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P r o b l e m
power supply w i l l
not go on.
No output voltage. Voltmeter does not move.
No output current. Ammeter does not move.
Excessively large
output.
Unstable output.
16
8.
TROUBLESHOOTING
Indicators or Areas to check
Power ON lamp does not light
up.
Output voltmeter and ammeter
readings do not decrease.
Input voltage i s wrong.
Machine i s vibrating.
Strong magnetic or
e l e c t r i c a l f i e l d nearby.
C a u s e
*poor connection of
power cord, or broken
wire
*Bad power switch
*Fuse meltdown
* Circuit malfunction
* Circuit malfunction
*Bad power trasistor or
control mechanism
* C i r c u i t malfunction
* Operating outside the
rated voltage range
* 0 s c i 1 l a t i o n s due to
s p e c i a l
l o a d
*Remove from source
of oscillations.
type
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