LG FFH-185A Service Manual Download Page 16 | Manualshive

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SCHEMATIC DIAGRAMS

• MAIN SCHEMATIC DIAGRAM

2-11 2-12

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.

NOTE: Warning

Parts that are shaded are critical With respect
to risk of fire or electrical shock.

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Summary of Contents for FFH-185A

Page 1: ...OR CHECK POINT 2 8 BLOCK DIAGRAM 2 9 SCHEMATIC DIAGRAMS 2 11 WIRING DIAGRAM 2 19 PRINTED CIRCUIT DIAGRAMS 2 21 INTERNAL BLOCK DIAGRAM OF ICs 2 30 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 TAPE DECK MECHANISM AUTO STOP DECK OPTIONAL 3 3 TAPE DECK MECHANISM AUTO REVERSE DECK 3 5 CD MECHANISM 3 7 SECTION 4 SPEAKER 4 1 SECTION 5 REPLACEMENT PARTS LIST 5 1 ...

Page 2: ...be touched 4 Laser beams 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 l...

Page 3: ... 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 AC leakage the metal part of the soldering iron should be grounded 5 Workers should be grounded by an armband 1MΩ 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent static electricity changes in the clothing to escap...

Page 4: ...es 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 comparable co...

Page 5: ... 2 1 2 8 Frequency Response 3dB 60Hz 10kHz 9 Stereo Separation 100Hz 1kHz 10kHz 25dB 2 AM MW 1 Frequency Range 522kHz 1611kHz 2 Intermediate Frequency 455kHz 3 Usable Sensitivity 55dB m 4 Image Rejection 1404kHz 20dB 5 IF Rejection 603kHz 40dB 6 Selectivity 1008kHz 23dB 7 Signal to noise Ratio 1008kHz 35dB 8 Distortion 1008kHz 1 5 9 Frequency Response 1008kHz 100Hz 1800Hz 3 SW OPTIONAL 1 Frequency...

Page 6: ...aration Playback 1kHz 50dB 45dB 9 Erase Ratio 55dB 4 COMPACT DISC PLAYER SECTION 1 Frequency Response 40Hz 18kHz 0 5 3 0dB 2 Signal to noise Ratio 1kHz 70dB 3 Dynamic Range 1kHz 70dB 4 T H D 1kHz 0 2 5 Separation 100Hz 1kHz 10kHz 45dB 47dB 40dB 6 Access Time Short Long 2sec 6sec 5 GENERAL 1 Power requirement Refer to the back panel of unit 2 Power consumption 60W 3 Dimension W x H x D 180 x 248 x ...

Page 7: ...heck Power source voltage 2 Set the function switch to band being aligned 3 Turn volume control to minimum unless otherwise noted 4 Connect low side of signal source and output indicator to chassis ground unless otherwise specified 5 Keep the signal input as low as possible to avoid AGC and AC action Deck Mode Test Tape Test Point Adjustment Adjust for Palyback MTT 114 Speaker Out DECK Screw Maxim...

Page 8: ...MENT Figure 3 Tuner S curve Adjustment Connection Diagram Unit Signal Generator GND Electronic OSCILLOSCOPE FM Antenna Terminal Speaker Item Test Point Adjustment Adjust for DC Voltage Check Point TP1 TP2 L101 0V 50mV FM ...

Page 9: ...s power on Does initial read work Does it play Does it output audio Check power supply circuit Check PN 501 Check laser circuit Check focus circuit Check disc Check tracking servo circuit Check audio circuit OK YES YES YES YES NO NO NO NO ...

Page 10: ... flat Does signal appear at Test Pin TEO Does signal appear at IC 502 Pin and Pin Does GFS IC503 pin 25 show as below Is rotation normal Is there no dropout of RF signal Does TE2 signal appear at pin of IC501 Defective IC 801 pick up and or open wire Detective pattern Defective IC 501 and or IC 502 Defective pick up and or connector Defective IC 503 Scratch in disc initial read area Defective pick...

