( 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
18
Summary of Contents for 1794
Page 1: ...Instruction Manual Model 1794 High Current Power Supply B PRECISION K ...
Page 36: ...TOP VIEW 33 ...
Page 37: ...BOTTOM VIEW OF MODEL 1790 1791 34 ...
Page 38: ...FRONT PANEL CONTROL PCB OF 1790 1791 35 ...
Page 39: ...POWER MODULE PCB OF 1790 1791 36 ...