(
•
0
(
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(::~~:EA
TRACK
GLUE
SERVICE PACKAGE
VACUUM PISTON
SOLDERING
~2
IRON~
• 9 WELLER
t:~~=~=::I
SOLDER TIP PT-H7
uR
SOLDERING
IRON~
SOLDER WICK
4822 321 40042
e g A PAIR
OF
TWEEZERS
SOLDERING IRON
SOLDER
WICK~
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
To Next Page
Loading...
