LG LH-C6230P, Service Manual

Page 1: ... C6230P C6231P LGEDG LGEES LGEPT LGEIS LH C6230S LGEFS STUH LH C6230W LGESA LGEGF LH C6231W LGEAP LH C6230X MOSCOW LH C6230Y C6231Y LGEPL LGEMK P N 3829RDT033C JULY 2003 SERVICE MANUAL MODELS LH C6230P C6231P LH C6230S LH C6230W LH C6231W LH C6230X LH C6230Y C6231Y ...

Page 2: ...CR PART ELECTRICAL ADJUSTMENT PROCEDURES 3 1 VCR ELECTRICAL TROUBLESHOOTING 3 2 VCR SHEMATIC DIAGRAMS 3 17 VCR VOLTAGE SHEET IC TR 3 29 PRINTED CIRCUIT DIAGRAMS 3 31 SECTION 4 MECHANSIM OF VCR PART 4 1 SECTION 5 DVD PART DVD ELECTRICAL TROUBLESHOOTING 5 1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 5 7 DVD PART SCHEMATIC DIAGRAMS 5 21 VOLTAGE SHEET IC TR 5 29 PRINTED CIRCUIT DIAGRAM 5 31 SE...

Page 3: ...NOT EMIT X RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC OPERA TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC TURE TUBE OR HIGH VOLTAGE SUPPLY AND UNDER CERTAIN CIR CUMSTANCES MAY PRODUCE RADIATION IN EXCESS OF DESIR ABLE LEVELS 2 ONLY FACTORY SPECIFIED C R T ANODE CONNECTORS MUST BE USED DEGAUSSING SHIELDS ALSO SERVE AS ...

Page 4: ...eams may damage the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the lens surface therefor...

Page 5: ...e replacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench should be covered with a conductive sheet and grounded When removing the laser pick up from its conductive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent...

Page 6: ... 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 com...

Page 7: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparabl...

Page 8: ... 1 0 V p p 75 ohms negative sync Mini DIN 4 pin x 1 C 0 3 V p p 75 ohms VCR Section Head system 4 heads helical scan azimuth system Maximum recording time SP 4 h E 240 tape LP 8 h E 240 tape Rewind time About 180 min E 180 tape Input level VIDEO 1 0 V p p 75 ohms unbalanced AUDIO 6 0 dBm more than 10 kohms SCART 6 0 dBm more than 47 kohms RCA Output level VIDEO 1 0 V p p 75 ohms unbalanced Signal ...

Page 9: ... Rated Input Power 20W Max Input Power 40W Net Dimensions W x H x D 88 x 100 x 95 mm Net Weight 0 54 kg Passive Subwoofer LHS C6230W Type 1 Way 1 Speaker Impedance 8 Frequency Response 50 1 500 Hz Sound Pressure Level 82 dB W 1m Rated Input Power 40W Max Input Power 80W Net Dimensions W x H x D 160 x 350 x 325 mm Net Weight 4 12 kg ...

Page 10: ... 2 1 SECTION 2 AUDIO PART ...

Page 11: ...fference which is from the selected A B Head point of the H SW W373 W374 signal to the starting point of the vertical synchronized signal to 6 5H 0 5H 416 s 1H 64 s PG Adjustment Method a 1 Payback the SP standard tape b 2 Press the 1 key on the Remote controller and the PLAY key on the Front Panel the same time then it goes in to Tracking initial mode Note PAL Model 1 key on Remote controller c 3...

Page 12: ... 3 2 VCR ELECTRICAL TROULBESHOOTING ...

Page 13: ... 3 3 ...

Page 14: ... Refer to SMPS 5 3VA troubleshooting Check the IC501 Pins68 69 70 71 Do T UP Reel Pulses appear at the Q514 Base terminal Replace the T UP Reel Sensor RS501 Check the CST SW and the peripheral circuitry Replace the IC501 The unstable loading of a Cassette tape Does the H signal appear at the IC501 Pin30 during inserting the CST Does the L signal appear at the IC501 Pin72 during inserting the CST C...

