LG GC260W Service Manual

Text of LG GC260W User Guide:

• LG GC260W, 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

• LG GC260W, Purpose of adjustment : To make tools normally operate by positioning tools accurately. DECK MECHANISM ADJUSTMENT 4-13 1) Turn the VCR on and take the tape out by pressing the eject button. 2) Separate both top cover and plate top, and check both the hole (A) of gear cam and the hole (A’) of chassis cor- respond (Fig. C-2). 3) If it is done as in the paragraph 2): Turn the gear cam as in No.2) after mantling the motor assembly L/D. 4) Undo the screw fixing the deck and the main frame, and separate the deck assembly. Check both the hole (A) of gear cam and the hole (A’) of chassis correspond (Fig. C-1). 5) Check the mode S/W on the main P

• 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

• LG GC260W, 5-4 S AL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS C305 0CH1103K512 CAPA,CHIP CERAMIC M/L H.D F/S 0.0100UF 50V K B 1608 R/TP C306 0CH1102K512 CAPACITOR,FIXED CERAMIC(TEMP.C 1000PF 50V 10% B(5YP) 1608 R/T C307 0CE1054K638 CAPACITOR,ELECTROLYTIC 1.0M SRA/SS50V M FM5 TP(5) C308 0CQ1532K409 CAPACITOR,FIXED FILM 0.015UF S 50V 5% PE TP5 C309 0CH1221K562 CAPACITOR,FIXED CERAMIC(TEMP.C 220PF 50V 10% X7R(X) 1608 R/TP C310 0CN2210K518 CAPACITOR TUBULA(HIGH DIELE) 220P 50V K B TA26 C311 0CE3364F638 CAPACITOR,ELECTROLYTIC 33M SRA 16V M FM5 TP(5) C312

• LG GC260W, 5-34 S AL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS R307 0RH2201C622 RESISTOR,METAL GLAZED(CHIP) 2.2K OHM 1 / 16 W 1608 5.00% D R308 0RH4701C622 RESISTOR,METAL GLAZED(CHIP) 4.7K OHM 1 / 16 W 1608 5.00% D R309 0RH1201C622 RESISTOR,METAL GLAZED(CHIP) 1.2K OHM 1 / 16 W 1608 5.00% D R310 0RH4701C622 RESISTOR,METAL GLAZED(CHIP) 4.7K OHM 1 / 16 W 1608 5.00% D R311 0RH1001C622 RESISTOR,METAL GLAZED(CHIP) 1K OHM 1 / 16 W 1608 5.00% D R312 0RH5602C622 RESISTOR,METAL GLAZED(CHIP) 56K OHM 1 / 16 W 1608 5.00% D R313 0RH1000C622 RESISTOR,METAL GLAZED(CHIP) 100 OHM 1 / 16 W 1608 5.00% D R314 0RH1002C622 RESISTOR,METAL GLAZED(CHIP) 10K OHM 1 / 16 W 1608 5.00%

• LG GC260W, Checking/Adjustment Procedure 1) Play the blank tape (empty tape) and check whether the guide roller crumbles or wrinkles the tape and adjust it if necessary. 2) Check that the RF envelope output waveform is flat, and adjust the height of the guide roller while playing the standard test tape. 3) Adjust the switching point. 4) Check the RF envelope output is the maximum when the tracking control locates at the center. If not maxi- mum, set up to ensure that RF envelope output becomes the maximum by turning the (+) type driver (Ø 3 ~ Ø 4) on the base A/C groove. 4-18 DE

• LG GC260W, 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.

