Marantz 74 CD38/o1B - Turntable Motor Path Troubleshooting; Disc Motor Running and Focus Check; HF Signal and Mechanical Obstructions; Lightpath and Decoder Checks

17
17
N
Replace
by
old
CDM
Check
decoder
Replace
CDM
Check
I
I
lightpath
Problem
solved?
1)-Stlll
in focus
(focus
o.k.?).
Voltage
at
pin 9
of
connector
1052
> 15mV.
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 o.k.?
V
motor
<
2V: replace
CDM.
V
motor
> 2V:
check
decoder
part.
PCS
60
6«a