Page 15: ...e Drum Motor 2 doesn t run Do the DFG Pulses appear at the PMC01 Pin11 Replace the Cap M Aren t the foil patterns and the Components between IC501 Pin104 and PMC01 Pin11 short Replace the IC501 Refer to 2 No 12VA of Power section Do the Drum PWM Pulses appear at the IC501 Pin107 Aren t the foil patterns and the Components between IC501 Pin107 and PMC01 Pin12 short Do the DFG Pulses appear at the I...

Page 16: ...C501 Pin108 and PMC01 Pin9 short Does the CFG signal come into the IC501 Pin9 Aren t the foil patterns and Components between IC501 Pin108 and PMC01 Pin9 short 3 When the Capstan Motor doesn t run NO NO NO YES YES YES When the Capstan Motor doesn t run Does 12VA appear at the PMC01 YES Replace the IC501 YES NO NO YES Refer to SMPS CAPSTAN 12Volt Trouble Shooting Aren t the foil patterns and compon...

Page 17: ... KEY doesn t working KEY doesn t working Is 5V applied to the IC501 Pin36 Does LED or FLD change when a function button is pressed Refer to SMPS 5 3VA Trouble Shooting Replace the defective switches YES NO NO ...

Page 18: ...gnal appear at the Emitter termi nal of the Q307 Q308 Check the 5 2VT 5 3VA Line Power Circuit Is I2 C BUS signal applied to the IC301 Pins68 69 Check C316 AGC Chck the path of the signal between the IC301 Pin65 and IC501 Pin17 Replace the IC301 Does the 12VT 5 3VA appear at the Emitter termi nal of the Q804 Q308 Replace the Q804 Q308 Check the 12VT 5 3VA Line Power Circuit Check the System Circui...

Page 19: ...05 Check the V H S W level Check R303 R304 Replace the IC301 Refer to SYSTEM I2 C BUS CHECK Trouble Shooting Is the V H S W signal applied to the IC301 Pin70 Is V H S W H about 3 4V at the IC301 Pin70 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 Pin76 Is the Y Lumi...

Page 20: ...e of the 5 2VT 5 3VA Line Power Circuit Replace the X301 Check the Color Pass Check the Color Rotary Circuit IC501 Pin99 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 Pin21 Is Color Rotary H about 3 4V Replace the IC301 NO NO NO YES YES YES YES NO NO NO YES Does the Color signal appear at the IC301 Pin25 ...

Page 21: ...tem of REC H the IC501 Pin47 the D301 Replace the IC301 Check the line of the 5 2VT 5 3VA Line Power Circuit Check PB Mode Is the REC H signal about 4V applied to the IC301 Pin80 Check the circuit of the IC301 Pins85 86 Check REC Luminance Pass Color Pass Does PB Mdoe operate normally Does the REC RF signal appear at the IC301 Pins88 89 94 95 Check the Drum Drum Connector YES YES YES YES YES NO NO...

Page 22: ...Pin4 YES Check the IIC Clock and DATA at IC801 Pins42 43 IC802 Pins32 33 YES Check the Audio of IC801 Pins16 17 YES Check the Audio of IC802 Pins22 26 YES Check the JK801 Check the IC751 Pins30 31 NO Check the DVD MODULE P8D01 Pins3 5 NO Check the Scart1 Jack SC901 Scart1 Audio in Pins2 6 NO Check the front Jack PM602 Pins3 5 Check the Scart2 Jack SC901 Scart2 Audio in Pins2 6 NO NO Check the Powe...

Page 23: ... Signals appear at IC801 Pin16 L CH 17 R CH YES Do Audio Signals appear at IC802 Pin10 L CH 16 R CH YES YES YES Do Audio Signals appear at IC802 Pins22 26 Do Audio Signals appear at JK801 Check Power 5 2V 12VT NO Check IC501 Pin25 A H SW NO NO Check the parts of COM IC501 Pins59 60 NO Check the Connection at P3D01 Pins7 9 NO Check the A IN line of IC802 C808 C809 NO Check the Vcc of IC802 Pin4 Rep...

Page 24: ...CLOCK YES Do Audio signals appear at IC801 Pins16 17 YES Do FM Audio signals appear at IC801 Pin36 YES Check the Contact Point of Drum Connector if good then Replace the Drum YES Check Power 5V 12VT NO Check ports of COM Check Audio input signal of IC801 Pins2 3 TU A 4 5 DVD A 6 7 AVI A 8 9 AV2 A 10 11 AV3 A NO Replace IC801 NO NO ...