• LG GC260W, DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM 4-3 (B) (E) (C) Plate Top Arm Assembly F/L Gear Assembly Rack F/L Opener Door Holder Assembly CST (B') (H3) (A) (B) Lever Assembly S/W (H4) (E) Fig. A-2 (Fig. A-2-1) (Fig. A-2-2) (Fig. A-2-5) (Fig. A-2-6) (Fig. A-2-3) (Fig. A-2-4)

• LG GC260W, 3-40 3-41 WAVEFORM IC301 Pin 20 PB mode 500mvp-p IC301 Pins 38,32,31 38, 38 Video in 1Vp-p IC301 Pin 28 PB/REC mode 4.0Vp-p IC301 Pin 7 REC mode 1.1Vp-p IC301 Pin 6 REC mode 2.0Vp-p IC301 Pin 29 PB mode 2.02Vp-p IC301 Pin 41 PB mode 400mVp-p IC301 Pin 64 PB mode 400mVp-p IC301 Pin 23 PB/REC mode 5Vp-p IC301 Pin 24 PB/REC mode 5Vp-p IC301 Pins 71 72 REC mode 340mVp-p IC301 Pins 51 54 PB mode 300mVp-p IC301 Pin 63 PB mode 400mVp-p IC301 Pin 11 PB mode 3.6Vp-p _ IC301 Oscilloscope Waveform _ IC501 Waveform photographs IC501 Pin 14 1V/5mS REC/PB modes (V.H/SW) IC501

• LG GC260W, 4-2 DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM Cap, FPC Drum Assembly Cable Flat (S1) (S1) (S1) Holder FPC H1 H2 1. Disassembly of Drum Assembly (Figure A-1) 1) Separate cable flat from the Drum FPC and the Capstan Motor. 2) Release 3 screws (S1) on the bottom side of the chassis, and separate the drum assembly. 3) Release the hooks (H1, H2) and separate both the holder FPC and the Cap FPC (disassemble if necessary). Fig. A-1 Cautions in assembly of FPC Holder FPC Drum FPC Cap FPC Assembly shape seen in the reverse direction

• LG GC260W, 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

• 5-29 S AL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS C503 0CE4775C638 CAPACITOR,FIXED ELECTROLYTIC 470UF SR,SV 6.3V 20% FM5 TP 5 C508 0CH1223K942 CAPACITOR,CHIP[CERAMIC M/L HD 0.022UF 50V Z Y5V(F) 1508 R/TP C511 0CH1223K942 CAPACITOR,CHIP[CERAMIC M/L HD 0.022UF 50V Z Y5V(F) 1508 R/TP C512 0CC1200K415 CAPACITOR,FIXED CERAMIC(TEMP.C 12PF D 50V 5% TR NP0 C513 0CC15

• LG GC260W, 5-19 S AL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS D701 0DD133009AA DIODE,SWITCHING 1SS133 DETECT,SW TP D702 0DD133009AA DIODE,SWITCHING 1SS133 DETECT,SW TP ES501 4931R-0078C HOLDER ASSEMBLY VCR DECK/MECHA END(S) ES502 4931R-0078C HOLDER ASSEMBLY VCR DECK/MECHA END(S) F101 0FS1601B51D FUSE,SLOW BLOW 1600MA 250 V 5.2X20 CY/GL KS/J F101 585-011T FUSE,SLOW BLOW 1600MA 250 V 5.2X20 CY/GL SEMK FH01 586-008B HOLDER FUSE CLIP TP SINSUNG FH02 586-008B HOLDER FUSE CLIP TP SINSUNG IC101 0IPMGSK003A IC,POWER MANAGEMENT STR-A6351 SANKEN 8 DIP ST SMPS IC102 657-063A SENSOR LTV-817B,PHOTO

• LG GC260W, DISASSEMBLY AND ASSEMBLY OF DECK MECHANISM 4-9 Gear Drive Washer (W2) Gear Cam Plate Slider Lever Tension Lever spring Base Loading Gear Sector (B) (A) (H10) (W2) (L2) (H11) Chassis Gear Cam Hole(C) Gear Cam Hole(B) Gear Drive Hole(A) Brake Assembly Capstan Lever Brack Fig. A-7 24. Gear Drive (Fig. A-7-1)/ Gear Cam (Fig. A-7-2) 1) Remove the washer (W2) and then disassemble the gear drive. 2) Release the hook (H10) of the gear cam and then disas- semble it upward. CAUTIONS For the assembly, adjus

