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LG LM-M1040A, Service Manual

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LG LM-M1040A Service Manual Download Page 11

- 2-4 -

Muting circuit Troubleshooting (if MUTE)

Does “Low” appear at Q602 “B”

Q701, Q751(IC302) Base “LOW” check

MUTE

Check pin2 of troubleshooting 

Check the connector of Q602 “B” & GND

Refer to “IC601 Troubleshooting”.

Refer to “IC401 Troubleshooting”.

Check pin5 IC501.

Refer to “IC602 Troubleshooting”.

Audio abnormal

Check the output of IC601 pin24, 25

Check pin 6, 10 of IC401

Check pin 1, 7 of IC602

Check pin13 of IC700

Check MUTE

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

Summary of Contents for LM-M1040A

Page 1: ...NI HI FI SYSTEM SERVICE MANUAL P N 3829RAT113R OCTOBER 2004 MODEL LM M1040A LMS M1040 SERVICE MANUAL MODEL LM M1040A LMS M1040 CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...BLOCK DIAGRAM of ICs 2 21 BLOCK DIAGRAM 2 33 SCHEMATIC DIAGRAMS 2 35 WIREING DIAGRAM 2 45 PRINTED CIRCUIT DIAGRAMS 2 47 SECTION 3 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 3 1 TAPE DECK MECHANISM A R A S LEFT A S DECK 3 3 TAPE DECK MECHANISM A R A S RIGHT A R DECK 3 5 CD MECHANISM 3 7 SECTION 4 SPEAKER PART SPEAKER PART 4 1 SECTION 5 REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST 5 1 ...

Page 3: ...ver 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 t...

Page 4: ...tive 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 1M Ω 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent sta tic electricity changes in the clothing to...

Page 5: ...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 6: ... 1 5 SPECIFICATIONS ...

Page 7: ... 1 6 MEMO ...

Page 8: ...nd 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 TAPE DECK ADJUSTMENT 1 AZIMUTH ADJUSTMENT Figure 1 Azimuth Adjustment Connection Diagram CH1 CH2 Speaker Out Playback Mode Head Test Tape MTT 114 L ch R ch...

Page 9: ...eform of D913 Check R943 and replace ZD901 Replacement D913 VKK PART Does DC 33V appear at PN514 pin3 Check the voltage of IC301 pin51 Replace Q903 Refer to power circuit Dose 33V appear at ZD902 Check Q903 TURN ON Check the pattern Replace D912 D911 END ZD902 replacement Check the 33V Lower of C916 NO NO NO NO NO NO YES YES YES YES YES YES ...

Page 10: ...C944 Check the DC output of C755 C956 C957 12V 6 2V 32V Check the output of C949 5V OK Check the D940 D941 Replace the D940 D941 Check the DC output of IC941 C958 Replace the D947 D956 D955 Replace the F940 Replacement the IC901 NO NO NO NO NO YES YES YES YES YES ...

Page 11: ...bleshooting Check the connector of Q602 B GND Refer to IC601 Troubleshooting Refer to IC401 Troubleshooting Check pin5 IC501 Refer to IC602 Troubleshooting Audio abnormal Check the output of IC601 pin24 25 Check pin 6 10 of IC401 Check pin 1 7 of IC602 Check pin13 of IC700 Check MUTE NO NO NO NO NO NO YES YES YES YES YES YES ...

Page 12: ... Check the signal input of JK600 FUNCTION MODE AUDIO ABNORMAL TAPE Check the signal input of IC601 pin28 37 Refer IC14 Troubleshooting NO NO NO NO NO YES YES YES YES YES YES YES YES YES CD Check the signal input of IC601 pin31 34 CheckthesignalofCN513pin1 3orRefertoCDTroubleshooting TUNER Check the signal input of IC601 pin30 35 Refer to TUNERMODULE MIC Check pin4 of PN401 Refer to IC404 Troublesh...

