ps23023

[lionelkjh]

Hello everyone! I am in the process of rehabilitating a laboratory supply that is now functional. By surrounding it; I realized the presence of a potentiometer found RP9 next to the integrated circuit LM741 (position: N2). The other potentiometers adjust the current and the maximum output voltage, and for this potentiometer I think of an offset setting. How should you go about fixing it? Thanks for your help

[Relayer]

Hello lionelkjh,

How should you go about fixing it?

I'm fairly certain that RP9 is to adjust the offset null. Therefore it
should zero out your voltmeter when you have the voltage control set to zero.
I hope it helps.
Regards,
Relayer

[lionelkjh]

Hello; I tried: but it does not change anything in output; yet voltage potentiometer set at least in continuous mv position. An idea??

[AlcidePiR2]

Hi,

Maybe
You can read this thread
https://www.eevblog.com/forum/repair/tuning-a-ps23023-power-supply/

[lionelkjh]

163/5000
I try by all means, and the multimeter always gives me a tension, and the setting does not change anything ..... Can someone help me with a scheme ??

[HB9EVI]

As far as I see this opa is part of the current regulator, not of the voltage regulator; so you're adjusting the current offset, not the voltage offset of the PSU