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( E ) DPM NOT READ ( 000 ).
DPM NOT READ ( V & I )
( 000 )
Is DPM IC 707 OK ?
N
Replace It.
N
Ensure proper Continuity.
N
Replace It.
Y
Does Hi and Low Wire
Reach DPM's ?
Y
IC TL431 OK ?
Y
Is minimum Resistance
of Pot High ?
Y
Replace Pot.
1.
Check whether Voltage Hi and Voltage Low Wire is reaching DPM.
2.
Check DPM IC 7107. It might be Damaged.
3.
Check minimum Output Voltage of Potemtiometer.
It should be less than 150mV.
4.
See that Power Supply is earthed properly.
5.
Check IC TL 431 ( Z1 and Z2 ) on Front Panel PCB.
It might be Damaged.
6.
If Current DPM does not read then, check whether Current Hi and Low Wire
is reaching Current DPM.
20