1-1 A AC :Alternating Current ACC :Automatic Color Control ACSS :Automatic Channel Setting System ADJ :Adjust A/E :Audio Erase AFC :Automatic Frequency Control AFT :Automatic Fine Tuning AGC :Automatic Gain Control A.H.SW :Audio Head Switch ALC :Automatic Level Control AM :Amplitude Modulation AMP :Amplifier ANT :Antenna APC :Automatic Phase Control ASS’Y :Assembly AUX :Auxiliary B B :Base BGP :Burst Gate Pulse BPF :Bandpass Filter BS :Brodcasting Satellite BW or B/W :Black and White C C :Capacitor, Chroma, Collector CAN :Cancel CAP :Capstan CAP.BRK :Capstan Brake CAP.RVS :Capstan Reverse CATV :Cable Television CBA :Circuit Board Assembly CCD :Charge Coupled Device C.CTL :Chro Control, Capstan Control CFG :Capstan Frequency Generator CHROMA :Chrominance CNR :Chroma Noise Redution COMB :Combination Comb Filter COMP :Comparator Composite Compensation CONV :Converter C.ROT SW :Color Rotary Switch CS :Chip Selcet C.SYNC :Composite Synchronization CTL DIV :Control Divide CUR :Current CYL :Cylinder D D :Drum, Digital, Diode, Drain D.ADJ :Drum Adjust DC :Direct Current D.CTL :Drum Control DEMOD :Demodulator DET :Detector DEV :Deviation DHP :Double High Pass DIGITRON :Digital Display Tube DL :Delay line DOC :Drop Out Compensator DUB :Dubbing D.V SYNC :Dummy Vertical Synchronization E E :Emitter EE :Electric to Eletric EMPH :Emphasis ENA :Enable ENV :Envelope EP :Extended Play EQ :Equalizer EXP :Expander F F :Fuse FB :Feed Back FBC :Feed Back Clamp FE :Full Erase FG :Frequency Generator FL :Filter FM :Frequency Modulation F/R :Front/Rear FS :Frequency Synthesizer FSC :Subcarrier Frequency F/V :Frequency Voltage G GEN :Generator H H :High, Horizontal I IC :Integrated Circuit IF :Intermediate Frequency INS :Insert L L :Low, Left, Coil LD :LED LD VTG CTL :Loading Voltage Control LECHA :Letter Character L.M :Level Meter LP :Long Play LPF :Low Pass Filter M MAX :Maximum MD :Modulator MECHA.CTL :Mechanism Control MIC :Microphone MIN :Minimum MIX :Mixer, Mixing M.M. :Monostable, Multivibrator MMV :Mono Multi Vibrator MOD :Modulation, Modulator MODEM :Modulator-Demodulator MPX :Multiplex N NR :Noise Reduction O OSC :Oscillator OSD :On Screen Display P PB :Playback PCB :Printed Circuit Board P.CTL :Power Control PRE-AMP :Preamplifier P.F :Power Failure PG :Pulse Generator PLL :Phase Locked Loop PREM.DET :Premire Detect P.P :Peak-to-Peak PS :Phase Shift PWM :Pulse Width Modulation PWR CTL :Power Control Q Q :Transistor QH :Quasi Horizontal QSR :Quick Setting Record QTR :Quick Timer Record QV :Quasi Vertical R R :Resistor, Right RE(or RC) :Remocon, Receiver REC :Recording REC S ‘H’ :Record Start ‘Hight’ REF :Reference REG :Regulated, Regulator REMOCON :Remote Control(unit) RF :Radio Frequency R/P :Record/Playback RTC :Reel Time Counter S S :Serial S.ACCEL :Slow Accel SAOP :Second Audio Program SC :Scart, Simulcast S.DET :Secam Detect SH :Shift SHARP :Sharpness SIF :Sound Intermediate Frequency SLD :Side Locking S/N :Signal to Noise Ratio SP :Standard Play ST :Stereo SUB :Subtract, Subcarrier SW or S/W :Switch SYNC :Synchronization SYSCON :System Control T T :Coil TP :Test Point TR :Transistor TRK :Tracking TRANS :Transformer TU :Tuner, Take-up U UHF :Ultra High Frequency UNREG :Unregulated V V :Volt, Vertical VA :Always Voltage VCO :Voltage Controlled Oscillator VGC :Voltage Gain Control VHF :Very High Frequency V.H.SW :Video Head Switch VISS :VHS Index Search VPS :Video Program System VR :Variable Resistor or Volume V-SYNC :Vertical Synchronization VTG :Voltage VV :Voltage to Voltage VXO :Voltage X-tal Oscillator W W :Watt WHT :White W/O :With out X X-TAL :Crystal Y Y/C :Luminance/Chrominance YNR :Luminance Noise Reduction Z ZD :Zener Diode SECTION1 SUMMARY KEY TO ABBREVIATIONS 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 1-2 IMPORTANT SAFETY NOTICE This manual was prepared for use only by properly trained audio-video service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs. Special components are also used to prevent x-radiation, shock and fire haz- ard. These components are indicated by the letter “x” included in their compo- nent designators and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics Corporation. Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed. CAUTION: Do not attempt to modify this product in any way. Never perform customized installations without manufacturer’s approval. Unauthorized modi- fications will not only void the warranty, but may lead to property damage or user injury. