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Maintenance Service and Trouble shooting
5
Make C703 open. Multimeter is at band R
Χ
1K. Red probe
connect to ground. Touch No.7 of N701 with black probe
Picture exists but no sound
Make V701 collector open. Touch
No.7of V701 with black probe to
see if noise exists
Power amplifier is abnormal.
Inspect N701 and peripheral
components of N701
Inspect V701
、
V103
Check to see if
+20V exists
Inspect N204 and peripheral
I20V
Yes
No
Yes
No
Have noise
No noise
power supply
component of N204
6.
Yes
No
Inspect
Inspect the circuit
from No.50of N204 to
Yes
No
Change V611 or
weld V611 again
Check to see if voltages of
XZ601 are normal
Lack of red
Check to see if V611 is
Inspect R616,R617,R236
open or not well welded
No.3 of XZ603
20