先锋PIONEER MEH-P5350音响电路图
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PIONEER CORPORATION
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS SERVICE INC.
P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
PIONEER EUROPE N.V.
Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD.
253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2001
K-ZZU. MAR. 2001 Printed in Japan
ORDER NO.
CRT2654
MULTI-CD/MD CONTROL HIGH POWER MD PLAYER WITH FM/AM TUNER
MEH-P5350
ES
Service
Manual
CONTENTS
1. SAFETY INFORMATION ............................................2
2. EXPLODED VIEWS AND PARTS LIST.......................3
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM .....8
4. PCB CONNECTION DIAGRAM ................................28
5. ELECTRICAL PARTS LIST ........................................37
6. ADJUSTMENT..........................................................41
7. GENERAL INFORMATION .......................................44
7.1 DIAGNOSIS ........................................................44
7.1.1 TEST MODE ................................................44
7.1.2 DISASSEMBLY............................................48
7.1.3 CONNECTOR FUNCTION DESCRIPTION..50
7.2 PARTS .................................................................51
7.2.1 IC..................................................................51
7.2.2 DISPLAY ......................................................57
7.3 OPERATIONAL FLOW CHART...........................58
8. OPERATIONS AND SPECIFICATIONS.....................59
- This service manual should be used together with the following manual(s):
Model No.
Order No.
Mech. Module Remarks
CX-1020
CRT2653
MD-4LP
MD Mech. Module:Circuit Description, Mech.Description, Disassembly
- US and foreign patents licensed from Dolby Laboratories Licensing Corporation.
- The screw is not stopped in this product though there is a stamp of the screw stop in two places of a
full part in the figure below.
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2
MEH-P5350
1. SAFETY INFORMATION
This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair
complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.
If you are not qualified to perform the repair of this product properly and safely; you should not risk trying to do so
and refer the repair to a qualified service technician.
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3
MEH-P5350
- Owner's Manual, Installation Manual
Model
Part No.
Language
MEH-P5350/ES
CRD3422
English, Spanish
CRD3423
Portuguese(B), Arabic
CRD3424
English, Spanish, Portuguese(B), Arabic
1 Cord Assy
CDE6438
2 Accessory Assy
CEA2822
3 Screw
CBA1002
4 Handle
CNC5395
5 Bush
CNV1009
*
6 Polyethylene Bag
CEG-158
7 Polyethylene Bag
CEG-162
8-1 Owner’s Manual
CRD3422
8-2 Owner’s Manual
CRD3423
8-3 Installation Manual
CRD3424
8-4 Polyethylene Bag
CEG1116
9 Spring
CBH-865
10 Carton
CHG4353
11 Contain Box
CHL4353
12 Protector
CHP2422
13 Protector
CHP2421
14 Screw Assy
CEA2396
*
15 Polyethylene Bag
CEG-127
16 Screw
CRZ50P090FMC
17 Screw
TRZ50P080FMC
Mark No. Description
Part No.
Mark No. Description
Part No.
- PACKING SECTION PARTS LIST
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
11
8
5
4
6
3
2
7
12
13
10
1
15
9
16
17
14
NOTE:
- Parts marked by “*” are generally unavailable because they are not in our Master Spare Parts List.
- Screws adjacent to ∇ mark on the product are used for disassembly.
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4
MEH-P5350
2.2 EXTERIOR
A
B
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5
MEH-P5350
1 Screw
BMZ30P100FMC
2 Screw
BSZ26P060FMC
3 Screw
BSZ30P060FMC
4 Cord Assy
CDE6438
5 Cable
CDE6452
6 Fuse(10A)
CEK1136
*
7 Case
CNB2609
8 Holder
CNC5704
9 Holder
CNC8659
10 Cushion
CNM4870
11 Insulator
CNM6948
12 Panel
CNS6581
13 Tuner Amp Unit
CWM7778
14 Screw
ASZ26P060FMC
15 Screw
BPZ26P120FMC
16 Screw
BSZ26P160FMC
17 Pin Jack(CN351)
CKB1028
18 Plug(CN901)
CKM1330
19 Connector(CN101)
CKS3408
20 Connector(CN831)
CKS3581
21 Connector(CN991)
CKS4204
22 Antenna Jack(CN401)
CKX1056
23 Holder
CNC8615
24 Holder
CNC9472
25 Heat Sink
CNR1583
26 FM/AM Tuner Unit
CWE1563
27 Holder
CNC8815
28 Chassis Unit
CXB7119
29 Screw
BPZ20P100FMC
30 Button(BAND,ESC)
CAC6824
31 Button
CAC6825
32 Button(SRC)
CAC6851
33 Button(1-6)
CAC7114
34 Button(DISP,SCRL)
CAC7012
35 Button(FUNC,AUDIO)
CAC7119
36 Button(VOLUME)
CAC7121
37 Keyboard Unit
CWM7775
38 LCD(LCD701)
CAW1686
39 Connector(CN701)
CKS3580
40 Holder
CNC9078
41 Sheet
CNM7057
42 Cushion
CNM7393
43 Lighting Conductor
CNV6476
44 Lighting Conductor
CNV6689
45 Rubber
CNV6690
46 Connector
CNV6691
47 Grille Unit
CXB7804
48 Holder Unit
CXB7439
49 Door
CAT2125
50 Spring
CBH2329
51 MD Mechanism Module(MD-4LP)
CXK3310
52 •••••
53 Transistor(Q921,Q994)
2SD2396
54 IC(IC301)
PAL006A
55 IC(IC703)
TSOP1840SB1
- EXTERIOR SECTION PARTS LIST
Mark No. Description
Part No.
Mark No. Description
Part No.