Page 25: ...NO NO Does the Video signal at the IC802 Pin30 Check the signal flow from IC802 Pin30 to SC901 Pin19 YES Check 33V line NO Check 5V line NO YES Does the Clock signal appear at TU701 Pin11 Check the lIC Clock Signal of COM Pin59 NO YES Does the data signal appear at TU701 Pin12 Replace Tuner Check the signal flow from TU701 Pin24 to IC301 Pin48 Check the signal from IC301 Pin65 to IC501 Pin17 Check...

Page 26: ...801 Pins2 3 YES Check the Audio of IC801 Pins16 17 YES Check the Audio of IC802 Pins22 26 YES Check the Signal flow from IC802 Pins22 26 SC901 Pins1 3 YES Check the Tuner SIF of TU701 Pin22 NO Replace X751 NO Check the IIC Clock and Data at IC751 Pins12 13 NO Check the signal flow from IC751 Pins30 31 to IC801 Pins2 3 NO Check the IIC Clock and Data at IC801 Pins42 43 NO Check the signal flow from...

Page 27: ... 5 1 DVD ELECTRICAL TROUBLESHOOTING 1 Test debug flow SECTION 5 DVD PART ...

Page 28: ... 5 2 ...

Page 29: ... 5 3 ...

Page 30: ... 5 4 ...

Page 31: ... 5 5 ...

Page 32: ... 5 6 ...

Page 33: ... 5 7 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1 SYSTEM 27MHz CLOCK RESET FLASH R W SIGNAL 1 MT1379 main clock is at 27MHz X501 2 MT1336 reset is high active ...

Page 34: ... 5 8 3 RS232 waveform during procedure Downloading 4 Flash R W enable signal during download Downloading ...

Page 35: ... 5 9 2 SDRAM CLOCK 1 MT1379 main clock is at 27MHz X501 3 TRAY OPEN CLOSE SIGNAL 1 Tray open close waveform ...

Page 36: ... 5 10 2 Tray close waveform 3 Tray open waveform ...

Page 37: ... 5 11 4 SLED CONTROL RELATED SIGNAL NO DISC CONDITION 5 LENS CONTROL RELATED SIGNAL NO DISC CONDITION ...

Page 38: ... 5 12 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION 7 DISC TYPE JUDGEMENT WAVEFORM ...

Page 39: ... 5 13 ...

Page 40: ... 5 14 8 FOCUS ON WAVEFORM ...

Page 41: ... 5 15 9 SPINDLE CONTROL WAVEFORM NO DISC CONDITION ...

Page 42: ... 5 16 10 TRACKING CONTROL RELATED SIGNAL System checking ...

Page 43: ... 5 17 11 RF WAVEFORM 12 MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT ASPDIF ...

Page 44: ... 5 18 13 MT1379 VIDEO OUTPUT WAVEFORM 1 Full colorbar signal CVBS 2 Y ...

Page 45: ... 5 19 3 C 14 AUDIO OUTPUT FORM AUDIO DAC 1 Audio related Signal ...

Page 46: ... 5 20 MEMO ...

Page 47: ...AL 150M 855 6871RU9271A PWB PCB ASSEMBLY SUBSET AUDIO LHS D6230T FRONT WIRE 5M R CH 856 6871RU9271B PWB PCB ASSEMBLY SUBSET AUDIO LHS D6230T FRONT WIRE 5M L C 857 6871RU9271C PWB PCB ASSEMBLY SUBSET AUDIO LHS D6230T CENTER WIRE 5M G 858 6871RU9271D PWB PCB ASSEMBLY SUBSET AUDIO LHS D6230T REAR WIRE 10M R CH 859 6871RU9271E PWB PCB ASSEMBLY SUBSET AUDIO LHS D6230T REAR WIRE 10M L C 861 353M025V SCR...

