Marantz 74 CD38/o1B - Focus Path Troubleshooting; Turntable and Actuator Checks; Communication and Focus Output; Power Supply and Clock Checks

15
15
1)-Turntable
and disc
free?
Audible
and
visible
control.
2)-Actuator
movement?
Visual
control.
3)-Signals
on
actuator
o.k.?
Triangle
wave
without
disc.
See
fig
1
.
2
Volt
-2
Volt
4)-Connections
to
actuator
o.k.?
Check
flex
connector
pin
2
and
3.
5)-Communication
uP
<->
IC7000.
SIDA
activity (pin
27
of IC7000).
6)-Focus
output
o.k.?
See
fig
2.
Measure
with an
10k/3n3
low-pass
filter.
7)-Components
o.k.?
Check
components
R3010,R3011
C2012,C2013
X-tal 1000
8)-Power
supply
for
opamp o.k.?
Check
components
R3006,R3007
C2008,C2009,C2071
,C2074
9)-Check
components
o.k.?
Check
components
R3074,R3075,R3076,R3077
R3078.R3079
C2075,C2076
10)
&
1
1)-Pin 17 of IC7000:
a
frequency
of
8.46MHz?
PCS
60
618