Marantz 74 CD38 - Page 14

Turntable N
disc tree?
Y
N
Actuator
movement?
Check
lightpath
Check
connector
Communic. uP
0.k.?
Check uP
or Y
connections
Repair
Check
components
opamp
Repair OK
NOK
. Replace
opam
to80"
Check
components
1¢7000
OK
10
N Replace
Clock o.k.? X-tal
1000
Replace
1¢7000
Job
done
Replace
CDM
ES
ES
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.
4)-Connections to actuator 0.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
C20 12, 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) & 11)-Pin 17 of IC7000: a frequency of 8.46MHz?
-2Volt -}--v---V---V---V--.
2.5 Volt
2.7 Volt pp
PCS 60 6g