Marantz 74 CD38 - Page 16

Replace by
old CDM
Check
decoder
17
Turntable motor
path
Discmotor
running?
Turntable
and disc free?
Connections
CDM o.k.?
N
Check
;
focus
Repair
path
Y
HF
signal
N
Mechanical
present?
obstruction?
Y
Y
N
Replace
Check
Remove
Replace
Check
CDM
lightpath
obstruction?
CDM
decoder
Check HF
amplifier
Y
Job done Replace Repair
CDM
17
1)-Still in focus (focus 0.k.?).
Voltage at pin 9 of connector 1052 > 15mvV.
2)-HF-signal present.
VHFI (R3048) > 900mV pp. (testpoint 65).
3)-Check HF-amplifier.
* Sypply 5V?
* Testpoint 17=1.4...1.9V DC?
* VHFI DC =2.9...3.6V?
4)-V motor 0.k.?
V motor < 2V: replace CDM.
V motor > 2V: check decoder part.
PCS 60 69