PS03: No -30 Happy Light LED

[eframp]

Hi y'all, first post here.

I just finished assembling my PS03. When I fire up the power supply, I get happy lights for +48 and +30, but not -30. Doesn't matter whether the wiring harness is connected or not, or whether the front panel LED is connected or not. Thoughts?

thanks,
eric

[tpryan]

What modules are installed? Is there a load on the -30v output?

[eframp]

What modules are installed? Is there a load on the -30v output?

No modules installed yet, so no load on the -30v rail whatsoever.

e

[tpryan]

Don't worry about it until you've attached a load. Let us know what you find.

[eframp]

One other detail I forgot to mention: my output voltages measured on the Molex jack are easily within 5% of correct.

Wonder if I just got a bad LED or something.

On with the C84 assembly...I'll let y'all know what happens.

e

[eframp]

OK, got the C84 assembled and installed. Everything works perfectly, so indeed I must've just gotten a bad LED or something.

e

[tpryan]

Are you saying the -30v LED is still dark? What voltage do you measure at the -30v output?

[eframp]

Yup - the -30v LED is still dark, but I measure almost exactly -30v at the correct pin on the Molex, and my C84 is happy as can be.

e

[tpryan]

Well, something's not right but it doesn't sound like it's doing any harm. We'll be happy to repair or exchange the PS03 if you like.

[eframp]

If it ends up being an issue, I can always send it back at that point. It was more of a curiosity thing than anything. Thanks for the support!

Eric

[glide 1]

Are you saying the -30v LED is still dark? What voltage do you measure at the -30v output?

Hi tim i have a similar problem. I cant seem to get the power led to work. When i power up the -30v led lights up momentarily then turns off after a second or so. When there are no modules connected however, all three led's light up but still no power led. I have the 2 N72's working perfect though.

glide 1

[tpryan]

You probably have the panel lamp wired backwards. If the -30v output is between -28v and -32v you don't have a problem.

[glide 1]

Hi tim, i'm sure i have it connected the right way, positive with a white mark on the lamp which goes to the outer most pad on the PSO3. I'm getting -31.8v and +28.6 but as soon as i plug a module in, the voltages go up slightly to -34.5v and +29.9v, still no lamp. Anything else i could check for?

[tpryan]

Try reversing the leads and see what happens. If it still doesn't work, let us know and we'll send a replacement. Are you quite sure you're getting 30V at the lamp terminals?

[glide 1]

Hi Tim, i tried reversing the leads but still no lamp. I'm getting 30v at the terminals also. Please check your mail.