PET 2001 transformer

[Bokassa]

I decide do repair one PET 2001 chiclet, but I dont have original transformer. I could order new one, but I dont know how many ampers I need at secondary side of transformer (8+8V for computer and 16V for monitor). Please help.

 

[A4000Bear]

Have a look at this thread where I had to repair a PET 2001 with a missing power transformer. Could not find a direct replacement, so I had to improvise. http://www.vintage-computer.com/vcforum/showthread.php?39578-Another-PET-2001-8-for-restoration

 

[KC9UDX]

And please be patient with the forums whilst you are moderated for having too few posts. Too many people give up and leave too soon.

 

[Bokassa]

Have a look at this thread where I had to repair a PET 2001 with a missing power transformer. Could not find a direct replacement, so I had to improvise. http://www.vintage-computer.com/vcforum/showthread.php?39578-Another-PET-2001-8-for-restoration

THanks to information from your topic, I ordered transformer from local company. So here it is. Fitting perfect.

 

[alxnexus]

THanks to information from your topic, I ordered transformer from local company. So here it is. Fitting perfect.
View attachment 26857

Bokassa,

Having the same problem. Can you let us know from whom you bought the transformer from and has it worked for you as expected?

Alex

 

[spucci278]

Yes please let us know!

 

[JonB]

Hi

How is the transformer wired? I have a 3016 PET here with a massive transformer, labelled P/N 320198-03. The schematic is http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001N/320349-9.gif

The transformer's pins are labelled:

4 6 7
5 9 10 8

7 & 8 = 15.3vAC to monitor, brown wires

4 & 6 = 16vAC to mainboard J7, pins 1&5, brown wires
9 & 10 = 16vAC to mainboard J7, pins 8&9 grey wires
5 = GND to mainboard J7, pin 6, black wire

The GND seems to be a centre tap for 4&6 and 9&10 as when I measure across it and any of 4,6,9,10 I get 8vAC. Would this be correct? It would look like this diagram:



The other question is about this transformer that Bokassa managed to acquire. It looks like my schematic, save that it has a single 14v winding with a centre tap, which isn't quite like the original - it woud require the 7-0-4 winding to be connected to both inputs of the logic board (on J7, connect 14vAC to pins 1 & 5, then 1 to 8 and 5 to 9 so both inputs are fed from the same winding).

 

[JonB]

I also have a Commodore dual floppy drive, model 8050, waiting for an overhaul. I bought this some time ago and put it to one side. AnywY, it seems to have a similar transformer inside it which I could borrow:

http://www.devili.iki.fi/Computers/Commodore/8050/Service_Manual/page_28.html

It's only got two secondaries but the voltages are correct. The only problem with it is the way it bums loudly. I think it would annoy me!

 

[dave_m]

The only problem with it is the way it bums loudly.

Torque down the bolts to squeeze the laminated plates, and perhaps add fiber washers to act as shock mounts. That should help the hum.

 

[JonB]

Oh well, here goes!

http://www.vintage-computer.com/vcf...ore-PET-power-transformer&p=397918#post397918

Worth a punt...