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C
D
E
6
MEH-P5350
2.3 MD MECHANISM MODULE
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7
MEH-P5350
1 MD Unit(MD-4LP)
CWX2505
2 Connector(CN401)
CKS4055
3 Connector(CN101)
CKS4056
4 •••••
5 Screw
CBA1537
6 Screw
CBA1538
7 Screw
CBA1539
8 Screw
CBA1540
9 Screw
CBA1541
10 Screw
CBA1542
11 Washer
CBF1037
12 Washer
CBF1038
13 Washer
CBF1039
14 Spring
CBH2213
15 Spring
CBH2440
16 Spring
CBH2243
17 Spring
CBH2441
18 Spring
CBH2217
19 Spring
CBH2218
20 Spring
CBH2437
21 Spring
CBH2438
22 Spring
CBH2214
23 Spring
CBH2442
24 Spring
CBH2289
25 Spring
CBL1405
26 Spring
CBL1406
27 Spring
CBL1519
28 •••••
29 PU Unit
CGY3000
30 Shaft
CLA3489
31 Shaft
CLA3490
32 Shaft
CLA3491
33 Bracket
CNC8082
34 Arm
CNC8269
35 Arm
CNC8270
36 Cushion
CNM6301
37 Sheet
CNM6323
38 Sheet
CNM6324
*
39 Sheet
CNM6653
40 Sheet
CNM7172
41 Sheet
CNM6727
42 Sheet
CNM6728
43 PCB
CNP5335
44 Gear
CNV5616
45 Holder
CNV5623
46 Rack
CNV5624
47 Rack
CNV5625
48 Roller
CNV5626
49 Collar
CNV5627
50 Damper
CNV5629
51 Guide
CNV5630
52 Gear
CNV5631
53 Gear
CNV5633
54 Gear
CNV5634
55 Gear
CNV5635
56 Gear
CNV5636
57 Guide
CNV5746
58 Lever
CNV5747
59 Lever
CNV5748
60 Gear
CNV5834
61 Gear
CNV5837
62 Gear
CNV5838
63 Gear
CNV5839
64 Gear
CNV5913
65 Composite PCB
CNX3127
66 Chassis Unit
CXB4399
67 Spring Unit
CXB4047
68 Holder Unit
CXB6415
69 Bracket Unit
CXB4049
70 Frame Unit
CXB4401
71 Bracket Unit
CXB4051
72 Bracket Unit
CXB6407
73 Motor Unit(-C)(M1)(CRG) CXB4054
74 Screw
IMS20P025FMC
75 Screw Unit(-C)
CXB4055
76 Motor Unit(-A)(M2)(Loading) CXB7603
77 Motor(M3)(SPDL)
CXM1181
78 Screw
JGZ14P018FZK
79 Washer
WB16FMC
80 Washer
YE12FUC
81 Connector(CN301)
CKS4060
82 Guide
CNC9597
83 •••••
84 Lever
CNV6670
85 Spring
CBH2477
86 Arm
CNV6541
87 Spring
CBH2443
- MD MECHANISM SECTION PARTS LIST
Mark No. Description
Part No.
Mark No. Description
Part No.
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MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
ANT1 TV
ANT2 TV
RF TV
IC 3
BR9010FV
AM 2ND IF 450kHz
ANTENNA
CN401
27
28
FM FRONT END
Q3
Q201 Q204
AM RF
FM/AM 1ST IF 10.7MHz
T51 Q51 CF51
CF52 CF53
MIXER.IF AMP DET
IC 1
PML002A
38
39
42
44
46
63
25
24
32
DI/DO
19
46
6
21
18
LDET
COMP
34 33 41 44 11 12 13
69
70
54
78
65
71
75
74
61
57
55
45
33
35
22
22
25
10 14
12 15 16 8 13 2
3
4
CF202
VCC
LOCL
VDD
Q401
VCC
VDD
DI/DO
CE2
CK
CE1
SDBW
SL
FMSD
TUNPCE2
TUNPCK
SL
SD
TUNPDIO
NL1
NL2
EEPROM
5
6
4
3
IC 2 PM4008A
FM MPX
IP-BUS
8
5
1
7
11
ASENBO
TX
RX
IPPW
1
8
2
5
6
IP-BUS DRIVER
IC 101
HA12187FP
B–
B+
BL+
BL–
SD
SL
TUNPCE
TUNPCK
TUNPCE2
TUNPDO
TUNPDI
LOCL
ASENBO
TX
RX
IPPW
IN2_L
IN4+_L
IN4–_L
IN3_L
38
74
99
97
52
98
94
31
25
86
85
24
40
42
44
41
BSCK
65
BSO
67
BRST
68
BRXEN
63
BSRQ
64
X1
16
X2
15
SYSTEM
CONTROLLER
IC 601(1/2)
PE5213A
DA
ELECT
SOUR
SYSTEM
CONTROLLER
IC 601(2/2)
PE5213A
SY
L
S
X601
B.U
Q993
RESET
BSI
66
VDSEL
7
TUNPCE
CN101
32
Q202
Q991
Q994
M
M
M
LASER
DIODE
MONITOR
DIODE
FOCUS ACT.
LOADING
MOTOR
DISC SW
LOAD SW
HOME SW
CLMP SW
SPDL
MOTOR
EJCT
SW
CRG
MOTOR
TRACKING ACT.
LD+
MON
F+
T+
LO–
LO+
SO–
SO+
EJECT
DISC
LOAD
HOME
CLMP
14
19
1,2
3
10
12
11
9
10
14
13
15
17
3
2
34
33
XOUT
AUX2
AUX1
XIN
ESW
DISC
LSW
HOME
CSW
7
25
15
1
5
3
93
20
AOOTL
28
XRST
FEA
AUX
96
VREF
86
VDDSW
75
MUTE
95
VDSENSE
44
VDON
34
BSI
33
BSO
37
bsrq
17
brst
35
BSCK
38
BRXEN
10
reset
MDVD
VDCONT
MDVD
BDAT
BRQ
BRST
BCK
BRX
BDATA
BRXEN
MRST
21
84
10
11
9
7
6
5
4
3
1
13
10
9
7
6
5
4
3
1
13
14
19
1,2
3
D SW1 PCB
C MD UNIT
E
SW2 PCB
PU UNIT
CN101
IC 101
CXA2523AR
IC 401
BA5985FM
IC 201
CXD2667R
CN401
Q101
Q102
UMD2N
IC 102
NJM2115V
IC 304
TC7WH34FU
IC 301
PD5655A
IC 302, 303
TC7WT125FU
X201
11
81
82
79
83
80
13
LDCNT
43
X301
Q301
Q602
Q601
VDD
3VD
PVD
1
3
IC 701
BA033FP
5
11
4
3
7
9
6
8
10
5
11
4
3
PVD
PVD
2
1
2
1
MDL
16
16
7
9
6
8
10
CN301
CN991
HOLOGRAM
UNIT
RF AMP
DIGITAL
SERVO
RTRAC
5ch Pow-Driver
MD SYSTEM CONTROLLER
D RAM
3V Regulator
A TUNER AMP UNIT
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM
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9
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
IC 703
TSOP1840SB1
REMOTE CONTROL
SENSOR
OPT IN
RESET
REM
S0
S1
KEY CONTROLLER,
LCD DRIVER
IC701
PD2068A
ILB
SW5V
5
3
8
4
4
6
1
5
KEY MATRIX
1
10
E
K
E2
O
I
O
SYSTEM
CONTROLLER
IC 601(1/2)
PE5213A
Q912
B.U
VDD1
DALMON
Q959
B.U
BUP1
GND1
RL–
RL+
FL–
FL+
B.REM
ILL
ACC
TEL
MUTE
TEL1
2
1
10
12
9
11
5
6
4
7
ELECTRICAL VOLUME/
SOURCE SELECTOR
IC 151
PML008A
SYSTEM
CONTROLLER
IC 601(2/2)
PE5213A
asens
92
bsens
93
isens
asens
bsens
isens
4
TELIN
27
SYSPWR
21
MUTE
28
KYDT
95
DPDT
96
RESET
11
LCDPW
23
SWVDD
1
ILMPW
20
FL
10
RL
11
POWER AMP
IC 301
PAL005A
11
15
22
4
25
21
23
5
3
FL
MUTE
STBY
B.REM
RL
B.U
TELIN
bsens
asens
ISENS
Q951
Q931
Q932
Q301 MUTE
Q351
CN351
REAR
L CH
4
3
CN701
CN831
ILB
LCD701
2
3
X701
8
9
Q352
Q924
Q923
Q921
Q932
B.U
VCC
SYSPW
Q811
Q812
Q821
Q822
B.U
Q801
VDD
B.U
RESET
IC 961
S–80735ANDZI
VDD
1
2
RESET
SYSPW
TELIN
SYSPW
CN901
26
VCC
LCD
BACK
LIGHT
Q701
DIM
7
2
7
BACKUP
GND
RL–
RL+
FL–
FL+
B.REM
ILL
ACC
IC 702
S-80734ANDYI
RESET
B KEYBOARD UNIT
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3.2 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)
Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS
LIST”.