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines. GRAPHIC SYMBOLS The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature. The lightning flash with arrowhead symbol within an equilateral tri- angle is intended to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magni- tude to constitute a risk of electric shock. The pictorial representation of a fuse and its rating within an equi- lateral triangle is intended to convey to the service personnel the following fuse replacement caution notice: CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE. SERVICE INFORMATION While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the fol- lowing: FIRE AND SHOCK HAZARD 1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items trans-ported to and from the repair shop. 2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated. 3. Soldering must be inspected to discover possible cold solder joints, solder splashes, or sharp solder points. Be certain to remove all loose foreign par- ticles. 4. Check for physical evidence of damage or deterioration to parts and compo- nents, for frayed leads or damaged insulation (including the AC cord), and replace if necessary. 5. No lead or component should touch a high current device or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided. 6. After reassembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS- FORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metal- lic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti- tutes a potential shock hazard and must be corrected immediately. X-RADIATION 1. Be sure procedures and instructions to all service personnel cover the sub- ject of x-radiation. The only potential source of x-rays in current TV receivers is the picture tube. However, this tube does not emit x-rays when the HV is at the factory-specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure of the picture tube or high-voltage supply and, under certain circumstances may produce radiation in excess of desirable levels. 2. Only factory-specified CRT anode connectors must be used. 3. It is essential that the service personnel have available an accurate and reli- able high-voltage meter. 4. When the high-voltage circuitry is operating properly, there is no possibility of an x-radiation problem. Every time a chassis is serviced, the brightness should be run up and down while monitoring the high voltage with a meter, to be certain that the high voltage does not exceed the specified value and that it is regulating correctly. 5. When troubleshooting and making test measurements in a product with a problem of excessively high voltage, avoid being unnecessarily close to the picture tube and the high voltage power supply. Do not operate the product longer than necessary to locate the cause of excessive voltage. 6. Refer to the CRT Anode High Voltage Measurement and Shutdown Adjustment procedures described in the appropriate text (where used). IMPLOSION 1. All direct view picture tubes are equipped with an integral implosion protec- tion system; take care to avoid damage during installation. 2. Use only the recommended factory replacement tubes. TIPS ON PROPER INSTALLATION 1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow. 2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radiators where steam leakage is a factor, etc. 3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation. 4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations. 5. Caution customers against mounting a product on a sloping shelf or in a tilt- ed position, unless the receiver is properly secured. 6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small cast- ers across thresholds or deep pile carpets. 7. Caution customers against using a cart or stand that has not been listed by Underwriters Laboratories, Inc. for use with its specific model of television receiver or generically approved for use with TVs of the same or larger screen size. 8. