B&K 1794 instruction manual No Output Voltage, No O/P Voltage

( C ) NO OUTPUT VOLTAGE.

NO O/P VOLTAGE
Is IC LM324 OK ?	N
Y
Is Voltage Pot Short ?	Y
N
Is Voltage Selection Preset Open ?	Y
N
Are Zener Diodes Z1 & Z2, Preset	N
VR1 on Preg. PCB OK ?
Y
Are all the Auxillary Winding	N
Reaching PCB ?
Y
Is there proper contact of Load	Y
Terminal with Terminal Nuts
Inside Unit.

Replace It.

Replace It.

Replace It.

Replace It.

Ensure their proper Connectivity with PCB.

Ensure proper Connectivity of Load Terminals and

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.

18