Page 48: ...FRONT LH 6230WE STANDARD 852 3701RM0043A NET ASSEMBLY SPK LHS D6230W SILVER STANDARD 853 3091RMW050A CABINET ASSEMBLY ASSY LH 6230WE ALL PB 9T 854 6400WTTJ03A SPEAKER WOOFER F65C D365 TOPTONE WOOFER LHS 6 855 6871RU9271F PWB PCB ASSEMBLY SUBSET AUDIO LHS D6230W SUB WOOFER 2 5M OR 861 353M050C SCREW BH 3 5X16 FBK RUN DATE 05 JUNE 2003 7 4 ...

Page 49: ...2 2 2 3 BLOCK DIAGRAM ...

Page 50: ...2 4 2 5 AUDIO SHEMATIC DIAGRAMS U COM SCHEMATIC DIAGRAM ...

Page 51: ...2 6 2 7 FUNCTION POWER SCHEMATIC DIAGRAM ...

Page 52: ...2 8 2 9 MAIN AMP SCHEMATIC DIAGRAM ...

Page 53: ...2 10 2 11 WIRING DIAGRAM ...

Page 54: ... KA78R12 1 18 4 18 4 2 12 12 3 0 0 4 5 5 IC706 KIA7805 1 11 11 2 0 0 3 5 5 IC705 KIA7805 1 11 11 2 0 0 3 5 5 D507 D5402 ANODE 0 2 0 2 CATHODE 11 11 D511 D5402 ANODE 0 2 0 2 CATHODE 11 11 BD501 KBU6G 1 18 6 18 6 2 0 0 3 0 0 4 18 4 18 4 IC101 KIA4580 1 4 5 4 5 2 4 5 4 5 3 4 5 4 5 4 0 0 5 4 5 4 5 6 4 5 4 5 7 4 5 4 5 8 9 9 IC102 CS5331A 1 1 4 1 4 2 1 6 1 6 3 1 6 1 6 4 1 5 1 5 5 2 2 2 2 6 0 0 7 5 5 8 2...

Page 55: ...2 14 2 15 PRINTED CIRCUIT DIAGRAM MAINAMP FRONT P C BOARD SOLDER SIDE ...

Page 56: ...2 16 2 17 MAINAMP FRONT P C BOARD COMPONENT SIDE ...

Page 57: ...2 18 2 19 FUNCTION POWER P C BOARD SOLDER SIDE ...

Page 58: ...2 20 2 21 FUNCTION POWER P C BOARD COMPONENT SIDE ...

Page 59: ...3 17 3 18 VCR SHEMATIC DIAGRAMS SYSTEM SCHEMATIC DIAGRAM ...

Page 60: ...3 19 3 20 A AUDIO V VIDEO SCHEMATIC DIAGRAM ...

Page 61: ...rning Parts that are shaded are critical With respect to risk of fire or electrical shock NOTE 1 Shaded parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmefer during Play mode ...

Page 62: ...3 23 3 24 TU IF ACSS SCHEMATIC DIAGRAM ...

Page 63: ...3 25 3 26 HIFI TUNER SCHEMATIC DIAGRAM ...

Page 64: ...3 27 3 28 A V JACK SCART SCHEMATIC DIAGRAM ...

Page 65: ... 2 11 2 1 72 1 23 4 76 2 33 40 0 0 0 0 4 6 0 41 0 0 1 0 84 0 83 2 52 2 64 42 0 0 2 15 2 15 2 52 2 61 43 0 0 0 0 2 54 2 65 44 2 1 2 2 4 69 4 67 2 54 2 65 45 2 2 2 2 4 72 4 7 0 57 0 41 46 0 0 2 11 2 94 4 76 4 74 47 1 3 1 2 2 84 3 65 2 5 0 48 0 0 2 8 4 23 1 75 2 62 49 0 0 3 79 3 77 3 78 0 50 0 9 2 3 0 2 29 0 0 51 0 0 2 2 11 2 1 1 79 0 52 1 5 2 3 0 4 7 1 22 0 53 4 7 4 7 4 18 4 3 81 0 54 0 1 9 4 18 4 8...

Page 66: ...3 31 3 32 PRINTED CIRCUIT DIAGRAMS TUNER P C BOARD ...

Page 67: ...3 33 3 34 VCR P C BOARD ...

Page 68: ...3 35 3 36 VCR P C BOARD ...

Page 69: ...5 22 5 21 DVD PART SCHEMATIC DIAGRAMS MPEG SCHEMATIC DIAGRAM ...