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous conse- quences to home and family. A.C. Voltmeter 1500 OHM 10 WATT Place this probe on each exposed metal part. Good Earth Ground such as the Water Pipe, Conduit, etc. 0.15uF PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS 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 1-3 SERVICING PRECAUTIONS CAUTION : Before servicing the VCR covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circum- stances create conflict between the following servicing pre- cautions and any of the safety precautions in this publica- tions, always follow the safety precautions. Remembers Safety First: General Servicing Precautions 1. Always unplug the VCR AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board, module, or any other assembly. (2) Disconnection or reconnecting any internal electrical plug or other electrical connection. (3) Connecting a test substitute in parallel with an elec- trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this VCR or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required. 4. Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipped. 5. Do not apply AC power to this VCR and/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed. 6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resis- tance between each blade of the attachment plug and acces- sible conductive parts (Note 1) should be more than 1M- ohm. Note 1 : Accessible Conductive Parts including Metal pan- els, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor compo- nent or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commer- cially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grouned-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static elec- tricity sufficient to damage an ES device.) 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 1-4 • The Contents of Examination As all the IC that is applied to VCR is controlled by IIC, mutual communication, if Vcc of IC is short or open with detecting ‘Acknowledge’ data of the specific IC according to each power(5V, 5VT) µ-COM gets unable to detect ‘ACK’ data. µ-COM regards this case as abnormal one and if it can’t detect ‘ACK’ data for a certain time(3.5 sec) the sig- nal of ‘Power Control’ and ‘Timer Control’ are switched to ‘Low’. As a result POWER Switching TR is kept from generating heat and fire. • POWER for each IC S/ 5V POWER SECAM IC Series 5VT POWER AVCP IC P/Y/I 5V POWER Modulator Series 5VT POWER AVCP IC *Short protection off mode : DJ01 Diode in PROPOSAL FOR APPLYING SHORT PROTECTION IIC BUS 5VT SW POWER CONTROL MASTER TIMER CONTROL 5VT SW SLAVE with 5V SLAVE with 5V 5.3VA Timer Control AVCP IC TUNER Conception BLOCK Diagram 5.2V 5.2VT • IC to detect ‘ACK’ data is selected as below because IC is different in accordance to region and option 5.3VA Power Control Modulator Hi-Fi IC NICAM IC SECAM IC 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 1-5 In case that defective EEPROM of PAL models is replaced, to operate these sets from the initial state MP KEY must be repaired as well before delivering to the customer. If MP KEY isn’t repaired the setting of RF OUT channel or LANGUAGE might be different from that for cus- tormer’s country. •MP KEY : In case of PAL VCR if holding the REC button on the front panel and the CLEAR button on the remote control handset for 5 ~ 7 seconds with power being switch all and no tapes, OK is displayed at FLD for FLD models and LED becomes on for LED CLOCK models. This is the state that initializing EEPROM is finished. (In case of PAL VCP if holding the REC button on the front panel and the MENU button on the remote control handset for 5 ~ 7 seconds with power being off and no tapes, All the LED DOTs become on. This is the state that initializing EEPROM is finished.) •MP KEY's function : MP KEY sets EEPROM's data up to the initial state. SERVICE NOTICE ON REPLACING EEPROM TIMER AM REC VCR OK • FLD MODEL: MP KEY “OK” • LED CLOCK MODEL: MP KEY Switch all on a Light • LED DOT MODEL: MP KEY Switch all on a Light 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 1-7 SPECIFICATIONS General Power : 110~240V, 50/60Hz Power consumption : Approx. 12 watts(Energy Saving mode : 3 watts) Video Head system : Double azimuth 4 heads, helical scanning system (4HD MONO, 4HD Hi-Fi Model Only) Tape speed : 23.39 mm/sec (SP mode)11.69 mm/sec(LP mode) Tape format : Tape width 1/2” (12.7 mm high density VHS tape) Maximum recording time : 4 hours in SP mode/8 hours in LP mode (with E-240 tape) Rewind time : Approx. 