B&K Precision 1794 - Manual - Manual (Page 21)

( C ) NO OUTPUT VOLTAGE.
NO O/P VOLTAGE
Is IC LM324 OK ? Replace It.
Is Voltage Pot Short ? Replace It.
Is Voltage Selection Preset Open ? Replace It.
Are Zener Diodes Z1 & Z2, Preset
VR1 on Preg. PCB OK ? Replace It.
Are all the Auxillary Winding Ensure their proper
Reaching PCB ? Connectivity with PCB.
Is there proper contact of Load Ensure proper Connectivity
Terminal with Terminal Nuts of Load Terminals and
Inside Unit. Terminal Nut inside.
1. Check IC LM324 on Front Panel PCB L1791-FP-CNT-0603.
It might be Damaged.
2. Check the voltage Potentiometer. It might be Short.
3. Check Voltage Selection Preset R22 on Front Panel PCB. It might be Open.
4. Check Preset VR1 on Pre-regulator PCB (PS-PREG-1791-0503).
It might be Open.
5. Check whether Auxillary Transformer Windings are reaching PCB.
6. Check whether there is proper contact between Load Terminals and Terminal
Nuts inside the Unit.
N
Y
Y
N
Y
N
N
Y
Y
N
Y
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