1,-*fi
IHT_i
:'- [ ' & | ;.i ffii"i:-i"i_fJ
lf HJi.lI'
' ffim*ffi$i,'i*
yffi*| * I ;;Htri
ifiHs
?, ,",,o,il+/''l I 4tt, l---J II '*.'i*l l-l idiii- it
8LK
T2
T - - - - - - ' l
*i','Sli,"
i { +6,Hi tir
wlrrii ilfl i
7 0
1..il
l . u l
t
l
t " n t
I t i t
t ' * l
o l
a
r
g
tb
lnl
I
--6
t o
''+
DET
GW
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
EOUALIZE
AWM - 22'
SWITCH Ass'y
GWS-146
SWITCH Ass'y
GWS-226
PLIO
(STEFEOI
8V 5OmA
ls
6
Itr {
T *i*.+,*,
1 '*l l* I
r.rr: I
i
I
i.ls, tn
",, I
'rr I
re.dl I
$ll 1';rl ilIl
h o
o
9 8 7
rz
| t ' h r r i b E
I
I l l l | L u s
I
l l r I I ? /
* t + + v
r l l * l l /
'd16l
1 u . 1 m f \
| 'li?
le's
t
*.-
W*l''
l l t t r I
l l i l l i
r
n
l
n
l
DETECTOR
GWX
-463
I hnl I
ll l:1,1 {
i ltfil i
l i l l
D ! * l l + h
l l i l
O l t !
r s t t 5 5
a? lS2a7J
a[{,r r
i'!; l-ilL
r.
t iT'it t l'
*i I it f* '
' * i , l r 4
&rsn
t(t_
&H&h
l l I I I
t l t t i
l
t
t
t
l
I _ l r a I
! t - f I
? t ? 1
J
l
l
l
k a . l t i . 1
urufrfr
ffi
Asdy
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
six-3E|c'c'
The counter IC (PD50
(AWV-009) has been de
values by appropriate c
or L leuel signals) applie
the wiring
(connecting
within
the equalizer a
differ slightly from the c
the grade of the FM c
into 3 ranhs accord.ing to
The R28 and. R29 resi
( AWM-227 ) constitute th
match the counter IC (P
assembly) with the FM I
haue been arranged acco
mic filter Fl - F3 (color
in the following table.
@ @
'BgOUI
' a .
= . d
l.i;'
c r I
.119 t
E0UALIZER Ass'y
AWM-227
INDICATOR
Ass'y
AWV-OO9
I
I
I
I
I
I
I
I
t
I
I
I
t
I
t
I
I
I
a t
t -
I t i
r l
rI
f'.,
Itii';
l"'
tI
t
I
{
PL4
PL7 (FM)
( PHONO}
V-4*7
8V 5OmA
6
! qt t
t t
l
l
t
l
KJ
lon
1
I i t
l r {
't'l r g',:: =S
I I
'tiii i?#ffi
?sc.6l fi'l
lnry
lir]'
ht L.l
I Ll t re"
g'J
LiT{{tF{TTTTTTT
- - - 1 * T i i l l t i l l
o' "oooo'
ol iW"Sl"H+Fj
-;:----:=# : l""i 1.,i i.,,: il,'
l l l l
I
i ' { 1 1 ' i . l ' ,
, l ' .
t l l t l '
; :
a a a I
I
q r - , o
h b h l r
h !
rwiriiiiri6, lii
,:rliii:i
t
t
t
I
I
I
i
i
l
j
j
j
i
t
t
. t t
p a
Hdi
I t l r
l l l r s
L
'
|
.
I ' D
r
x
h
l
h h h k
*3|0ru
I t I I t
l l t t i
l
t
t
t
r
i l l l r
'f 't I I
t { r t
? l ? ?
, / I t . l
lot.tdrk
slq!!
fr
l
l
I
s l r i
r
i
I
t00rs
T
FM seramic f ilter
{ F 1 - F 3 }
Red
. Blue
Orange
SWITCH Ass'y
GWS-224
\i!
--..--
ft-t;n
f
F
ttr (,".1' s.P
li
Y t N N
t 9 ' 5
i : l r l i l r ' r , t r
i"ful*l 1q!*l I
i i , t r t . . t t r l . l I
' h b k l s k t ?
r E
lbr th
Sr &
1B rU
!r0
J
t
!
6
&
6
b
.