150 sec. (with E-180 tape) Dimensions (W X H X D) : 360 x 94.5 x 230 mm Weight : 9.0 lbs. (4.0 kg) Operating temperature : 41°F-95°F (5°C-35°C) Operating humidity : Less than 80% Timer : 24 hours display type Video Input level : VIDEO IN (RCA type) 1.0 Vp-p, 75 ohm, unbalanced Output level : VIDEO OUT (RCA type) 1.0 Vp-p, 75 ohm, unbalanced Signal to noise ratio : More than 43 dBm RF Modulator : UHF 28~68(Adjustable) Audio Input level : AUDIO IN (RCA type) -6.0dBm, more than 47kΩ Output level : AUDIO OUT (RCA type) -6.0 dBm, less than 1kΩ Track Mono track & Hi-Fi track Frequency response : Normal : 100 Hz - 10 kHz(-6/+3 dB) Hi-Fi : 20 Hz - 20 kHz(3-/+3 dB) Signal to noise ratio : Normal : More than 43 dBm(at SP mode) Dynamic range : Hi-Fi : More than 70 dBm(at SP mode) Hi-Fi : More than 85 dBm(at SP mode) • Design and specifications are subject to change without notice. :Hi-Fi Model only 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 2-1 SECTION2 CABINET & MAIN FRAME Fig.2-1 SERVICE METHOD (1) Disassembly Flow (Positioned Upside Down) (2) Re-assembly Flow for service like Fig. 2-1 (3) To check and replace Electrical parts 1 Disassemble the unit according to No.1) Disassembly Flow. 2 Re-assemble the unit according to No.2) Re-assembly Flow. 3 Place the unit like Fig. 2-1 4 Check and replace Electrical parts. NOTE : 1 Insert Video Cassette Tape inversely like Fig. 2-1 to check and replace defective parts. 2 In disassembling and reassembling, be careful not to damaged CST switch. Top Case Bottom Cover Front Panel Housing & Deck Assembly Main C.B.A LED C.B.A LED C.B.A Main C.B.A Housing & Deck Assembly Housing y Mecanismo Cassette Tape (Upside Down) C.B.A Princioal 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 2-2 EXPLODED VIEWS 1. Cabinet and Main Frame Section 283 280 284 261 260 457 A00 464 462 462 250 300 A43 330 452 457 320 A46 A42 A49 A 5 4 3 2 1 B C D NOTE) Refer to “SECTION 5 REPLACEMENT PARTS LIST” in order to look for the part number of each part. _ OPTIONAL PARTS 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 2.Packing Accessory Section OPTIONAL PARTS CABLE, COAXIAL CABLE ASS'Y RF (Optional parts) 810 BATTERY 808 806 PLUG ASS'Y 2WAY (Optional parts) 812 PLUG ASS'Y 1WAY (Optional parts) 811 REMOCON 900 PACKING (RF) 803 PACKING (LF) 803 BOX CARTON 802 BAG. SOFR SHEET 804 INSTRUCTION MANUAL 801 NOTE) Refer to “SECTION REPLACEMENT PARTS LIST NOTE) in order to look for the part number of each part. 2-3 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 3-1 Hi-Fi AVCP U-COM S M P S SYSTEM A/V DECK CNT. A/V JACK T U N E R TUNER & MODULATOR SMPS LED DRIVE CLK/DOT DISP KEY BOARD(L) KEY BOARD(R) 3/4 CH SWITCH : Measurement point : Adjustment point SECTION 3 ELECTRICAL ELECTRICAL ADJUSTMENT POINTS ARRANGEMENT 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 3-2 ELECTRICAL ADJUSTMENT PROCEDURES 1. Servo Adjustment 1) PG Adjustment • Test Equipment • Adjustment And Specification a) OSCILLOSCOPE b) PAL TEST TAPE (VHS SP) c) JIG REMOCON (AUTO PG SETTING) MODE PLAY • Adjustment Procedure a) Insert the PAL SP Test Tape and play. Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the PAL SP Test Tape is inserted. b) Press the Auto PG KEY on JIG Remocon(1’st) or Press “Play” key on set and “0” key on Remocon.(Then check the blink “TRK OK” (Hi-Fi Model), “ALL LIGHT”(MONO Model) on CLK/LED -TRK is a Initial) c) Press the Auto PG Key on JIG Remocon again (2’nd) or press “Play” key on set and “0” key on Remocon again.(Then check the blink “PG NG > PG OK” on CLK/LED(Hi-Fi Model), Then check the blink “PG waveform” on oscilloscope(MONO Model)). • Check the PG a) Connect the CH1 of the oscilloscope to the H/SW and CD2 to the Video out for the VCR. b) Trigger the mixed Video Signal of CH2 to the CH1 H/SW(W714, W715), and then check the distance (time difference), which is from the selected A(B) Head point of the H/SW(W714, W715) signal to the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64.0µs). • CONNECTION V.Out H/SW(W714, W715) 6.5 ± 0.5H MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION V.Out H/SW(W714,W715) OSCILLOSCOPE CH1 CH2 V.out H/SW (W714, W715) 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 3-3 ELECTRICAL ADJUSTMENT PROCEDURES • WAVEFORM • Attension and Reference a) The PG checking must do when RF Level is Maximum and SERVO system is Locking (MTR MODE) b) V.H/SW Level is 2Vpp. H/SW Composite VIDEO 6.5H(416us) 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 3-4 ELECTRICAL TROUBLESHOOTING GUIDE 1. Power Circuit(SMPS) (1) No 5.3VA. No 5.3VA. Is the F101 normal? Is the BD101 normal? Is the R101 normal? Does the oscillation waveform appear at the IC101 Pin 7? Is there DC voltage at the IC101 Pin 4? Is there about 2.5V at the IC103 Vref ? Is the D106 normal? Check the Main PCB 5.3VA Line short? Replace the F101 (Use the same Fuse). Replace the BD101. Replace the R101. Is Vcc(about 13~15V) permittable at the IC101 Pin 3? Check or Replace the D103. Replace the IC102. Replace the IC103. Replace the D106. NO YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO 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 3-5 Is the D109 normal? Replace the D109. Check 12VA Line of the Main PCB short. YES YES No 12VA. Does 5.3VA work normally? Check whether 5.3VA is out of order. YES NO NO 7. Power Circuit(SMPS) (2) No 12VA.