Page 13: ...uit Troubleshooting Check the P SENS Replace X301 Check the RESET circuit IC501 Troubleshooting Check the power supplied to IC501 pin16 Check the CLK Data of IC501 pin2 3 Check the CONTROL function END Refer to IC301Troubleshooting Refer to power circuit Troubleshooting IC501 replace Check the pattern of IC301 IC501 Check the Data of IC301 pin3 4 CD TAPE FUNCTION YES YES YES YES YES YES YES NO NO ...

Page 14: ...fer to power circuit troubleshooting Check the IC301 pin76 75 5 10 Replacement IC601 Check the PATTERN of MICOM 82 83 IC 21 22 Replace the IC601 Refer the IC301 Troubleshooting IC700 Troubleshooting Check the signal input of 11 15 Check the power of pin1 5 pin6 17 Check the signal Output of pin 5 7 END Refer to Muting Troubleshooting Refer to SMPS Troubleshooting Check pin13 appear 0 5V YES YES YE...

Page 15: ... the Muting circuit Refer to power circuit Troubleshooting Check the Deck Mechanism Replace the Deck Mechanism Replacement IC202 Dubbing check NORMAL or REC HIGH Q252 202 OFF ON R273 223 Low HIGH Q253 203 ON OFF Refer to RECTroubleshooting Refer IC203 Troubleshooting YES YES YES YES YES NO NO NO NO ...

Page 16: ...Low of Q253 Q203 B Replacement Q253 Q203 Refer to IC203 Troubleshooting Check the Vcc power of IC202 pin18 Check the power or Refer to IC203 Troubleshooting Check power supplying to C236 Refer to power circuit Troubleshooting Refer to IC203 Troubleshooting Replace the Q208 Replace the L203 Check the 0 6V of Q208 B Check the Low of Q208 C Replace Q207 END NO NO NO NO NO NO NO NO NO YES YES YES YES ...

Page 17: ...CK MICOM INTERFACE CIRCUIT PN807 CONNECTOR CHECK PN801 PN802 CHECK PICKUP MOVEMENT CHECK BA5810FP IC803 CHECK MN6627933CG IC801 CHECK AN22004 IC802 CONNECTOR CHECK PN808 CONNECTOR CHECK PN808 PN807 PN802 PN801 OPEN CLOSE CHECK READING DISPLAY CHECK READING OK CHECK IF PLAY AUDIO OUTPUT CHECK OK YES YES YES YES YES NO NO NO NO ...

Page 18: ...FECTIVE MICOM DEFECTIVE IC803 DEFECTIVE MECHANISM CHECK POWER SUPPLY CIRCUIT PN808 PN807 PN808 PIN 5 6 2V PIN 7 5V PN807 PIN 1 5V CHECK VOLTAGE CHANGE OF OPEN CLOSE AND BTLMUTE VOLTAGE 5V PN807 PIN 20 OPEN 19 CLOSE 4 BTLMUTE CHECK VOLTAGE CHANGE LO LO OF IC803 PN807 PIN OPEN 20 CLOSE 19 YES YES YES ...

Page 19: ...TOR CHECK RESET SIGNAL OF PN807 PN807 PIN12 5V CHECK VOLTAGE THE PIN 2 OF IC805 IC805 PIN2 3 3V DEFECTIVE MICOM OR CONNECTOR DEFECTIVE IC801 CHECK MICOM INTERFACE CIRCUIT PN807 PN807 PIN 11 13 14 15 SIGNAL CHECK 11 STAT 13 MDATA 14 MCLK 15 MLD CHECK THE WAVE FORM 1 CHECK POWER SUPPLY PORT PN808 PN807 PN808 PIN 5 6 2V PIN 7 5V PN807 PIN 1 5V YES YES NO NO NO NO NO YES YES YES ...

