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Zenith LX-140, Руководство по обслуживанию, Страница: 25 / 47

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- 2-18 -

IC103 Troubleshooting

AM COIL Troubleshooting

Check the Power input of IC103 pin17

X104 oscillation

Refer to “Power

Troubleshooting”

Repleace the X104

Repleace the IC103

Refer to “IC103 Troubleshooting”
CE: Chip Enable
DI: Data Input (from u-com)
DO: Data Output (to u-com)
CLK: Tuner mode clock

Check the Clock of CE, DI, DO, CLK

Check the operation

END

YES

YES

YES

YES

NO

NO

NO

NO

Check the “High” of L102 Pin2

Check the oscillation the L102 pin 13

Check the IC102 Troubleshooting

Refer to “IC103

Troubleshooting”

Replace the L102

YES

NO

Содержание LX-140

Страница 1: ...MICRO COMPONENT...

Страница 2: ...UBLESHOOTING 2 2 WAVEFORMS OF MAJOR CHECK POINT 2 11 BLOCK DIAGRAM 2 21 SCHEMATIC DIAGRAMS 2 23 WIREING DIAGRAM 2 31 PRINTED CIRCUIT DIAGRAMS 2 32 INTERNAL BLOCK DIAGRAM OF ICs 2 39 SECTION 3 EXPLODED...

Страница 3: ...er 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...

Страница 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...

Страница 5: ...arges 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 p...

Страница 6: ...1 5 SPECIFICATIONS...

Страница 7: ...1 6 MEMO...

Страница 8: ...chassis ground unless otherwise specified 5 Keep the signal input as low as possible to avoid AGC and AC action TAPE DECK ADJUSTMENT CH1 CH2 Speaker Out Playback Mode Head Test Tape MTT 114 L ch R ch...

Страница 9: ...2 2 CD PART TROUBLESHOOTING...

Страница 10: ...2 3 OPEN CLOSE NG...

Страница 11: ...2 4 READING DISPLAY CHECK ONLY CD DISPLAY...

Страница 12: ...2 5 READING OK CHECK NO DISC DISPLAY...

Страница 13: ...2 6 READING OK CHECK A NO DISC DISPLAY...

Страница 14: ...2 7 READING OK CHECK B NO DISC DISPLAY...

Страница 15: ...2 8 READING OK CHECK C NO DISC DISPLAY...

Страница 16: ...2 9 READING OK CHECK D NO DISC DISPLAY...

Страница 17: ...2 10 READING OK CHECK E NO DISC DISPLAY...

Страница 18: ...2 11 WAVEFORMS OF MAKOR CHECK POINT...

Страница 19: ...PINDLE 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 no...

Страница 20: ...2 13 AUDIO PART...

Страница 21: ...2 14...

Страница 22: ...2 15...

Страница 23: ...2 16...

Страница 24: ...e the TU101 Check the OSC waveform of TU101 pin8 Refer to IC102 Troubleshooting YES YES YES YES YES NO NO NO IC102 Troubleshooting Check the power input of IC102 pin8 Check the wavefor of IC102 Pin20...

Страница 25: ...the IC103 Refer to IC103 Troubleshooting CE Chip Enable DI Data Input from u com DO Data Output to u com CLK Tuner mode clock Check the Clock of CE DI DO CLK Check the operation END YES YES YES YES N...

Страница 26: ...the SW201 and HEAD connector Check the output to speaker Check the CN202 Check the CN201 YES YES YES YES NO NO NO REC Check the signal input of IC201 pin4 11 Check the of CN201 pin4 5 Check the oscil...

Страница 27: ...2 20 MEMO...

Страница 28: ...BLOCK DIAGRAM 2 21 2 22...

Страница 29: ...2 23 2 24 SCHEMATIC DIAGRAMS FRONT POWER SCHEMATIC DIAGRAM...

Страница 30: ...2 25 2 26 MAIN DECK SCHEMATIC DIAGRAM...

Страница 31: ...2 27 2 28 TUNER SCHEMATIC DIAGRAM...

Страница 32: ...2 29 2 30 CDP SCHEMATIC DIAGRAM...

Страница 33: ...2 31 2 32 WIRING DIAGRAM...

Страница 34: ...2 33 2 34 PRINTED CIRCUIT DIAGRAMS FRONT P C BOARD...

Страница 35: ...2 35 2 36 MAIN P C BOARD...

Страница 36: ...2 37 2 38 CDP P C BOARD...

Страница 37: ...2 39 INTERNAL BLOCK DIAGRAM OF ICs IC300 LC87F73C8A 1 Pin Assignment...

Страница 38: ...2 40 IC601 TDA7468D 1 BLOCK DIAGRAM...

Страница 39: ...2 41 2 PIN CONNECTION...

Страница 40: ...2 42 IC301 BU1923 1 BLOCK DIAGRAM...

Страница 41: ...2 43 IC102LA1837 1 BLOCK DIAGRAM IC102LA1837 2 Test Circuit Diagram...

Страница 42: ...2 44 IC103 LC72131D 1 Pin Assignments...

Страница 43: ...2 45 IC201 AN7312 1 BLOCK DIAGRAM IC701 LA4631 1 BLOCK DIAGRAM...

Страница 44: ...addresses are multiplexed on the same pins Row address RA0 RA10 column address CA0 CA7 BA Bank Select Address Selects bank to be activated during row address latch time Selects bank for read write dur...

Страница 45: ...3 305 280 451 451 451 A46 295 294 293 291 292 290 A00 251 254 253 250 255 256 257 258 A40 266 266 270 252 268 267 269 NOTE Refer to SECTION 5 REPLACEMENT PARTS LIST in order to look for the part numbe...

Страница 46: ...4 1 SECTION 4 SPEAKER SECTION MODEL LXS M140 855 854 853 852 851 861 850 850...

Страница 47: ...4 2 MEMO...

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