(Capstan) (3) No 12V (Hi-Fi, Buffer) Is Voltage(about 13V) put into the Q152(B)? Check or Replace the Q152. YES YES No 12VA. Is Vcc(about 12V) put into the Q152(E)? Replace the Peripheral Circuitry of ZD152. YES NO 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 7. Power Circuit(SMPS) (4) No 5V Is about 4.7V put into the Q155(Q157) Base? Check the Q156 whether it works normally. Check or Replace the Q155(Q157). YES YES No 5V. Is the Q156 Base “H”? Is 5.3VA put into the Q155(Q157) collector? Check the µ-com Control. YES YES NO NO 3-6 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 3-7 2. Servo Circuit Unstable Video in PB Mode. Does the on screen noise level change periodically? Do CTL pulses appear at IC501 pin 97? Does the CFG divide waveform appear at IC501 pin 87? Do the CTL pulses move when TRK is operated? Replace IC501. Does the Video Envelope waveform appear at IC501 Pin 9? NO YES YES YES YES YES A. Is the height of the CTL Head adjusted correctly? NO Replace IC501. NO Check Y/C Block. NO Adjust the CTL Head. 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 3-8 Drum Motor stopped. Does 12V appear at PMC01 PIN8? Does Drum CTL signal appear at PMC01 PIN12? Check Connector and Drum Motor Ass’y. Check the Components and foil Pattern between IC501 Pin 76 and PMC01 Pin 12 for shorts. Does the Drum PWM waveform appear at IC501 Pin 76? Check the Components and foil Pattern Connected to IC501 Pin 76 PMC01 Pin 12 for shorts. Do DPG/FG Pulses appear at IC501 Pin 90? B. NO NO NO NO Check Power. Does Drum PWM appear at IC501 Pin 76? Do DPG/FG Pulses appear at PMC01 Pin 11? Check Drum Monitor Ass’y. Check the Components and foil pattern between PMC01 Pin 11 and IC501 Pin 90 for shorts. Replace IC501. YES YES YES YES YES NO NO 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 3-9 Capstan Motor Stopped. Check Power. Does PWM wave appear at IC501 Pin 77? Does the CFG signal appear at PMC01 Pin 1? Check Capstan Motor Ass’y. Check Components and foil patterns between PMC01 Pin 1 and IC501 Pin 87 for shorts. Replace IC501. Does 12VA appear at PMC01 Pin 2? Does 2.8V appear at PMC01 Pin 9? Check Connector and Capstan Motor Ass’y. Check the Components and foil Patterns Connected between IC501 Pin 77 and PMC01 Pin 9 for shorts. Does the CFG signal appear at IC501 Pin 87? Does Capstan PWM appear at IC501 Pin 77? Check the components and foil pattern connected between IC501 Pin 77 and PMC01 Pin 9 for shorts C. NO NO NO NO NO YES YES YES YES YES YES NO 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 3-10 YES YES Replace the Take-Up Reel Photocoupler on Main PWB Board(RS501). Check the Power. Check the Drum Motor Signal. Auto stop. Does SW30 waveform appear at IC501 Pin 18? Do Take-up reel pulses appear at IC501 Pin 80? Change IC501. A. NO NO NO YES 3. System & Front Panel Circuit Does 5.3V appear at RS501. 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 3-11 YES YES Cassette tape loading is unstable. Is REG 12V applied to PMC01 Pin 8? Is High signal applied to IC501 Pin 58 When inserting the CST? Does Low signal occur form IC501 Pin 60 when inserting the CST? Check the Deck Mechanism. NOTE : Auto stop may also be caused by lack of lubrication,due to dried grease or oil. Is 5.3V applied to R544? Check the power. Check IC501 Pins 22, 23, 24, 25. Change IC501. Check the CST SW and peripheral circuitry. Check the power. B. NO NO NO YES NO YES YES 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 3-12 Non working functon buttons. Is the voltage of IC501 Pin 99, 5V? Does LED CLOCK, LED DOT display change when a function button is pressed? Replace IC501. Check the power. Replace the defective Switch. (Function SW) C. YES YES NO NO LED CLOCK, LED DOT doesn’t work. Is 5V applied to IC501 Pins 37 and IC5F1 Pins 5, 18? Check the ( OPTION 1) Do pulse appear at IC501 Pins 65, 66 and 67. Replace IC501. Check the power circuit. D. YES YES Do oscillation