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3. SERVICING HINTS
/A
ESD~
Alie ICs and many other semi-conductors are susceptible
to electrostatic discharges (ESD) .
Careless handling during repair can reduce life
drastically.
When repairing, make sure that you are connected with
the same potential as the mass of the set via a wrist
wrap with resistance.
Keep components and tools also at this potential.
The disc should always rest properly on the turntable.
To achieve this a disc hold-down has been mounted in
the cover.
When the cover has to be taken from the set for repair, a
separate hold down should be used.
Switch SK2 has to be activated.
The set can be used normally.
3-1
In the set chip components have been applied.
For disassembly and assembly of chip components see
the figure below.
For measurements and adjustments it is possible to
position the working mechanism outside the set.
To do this work the following service aids are available:
- Service flat cable (14-pole)
4822 322
40066
- Service connector (14-pole)
4822 267 50676
These two items should be used to assemble an
extension calbe between connector 11 and the flex cable
of the
CDM-2
unit.
Remark: The service cable should be assembled as
follows (see drawing MDA 00311).
The 14-pole connector should be soldered as indicated in
the drawing. Please remove the blue tape of the rear of
the service flat cable-end which has to be connected to
~onnector 11.
'Ill
CDM FLEX-CABLE
4822 267 50676
SOLDER JOINT
4822 322 40066
MDA.00311
T19-73O
GENERAL
DISMOUNTING
MOUNTING
CHIP
SOLDER~ONENT SOLDER
e = n ( : : ~ ~ : E A TRACK
GLUE
SERVICE PACKAGE
VACUUM PISTON
SOLDERING
~ 2
I R O N ~
• 9 WELLER
t:~~=~=::I
SOLDER TIP PT-H7
uR
SOLDERING
I R O N ~
SOLDER WICK
4822 321 40042
e
g
A
PAIR OF TWEEZERS
SOLDERING IRON
SOLDER W I C K ~ CLEANING
SOLDERING
IRON
SOLDERING
IRON
PRECAUTIONS
Firi. 1
A
B
C
e
g.
A PAIR OF TWEEZERS
c&
---------,
SOLDER
005-0.Bmm
SOLDERING TIME
<
3 sec/side
SOLDER
0 0.5 • 0.8
mm
PRESSURE
♦
EXAMPLES
A
B
27 012CU
r,~
q q~fi.
f.;R
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