Page 11: ...C 502 pin Defective MICOM Defective MICOM Defective connector Defective IC 501 502 Defective slide motor and or connector Defective LMT SW and or connector Defective Q 501 and or laser Defective laser and or connector Did pickup return to innermost circular Does it stop at inner pick circular after shift Is defect output from LM SW applied to pin of PN503 R507 1 0V R507 1 0V YES YES YES YES OPEN C...

Page 12: ...isc Defective IC501 Defective IC502 Defective IC 501 Open activator and or connector Open connector and or defective IC 501 Incorrect turntable height Degraded laser diode Does Test Pin RF signal appear even in low level Is laser output adjustment correct Does FOK focus ok signal appear YES YES YES YES YES YES IC501 Pin RF IC501 pin FOK NO NO NO NO NO NO 48 13 16 40 74 ...

Page 13: ...ppear at pin of IC 503 Does SMPO signal appear at pin of IC 503 Is drive voltage applied to disk motor Defective IC 501 Open pick diode Defective IC 501 Defective Pattern between IC 501 and IC 502 Defective IC 501 502 and or peripheral circuit Defective disk motor and or insulation Focus servo turns ON by FZC signal of FOK mod NO NO NO NO YES YES YES YES YES 73 75 31 59 ...

Page 14: ...2 and TEO during track traverse 1 When time division is 20nS div 2 When time division 0 5nS div During forward track traverse 3 When time division is 0 5nS div During backward Track Traverse 5 Feed motor drive waveform pin NO 11 12 of IC 502 During normal play CH1 FOCUS COIL DRIVE SIGNAL 2V Div CH2 FOAK CH1 TEO Test Point 1V Div CH2 TRACKING COIL DRIVE SIGNAL 2V Div CH1 TEO Test Point 1V Div CH2 T...

Page 15: ...d parts are critical for safety Replace only with specified part number 2 Voltages are DC measured with a digital voltmefer during Play mode NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 16: ...2 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 NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 17: ...2 13 2 14 FRONT POWER SCHEMATIC DIAGRAM ...

Page 18: ... TUNER SCHEMATIC DIAGRAM 2 15 2 16 ...

Page 19: ... CDP SCHEMATIC DIAGRAM 2 17 2 18 ...

Page 20: ...WIRING DIAGRAM 2 19 2 20 NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 21: ...PRINTED CIRCUIT DIAGRAMS MAIN TUNER P C BOARD SOLDER SIDE 2 21 2 22 ...

Page 22: ... MAIN TUNER P C BOARD COMPONENT SIDE 2 23 2 24 ...

Page 23: ... FRONT POWER P C BOARD SOLDER SIDE 2 25 2 26 NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 24: ... FRONT POWER P C BOARD COMPONENT SIDE 2 27 2 28 NOTE Warning Parts that are shaded are critical With respect to risk of fire or electrical shock ...

Page 25: ... 2 29 CD MAIN P C BOARD LED P C BOARD ...

Page 26: ... 2 30 REC SW REC SW GND P B SW P B SW CONT GND GND VCC 1 2 3 4 5 6 7 8 9 BA3126N KIA6225P S INTERNAL BLOCK DIAGRAM OF ICs LA1837 ...

Page 27: ... 2 31 KIA7805 P PI KIA7815 P PI BU1923 FOR RDS RBDS ...

Page 28: ...h clock input 4 5 5 Q0 parallel data output 5 6 6 Q1 parallel data output 6 7 7 Q2 parallel data output 7 8 8 Q3 parallel data output 8 9 9 Q4 parallel data output 9 10 10 Q5 parallel data output 10 11 11 Q6 parallel data output 12 N C Not connected 13 N C Not connected 11 12 14 Q7 parallel data output 12 13 15 Q8 parallel data output 13 14 16 Q9 parallel data output 14 15 17 Q10 parallel data out...

Page 29: ... 2 33 TDA7265 BA3308 5V 18K 15K IN L 1µF 15K 1µF MUTE ST BY GND IN R 1µF 4 7Ω 4 7Ω 100nF 100nF OUT L OUT R 1000µF 1000µF VS 3 5 7 9 6 11 2 4 D94AU085 RL L RL R VS µP 560Ω 18K IN L 8 10 IN R 1 560Ω 18K ...

