Check SiBE12-908
171 Service Diagnosis
3.5 Power Supply Waveform Check
Check No.08 Check the voltage waveform between power supply terminals on the terminal board for
disturbance using oscillo-tester.
Check to see if the power supply waveform is a sine wave (Fig.1).
Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2)
3.6 Main Circuit Electrolytic Capacitor Check
Check No.11
Do not touch the live parts within 10 minutes after the breaker is turned off.
Even after that, when you touch the parts, check that there is no DC voltage with a tester.
Check the continuity with a tester. It is OK if the tester shows good continuity when pins are
replaced.
[Fig.1] [Fig.2]
(R3466)
Set the tester to the
resistance measuring
range.
If the pointer swings
and returns, the
electrolytic capacitor is
OK.
If the pointer does not
swing, or does not return,
the electrolytic capacitor is
out of order.
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