.
l o o o o o
; t ; - ] ! ,
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
@
5009) in the indicator assembly
designed to match FM IF offset
combination of input signals (H
ilied to pin nos.3 & 4. Note that
ng pin nos. 3 & 4 of PD5009)
assembly (AWM-227) may thus
e circuit diagram, depending upon
ceramic filters Fl - F3 (diuided
to IF offset ualue).
rsisfors in the equalizer assembly
the program circuits employed to
(PD5O09 located in the indicator
V IF offset ualue. These jumpers
:cording to the grade of FM cera-
ilor coded into 3 ranhs) as shoutn
AWM-227
R2812.2al
RzS12.2al
Cut
Connect
Cut
Cui
Con nect
Cut
TONE CONTROL
Ass'y
GWG-r41
K T , O
@ooee
"F
V'wZ
HEADPHONES
JACK Ass'y
GWK-146
I
t
,'f ri
w s P
-sl&
t
t
?
'
i
l
t t l
l l I
i r t 1 2
xr ar 5r
t
c ' *
IF,
1
,
.' ,,f
'$
,"rtrf-*
S ' i , , o o ,
i,,t:ii
1 1
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
GwH-r3e
@6lct+g@ ,/1,
lt'in
:ffil 5'U
%jFk:il
;-.I
i e#f
tli';,}:*."
tl p ;1 1' i..idil
Ilii'F-il#il-#r
'n']" ff
d*t
-Hisrtuilri,ff#
x
IttI
POTVER AfvlP AsCY I
ffi
t B'* I* ** I'9,,**
i rdh'l I d'2"'t' tf'tlA.
1 Fl lil il tp.$
,ffiffi,:t
I l * E i i t t l i 6 Y
tttt,,.',i"%hi*i*U-
I
; l l ; '
l . r f
I I
r r
.r.,.y' lS|+lS
'*i itFlrY*#e,-
pl Tffl-rr
( D # x r , o
O + V r . , Z
R r , U
O < P , Q
POWER SUPPLY Ass'y
GWR-122 h.L
qtilL
P L 8 ( S P . A }
PL8,g
8V50mA
SWITCH Asst
GWS -223
PL1.v3
PILOT LAMP
8V 3OOmA
2y,esz{
Q1,2 zSVSre'
o3,4 2SA1O75
PL9 (SP.8)
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
sx-3E|oo
t
I
I
I
I
t
I
I
I
I
I
I
I
I
t
I
t
aT
t
6
AC r20v
6Ol-lz
ilfi-aff
E
P
AI I h"-l
\trf4
4
|
| # p,t'"i
tt {El
l i i I l
r '
ru 2Sl9O5
I I Fqee
i ln"-'-
. 1 1 * I I
,'t"" f f"
I P,,,' I I
I
\
D d ' | r ' t
$rS*, 'o"
r.7 ?:^tso
?,iinoo
2 t a l l
i'# *:n
r0r? I
I
r
!
t
'
06 SrvtN
c,r.-J
SWIICHED
'OOW MAX
UNSWITCHED
8lr"
rorAL 2oow MAx.
l1/?W',
M E X P Q N
II
4 c *
! lroo/55
:
II
I
i
t c"t
f rtoN/g
a zf n
,
t I_s_!13
E/e\_3!J ao\rr r\il
' : :"rl*4$fi,ffi+s*
i#''+:*"
.,,. *,_fm ,h!t:113"
6.1 j I
_6.,",
, ; i-il l:"i'" 6*tri
I -S,,,.,.
iig, ,
' ;ir"' i ii$:
i:t 'H.l ro
lo
I ,
lrr
torn
I --f,5-2 |
lra
I
r f'" {nn
' "i,r",fu,|fL,r'o _l ,r.",
iifr,l |
*lFE 3'il 3 3
I
I
t
; u , i l r # l ; - " 1 ? 1 ; . ' .
l-l'-{'"
+'-i?++,-
I ;,.,[,i.,
' \'
2t
-\ _
.-32.5
I t t .t,.,. €..8
'lii l'il' ,
ii;i lmfii;-- \fl-
I I
lfli
t
I
.,
$,"
t iicirr
I
iiti$ti1il***-"
I i JJ''*'i*
r*.