Page 20: ...TATE IS READING OK CHECK PN801 PIN 14 15 TA TA CHECK PN802 PIN 5 6 SP SP CHECK PN802 PIN 10 LD CHECK PN801 PIN 13 16 FA FA CHECK PN802 PIN 3 4 SL SL DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 DEFECTIVE PICKUP OR IC803 OR IC801 DEFECTIVE PICKUP OR IC802 DEFECTIVE PICKUP OR IC803 DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 NO NO NO NO NO YES YES YES YES YES ...

Page 21: ...AR AT IC803 PIN14 AND PN802 PIN3 WAVEFORM 2 SLED MOTOR WAVE DOES SLIN WAVEFORM APPEAR AT IC803 PIN 5 WAVEFORM 2 SLED DRIVE WAVE DEFECTIVE IC801 CHECK PN802 CONNECTOR LINE DEFECTIVE IC803 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SLED MOTOR NO NO NO NO NO YES YES ...

Page 22: ... FA WAVEFORM APPEAR AT IC803 PIN15 AND PN801 PIN16 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOES FAIN WAVEFORM APPEAR AT IC803 PIN 26 WAVEFORM 3 FOCUS DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC803 DEFECTIVE PN801 CONNECTOR CHECK PN801 CONNECTOR LINE DEFECTIVE PICKUP FOCUS ACTUATOR ...

Page 23: ... VOLTAGE CHECK IS 3 3 V APPLIED TO PIN3 OF IC802 RF IC SUPPLY VOLTAGE CHECK IS 2 0 V PIN2 OF IC802 LASER CONTROL VOLTAGE CHECK DEFECTIVE IC805 DEFECTIVE IC802 CHECK PN801 CONNECTOR LINE DEFECTIVE Q801 OR D811 DEFECTIVE PN801 CONNECTOR DEFECTIVE PICKUP LASER PART NO NO NO NO NO NO YES ...

Page 24: ...WAVEFORM APPEAR AT IC803 PIN12 AND PN802 PIN6 WAVE FORM 4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT IC803 PIN 6 WAVEFORM 4 SPINDLE DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC803 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SPINDLE MOTOR CHECK PN802 CONNECTOR LINE ...

Page 25: ...FORM APPEAR AT IC803 PIN 23 WAVEFORM 5 TRACKING DRIVE WAVE DEFECTIVE IC801 DEFECTIVE IC803 DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP OR IC802 DEFECTIVE PICKUP OR IC802 DEFECTIVE IC801 CHECK PN802 CONNECTOR LINE DOES ARF SIGNAL APPEAR IC802 PORT 8 WAVEFORM 6 DOES FE TE SIGNAL APPEAR IC802 PORT FE 23 TE 21 WAVEFORM 6 NO NO NO NO NO NO NO YES YES YES ...

Page 26: ... 2 19 WAVEFORMS OF MAKOR CHECK POINT ...

Page 27: ...SPINDLE DRIVE AND MOTOR WAVEFORM IC503 pin6 1 2 when TOC reading 5 TRACK DRIVE AND MOTOR WAVEFORM TP560 IC503 pin23 during normal play 6 RF TRACKING AND FOCUS ERROR WAVEFORM IC502 pin8 2 1 23 during normal play ...

Page 28: ... 2 21 INTERNAL BLOCK DIAGRAM of ICs KIA6289N IC14 BLOCK DIAGRAM ...

Page 29: ... 2 22 ...

Page 30: ... 2 23 BA3126N IC201 2 channel head switch for radio cassette recorders ...

Page 31: ...rallel OUT driver NJM2155 IC401 BLOCK DIAGRAM PIN CONFIGRATION Control circuit 12 bit shift register Latch Output buffer open drain 1 Vss 2 DATA 3 CLOCK 4 Q0 5 Q1 6 Q2 7 Q3 8 Q4 16 VDD 15 Q11 14 Q10 13 Q9 12 Q8 11 Q7 10 Q6 9 Q5 Block diagram ...