A-a
A-b
A-a
A-a
A-b
A-b
A-b
A-b
A-a
A-a
Large size
SCH diagram
Guide page
Detailed page
10
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
A-a
MD:+1dBs
IP-BUS:+2.2dBs
FM:-19.5dBs
AM:-30.0dBs
C MD UNIT
CN301
FM/AM TUNER UNIT
IP-BUS
The >
the im
Theref
identic
S
N
d
NOTE :
S
N
d
A
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11
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
A-b
L151
FM:+0.6dBs
AM: -9.9dBs
MD:+5.1dBs
IP-BUS:+5.3dBs
FM:+4.75dBs
AM: -5.75dBs
MD:+19.25dBs
IP-BUS:+9.45dBs
FM:+31.6dBs
AM: -21.1dBs
MD:+36.1dBs
IP-BUS:+36.3dBs
FM:+5.6dBs
AM: -4.9dBs
MD:+10.1dBs
IP-BUS:+10.3dBs
FM:+5.6dBs
AM: -4.9dBs
MD:+10.1dBs
IP-BUS:+10.3dBs
A
TUNER AMP UNIT
B KEYBOARD UNIT
CN701
CEK1136
10A
FUSE
>
Decimal points for resistor
and capacitor fixed values
are expressed as :
2.2 2R2
0.022 R022
←
←
> mark found on some component parts indicates
mportance of the safety factor of the part.
efore, when replacing, be sure to use parts of
ical designation.
Symbol indicates a resistor.
No differentiation is made between chip resistors and
discrete resistors.
:
Symbol indicates a capacitor.
No differentiation is made between chip capacitors and
discrete capacitors.
600µH
A
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12
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
MD:+1dBs
IP-BUS:+2.2dBs
FM:-19.5dBs
AM:-30.0dBs
C MD UNIT
CN301
FM/AM TUNER UNIT
IP-BUS
A-a
A-a A-b
1
2
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13
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
The > mark foun
the importance of
Therefore, when r
identical designat
Symbol indic
No differenti
discrete resis
NOTE :
Symbol indic
No differenti
discrete capa
A-a A-b
A-a
3
4
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0
5
1
5
1
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14
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
L151
FM:+0.6dBs
AM: -9.9dBs
MD:+5.1dBs
IP-BUS:+5.3dBs
FM:+4.75dBs
AM: -5.75dBs
MD:+19.25dBs
IP-BUS:+9.45dBs
FM:+5.6dBs
AM: -4.9dBs
MD:+10.1dBs
IP-BUS:+10.3dBs
FM:+5.6dBs
AM: -4.9dBs
MD:+10.1dBs
IP-BUS:+10.3dBs
A
TUNER AMP UNIT
CEK1136
10A
FUSE
A-a A-b
A-b
1
2
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8
0
5
1
5
1
3
6
7
3
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15
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
FM:+31.6dBs
AM: -21.1dBs
MD:+36.1dBs
IP-BUS:+36.3dBs
B KEYBOARD UNIT
CN701
CEK1136
10A
FUSE
>
Decimal points for resistor
and capacitor fixed values
are expressed as :
2.2 2R2
0.022 R022
←
←
ark found on some component parts indicates
tance of the safety factor of the part.
, when replacing, be sure to use parts of
designation.
bol indicates a resistor.
ifferentiation is made between chip resistors and
ete resistors.
bol indicates a capacitor.
ifferentiation is made between chip capacitors and
ete capacitors.
600µH
A-b
A-a A-b
3
4
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5
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KEY MICROCOMPUTER
RESET
560
R47
2R7K
16
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
3.3 KEYBOARD UNIT
B www. xiaoyu163. com
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1
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B
LCD BACK LIGTH
B
A
KEYBOARD UNIT
CN831
17
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
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5
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18
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
3.4 MD MECHANISM MODULE(GUIDE PAGE)
C
M1
D
FOCUS SERVO LINE
TRACKING SERVO LINE
CARRIAGE SERVO LINE
SPINDLE SERVO LINE
F
T
C
S
S
S
C
T
T
F
F
C
C
S
S
T
T
F
F
S
S
C
C
C
C
S
S
F
T
T
F
1
(
0
4
6
5
#
@
)
fi
‹
fl
¤
›
⁄
·
*
RF AMP
&
5ch Pow-Driver
C-a
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19
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
CK SELECT
A CN991
MD UNIT
C
MD SYSTEM
CONTROLLER
3-5V
LEVEL SHIFT
S
S
C
C
F
F
T
T
2
3
7
$
8
9
°
%
^
‡
3V Reg
DIGITAL SERVO
ATRAC,ATRAC3 DECODER
!
