Power supply identification needed

[Transwarp]

It was a bit dirty inside, I have managed to clean it out with Henry followed by some brake claener.

Looks like somebody emptied a Henry out on it beforehand!

[ChubbyChops]

Have you changed the caps yet?

[Buick Mackane]

If you get stuck post in the repair forum. If you have a working transformer shouldn't be hard to get it up & running, Sureshot is the resident PSU Man for mods and repairs etc

[Mudslinger]

I haven't had chance to have a proper look at it yet. I will "Borrow" some caps from work tomorrow and have a go at it over the weekend. There doesn't look to be much which can go wrong...

[Buick Mackane]

Provided theres voltage from the transformer should be a pretty easy fix, Power transformers are pretty robust

[Mudslinger]

Well at least half of the transformer must be working otherwise it wouldn't be humming.

I have some caps ready to fit, and some spare rectifier diodes, I just hope that it isn't the main transistor as it has an odd part number. It certainly isn't the usual 2N3055

[ChubbyChops]

99% of these I've fixed are just needing new caps.

[Mudslinger]

Thats good news, I will have a crack over the weekend. My 3-5 struggles to power my PC-999 Grant but this supply should be much better in that regard.

[Buick Mackane]

Resorvoir cap(s) could have shorted when it was plugged in, Maybe could have been reformed, But better swapped me thinks

[14CS06]

Hello

CB MASTER 5 A Constant à 7.5 A Surge Power Supply





https://www.ebay.fr/itm/144287089988?ha ... SwoRRhbGbR

@+
Claude

[Buick Mackane]

Best CB power packs were ''mr whoosh power houses'' Blue cases. And a picture of mr whoosh himself scribbled on the front panel..You just don't see quality like that anymore

[Mudslinger]

When I said there was no output I appear to have a dodgy meter lead. It is actually putting out 24v

The output from the transformer inside is 36v (RMS)

I have some new caps which I will put in tomorrow.

[Buick Mackane]

Sounds like a dodgy regulator

[Mudslinger]

That was what i was thinking after doing a bit of internet "resurch". I am wondering of a cap has gone bad and caused the regulator to fail.

The regulator main parts seem to be a pair of transistors. One Large TO-3 type which has the part number BDW21 and is located on the heatsink, and another smaller TO-220 packaged device on the PCB which I am unable to read the numbers on until I remove it.

[Transwarp]

Best CB power packs were ''mr whoosh power houses'' Blue cases. And a picture of mr whoosh himself scribbled on the front panel..You just don't see quality like that anymore

My disgusting pic for tomorrow on the 'Where's Weety ?' topic.