Table of Contents
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2
Normal
Test filament voltage
Normal
Check the voltage
of all pins of SK501
Normal
Video amplifying
board is abnorma
l
Check to see if +8V
voltage is normal at
PIN 10 or 14 of IC201
No raster
Whether G2 voltage is normal
Abnormal
Heater Resistor
open
Abnormal
Inspect the circuit
from pin51 、52、
53 of IC201 to
video amplifying
T401, D402 or
C419,C420 are
broken
Normal
Check X201、IC201 and
peripheral circuit of IC201
Maintenance Service and Trouble shooting
Abnormal
Test the base voltage of Q402
Normal
Check to see if be
voltage of Q402 is
existed?
YES
NO
Check the voltage
of Q402 collector is
normal
Lower
Higher
Q402 is not well
welded or open
Abnormal
Change wrong component
or check
Abnormal
Normal
Check +8V ,+5V power
7
Abnormal
Check the circuit
from pin15 of IC201
to Q402
InspectT402、R427
.
etc
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