C
C-b
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20
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
C-a
FOCUS SERVO LINE
TRACKING SERVO LINE
CARRIAGE SERVO LINE
SPINDLE SERVO LINE
F
T
C
S
S
S
C
C
F
T
T
F
1
·
*
RF AMP
&
C-a C-b
1
2
3
4
5
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5
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21
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
C-a
M1
D
T
T
F
F
C
C
S
S
T
T
F
F
S
S
C
C
C
C
S
S
(
0
4
6
5
#
@
)
fi
‹
fl
¤
›
⁄
5ch Pow-Driver
C-a C-b
6
7
8
9
10
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5
1
5
1
3
6
7
3
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22
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
MD UNIT
C
F
F
T
T
2
3
7
$
8
9
°
%
^
‡
3V Reg
DIGITAL SERVO
ATRAC,ATRAC3 DECODER
!
C-a C-b
1
2
3
4
5
C-bwww. xiaoyu163. com
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5
1
5
1
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23
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
CK SELECT
A CN991
MD SYSTEM
CONTROLLER
3-5V
LEVEL SHIFT
C-a C-b
C-b
6
7
8
9
10
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5
1
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24
MEH-P5350
1 RF
0.4V/div. 0.5µs/div.
Normal mode: Play
1 CH1: RF
0.5V/div.
2 CH2: MNT3
2V/div.
(OFTRK)
Test mode: Tracking open
0.5ms/div.
1 CH1: RF
0.5V/div.
3 CH2: MNT2
2V/div.
(DFCT)
Test mode: The defect part passes 800µm
0.5ms/div.
4 CH1: FIN
0.2mV/div.
5 CH2: FOP
1V/div.
6 CH2: FOM
1V/div.
Test mode: No disc, Focus close
0.5s/div.
4 CH1: FIN
0.5V/div.
7 CH2: MNT0
2V/div.
(FOK)
Normal mode: Focus close
0.2s/div.
8 CH1: FEY
0.2V/div.
9 CH2: TEY
1V/div.
Normal mode: Focus close
2ms/div.
9 CH1: TEY
1V/div.
0 CH2: TIN
0.1V/div.
Test mode: 32 tracks jump (REV)
0.5ms/div.
9 CH1: TEY
0.5V/div.
0 CH2: TIN
0.2V/div.
Test mode: Single jump (REV)
0.5ms/div.
9 CH1: TEY
1V/div.
0 CH2: TIN
0.2V/div.
! CH3: CIN
0.5V/div.
Test mode: Fine jump (REV)
5ms/div.
8 CH1: FEY
0.2V/div.
4 CH2: FIN
0.2V/div.
Normal mode: Play
5ms/div.
4 CH1: FIN
0.1V/div.
@ CH2: SIN
0.5V/div.
Normal mode: Play
0.5s/div.
4 CH1: FIN
0.1V/div.
@ CH2: SIN
0.5V/div.
Normal mode: Play(Recordable MD)
0.5s/div.
- Waveforms
Notes:
1. Circled figures represent the measuring points in the circuit diagram.
2. Reference voltage VC: 1.65V < ·VC >
3. Premastered MD, Make measurements using the MMD110.
Nonetheless, waveforms indicated as “Recordable MD” should be
measured using the MMD212.
4. Use TMD325W as the Defect MD.
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25
MEH-P5350
9 CH1: TEY
0.5V/div.
0 CH2: TIN
0.1V/div.
Normal mode: Play
9 CH1: TEY
0.5V/div.
0 CH2: TIN
0.1V/div.
Normal mode: Play
2ms/div.
! CH1: SE
0.1V/div.
@ CH2: CIN
0.2V/div.
Normal mode: Play
# CH1: SIN
0.1V/div.
9 CH2: TEY
0.5V/div.
Normal mode: Play
# CH1: SIN
0.5V/div.
9 CH2: TEY
0.5V/div.
Normal mode: Long search
(Last track->1st track)
9 CH1: TEY
1V/div.
$ CH2: ABCD
0.2V/div.
Test mode: Focus close,Tracking open
2ms/div.
9 CH1: TEY
0.5V/div.
8 CH2: FEY
0.5V/div.
Normal mode: AGC after focus close
(Recordable MD)
0.2s/div.
50ms/div.
*1 Use the AGND pin for grounding. < ‡ GND >
*2 Use the GND pin for grounding. < ° GND >
Due to dispersion in electrical and mechanical characteristics of the MD
MECH module, observed waveforms for TEY, TIN, FEY and FIN signals
might be a little different from those shown below.
50ms/div.
500ms/div.
50ms/div.
% CH1: ROUT 1V/div.
^ CH2: LOUT 1V/div.
Normal mode: Play(1kHz 0dB)
0.5ms/div.
8 CH1: FEY
0.2V/div.
4 CH2: FIN
0.2V/div.
Test mode: During AGC
1ms/div.
9 CH1: TEY
0.5V/div.
0 CH2: TIN
0.1V/div.
Test mode: During AGC
1ms/div.
0 CH1: TIN
0.1V/div.
3 CH2: MNT2 2V/div.
(DFCT)
Test mode: The defect part passes 800µm
0.5ms/div.
*1
9 CH1: TEY
0.5V/div.
@ CH2: CIN
0.2V/div.
Test mode: 32 tracks jump (FWD)
1ms/div.
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26
MEH-P5350
( CH1: MLOAD 5V/div.
) CH2: MEJCT
5V/div.
⁄ CH3: CLMP
5V/div.
¤ CH4: LOP
5V/div.
Normal mode: Load (Recordable MD)
0.2s/div.
*1 Cautions on measuring
While measuring, keep the leads from the measuring terminals (ADFM, ADFG and GND on the MD CORE unit) ,
which is connected to the probe of an oscilloscope, apart from each other.
*2 Use the GND pin for grounding. < ° GND >
*2
( CH1: MLOAD 5V/div.
) CH2: MEJCT
5V/div.
‹ CH3: EJCT
5V/div.
› CH4: LOM
5V/div.
Normal mode: Eject
0.2s/div.
*2
( CH1: MLOAD 5V/div.
@ CH2: CIN
1V/div.
fi CH3: HOME
5V/div.
fl CH4: DISC
5V/div.
Normal mode: Load
0.2s/div.
*2
( CH1: MLOAD 5V/div.
@ CH2: CIN
1V/div.
fi CH3: HOME
5V/div.
fl CH4: DISC
5V/div.
Normal mode: Load (Recordable MD)
0.2s/div.