Page 30: ...ET CCB I F 1 2 LC72131 72131M TDA7440D L IN1 100K 100K 100K 100K 100K 100K 100K 100K 4 8 9 18 27 21 22 20 26 24 25 LOUT SCL SDA DIG_GND ROUT VS AGND RB RB 14 15 10 11 19 12 13 23 5 G G 6 7 3 2 INPUT MULTIPLEXER GAIN MUXOUTR INR TREBLE R BIN R BOUT R CREF D98AU883 0 30dB 2dB STEP MUXOUTL VOLUME TREBLE I CBUS DECODER LATCHES BASS SPKR ATT LEFT VOLUME TREBLE BASS SUPPLY VREF SPKR ATT RIGHT INL TREBLE...

Page 31: ...51 459 A26 459 459 301 310 305 A47 303 302 A00 454 454 A43 454 450 450 451 451 304 304 454 311 A46 454 272 274 257 A41 356 355 260 264 279 277 278 286 306 284 285 250 454 NOTE Refer to SECTION 5 REPLACEMENT PARTS LIST in order to look for the part number of each part ...

Page 32: ...81 4678 PIGEON SPRING CRL4 020 6768R BP01C 02 083 4188 PIGEON BELT FELT C 021 6768R LP01C 50 223 4429 PIGEON PULLEY FLYW 022 6768R VP01A 50 093 4125 PIGEON SOLENOID CW 023 6768R GP01G 50 21 4474 PIGEON GEAR CRL4428 024 6768R AP01B 50 139 4292 PIGEON ARM CWL44 025 6768R JP01H 50 093 3440 PIGEON PULLEY FLYW 026 6768R SP01D 01 080 4609 PIGEON SPRING CWL4 027 6768R MP01B 50 093 3036 PIGEON MOLD CWL44 ...

Page 33: ...GEAR CRL4428 024 6768R AP01B 50 139 4292 PIGEON ARM CWL44 025 6768R JP01H 50 093 3440 PIGEON PULLEY FLYW 026 6768R SP01D 01 080 4609 PIGEON SPRING CWL4 027 6768R DP01A 50 259 3342 PIGEON LEVER CWL44 028 6768R RP01A 22 027 41054 PIGEON ROLLER CWL 029 6768R MP01A 50 219 4033 PIGEON MOLD CWL44 031 6768R SP01L 01 080 4649 PIGEON SPRING CWL4 032 6768R EP01A 50 093 4070 PIGEON HEAD ASSY C 034 6768R SP01...

Page 34: ...55 322 322A CLAMP LEXAN 141 BK 156 318 318A DISC LUCKEY ABS XR 401 BK 157 423 423AAAA LOADING SUS420J2 158 384 384A SHAFT DURACON M90 44 BK 161 435 436AAAA MIDDLE NYCON 12 BK 162 435 437AAAA LOADING DURACON M90 44 BK 163 345S345A E 02 164 435 435AAAA PULLEY DURACON M90 44 BK 165 252 252A ASS Y 166 451 145U COUNTER CR RUBBER 170 225 225AAAA LOADING ASS Y 171 374 374A UP DURACON M90 44 BK 172 374 37...

Page 35: ...ONT FE 185E 853 6400RMBZ01B SPEAKER TWEETER B13TP6B2 BALHAE 25VE HZ LOCAL 854 6400RMTG01A SPEAKER WOOFER FE DV55VE TOPTONE F50C D138A 6 855 4766RM0007A FELT FE 185E DV25VE 380 BLACK WOOFE 856 3091RMW015A CABINET ASSY ASSY FE DV25VE 857 6871RU4122A PWB PCB ASSY SUBSET AUDIO FE DV25VE 2 7UF POSITIVE 2M SP 858 353M052P SCREW BH 3 5X24 859 353M050C SCREW BH 3 5X16 FBK 860 353M050F SCREW DRAWING 2 D3 5...

Page 36: ... 4 2 MEMO ...

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