Zenith DVP7771 Manual page 22

4. RF/Servo Circuit
A.
CHECK POINT(General)
Does signal goes
"High" to IC207 Pin 186 when
the power is on?
YES
Does signal pulse
input IC201 pin53, 54, when
the power is on?
YES
Does Ic207 Pin67 signal
goes from high to 20W when the
power is on?
YES
Is IC203
Pin79, 80, 84, 88
about 2.2V?
YES
END
NO
NO
NO
33.8688MHz clock input
to IC207 Pin59.
YES
Replace IC207
NO
Check power circuit.
Does
NO
3-22
Replace X201 or IC211
(33.8688MHz clock defect)