*2
& CH1: ADFG 2V/div.
* CH2: ADFM 0.5V/div.
Test mode: Play (Recordable MD)
50µs/div.
*1
*2
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27
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
1 2
HOME
GND
3
LOAD
4 5
DISC
EJCT
6
SO+
7 8
SO-
LO+
9
LO+
10 11
LO-
LO-
12
GND
13
CLMP
M
M
S402
CSN1052
HOME SW
S405
CSN1052
LOAD SW
S404
CSN1042
DISC SW
S401
CSN1055
CLMP SW
S403
CSN1053
EJCT SW
LOADING
MOTOR
M2
CXB7603
SPDL
MOTOR
M3
CXM1181
E
D
E SW2 PCB
D SW1 PCB
PCB UNIT
Consists of
SW1 PCB
SW2 PCB
C CN401
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28
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
4. PCB CONNECTION DIAGRAM
4.1 TUNER AMP UNIT
NOTE FOR PCB DIAGRAMS
1. The parts mounted on this PCB
include all necessary parts for
several destination.
For further information for
respective destinations, be sure
to check with the schematic dia-
gram.
2. Viewpoint of PCB diagrams
A
A
Capacitor
Connector
P.C.Board
Chip Part
SIDE A
SIDE B
TUNER AMP UNIT
B CN701
CORD ASSY
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29
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
A
SIDE A
IC,Q
FRONT
IP-BUS
REAR OUT
ANTENNA
FM/AM TUNER
UNIT
C CN301
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30
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
A
A
TUNER AMP UNIT
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31
MEH-P5350
5
6
7
8
5
6
7
8
D
C
B
A
A
SIDE B
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1
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32
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
4.2 KEYBOARD UNIT
DISPLAY
+
+
-
-
EQ
SFEQ
SRC
SRC
1
2
3
4
5
6
CLOCK
BAND
EJECT
FUNCTION
AUDIO
B
B
SIDE A
KEYBOARD UNIT
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33
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
A CN831
B
B
SIDE B
KEYBOARD UNIT
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0
5
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3
Q
Q
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IC, Q
E
E
1
CN991
A
34
MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
4.3 MD MECHANISM MODULE
MD UNIT
C
C
PU UNIT
SIDE A
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IC, Q
D
35
MEH-P5350
D
C
B
A
1
2
3
4
1
2
3
4
C
MD UNIT
C
SIDE B
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MEH-P5350
1
2
3
4
1
2
3
4
D
C
B
A
S403
EJCT
SW
S405
LOAD SW
S404
DISC
SW
SW2 PCB
SW1 PCB
M2
LOADING
MOTOR
M3
SPINDLE
MOTOR
E
D
D
CN401
S401
CLMP
SW
E
E
S402
HOME
SW
C
D
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MEH-P5350
5. ELECTRICAL PARTS LIST
NOTES:
- Parts whose parts numbers are omitted are subject to being not supplied.
- The part numbers shown below indicate chip components.
Chip Resistor
RS1/_S___J,RS1/__S___J
Chip Capacitor (except for CQS.....)
CKS....., CCS....., CSZS.....
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
Unit Number : CWM7778
Unit Name
: Tuner Amp Unit
MISCELLANEOUS
IC
101
IC
HA12187FP
IC
151
IC
PML008A
IC
301
IC
PAL006A
IC
601
IC
PE5213A
IC
961
IC
S-80735ANDZI
Q
101
Transistor
2SA1037K
Q
102
Transistor
DTC114EK
Q
301
Transistor
DTC124EK
Q
351
Transistor
IMH3A
Q
352
Transistor
DTA124EK
Q
401
Transistor
2SC2412K
Q
601
Transistor
DTA114EK
Q
801
Transistor
2SA1037K
Q
811
Transistor
2SC1740S
Q
812
Transistor
IMD2A
Q
821
Transistor
2SB1238
Q
822
Transistor
DTC114EK
Q
911
Transistor
2SD1760F5
Q
912
Transistor
IMD2A
Q
921
Transistor
2SD2396
Q
923
Transistor
2SB1238
Q
924
Transistor
DTC114EK
Q
931
Transistor
IMX1
Q
932
Transistor
IMX1
Q
951
Transistor
2SA1037K
Q
991
Transistor
IMD2A
Q
993
Transistor
DTC114EK
Q
994
Transistor
2SD2396
D
451
Diode
DAN202U
D
453
Diode
HZS9L(A2)
D
811
Diode
HZS11L(B3)
D
901
Diode
MPG06G-6415G50
D
902
Diode
MPG06G-6415G50
D
911
Diode
MPG06G-6415G50
D
912
Diode
HZS6L(B2)
D
921
Diode
HZS9L(B3)
D
931
Diode
HZS7L(C3)
D
932
Diode
HZS7L(A1)
D
951
Diode
DAN202U
D
971
Diode
MPG06G-6415G50
D
972
Diode
MPG06G-6415G50
D
991
Diode
HZS9L(B1)
D
992
Diode
HZS6L(B2)
D
993
Diode
RB160L-40
ZNR 401
DSP-201M-A21F
L
101
Ferri-Inductor
LAU2R2K
L
401
Ferri-Inductor
LAU2R2K
L
402
Ferri-Inductor
LAU1R0M
L
403
Ferri-Inductor
LAU4R7K
L
601
Ferri-Inductor
LAU2R2K
L
651
Inductor
LAU100K
L
801
Ferri-Inductor
LAU2R2K
L
901
Choke Coil 600µH
CTH1221
L
951
Ferri-Inductor
LAU2R2K
X
601
Radiator 12.58291MHz
CSS1402
SP
621
Buzzer
CPV1050
FM/AM Tuner Unit
CWE1563
RESISTORS
R
101
RS1/16S222J
R
102
RD1/4PU472J
R
103
RS1/16S223J
R
104
