Marantz 74 CD38/o1B - Fault Finding - Actuator and Components; Actuator Movement and Signals; Component Checks

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
2.7
Volt
pp
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)
&
11)-Pin 17
of IC7000:
a
frequency of
8.46MHz?
PCS
60
678