Page 70: ...5 23 5 24 SERVO SCHEMATIC DIAGRAM ...

Page 71: ...5 25 5 26 AUDIO SCHEMATIC DIAGRAM ...

Page 72: ...5 27 5 28 INTERFACE SCHEMATIC DIAGRAM ...

Page 73: ...5 29 5 30 VOLTAGE SHEET IC TR ...

Page 74: ...5 31 5 32 PRINTED CIRCUIT DIAGRAM DVD P C BOARD SOLDER SIDE ...

Page 75: ...5 33 5 34 DVD P C BOARD COMPONENT SIDE ...

Page 76: ...5 A46 285 A47 250 330 276 A42B A42 284 277 267 A43 283 300 320 264 260 321 AUDIO TUNER CABINET AND MAIN FRAME NOTE Refer to SECTION 7 REPLACEMENT PARTS LIST in order to look for the part number of each part SECTION 7 EXPLODED VIEWS ...

Page 77: ...SECTION 4 MECHANSIM OF VCR PART ...

Page 78: ...Assembly P4 Chassis Embossing A 5 T 17 Opener Lid Chassis Embossing A 5 T 17 18 Arm Assembly Pinch Shaft A 5 T 17 19 Lever T Up Arm T Up 1 Hook A 5 T 17 18 20 Belt Capstan Motor Capstan 3 Screw A 6 B 21 Lever F R Locking Tab A 6 B 20 21 22 Clutch Assembly D35 Washer A 6 B 23 Brake Assembly Capstan Locking Tab A 6 B 24 Gear Drive Gear Cam Washer Hook A 7 B 25 Gear Sector 1 Hook A 7 B 20 21 23 26 Pl...

Page 79: ...te the Drum assembly 3 Unhook H1 H2 and separate the Holder FPC and Cap FPC 1 1 Drum Motor 1 Remove two Screws S2 and disassemble the Stator of the Drum Motor 2 Remove two Screws S3 and separate the Rotor of the Drum Motor from the Drum Sub assembly NOTE When reassembling confirm A portion of the Drum Sub assembly whether the Carbon Brush is in there or not Fig A 1 Fig B 1 Holder FPC Drum FPC Cap ...

Page 80: ...te Top Arm Assembly F L Spring Lever S W Gear Assembly Rack F L Chassis Opener Door Bracket Assembly L D Motor Holder Assembly CST B C D E H6 A B Lever Assembly S W H8 Fig A 2 Fig A 2 1 Fig A 2 2 Fig A 2 6 Fig A 2 7 Fig A 2 5 Fig A 2 3 Fig A 2 4 ...

Page 81: ...oor Figure A 2 3 1 Turn the Opener Door clockwise and remove it through the guide hole of the Chassis 5 Bracket Assembly L D Motor Fig A 2 4 1 Unplug the Connector C1 2 Unhook three Hooks H3 H4 H5 on bottom side of the Chassis lift up the Bracket Assembly L M and disassem ble the Bracket Assembly L D Motor 6 Gear Assembly Rack F L Fig A 2 5 1 Move the Gear Assembly Rack F L in direction of arrow A...

Page 82: ...e direction and lift it up 10 Head F E Fig A 3 2 1 Breakaway the A portion of the Head F E from the embossing of the Chassis turn it to counterclockwise direction and lift it up 11 Base Assembly A C Head Fig A 3 3 1 Remove the Screw S4 and lift the Base Assembly A C Head up A Arm Assembly Cleaner Base Assembly A C Head S4 Head F E A Chassis Fig A 3 Fig A 3 1 Fig A 3 3 Fig A 3 2 ...

Page 83: ...3 Brake Assembly RS Fig A 4 2 1 Unhook the Spring RS from the Hook H10 of the Chassis 2 Lift the Brake Assembly T up 14 Arm Assembly Tension Fig A 4 3 1 Unhook the Spring Tension from the Hook H11 of the Arm Assembly Tension 2 Unhook the Hook H12 of the Base Tension and lift the Arm Assembly Tension up NOTE Difference for Springs 15 Reel S Reel T Fig A 4 4 1 Difference for Reel S Reel T Spring TB ...