RS1/16S102J
R
105
RS1/16S102J
R
106
RS1/16S473J
R
107
RS1/16S473J
R
108
RS1/16S101J
R
109
RS1/16S470J
R
110
RS1/16S101J
R
111
RS1/16S102J
R
112
RS1/16S150J
R
113
RS1/16S181J
R
114
RS1/16S181J
R
115
RS1/16S223J
R
116
RS1/16S223J
R
117
RS1/16S102J
R
118
RS1/16S102J
R
151
RAB4C102J
R
153
RS1/16S101J
R
154
RS1/16S101J
R
155
RS1/16S101J
R
156
RS1/16S101J
R
301
RS1/16S103J
R
302
RS1/16S103J
R
303
RS1/16S331J
R
351
RS1/16S821J
R
352
RS1/16S821J
R
353
RS1/16S223J
R
354
RS1/16S223J
R
401
RS1/16S473J
R
402
RS1/16S473J
R
403
RS1/16S681J
R
404
RS1/16S681J
R
405
RS1/16S681J
R
406
RS1/16S103J
R
407
RS1/16S681J
R
408
RS1/16S681J
R
409
RS1/16S681J
R
410
RS1/16S473J
R
411
RS1/16S472J
R
412
RS1/16S473J
R
413
RS1/16S393J
R
414
RS1/16S473J
R
415
RS1/16S473J
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
A
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0
5
1
5
1
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7
3
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MEH-P5350
R
416
RS1/16S222J
R
417
RS1/16S222J
R
421
RS1/16S272J
R
422
RS1/16S272J
R
423
RS1/16S182J
R
424
RS1/16S182J
R
425
RS1/16S153J
R
426
RS1/16S153J
R
452
RS1/16S103J
R
453
RS1/16S473J
R
455
RS1/16S222J
R
601
RS1/16S473J
R
602
RS1/16S102J
R
603
RS1/16S0R0J
R
604
RS1/16S473J
R
605
RS1/16S104J
R
606
RAB4C473J
R
607
RAB4C221J
R
608
RS1/16S221J
R
609
RS1/16S473J
R
612
RS1/16S104J
R
621
RS1/16S102J
R
652
RS1/16S221J
R
654
RS1/16S221J
R
656
RS1/16S102J
R
801
RS1/16S223J
R
802
RS1/16S332J
R
811
RD1/4PU471J
R
821
RS1/16S1R0J
R
822
RD1/4PU332J
R
823
RS1/16S223J
R
832
RS1/16S222J
R
834
RS1/16S222J
R
912
RD1/4PU223J
R
913
RD1/4PU222J
R
922
RD1/4PU102J
R
923
RD1/4PU332J
R
924
RS1/16S223J
R
931
RS1/16S104J
R
932
RS1/16S473J
R
933
RS1/16S223J
R
934
RS1/16S473J
R
935
RD1/4PU472J
R
936
RD1/4PU102J
R
937
RS1/16S473J
R
938
RS1/16S103J
R
939
RD1/4PU102J
R
940
RS1/16S104J
R
941
RS1/16S104J
R
942
RS1/16S104J
R
951
RS1/16S473J
R
952
RS1/16S102J
R
953
RS1/16S472J
R
954
RS1/16S472J
R
955
RD1/4PU153J
R
961
RS1/16S822J
R
991
RD1/4PU471J
R
992
RD1/4PU221J
CAPACITORS
C
101
CKSRYB104K16
C
102
CKSRYB102K50
C
103
CEJQ1R0M50
C
104
CEJQ1R0M50
C
105
CEJQ1R0M50
C
106
CEJQ1R0M50
C
151
CKSRYB104K16
C
152
CEJQ470M10
C
153
CEJQNP4R7M16
C
154
CEJQNP4R7M16
C
157
CEJQNP4R7M16
C
158
CEJQNP4R7M16
C
161
CEJQNP4R7M16
C
162
CEJQNP4R7M16
C
165
CEJQ100M16
C
301
CFTNA224J50
C
302
CFTNA224J50
C
303
CFTNA224J50
C
304
CFTNA224J50
C
305
CEJQ330M10
C
306
CFTNA105J50
C
307
CEJQ100M16
C
308
CKSRYB104K16
C
309
4700µF/16V
CCH1362
C
351
CEJQ4R7M35
C
352
CEJQ4R7M35
C
401
CKSRYB473K16
C
402
CEJQ101M6R3
C
404
CKSRYB472K50
C
405
CKSRYB103K25
C
406
CEJQ220M10
C
407
CKSQYB103K50
C
409
CKSRYB223K25
C
410
CKSRYB223K25
C
421
CKSRYB183K25
C
422
CKSRYB183K25
C
425
CEJQR22M50
C
426
CEJQR22M50
C
602
CKSRYB102K50
C
603
CEJQ4R7M35
C
604
CCSRCH180J50
C
605
CCSRCH180J50
C
606
CKSRYB104K16
C
618
CCSRCH101J50
C
653
CEJQ1R0M50
C
654
CEJQ1R0M50
C
801
CCSRCH101J50
C
802
CKSRYB104K16
C
811
CKSRYB103K25
C
911
CEJQ470M10
C
912
CKSRYB103K25
C
913
470µF/16V
CCH1183
C
921
CEJQ101M10
C
922
CKSRYB473K16
C
923
CKSRYB103K25
C
924
CEJQ100M16
C
931
CEJQ100M16
C
961
CEJQ2R2M50
C
991
CKSRYB473K16
C
992
CKSRYB103K25
C
993
CEJQ101M10
C
994
1000µF/10V
CCH1184
Unit Number : CWX2505
Unit Name
: MD Unit(MD-4LP)
MISCELLANEOUS
IC
101
IC
CXA2523AR
IC
102
IC
NJM2115V
IC
201
IC
CXD2667R
IC
301
IC
PD5655A
IC
302
IC
TC7WT125FU
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
C
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9
2
8
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4
2
9
8
TEL 13942296513
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9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
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39
MEH-P5350
IC
303
IC
TC7WT125FU
IC
304
IC
TC7WH34FU
IC
401
IC
BA5985FM
IC
701
IC
BA033FP
Q
101
Transistor
2SB1132
Q
102
Transistor
UMD2N
Q
301
Transistor
DTA144EU
Q
601
Transistor
FMG13
Q
602
Transistor
IMD3A
D
601
Chip Diode
MA151WA
TH
301
Thermistor
CCX1037
X
201
Ceramic Resonator 22.579MHz
CSS1545
X
301
Ceramic Resonator 10.00MHz
CSS1476
RESISTORS
R
101
RS1/16S473J
R
102
RS1/16S681J
R
103
RS1/10S100J
R
104
RS1/16S681J
R
105
RS1/16S474J
R
106
RS1/16S682J
R
107
RS1/16S133J
R
108
RS1/16S913J
R
109
RS1/16S432J
R
110
RS1/16S563J
R
111
RS1/16S133J
R
112
RS1/16S133J
R
113
RS1/16S103J
R
114
RS1/16S103J
R
115
RS1/16S242J
R
116
RS1/16S103J
R
117
RS1/16S242J
R
118
RS1/16S103J
R
119
RS1/16S473J
