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TROUBLE SHOOTING
A. No Raster
Check 85V Line
(Measure the voltages by Kland K2)
25V Line
on the DEF PWB PWE-173A
NG
Check Switching Regulator
OK
unit (See item 0)
Check HV.
( Judge peculiar noise of HV generated at)
operation
power SW ON, or static electricity.
CD
Check Switching Regulator
NG
unit (See item 0)
OK
®
Check H.OSC/DEF/HV
circuit (See item E)
Check 12V Line
( Measure, the voltage by HCl )
on the CRT PWB PWE-l77A
NG
IC503.R579 Failure
OK
Check ifthe CRT
Heater lit?
NG
Check 6V Line
(Measure the voltage by HC2.)
on the CRT PWB PWE-l77A
OK
NG
IC504.R573 Failure
OK
HC connector disconnected
Check Screen
(Measure the voltage by Y
)
Normally, Screen Voltage is about
Voltage
on the CRT PWB PWE-l77A
through 300V to 900V
NG
T504, R940, C914 Failure
OK
Check the Clamp
(Measure the pulse by N4 on
)
Pulse
the INTERFACE PWB PWE-176
NG
IC80S, TR859 and their
ambient circuit Failure
OK
( Continue)
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