• LG GC260W, 5-35 S AL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS R518 0RH1000C622 RESISTOR,METAL GLAZED(CHIP) 100 OHM 1 / 16 W 1608 5.00% D R519 0RH1000C622 RESISTOR,METAL GLAZED(CHIP) 100 OHM 1 / 16 W 1608 5.00% D R520 0RH1000C622 RESISTOR,METAL GLAZED(CHIP) 100 OHM 1 / 16 W 1608 5.00% D R521 0RH1002C622 RESISTOR,METAL GLAZED(CHIP) 10K OHM 1 / 16 W 1608 5.00% D R522 0RH1001C622 RESISTOR,METAL GLAZED(CHIP) 1K OHM 1 / 16 W 1608 5.00% D R525 0RH1002C622 RESISTOR,METAL GLAZED(CHIP) 10K OHM 1 / 16 W 1608 5.00% D R526 0RH1002C622 RESISTOR,METAL GLAZED(CHIP) 10K OHM 1 / 16 W 1608 5.00% D R529 0RH1002C622 RESISTOR,METAL GLAZED(CHIP)

• LG GC260W, 1-6 SERVICE INFORMATION FOR EEPROM IC SETTING MODEL NAME HEX BINARY GC260W OPTION1 10 00000000 OPTION2 90 00000000 OPTION3 06 00000000 GC480W OPTION1 10 00000000 OPTION2 81 00000000 OPTION3 06 00000000 GC990W OPTION1 10 00000000 OPTION2 A1 00000000 OPTION3 0E 00000000 WR : OK I : EXIT MOVE : F G EDIT : DE 1. DETECT NEW EEPROM (OPTION EDIT SCREEN) - Eeprom EDIT screen automatically appears if replacing Eeprom. • Setup option data using the cursor Up/Down key of a remote control. (Setup upon BOM depending on OPT1~OPT3 model) • Since an initial remote control is set to LG for LG model,

• 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 Cir

• LG GC260W, 1-2 CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC- TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC- TION FROM A.C. LINE SHOCK. SAFETY CHECKS AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD

• 2. Disassembly of Plate Top (Fig. A-2-1) 1) Separate the right part while leaning back the (B) part of the plate top toward the arrow direction. 2) Separate the left part while leaning back the (B’) part of the plate top toward the arrow direction. (Tool used: Tool such as (-) driver, auger, etc with point- ed or flat end) CAUTIONS Assemble while pressing the (C), (C�

• LG GC260W, 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

• LG GC260W, 5-22 S AL LOCA. NO. PART NO. DESCRIPTION SPECIFICATION REMARKS R355 0RH4702C622 RESISTOR,METAL GLAZED(CHIP) 47K OHM 1 / 16 W 1608 5.00% D R356 0RH4701C622 RESISTOR,METAL GLAZED(CHIP) 4.7K OHM 1 / 16 W 1608 5.00% D R359 0RH4702C622 RESISTOR,METAL GLAZED(CHIP) 47K OHM 1 / 16 W 1608 5.00% D R360 0RH4701C622 RESISTOR,METAL GLAZED(CHIP) 4.7K OHM 1 / 16 W 1608 5.00% D R361 0RH1001C622 RESISTOR,METAL GLAZED(CHIP) 1K OHM 1 / 16 W 1608 5.00% D R3J1 0RH0000C622 RESISTOR,METAL GLAZED(CHIP) 0 OHM 1 / 16 W 1608 5.00% D R3S1 0RH0000C622 RESISTOR,METAL GLAZED(CHIP) 0 OHM 1 / 16 W 1608 5.00% D R3S2 0RH1801C622 RESISTOR,METAL GLAZ

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LG GC260W Operation & user’s manual 25-08-2023 16

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