R
120
RS1/16S561J
R
121
RS1/16S561J
R
201
RS1/16S151J
R
202
RS1/16S104J
R
203
RS1/16S103J
R
204
RS1/16S152J
R
205
RAB4C123J
R
206
RAB4C104J
R
207
RS1/16S101J
R
208
RS1/16S101J
R
209
RS1/16S684J
R
210
RN1/16SE1002D
R
211
RN1/16SE1002D
R
212
RS1/16S105J
R
213
RS1/16S102J
R
214
RS1/16S332J
R
215
RS1/16S123J
R
216
RS1/16S221J
R
217
RS1/16S123J
R
218
RS1/16S123J
R
219
RS1/16S123J
R
301
RS1/16S221J
R
302
RS1/16S221J
R
303
RS1/16S221J
R
304
RS1/16S104J
R
305
RN1/16SE1002D
R
308
RS1/16S104J
R
309
RAB4C104J
R
310
RS1/16S104J
R
311
RS1/16S473J
R
312
RAB4C681J
R
313
RAB4C681J
R
314
RAB4C104J
R
315
RS1/16S393J
R
316
RS1/16S104J
R
317
RS1/16S683J
R
318
RS1/16S0R0J
R
319
RS1/16S0R0J
R
401
RS1/16S221J
R
402
RS1/16S222J
R
403
RS1/16S333J
R
404
RS1/16S333J
R
405
RS1/16S222J
R
406
RS1/16S0R0J
R
407
RS1/16S121J
R
408
RS1/16S332J
R
409
RS1/16S183J
R
410
RS1/16S0R0J
R
411
RS1/16S0R0J
R
412
RS1/16S121J
R
413
RS1/16S332J
R
414
RS1/16S183J
R
415
RS1/16S0R0J
R
416
RS1/16S221J
R
417
RS1/16S152J
R
418
RS1/16S183J
R
419
RS1/16S152J
R
420
RS1/16S183J
R
421
RS1/16S512J
R
422
RS1/16S183J
R
423
RS1/16S512J
R
424
RS1/16S183J
R
425
RS1/16S221J
R
603
RS1/16S223J
R
604
RS1/16S223J
CAPACITORS
C
101
CEVL100M16
C
102
CKSRYB223K25
C
103
CEVL100M16
C
104
CKSRYB223K25
C
105
CKSRYB104K16
C
106
CEVL101M6R3
C
107
CCSRCH220J50
C
108
CKSRYB102K50
C
109
CKSRYB103K50
C
110
CKSRYB224K16
C
111
CKSRYB473K25
C
112
CKSRYB223K25
C
113
CKSRYB472K50
C
114
CKSRYB104K16
C
115
CKSRYB102K50
C
116
CKSRYB473K25
C
117
CKSRYB102K50
C
118
CKSRYB105K10
C
119
CKSRYB472K50
C
120
CKSRYB104K16
C
121
CKSRYB105K10
C
122
CKSRYB103K50
C
201
CKSRYB103K50
C
202
CKSRYB474K10
C
203
CKSRYB104K16
C
204
CKSRYB222K50
C
205
CKSRYB222K50
C
206
CKSRYB103K50
C
207
CKSRYB104K16
C
208
CKSRYB474K10
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
www. xiaoyu163. com
QQ 376315150
9
9
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8
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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
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40
MEH-P5350
C
209
CKSRYB104K16
C
210
CKSRYB471K50
C
211
CKSRYB104K16
C
212
CKSRYB104K16
C
213
CKSRYB104K16
C
214
CKSRYB104K16
C
215
CKSRYB104K16
C
216
CKSRYB102K50
C
217
CKSRYB104K16
C
218
CKSRYB105K10
C
219
CKSRYB105K10
C
220
CKSRYB102K50
C
221
CKSRYB105K10
C
222
CKSRYB104K16
C
223
CKSRYB104K16
C
224
CKSRYB104K16
C
225
22µF/6.3V
CCH1350
C
301
CKSRYB103K50
C
302
CKSRYB103K50
C
303
CKSRYB103K50
C
306
CKSRYB104K16
C
307
CKSRYB104K16
C
308
CKSRYB102K50
C
309
CKSRYB102K50
C
310
CKSRYB104K16
C
311
CKSRYB221K50
C
312
CKSRYB102K50
C
401
CKSRYB471K50
C
402
CKSRYB471K50
C
403
CKSRYB224K16
C
404
CKSRYB103K50
C
405
CKSRYB224K16
C
406
CKSRYB103K50
C
407
CCSRCH151J50
C
408
CCSRCH151J50
C
409
CCSRCH151J50
C
410
CCSRCH151J50
C
411
CEVL470M16
C
412
CKSRYB105K10
C
601
CEVL4R7M35
C
602
CEVL4R7M35
C
701
CKSRYB224K16
C
702
CEVL100M16
C
703
CKSRYB104K16
C
704
22µF/6.3V
CCH1350
C
705
CEVL101M6R3
Unit Number : CWM7775
Unit Name
: Keyboard Unit
MISCELLANEOUS
IC
701
IC
PD2068A
IC
702
IC
S-80734ANDYI
IC
703
IC
TSOP1840SB1
Q
701
Transistor
2SC2412K
D
701
LED
NSSW440-9159
D
702
LED
NSSW440-9159
D
703
LED
SML210PT
D
704
LED
SML210PT
D
705
LED
SML210PT
D
706
LED
SML210PT
D
707
LED
SML210PT
D
708
LED
SML210PT
D
709
LED
SML210PT
D
710
LED
SML210PT
X
701
Radiator
CSS1559
IL
701
Lamp 40mA 14V
CEL1687
IL
702
Lamp 40mA 14V
CEL1687
LCD 701
LCD
CAW1686
RESISTORS
R
701
RS1/16S222J
R
702
RS1/16S222J
R
703
RS1/16S2R2J
R
704
RS1/16S121J
R
706
RS1/16S5600D
R
707
RS1/16S2701D
R
708
RS1/16S822J
R
709
RS1/16S121J
R
710
RS1/16S121J
R
711
RS1/16S101J
R
712
RS1/16S121J
R
713
RS1/16S101J
R
714
RS1/16S221J
R
715
RS1/16S472J
R
719
RS1/16S101J
R
720
RS1/16S121J
R
721
RS1/16S101J
R
732
RS1/16S473J
R
733
RAB4C104J
CAPACITORS
C
701
CEV2R2M50
C
702
CKSRYB474K10
C
703
CKSRYB104K16
C
704
CKSRYB104K16
C
705
CKSRYB104K16
C
706
CKSRYB104K16
C
707
CKSRYB104K16
C
708
CKSRYB104K16
C
709
CKSRYB104K16
C
710
CKSRYB104K16
Unit Number :
Unit Name
: PCB Unit
S
401
Spring Switch(CLMP SW)
CSN1055
S
402
Spring Switch(HOME SW)
CSN1052
S
403
Spring Switch(EJCT SW)
CSN1053
S
404
Spring Switch(DISC SW)
CSN1042
S
405
Spring Switch(LOAD SW)
CSN1052
Miscellaneous Parts List
PU Unit
CGY3000
M
1
Motor Unit(-C)(CRG)
CXB4054
M
2
Motor Unit(-B)(Loading)
CXB7603
M
3
Motor(SPDL)
CXM1181
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
=====Circuit Symbol and No.===Part Name
Part No.
