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MCM239
Service AIDS & CD playability ...........................1-1...1-4
Specifications ................................................................2
Connection & Controls ...................................................3
Disassembly Instructions ...............................................4
Block & Wiring diagrams ................................................5
C-MUSIC & USB BOARD ..............................................6
KEY & USB JACK BOARD ............................................7
POWER & AMP JACK BOARD ......................................8
EXPLODE DIAGRAM .....................................................9
SERVICE PARTLIST ....................................................10
FACTORY PARTLIST ...................................................11
3141 785 32011
1-1
SERVICE AIDS
Service Tools: Compact Disc:
Universal Torx driver holder .................................4822 395 91019 SBC426/426A Test disc 5 + 5A ...........................4822 397 30096
Torx bit T10 150mm ...........................................4822 395 50456 SBC442 Audio Burn-in test disc 1kHz .................4822 397 30155
Torx driver set T6-T20 .........................................4822 395 50145 SBC429 Audio Signals disc .................................4822 397 30184
Torx driver T10 extended .....................................4822 395 50423 Dolby Pro-logic Test Disc ....................................4822 395 10216
GB WARNING ESD
All 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.
GB
Safety regulations require that the set be restored to its original CLASS 1
condition and that parts which are identical with those specified,
be used LASER PRODUCT
Safety components are marked by the symbol ! .
Lead free
1-2
CD PLAYABILITY CHECK
Customer complaint
"CD related problem"
Set remains closed!
1
check playability
playability N
ok ?
Y 3
For flap loaders (= access to CD drive possible)
"fast" lens cleaning cleaning method 4 is recommended
check playability
Standard repair procedure
playability N
ok ?
4
clean the lens
Y
check playability
Play a CD
for at least 10 minutes
check playability
playability Y
ok ?
N
playability N
ok ? return set
5
check "EYE-Pattern"
Y
add Info for customer
"SET OK" 2 EYE-Pattern N
ok ?
Y
replace CD Drive
return set
6
check Laser current
return set
Laser current N
ok ?
1 - 7 For description - see following pages
Y
replace CD Drive
7
check CD Drive offsets
return set
Y CD Drive offsets N
ok ?
replace Signal Processor replace CD Drive
return set return set
1-3
CD PLAYABILITY CHECK
1 4
PLAYABILITY CHECK LIQUID LENS CLEANING
Before touching the lens it is advised to clean the
surface of the lens by blowing clean air over it.
For sets which are compatible with CD-RW discs
This to avoid that little particles make scratches on
use CD-RW Printed Audio Disc ....................7104 099 96611
the lens.
TR 3 (Fingerprint)
TR 8 (600