Page 84: ...ner Lid Fig A 5 2 1 Breakaway the B portion of the Opener Lid from the embossing of the Chassis 2 Turn the Opener Lid to clockwise direction and lift it up 18 Arm Assembly Pinch Fig A 5 3 1 Lift the Arm Assembly Pinch up NOTE When reassembling confirm the C portion of the Arm Assembly Pinch is inserted to the Chassis hole correctly as Fig 19 Lever T up Fig A 5 4 Arm T up Fig A 5 5 1 Unhook the Hoo...

Page 85: ...Capstan 2 Remove the three Screws S5 on bottom Chassis and lift the Motor Capstan up 21 Lever F R Fig A 6 3 1 Unlock the Locking Tab L1 as Fig A 6 3 and lift the Lever F R up 22 Clutch Assembly D35 Fig A 6 4 1 Remove the Washer W1 and lift the Clutch Assembly D35 up 23 Brake Assembly Capstan Fig A 6 5 1 Pull the Locking Tab L2 back in direction of arrow and lift it up Fig A 6 1 Fig A 6 2 Fig A 6 3...

Page 86: ...and the Gear Cam Hole B in a straight line after the Gear Drive Hole C is aligned with the Chassis Hole as Fig 25 Gear Sector Fig A 7 3 1 Unhook the Hook H15 of the Base Loading on bottom Chassis and lift the Gear Sector up 26 Plate Slider Fig A 7 4 1 Just lift the Plate Slider up 27 Lever Tension Fig A 7 5 1 Unhook the A portion of the Lever Tension from the Hook H16 of the Chassis 2 Turn the Lev...

Page 87: ...y P3 up NOTE When reassembling align the two holes of the Gear Assembly P2 and P3 in a straight line after confirmation whether the Gear Sector Hole A and the Plate Slider Hole B are aligned or not as Fig 30 Base Assembly P2 Fig A 8 3 Base Assembly P3 Fig A 8 4 1 Move the Base Assembly P2 in direction of arrow A along the guide hole of the Chassis and disassemble it on bottom side 2 Move the Base ...

Page 88: ...ion Fig A 9 2 1 Breakaway the A portion of the Base Tension from the embossing of the Chassis 2 Turn the Base Tension to counterclockwise direction and lift it up 33 Arm Assembly Idler Fig A 9 3 1 Make narrower the two parts B and C as Fig A 9 3 2 Lift the Arm assembly Idler up NOTE When disassembling be careful not to be caught the D part by the Chassis as Fig Fig A 9 1 Fig A 9 2 Fig A 9 3 ...

Page 89: ... 4 12 ...

Page 90: ... is as below Fig C 2 4 Remove the Screw which fixes the Deck Mechanism and Main Frame and confirm if the Gear Cam is aligned with the Gear Drive as below Fig C 1 A 5 Confirm if the Mode S W on the Main P C Board is aligned as below Fig C 1 B 6 Remount the Deck Mechanism on the Main P C Board and check each operation Gear Cam Gear Drive A Mode S W B L D Motor Assembly Gear Cam Chassis Hole Gear Cam...

Page 91: ...the Torque Gauge affixed NOTE The torque reading to measure occurs when the tape abruptly changes direction from Fast Forward to Rewind Mode when quick braking is applied to both Reels SRK VIDEO CASSETTE TORQUE METER VHT 303 S R K V H T S SRK V HT T 300 250 200 150 50 0 300 250 200 150 50 0 100 Test Equipment Fixture Torque Gauge 600g cm ATG Torque Gauge Adaptor Cassette Torque Meter SRK VHT 303 C...

Page 92: ...nvelope CH 2 NTSC SW 30Hz PAL SW 25Hz Head Switching Output Point RF Envelope Output Point Test Conditions VCR VCP State Play an Alignment Tape Adjustment Point Guide Roller Height Adjustment Screws Fig C 4 2 Fig C 4 3 P3 POST ADJUSTMENT P2 POST ADJUSTMENT Turn the Roller Guide Height Adjustment Screw slightly to flatten the waveform Tracking Control at center RF ENVELOPE OUTPUT TEST POINT OSCILLO...

