Marantz 74 CD38 - Page 10

1)-Turntable and disc free?
Audible and visible control.
2)-Actuator movement?
Visual control.
3)-Signals on actuator 0.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.? 2.5 Volt
See fig 2.
Measure with an 10k/3n3 iow-pass filter.
2.7 Volt pp
7)-Components o.k.?
Check components R3010,R3011
C2012,C2013
X-tal 1000
8)-Power supply for opamp 0.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 60678 —