appear at IC5F1 Pin1. YES Check the foil patterns between IV5F1 and OPTION2. YES OPTION 1 : D5E4 LED CLOCK OPTION 2 : LED 501 - LED CLOCK LED 502 - LED DOT Replace OPTION 2 YES NO NO Replace IC5F1. NO 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 3-13 4. Y/C CIRCUIT (1) No Video in EE Mode, No Video in EE Mode Check the Video Input Jack. (Line In Jack) Does the Video signal appear at the IC301 Pin 48? Is 5V applied to the IC301 Pins 18, 24, 42, 55, 72, 91? Does the Video signal appear at the IC301 Pin 65? Does the Video signal appear at the IC501 Pin 50? Does the Video signal appear at the Emitter termi- nal of the Q701? Check the 5.2V, 5.4VA Line. (Power Circuit) Is I2C BUS signal applied to the IC301 Pins 68, 69? Check C316. (AGC) Chck the path of the signal between the IC301 Pin 5 and IC501 Pin 50. Replace the IC301. Does the 12V appear at the Emitter terminal of the Q701. Replace the Q701. Check the 12V Line. (Power Circuit) Check the System Circuit. (Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’) YES YES YES YES YES YES YES NO NO NO NO NO NO NO 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 3-14 3. Y/C CIRCUIT (2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode, Is 5.2VT, 5.4VA applied to the IC301 Pins 24, 42, 55, 72, 91? Is the I2C Bus siganl applied to the IC301 Pins 68, 69 ? Does the normal RF signal appear at the IC301 Pin 78? Check the line of the 5.2V Line. (Power Circuit) Check the System Circuit. (IC501 Pin 18) Check the V.H.S/W level. (Check R303, R304) Replace the IC301. Refer to ‘SYSTEM I2C BUS CHECK Trouble Shooting’. Is the V.H.S/W signal applied to the IC301 Pin 70? Is V.H.S/W “H” about 3.4V at the IC301 Pin 70? Clean the Drum. Check the path of the Y(Luminance) RF signal. (Check C327) Check the path of the Y(Luminance) RF signal. (Check the C312) Does the Y(Luminance) RF signal appear at the IC301 Pin 76? Is the Y(Luminance) Video waveform showed up at theIC301 Pin 43? Replace the IC301. NO YES YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO 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 3-15 3. Y/C CIRCUIT (3) When the C(Color) signal doesn’t appear on the screen in PB Mode, Is 5.2V/5.3VA applied to the IC301 Pins 24, 42, 55, 72, 91. Is the Color Rotary signal applied to the IC301 Pin 70? Does the Color signal appear at the IC301 Pin 25 ? Check the line of the 5.2V/ 5.3VA Line. (Power Circuit) Replace the X301. Check the Color Pass. Check the Color Rotary Circuit. (IC501 pin 15) Check the Color Rotary level. (Check the R303) Does the X301(4.43MHZ) oscillate? Replace the IC301. Does the Color signal appear at the IC301 Pin 21? Is Color Rotary “H” about 3.4V? Replace the IC301. NO YES YES YES YES NO NO NO NO NO YES 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 3-16 3. Y/C CIRCUIT (4) When the Video signal doesn’t appear on the screen in REC Mode, Is the EE signal normal? Is 5.2V/5.3VA applied to the IC301 Pins 24,42,55,72,91? Does the RF signal appear at the IC301 Pin 78? Check EE Mode. Check the System of REC ‘H’. (the IC501 Pin 74 / the D301) Replace the IC301. Check the line of the 5.2V/ 5.3VA Line.(Power Circuit) Check PB Mode. Is the REC ‘H’ signal (about 4V) applied to the IC301 Pin 80? Check the circuit of the IC301 Pins 85, 86. Check REC Luminance Pass & Color Pass. Does PB Mdoe operate normally? Does the REC RF signal appear at the IC301 Pins 88,89,94,95? Check the Drum & Drum Connector YES YES YES YES YES NO NO NO NO NO NO YES YES YES 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 3-17 5. Tuner/IF circuit (1) No picture on the TV screen No picture on the TV screen Does the Video signal at the TU701 Pin24? Check 34V line. Check 5.2V line. Check the liC Clock signal of µ-com Pin 71. Is +30V applied to TU701 Pin 16? Is +5.2V applied to TU701 Pin 13? Does the Clock signal appear at TU701 Pin 11? Does the data signal appear at TU701 Pin 12? Replace Tuner Check the signal flow from TU701 Pin 24 to IC301 Pin 48. Does the Video signal at the IC501 Pin50? Check the signal flow from IC501 Pin52 to JK301. YES YES YES YES YES YES YES NO NO NO NO NO Check the liC Data signal of µ-com Pin 72. NO 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 3-18 (2) No sound (Mono Model) No sound Check the Vcc of IC301 Pin 18. Check the Tuner Audio signal at IC301 Pin 13. Check the Audio signal at IC301 Pin 11. Check 5.2V power. Chekc the signal flow from TU701 Pin21 to IC301 Pin 13. Replace IC301. NO NO NO YES