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5.
REPAIR HINTS
To prevent loose metal objects from getting into the CD
mechanism, make sure that the repair area is clean.
Before commissioning or servicing the device, the
two transport screws in the bottom can be removed.
These must be refitted after servicing.
The lens can be cleaned with a blower brush.
The CD mechanism is fitted with self-lubricating bearings and
must therefore NOT be lubricated.
Make sure that during repairs and measurements on the
side, the unit is not resting on the turntable motor shaft.
Do not loosen any screws other than those mentioned in the
hints.
The device consists of several MOS ICs. Because MOS ICs are
generally very sensitive to overload and overvoltage, the greatest
possible care must be taken during servicing. For further
instructions, see the package insert in the packaging of the ICs.
The CD must always rest properly on the turntable. For this
purpose, a plate pressure device is mounted in the lid. If a plate
has to be used for repairs to a boxed-out frame, use a separate
pusher. Code number of the pusher is 4822 532 60906.
Chip components are used in the device. For disassembling and
assembling chip components, see figures below.
The servo-µp can be placed in the service position to check the
switch and display board and also to test the servo systems
separately. (See Troubleshooting Method.)
The ERCO-IC, (Error Correction IC) which is supplied by
servicing, operates on a supply voltage of approx. 5V.
When an ERCO-IC is replaced, check the supply voltage.
If an extra PCB is mounted on the decoding PCB, remove
this PCB and make the connections as indicated in the
drawing of the decoding PCB.
The ICs used in the decoding circuit may have a different type
number than stated in the principal diagram.
DEMOD = SAA7010 = M429x
ERCO
= SAA7020 = M428x
CIM
= SAA7000 = M430x
FIL
= SAA7030 = M455x
x is a digit from 0 - 9.
Service supports are provided for bottom settings that require the
unit to be in the normal operating position. Code number 4822
395 30202.
These supports can be fixed in the 4 holes of the frame.
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