Page 93: ...Screw Fig C 5 3 A C Head Tape Tape 0 2 0 25mm P4 5 1 Preliminary Adjustment Height and Tilt Adjustment Perform the Preliminary Adjustment when there is no Audio Output Signal with the Alignment Tape 1 Initially adjust the Base Assembly A C Head as shown Fig C 5 1 by using the Height Adjustment Screw B 2 Play a blank tape and observe if the tape passes accu rately over the A C Head without tape cur...

Page 94: ...ternately adjust the Azimuth Adjustment Screw A and the Tilt Adjustment Screw C for maximum output of the 1KHz and 7KHz segments while maintaining the flattest envelope differential between the two frequencies Adjustment Procedure 5 3 Precise Adjustment Azimuth adjustment 6 X Value Adjustment Fig C 5 4 1KHZ Oscilloscope Alignment Tape SP only Screw Driver Type 5mm CH 1 PB RF Envelope CH 2 NTSC SW ...

Page 95: ...nism Condition Play the Blank Tape Play an Alignment Tape Adjustment Points Guide Roller Precise Adjustment Switching Point Tracking Preset X Value Checking Adjustment Procedure Play a blank tape and check for tape curling or creasing around the Roller Guide If there is a problem then follow the procedure 4 Guide Roller Height and 5 Audio Control A C Head Adjustment RF ENVELOPE OUTPUT TEST POINT O...

Page 96: ...inch Roller NOTE If locations marked with o do not operate normally after cleaning check for wear and replace See the EXPLODED VIEWS at the end of this manual as well as the above illustrations and see the Greasing Page 4 21 22 for the sections to be lubricated and greased o o o o Dirt on Video Head Dirt on tape transport system Low volume Sound distorted Tape does not run Tape is slack o In Revie...

Page 97: ...video head First use a cleaning tape If the dirt on the head is too stubborn to remove by tape use the cleaning patch Coat the cleaning patch with Isopropyl Alcohol Touch the cleaning patch to the head tip and gently turn the head rotating cylinder right and left Do not move the cleaning patch vertically Make sure that only the buckskin on the cleaning patch comes into contact with the head Otherw...

Page 98: ...ding Path Inside Top side 2 Base Assembly P2 P3 stopper 3 Shaft 4 L D Motor Gear Wheel Part 5 Arm Take up Rubbing Sections 6 Reel S T shaft G381 Yellow 7 Arm Assembly F L Rotating Sections Guide Rail Base Loading Gear Drive Gear Sector Gear Cam Gear Part Chassis Left Side Chassis Right Side 5 7 8 1 2 6 4 3 Slider Guide Slider Guide 1 Loading Path Inside Top side 2 Base Assembly P2 P3 stopper 3 Sha...

Page 99: ... 4 22 MAINTENANCE INSPECTION PROCEDURE Lever F R Base Tension GEAR AY P2 P3 Lever F R Base Tension Arm Tension Guide Hole Clutch G 754 Yellow Boss Cam ...

Page 100: ...d sensor Check the syscon circuit NO YES YES YES YES NO NO 1 Deck Mechanism A NO NO NO No F R modes Is the present mode F R Mode Is the mode SW assembled correctly refer to page 4 13 Is the normal voltage supplied to the Capstan Motor Vcc1 Vcc2 Does terminal voltage Vctl of Capstan Motor supply side more than 4V Check the servo power circuits Replace the Capstan Motor Does the Capstan Motor rotate...

Page 101: ... 4 24 ...

Page 102: ...k Check the Syscon Circuit Check the Syscon Circuit Check the Servo Syscon Does the Capstan Motor turn Is the terminal voltage vctl of the Drum Motor more than 4V Replace the Drum Motor Is the Vcc voltage of the Drum Motor normal Check the Clutch and Idler Assembly YES YES YES YES YES YES YES YES NO NO NO NO NO Is the terminal voltage vctl of Capstan Motor supplied more than 4V Replace the Capstan...

Page 103: ... 5V YES Is there a short circuit between cassette switch and GND on main P C Board Remove the short circuit part or Replace the main P C Board NO Check the Mode switch location and syscon circuit Replace the CST IN Switch YES NO YES NO NO Replace the CST IN Switch NO NO Cassette does not eject Does the L D Motor rotate in reverse Check the L D Motor or Drive IC Replace the Lever Assembly Switch Do...