I or'"s'lu ''slor
I
*t' t
'lf,,,,'
lo lt
t2 !3 14
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
10.1 SCHEMATIC
DIAGRAM
_
l
-
@!@A
Lrm.nn
s
6cq
iEc 2
E C r
r a€5rsTo6:
rddd
d a, t*,
.tt r*tq
unbolha
d
I
*
cn.lft
'rr.lcl
-E,lxr
.Ertu
.L
L
x ! t s r t s . a
a a n
'.=-#.-=--r-
r
a
o'l!:6
- -
- j,r-l*-,,-s-l
-----=
TI
L
nGn
I
tddd
$ *{Y
{'r!/wh4lv}
o.hd|rilfltutdp
0f
rddd
rrbr
dr+
{ ry
tar
erdr..|4d
! volraGE, cuFF(!I
3
sid
dr*
d
60 w '
60 w
alr oiFi
(irh.r
U
r c 6 [ + r v , d d i @ r 4
v.b.n(
trm6rr*tr.ddffi
e 6 ^
m d , o r d 6 ' @ r 4
A
&6q
*rr
th
lf, {s
,dsrhn
ME.
ol .b -h!
160r ol eFd
Tk.ld._
tu
ar-!q
b !E b u- Dnrot &kr
d..@b.
s':
rq
sNrT@ t
6 -Q[f
s?
E
flNrrG
2
Ot- CF
55
*Uft
r-&d6)
a-;?
9. rruEs
o-fr
sa: Fx xuTrrc
g!-dF
$.r ' Furcfron (Frl
Q!- oFr
s6"?r F*rrox
I &t
d -Qft
s&3i
Fuf,drs
{&r,
or - Qfl
g-4:
FSCTIQ
I hmr
d -Qff
57:
tu
*-.iltuS
a!.
-7fu
sa:
*4
g:E3lg-rcrc
59'
LOw FtrEe tFHr)
A -SF
$o
Fr6HMss
QE@I -qfrn
sl
sEff€F
I A)
Q!_ qa
51?: SPEA€R r ar
a-
QfE
5i!1
SP€AX€R ISCA'
Q!-dF
5r5-? SEAX€R r9e6t
a-lff
ag
2$fr
stEo
dr
IEAUALUF A$'r Aw-227
_
or -E!
thn
n rb
Mi
@.
drge,
br
r&.tu.r
.'@n
tuv
v9
I"f:
I
|
4 a Y '
L
F E c 2
|
_
:
-
-
_
J
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
1
,6
art6
---.
(r.D F-
-:l
I
i
L-J
r,;o &4f7rn
Q&?tA t lDzrT
4u- @ *ronce
OaJh2l,i-il
8CaE
@.?t,&s
8ar@
\reM,
l,WRAJ
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
SVITBH A-'t
Gffi-Za4
l-;;*-l
|
::::
I
cr r^tsltP-A
-,,.'r
I
qlPr
I
: r o q l l
i ITJJ
i
L$r-ffir
POlf€R UP Ar'r
GAH-|39
Fmraroe
l.ey awv-oog
? I "{
,e,-,'
l
+
i :j-*_-1 FFI*-
Nffi"'
Qtq!@ 8cr7t!a
w\g
art
qoo'$
a$?ztl
s7,rc
2$&
ffi,iro
2$86
ofr,t12 ?$Eo
3l'i:lli) a"''o
ailtrr6
a@
ortila
2sa7s
Qr?r,t?z aga
Qr2tJX
zsffia^
o2ql?6
?scaE
q?7,ra
6as
q2g!15
2*aE
qs
zsctu
I ToilE CC1i{TROL As't
I
cwc-rl
I
www. xiaoyu163. com
QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
sx-3E|oo
SFf'IGR
TEilIiIAI
Gars-422
1 2
NOTE:
The indicated semicondu ctors are representative ones
only. Other alternatiue semiconductors moy be used and
are listed in the parts list.
9AiES
F
A
@'4q
Rs5fls
L
ffTJ-ir--
--l
fffiotr
l l l
e . t r l
! . .
}€TDP'OCS
#
JACX
A.dt
GTI(. K6
Gtx-t39
7>ca 1. 本站所有素材，仅限学习交流，仅展示部分内容，如需查看完整内容，请下载原文件。版权声明
2. 会员在本站下载的所有素材，只拥有使用权，著作权归原作者所有。
3. 所有素材，未经合法授权，请勿用于商业用途，会员不得以任何形式发布、传播、复制、转售该素材，否则一律封号处理。
4. 如果素材损害你的权益请联系客服QQ：77594475 处理。