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 or 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 SH33SD-S
Page 25: ...2 16 4 SLED CONTROL RELATED SIGNAL NO DISC CONDITION FIG 4 1 1 2 3 4 1 2 3 4 ...
Page 27: ...2 18 FIG 7 2 DVD 7 DISC TYPE JUDGEMENT WAVEFORMS FIG 7 1 DVD 1 2 3 IC501 IC501 1 2 3 1 2 3 ...
Page 28: ...2 19 FIG 7 4 CD FIG 7 3 CD 1 2 3 IC501 IC501 1 2 3 1 2 3 ...
Page 29: ...2 20 FIG 8 2 CD 8 FOCUS ON WAVEFORMS FIG 8 1 DVD 1 2 3 1 2 3 4 4 1 2 4 3 IC501 ...
Page 41: ...2 32 2 IC401 MOTOR DRIVER PIN CONFIGURATION BLOCK DIAGRAM ...
Page 42: ...2 33 1 IC501 MPEG MT1389L PIN DESCRIPTION ...
Page 66: ...2 69 2 70 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW ...
Page 67: ...2 71 2 72 MAIN P C BOARD DIAGRAM BOTTOM VIEW ...
Page 74: ...2 PASSIVE SUBWOOFER SH33SD W 950 A90 951 953 956 954 952 955 WIRE90 3 7 ...
Page 75: ......