- 1-3 -
NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components
are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components
can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must be
taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnet-
ism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit
2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive 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 escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Resistor
(1 Mohm)
Conductive
Sheet
Resistor
(1 Mohm)
Armband
Summary of Contents for lh-t6340d
Page 6: ... 1 5 SPECIFICATIONS 83 dB W 1m 88 x 100 x 95 mm 0 54 kg 160 x 350 x 325 mm 4 12 kg 2 1 ...
Page 7: ... 1 6 ...
Page 8: ... 2 1 SECTION 2 AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1 POWER SUPPLY CIRCUIT ...
Page 9: ... 2 2 2 FRONT CIRCUIT 1 2 ...
Page 10: ... 2 3 3 FRONT CIRCUIT 2 2 ...
Page 11: ... 2 4 MEMO ...
Page 12: ... BLOCK DIAGRAM 2 5 2 6 ...
Page 13: ...2 7 2 8 SCHEMATIC DIAGRAMS POWER SCHEMATIC DIAGRAM ...
Page 14: ...2 9 2 10 MICOM SCHEMATIC DIAGRAM ...
Page 15: ...2 11 2 12 FRONT SCHEMATIC DIAGRAM ...
Page 16: ...2 13 2 14 DSP AMP SCHEMATIC DIAGRAM ...
Page 17: ...2 15 2 16 SMPS NARROW WIDE SCHEMATIC DIAGRAM ...
Page 18: ...2 17 2 18 WIRING DIAGRAM ...
Page 19: ...2 19 2 20 PRINTED CIRCUIT BOARD DIAGRAMS MAIN DVD P C BOARD DIAGRAM BOTTOM ...
Page 20: ...2 21 2 22 MAIN DVD P C BOARD DIAGRAM TOP ...
Page 21: ...2 23 2 24 FRONT P C BOARD TOP ...
Page 22: ...2 25 2 26 FRONT P C BOARD BOTTOM ...
Page 23: ...2 27 2 28 SMPS P C BOARD ...
Page 24: ... 3 1 SECTION 3 DVD PART TROUBLESHOOTING GUIDE 1 Test debug flow ...
Page 25: ... 3 2 ...
Page 26: ... 3 3 ...
Page 27: ... 3 4 ...
Page 28: ... 3 5 ...
Page 29: ... 3 6 ...
Page 30: ...3 7 3 8 DVD SCHEMATIC DIAGRAMS DVD MPEG DSP SCHEMATIC DIAGRAM ...
Page 31: ...3 9 3 10 DVD RF SERVO SCHEMATIC DIAGRAM ...
Page 34: ... 5 1 SECTION 5 SPEAKER SECTION MODEL LHS T6347T 850 851 A800 852 853 862 864 ...
Page 35: ... 5 2 MODEL LHS T6347W 953 954 955 956 964 952 951 950 ...