Page 104: ...Assembly F L Check the power of L D Motor Check the Holder Assembly Cassette assembled correctly Replace the Gear Rack F L Does the Gear Assembly Rack F L work Does the Opener Door work Does the Arm Assembly F L work Does the L D Motor work Does the Holder Assembly Cassette move the Arm Assembly F L Replace the Front Loading Mechanism Assembly YES YES YES YES NO NO NO YES NO YES NO YES NO C ...

Page 105: ... 4 28 EXPLODED VIEWS 117 103 105 117 100 106 107 A21 114 113 112 110 115 A24 116 102 A23 032 A22 109 054 054A 100A 100B 1 Front Loading Mechanism Section ...

Page 106: ...EWS 401 402 001 008 011 031 079 017 032 024 406 020 021 028 019 018 029 030 026 A03 A04 A01 002 002A 025 027 022 003 004 006 007 010 405 014 015 009 409 013 023 016 405 012 402 OPTIONAL PART 2 Moving Mechanism Section 1 ...

Page 107: ... 4 30 EXPLODED VIEWS 051 052 517 061 056 058 518 052A 055 060 410 070 069 076 032 077 068 064 066 065 067 A11 078 A12 OPTIONAL PART 3 Moving Mechanism Section 2 ...

Page 108: ...6 2 1 1 3 Clamp Upper 6 2 2 Tray Disc 6 2 3 Base Assembly Sled 6 3 3 1 Gear Assembly Feed 6 3 3 2 Gear Assembly Middle 6 3 3 3 Gear Assembly Rack 6 3 4 Rubber Rear 6 3 5 Frame Assembly Up Down 6 4 6 Belt Loading 6 4 7 Gear Pulley 6 4 8 Gear Loading 6 4 9 Guide Up Down 6 4 10 PWB Assembly Loading 6 4 11 Base Main 6 4 EXPLODED VIEW 1 Deck Mechanism Exploded View 6 5 CONTENTS SECTION 6 MECHANISM OF D...

Page 109: ...r Rear Frame Assembly Up Down Belt Loading Gear Pulley Gear Loading Guide Up Down PWB Assembly Loading Base Main 2 Screws 2 Locking Tabs 4 Screws 1 Screw 1 Screw 1 Locking Tab 1 Locking Tab 1 Locking Tab 1 Hook 2Screw 6 1 6 1 6 1 6 1 6 1 6 2 6 3 6 3 6 3 6 3 6 3 6 4 6 4 6 4 6 4 6 4 6 4 6 4 Bottom Bottom Procedure Parts Fixing Type Fig ure Disass embly Note When reassembling perform the procedure in...

Page 110: ...te the Clamp Assembly Disc from the Holder Clamp 1 1 1 Plate Clamp 1 Turn the Plate Clamp to counterclockwise direction and then lift up the Plate Clamp 1 1 2 Magnet Clamp 1 1 3 Clamp Upper 2 Tray Disc Fig 6 2 1 Insert and push a Driver in the emergency eject hole A at the right side or put the Driver on the Lever B of the Gear Emergency and pull the Lever B in direction of arrow so that the Tray ...

Page 111: ...ECHANISM DISASSEMBLY 3 Base Assembly Sled Fig 6 3 1 Release 4 Screw S2 2 Disconnect the FFC Connector C1 3 1 Gear Assembly Feed 3 2 Gear Middle 3 3 Gear Assembly Rack 1 Release the Scerw S3 4 Rubber Rear Fig 6 3 ...

Page 112: ... Unlock the Locking Tab L4 in direction of arrow B and then separate the Gear Pulley from the Base Main 8 Gear Loading Fig 6 4 9 Guide Up Down Fig 6 4 1 Move the Guide Up Down in direction of arrow A as Fig A 2 Push the Locking Tab L5 down and then lift up the Guide Up Down to separate it from the Base Main When reassembling place the Guide Up Down as Fig C and move it in direction arrow B until i...

Page 113: ......

Page 114: ...echanism Exploded View 429 429 026 010 018 013 014 017 015 015A 011 430 431 011A 012 004 001 002 003 A01 A02 020 430 430 430 430 012 021 433 433 012 012 028 022 432 024 A03 A26 025 030 015B 015C 435 029 031 431 431 431 024A 024A 024B ...