YES YES Check the signal flow from IC301 pin 11 to JK301. YES 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 3-19 (3) No sound (Hi-Fi Model) No sound Check the Vcc of IC751 Pins 1, 19, 33. Check the Tuner SiF signal at IC751 Pin 2. Check the oscillator of IC751 Pins 5, 6. Check the Audio of IC751 Pins 30, 31. Check the Audio of IC801 Pins 2, 3. Check the Audio of IC801 Pins 18, 19. Check the signal flow from IC801 pins 18, 19 to JK301. Check 5V power. Check the Tuner Audio of TU701 Pin 21. Replace X751. Check the IIC Clock and Data at IC751 Pins 12, 13. Check the signal flow from IC751 Pins 30, 31 to IC801 Pins 2,3. Check the IIC Clock and Data at IC801 Pins 42, 43. YES YES YES YES YES YES YES NO NO NO NO NO NO 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 3-20 Check power. Check IC501 Pin 19. (Audio head switch 25) Check the Vcc of IC801.(Pins 34, 40) Is the Head switching signal IC802 Pin 41 O.K? Check the connection at P3D01 if good then Replace IC801. Check Ports of µ-COM. Replace IC801. Hi-Fi Playback. No sound Check the Hi-Fi Selection Switch and the Tape quality. Is the RF Envelope at IC801 Pin 44 over 2Vp-p? Check the Signal path of Audio Output. Do Audio signals appear at IC801 Pin 16(L-CH), 17(R-CH)? Check IC801 Pin 42(Data), Pin 43(Clock). A. YES NO YES NO NO NO NO 6. Hi-Fi Circuit (Hi-Fi Model) YES YES YES YES YES 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 3-21 Hi-Fi REC. It is impossible to record and playback Hi-Fi Audio signal. Check Vcc of IC801. (Pins 34,40) Check Power. Check ports of µ-COM. Check Audio input signal of IC801 Pins 2, 3(TU.A.), 6, 7(Scart 1) Replace IC801. B. Check IC801 Pin 42(Data),Pin 43(CLOCK). Do Audio signals appear at IC801 Pins 16, 17? YES YES YES Do FM Audio signals appear at IC801 Pin 36? Check the Contact Points of Drum Connector if good then Replace the Drum. YES YES NO NO NO NO 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 3-22 3-23 BLOCK DIAGRAMS 1. Power Block Diagram 5.4VA TO SYS, TU/IF HOT CIRCUIT BD101 R101 R106 R102 C103 C113 C112 HOT GND F101 WH (BL) BK (BR) PW101 6 7 8 9 10 3 2 4 3 11 12 1 2 IC102 IC103 4 T101 TRANSFORMER 4 2 3 1 RECTIFIER & SMOOTHING DRIVE & S/W BLOCK OVER CURRENT LIMIT BLOCK + TO Hi-Fi TO TU/IF 12V TO CAPSTAN M 24/12VA 33V TO AV, TU/IF, 5.2VT TO DRUM 12VA 5.2V TO Hi-Fi, Sensor SECAM D152 D154 D155 D151 SNUBBER BLOCK (IC101, R109, C135, D103, R103,C109, R125, R126) (D102,R104, C105,C106) (D109, C120, L104,C121) NOTES : Symbol denotes AC ground. Symbol denotes DC chassis ground. ! ! ! ! ! ! ! ! FROM µ-COM P.CTL"H" LINE FILTER BLOCK (C101,L102, C102) RECTIFIER & SMOOTHING (D105, C115) 34V S/W BLOCK (Q154, R154, R155) 5VT SW BLOCK (Q157, R170, R171, D157) 5V S/W BLOCK PWR CTL BLOCK (Q155, R156, R157, D158) (Q162, R161) FEED-BACK BLOCK (R116,R117,R118 R119,R120,R121 C114) '00 11. 30 F. µ-com HSR "H" Q161 R163 Q152, ZD152, R153, C155 24V S/W Q159,R166,R167 RECTIFIER & SMOOTHING (D106, C116, L103,C117) RECTIFIER & SMOOTHING (D110, C123) w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-24 3-25 2. Tu/IF, NICAM & A2 Block Diagram 34V (From Power) 109 100 731 72 71 73 106 109 52 109 871 108 5.4VA 733 V.out 5.2V V.IN IC751 MSP3417 MSP3407 w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-26 3-27 3. Y/C Block Diagram (PB MODE) 90 93 96 84 V.ENV 87 70 V.H.SW C.ROTARY DATA CLOCK V.OUT (MICOM) 69 68 67 C-Delay (1H/2H) BPF MAIN CONV ACC C LPF CCD LPF ACC DET CNC 25 21 IC301 LA71750M PB FM EQ FM OEM PB FM AGC MAIN DE EMP Y-LPF YNR SUB LPF 60dB AMP Y/C MIX 65 63 61 46 43 Y-Delay 79 78 (REC MODE) 80 REC'H' V.H.SW C.ROTARY DATA CLOCK V.OUT MICOM V.IN4 FRONT V.IN3 DEC 79 78 76 75 70 69 68 67 65 59 58 54 52 50 V.IN2 S1 V.IN1 TUNER 48 46 43 33 32 31 CLK-IN 29 28 4.43MHz 27 21 95 94 89 88 Killer C-LPF ACC BPF Main Conv Main Conv DETAIL ENH NL EMPHA W/D CLIP IC301 LA71750M UP REC SP REC (To Drum) (To Drum) W/D CLIP REC FM EQ Y-LPF FBC AGC SW Y-DELAY KILL DEC REC APC VX02 VX02 COMP AMP 1H/2H DELAY YNR 4. Hi-Fi Block Diagram (Hi-Fi Model) 1 2 3 4 5 6 7 8 9 10 13 16 17 19 20 21 35 36 37 22 32 33 31 30 29 28 27 26 25 24 23 Audio input Block • Tuner • F.A/V • A/V1 Modulator A.out (To Tuner) Audio Out Normal A.out (To AVCP) Normal A.IN (From AVCP) Hi-Fi PNR Block Hi-Fi REC Block A B IC801 w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-28 3-29 5. System Block Diagram GND MODE S1 MODE S2 MODE S3 MODE S4 MODE S/W TO/FROM AVCP T-UP REEL T-UP END SUP REEL CST.SW 5.1V CS501 5.3VA 5.3VA