---
------
------------------------------------------
-------------------------
B
D E
PCB Unit
Consists
SW1 PCB
SW2 PCB
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41
MEH-P5350
6. ADJUSTMENT
6.1 ADJUSTING THE MD SECTION
1) Precautions
Since the single voltage (3.3V) system is being employed for the regulator of this equipment, the reference potential
for the servo signals becomes Vc (1.65V, approximately).
In this manual, the Vc reference potential will be indicated as **Vc (e.g. 1.5Vc) and the reference GND will be indicat-
ed as **V.
If connection errors of the Vc and the GND are made while product adjustment is being made, it becomes unfeasible
to measure the electric potential correctly and, moreover, the servo can make malfunctioning to apply severe
impacts to the pick up. Consequently, to prevent occurrence of such an error, observe the followings.
1.Do not make connection errors of the Vc and the GND when connecting the negative side of the probe of the instru-
ment.
For example, do not connect the Vc to the negative side of the probe ch1 nor connect the GND to the negative side
of the probe ch2 of the oscilloscope.
Also, since the measuring instrument proper usually carries the same potential as that of the negative side of the
probe, in many cases, set the measuring instrument proper to a floated state.
2.When installing and removing the filters and wires necessary for the measurement work, always turn “OFF” the batt.
and Acc line. (Only when the regulator is turned off, the microcomputer is negatively occasionally affected.)*1
3.Since various protection means of the software are not valid under the test mode, be careful not to apply mechanical
shock and electric shocks while adjustment work is in progress.
4.This equipment works to discriminate the discs namely, high reflection discs (premaster) and low reflection discs
(recordable), when the discrimination SW is duly operated.
(High reflection Disc=0V and low reflection Disc=5V with the CN401 / 4-pin / Contact Pin Name: DISC as is shown in
the circuit diagram)
Disc discrimination can be confirmed by the following indications appearing under (the above octonary digits) the
TEST MD mode, after completing floating of the disc under the TEST mode.
In case of high refection: 02200000 In case of low refection: 01100000 (The second and third digits counting from
the Left-hand side will become “2” or “1”.)
Unless disc discrimination is made properly, accurate automatic adjustment and grating adjustment cannot be
expected and always confirm the above when starting up the TEST mode.
2)LD protection for the pickup
Unlike MD pickups, the MD pickups being used for this equipment are not equipped with the LD protection short pin
but, instead, a shorting land by soldering is being provided.
When removing, make a shorting by soldering before removing the flex.
To protect the flex., limit the time to apply the soldering iron to a short time. Reference application time: within 2
seconds.
3)Regarding the TEST mode
This mode should be used when adjusting and inspecting the MD mechanism module of this equipment.
1.When entering into the TEST mode:
Pressing and holding the “4” key and “6” key simultaneously, turn ON the “B.u” and “Acc” at the same time.
Select the “MD Source” using the SOURCE key. (Keep the Disc inserted.)
2.When canceling the TEST mode:
Turn OFF the “B.u” and “Acc”.
3.When turning ON the MD power
Press the key “BAND” to start up the 3.3v for the MD regulator.
Meanwhile, pay attention to the fact that the microcomputer supply power Vdd5v starts up when the “B.u” and
“Acc” are turned on.
4.Measuring LD electric current
When measuring the voltage between 3VD and VI using a multimeter or the like, be sure to connect the measuring
instrument on the power supply off before turning on the power supply.
If you make contact between 3VD and VI using a clip or the like after turning on the power supply, the noise could
cause LD failure.
*1 At "Batt. Line" is on and "Acc Line" is on , MD is off(regulator id off).
Power supply of MD mechanism for microcomputer : VDD is on.
Additionally , power supply for IC : MDVD and PVD are off.
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42
MEH-P5350
- Grating adjustment
1) Regarding the TEST Disc
When performing grating adjustment and grating confirmations, use the high reflection Disc (MMD-110).
When confirming the operation state and automatic adjustment state, us the high reflection Disc (MMD-110) and low
reflection Disc (MMD-212), respectively.
2) When the pickup unit or the spindle motor has been replaced, be sure to perform the grading adjust-
ment and grating confirmation.
3) Grating adjustment
Purpose: To check and confirm if the grating is properly adjusted after the pickup unit or the spindle motor has been
replaced.
Observe the waveforms of “E” and “F” after having been passed through the iv amplifier L.P.F. using an oscilloscope
(X-Y ch) to check if the phase difference is within 30 deg. and, otherwise, to adjust it within the range.
Failure phenomena when the grating is being deviated substantially:
Tracking close becomes unworkable, tracking search becomes inoperable or tracking search takes too long time.
Checking method
Measuring instruments: Oscilloscope , GGD1223(21Pin cord) and GGF1370(MD adjustment PCB)
Measuring points: E. F and Vc
TEST Disc: MMD-110 (TEAC), TEST mode Focus closed state (Tracking open)
4) Confirmation procedures
1. Select the “MD Source” to inter into the TEST MD mode. Use the MMD-110 as the test Disc. An indication read-
ing “POWER ON” will appear.
2. Make the key operation of 2 -> 2 -> 1 -> 1 to bring into the focus close state. The indication will be “2221 0000”
and the pickup will be located at the innermost track position.
Key operation
Indications(the above octonary digits)
Statuses
BAND
"POWER ON"
MD circuit 3.3v power “ON”
2
"02200 00"
Disc discrimination (High reflection)
2
"02210 00"
Offset adjustment
1
"12210 00"
LD on
1
"22210 00"
Focus close
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