- 2-17 -
FM(TU101) Troubleshooting
Check the 12V input of TU101 pin6
Check the “High” of TU101 Pin5
Check the 12V of Q102 “E”
Check the Power circuit
Refer to “IC103
Troubleshooting”
Check the “LOW” of IC103 pin7
Replace the Q102
Replace 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, 21
Refer to “Power
Troubleshooting”
Check the FM(TU101), AM(L102)
Replace the IC102
Check the “LOW” of IC102 Pin 13
Replace the IC103
Refer to “IC103
Troubleshooting”
Check the waveform output IC102 pin 16, 17
END
YES
YES
YES
NO
NO
NO
Summary of Contents for LX-140
Page 1: ...MICRO COMPONENT...
Page 6: ...1 5 SPECIFICATIONS...
Page 7: ...1 6 MEMO...
Page 9: ...2 2 CD PART TROUBLESHOOTING...
Page 10: ...2 3 OPEN CLOSE NG...
Page 11: ...2 4 READING DISPLAY CHECK ONLY CD DISPLAY...
Page 12: ...2 5 READING OK CHECK NO DISC DISPLAY...
Page 13: ...2 6 READING OK CHECK A NO DISC DISPLAY...
Page 14: ...2 7 READING OK CHECK B NO DISC DISPLAY...
Page 15: ...2 8 READING OK CHECK C NO DISC DISPLAY...
Page 16: ...2 9 READING OK CHECK D NO DISC DISPLAY...
Page 17: ...2 10 READING OK CHECK E NO DISC DISPLAY...
Page 18: ...2 11 WAVEFORMS OF MAKOR CHECK POINT...
Page 20: ...2 13 AUDIO PART...
Page 21: ...2 14...
Page 22: ...2 15...
Page 23: ...2 16...
Page 27: ...2 20 MEMO...
Page 28: ...BLOCK DIAGRAM 2 21 2 22...
Page 29: ...2 23 2 24 SCHEMATIC DIAGRAMS FRONT POWER SCHEMATIC DIAGRAM...
Page 30: ...2 25 2 26 MAIN DECK SCHEMATIC DIAGRAM...
Page 31: ...2 27 2 28 TUNER SCHEMATIC DIAGRAM...
Page 32: ...2 29 2 30 CDP SCHEMATIC DIAGRAM...
Page 33: ...2 31 2 32 WIRING DIAGRAM...
Page 34: ...2 33 2 34 PRINTED CIRCUIT DIAGRAMS FRONT P C BOARD...
Page 35: ...2 35 2 36 MAIN P C BOARD...
Page 36: ...2 37 2 38 CDP P C BOARD...
Page 37: ...2 39 INTERNAL BLOCK DIAGRAM OF ICs IC300 LC87F73C8A 1 Pin Assignment...
Page 38: ...2 40 IC601 TDA7468D 1 BLOCK DIAGRAM...
Page 39: ...2 41 2 PIN CONNECTION...
Page 40: ...2 42 IC301 BU1923 1 BLOCK DIAGRAM...
Page 41: ...2 43 IC102LA1837 1 BLOCK DIAGRAM IC102LA1837 2 Test Circuit Diagram...
Page 42: ...2 44 IC103 LC72131D 1 Pin Assignments...
Page 43: ...2 45 IC201 AN7312 1 BLOCK DIAGRAM IC701 LA4631 1 BLOCK DIAGRAM...
Page 46: ...4 1 SECTION 4 SPEAKER SECTION MODEL LXS M140 855 854 853 852 851 861 850 850...
Page 47: ...4 2 MEMO...