ES501 R550 LD501 DECK IR LED R553 R555 RS501 RS502 R556 R558 C582 R584 R5C5 R5C7 R583 C534 R544 C552 R5C6 C500 C517 R541 R529 R583 L505 MS501 X502 14MHz 32.768KHz OSC OSC X501 1 2 RESET GND Vcc 3 5.3VA 5.3V 5.1V IC504 + + + C592 +C503 L501 R557 SUP END ES502 C535 R564 R531 OSC R/C RC501 Q502 L511 R598 C595 C596 + C561 TO/FROM DECK Q503 Q501 CV IN 25 24 23 22 85 79 58 80 88 49 40 37 98 34 IC501 M37760 MODE S1 I-Limit MODE S2 MODE S3 MODE S4 T-UP Sensor T-UP Reel SUP Reel CST IN Vss (AMP) Vss (OSD) Vss (SYSCON) Vcc (SYSCON) Vcc (SERVO) CAP. PWM CTL + CTL - CFG CAP. REV 'H' CAP. ACCEL LD- LD+ V. ENV V.H.SW30 DPG D.V.Sync CVin(EDS) 38 39 X out Xc in Xc out X in 35 36 53 52 44 fsc IN fsc OUT OSC in 2 95 94 87 12 59 60 83 9 18 56 76 90 13 77 11 DRUM PWM 53 Vcc (OSD) 84 SUP Sensor 45 OSC out 2 14 99 Vcc (A/D) TO/FROM AUDIO(Hi-Fi) TO/ FROM TU/IF 72 100 70 VCR 'H' VOICE 'H' PLL DATA PLL CLK CV OUT AFT 71 52 63 POWER FAIL 78 A. MUTE 'H' A. ENV A. H.SW REC 'H' 74 68 71 72 CLK DATA 74 69 50 REC 'H' S clk S in S out OSD 'H' 8 19 67 66 65 Hi-Fi ONLY 2 GND Vcc 3 IC505 1 C577 + R589 TO AUDIO '00.10.20 R10380BB OPTION : Speak EZ Model Only IC5F1 DISPLAY w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-30 3-31 CIRCUIT DIAGRAMS 1. Power Circuit Diagram NOTES) Symbol denotes AC ground. NOTES) Symbol denotes DC chassis ground. NOTE) Warning NOTE) Parts that are shaded are critical NOTE) With respect to risk of fire or NOTE) electricial shock. BD101, R101 are defective. Power is dead. F101 is defective. Power dead. IC101 is defective. Switching dead. D102 is defective. No power. D106 is defective. No 5.3VA and 5.1V. No 12VA and 12V. D109, C120 are defective. IC102, IC103 are defective. Power dead. NOTE : 1. Shaded( ) parts are critical for safety. Replace only with specified part number. 2. Voltages are DC-measured with a digital voltmeter during TUNER mode. w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-32 3-33 2. Tuner, NICAM, A2 Circuit Diagram EE MODE(VIDEO) TU MODE (AUDIO) w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-34 3-35 3. A/V Circuit Diagram 1 4 5 2 7 8 13 11 12 2 3 9 10 14 6 2 PB SECAM COLOR REC AUDIO PB Y+C PB Y PB C REC Y+C REC Y REC C REC SECAM COLOR PB AUDIO(MONO) WAVEFORM Audio Tracking is failed. IC301 Pin 84 is defective. PB COLOR Signal disappear. IC301 Pin70 is defective. PB COLOR Signal disappear. X301 is defective. D301 or IC301 Pin 80 REC is defective. PB and Recording is failed. (IC301 doesn’t operate.) IC301 Pin 69, 68 are defective. Normal Audio signal is not recorded. FL301, Q301, Q306 are defective. No mono Audio Signal in PB MODE. Q302, Q303, Q304 are defective. w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-36 3-37 4. System Circuit Diagram 1 2 3 4 9 5 6 7 8 WAVEFORM Speaker will not operate. IC201, X201 are defective. Blue back will not operate. X503 is defective. µ-COM will not operate. X502 is defective. Clock setting will not operate. X501 is defective. OSD will not operate. L511, R598, C595, C596 are defective. µ-COM is unstable. Q501, Q503 are defective. Remote control is Pulse coil not Receive. RC501 is defective. VCR will not operate. IC505 is defective. Deck will not operater R575, R576, R577, R578 are defective • Reset is defect. • Set dead. IC504 is defective. Auto stop occurs. RS501, RS502 are defective. Auto rew will not working. ES501, Es502, LD501 are defective. OSD is unstable. R597, C590, C589 are defective. w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-38 3-39 5. Hi-Fi Circuit Diagram (Hi-Fi Model) RF Hi-Fi NORMAL AUDIO V.out V.in All Audio is not appear. IC801 42, 43 Pins are defective. w w w . x i a o y u 1 6 3 . c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 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 3-40 3-41 WAVEFORM @@@@@@@@@@he?@@?he?@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@he?@@?he?@(Me?I'@@@e@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@g?@@@@@@@heW2@6X?fW2@6X?e?@@@f?@@@e?W2@@@6Xg?@@? ?W2@hf@@ @@f?W2@@6X?e?@@??W2@g?@H?W26KV@@5e@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@g?@@@@@@@h?W&(?')Xe?W&(?')Xe?@@@L?eJ@@@e?7@(MI4)gJ@5? W&@@he?J@@L? @@fW&@@@@)Xe?@@?W&@5g?@e7@@@@@@?f@@@(M??I'@@@@?I'X?I'@@@@e@@g?@ ?7@H?N@1e?7@H?N@1e?@?@1?e7Y@@e?@@Hhe7@H??W2@@6X? ?W.Y@@he?7@@1?f?W2@@6X??W2@@@@@eW2@@6X @@f7@(MI'@1e?@@W&@(Yg?@L?@@@@@@@1e@@@@(YW26XV'@@@??S@6XV'@@@e@@g?@ ?@@?e@@e?@@?e@@e?@?@@?e@?@@e?3@?h?J@5e?7@?I4)? 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