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Normal
Abnormal
Video amplifying
board is abnorma
l
T402,VD415 or
C415,C416 are
broken
V411 is not well
welded or open
Higher
Lower
Inspect the circuit
from pin50
、
51\52
、
51 of N204
to video amplifying
Check the voltage
of V411 collector is
normal
InspectT401
、
R437
etc
.
Abnormal
NO
YES
Abnormal
Normal
Normal
Abnormal
Abnormal
Normal
Check the voltage
Heater Resistor
open
Check to see if be
voltage of V411 is
existed?
Check the circuit
from pin13 of N204
to V444
No raster
Whether G2 voltage is normal
Change wrong component
or check
Check to see if +9V
voltage is normal at
PIN 17 of N204
Check Z901
、
N204 and
Check +9V power supply
Abnormal
Normal
Test filament voltage
Test the base voltage of V444
Maintenance Service and Trouble shooting
Maintenance Service and Trouble shooting
2
of all pins of XZ603
Normal
peripheral circuit of N204
18