Page 32: ...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 output 15 16 18 Q11 parallel data output 17 19 OE Output Enable 16 18 20 VDD Power sup...

Page 33: ... 2 26 Block diagram ...

Page 34: ... 2 27 KIA4558P S IC602 BIPOLAR LINEAR INTEGRATED CIRCUIT ...

Page 35: ... 2 28 STK 403 120 IC700 ...

Page 36: ... 2 29 BA5810FP IC803 ...

Page 37: ... 2 30 KA3082 IC807 Bi Directional DC Motor Driver Description The KA3082 is a monolithic integrated circuit designed for driving bi directional DC motor with braking and speed control ...

Page 38: ... 2 31 KIA7805AP API IC940 THREE TERMINAL POSITIVE VOLTAGE REGULATORS 5V 6V 8V 9V 10V 12 15V 18V 24V EQUIVALENT CIRCUIT ...

Page 39: ... 2 32 ...

Page 40: ... BLOCK DIAGRAM IC404 A JK401 SMPS Power code 12V 40V 40V P SENS TUNER FUNTION OP AMP 6 2V CD MICOM EXPENDER 501 IC3 BU2090 LC72131M JK600 601 IC602 STK403 120 IC700 IC404 B 2 33 2 34 ...

Page 41: ...2 35 2 36 SCHEMATIC DIAGRAMS MAIN SCHEMATIC DIAGRAM ...

Page 42: ...2 37 2 38 DECK SCHEMATIC DIAGRAM ...

Page 43: ...2 39 2 40 FRONT SCHEMATIC DIAGRAM ...

Page 44: ...2 41 2 42 SMPS WIDE SCHEMATIC DIAGRAM ...

Page 45: ...2 43 2 44 CDP SCHEMATIC DIAGRAM ...

Page 46: ...2 45 2 46 WIRING DIAGRAM ...

Page 47: ...2 47 2 48 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD SOLDER SIDE ...

Page 48: ...2 49 2 50 MAIN P C BOARD COMPONENT SIDE ...

Page 49: ...2 51 2 52 FRONT P C BOARD SOLDER SIDE ...

Page 50: ...2 53 2 54 FRONT P C BOARD COMPONENT SIDE ...

Page 51: ...2 55 2 56 SMPS P C BOARD ...

Page 52: ...2 57 2 58 CD MAIN P C BOARD COMPONENT SIDE CD MAIN P C BOARD SOLDER SIDE ...

Page 53: ...272 455 302 305 304 354 454 454 454 A46 MIC Option MIC Option 306 A00 A43 303 355 A41 A26 270 269 351 454 354 266 267 268 265 264 263 262 284 285 261 287 258 257 287 255 256 250 251 252 253 254 286 284 259 260 MIC Option CABINET AND MAIN FRAME SECTION ...

Page 54: ...3 3 3 4 TAPE DECK MECHANISM A R A S LEFT A S DECK 016 401 018 007 008 015 023 019 021 020 505 017 403 504 025 026 030 029 028 401 027 502 009 401 003 501 401 011 013 009 022 ...

Page 55: ...ANISM A R A S RIGHT A R DECK 025 504 023 015 022 019 037 021 020 505 018 017 016 506 006 A01 402 008 007 401 001 002 003 502 507 501 502 402 401 009 401 009 011 013 035 039 031 040 028 029 027 026 038 028 032 406 409 403 036 ...

Page 56: ...3 7 3 8 416 151 156 418 169 173 171 170 419 163 422 165 159 164 417 417 416 166 167 177 175 172 162 153 168 155 CD MECHANISM ...

Page 57: ...3 9 3 10 MEMO MEMO ...

Page 58: ... 4 1 SECTION 4 SPEAKER SECTION MODEL LMS M1040 861 862 857 856 860 859 853 854 855 850 850 852 LEFT RIGHT ...

Page 59: ... 4 2 MEMO ...

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