did some IBM XT units use AC fans? \ VOGONS

did some IBM XT units use AC fans?

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First post, by lowlytech

Posted on 2018-06-17, 00:06

lowlytech Offline

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I have an earlish 5160 that the previous owner had replaced the fan. They spliced into the 5 volt line to power the fan (a 12VDC). I was going to try to clean this up while I am recapping it, so naturally I am looking where the fan originally plugged into the board I can only find a quick detach type of connector on a smaller board that has nothing plugged into it that outputs 120VAC. Did IBM use some power supplies with AC powered fans? I looked at a schematic for a 5160 PS and it shows the fan connecting to a 12 VDC line. My power supply model is Astec AA12150 / IBM PN 1501439 and I can find a date on one of the circuit boards of 1982.

Reply 1 of 3, by cyclone3d

Posted on 2018-06-17, 00:56

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I used to have a couple 120v AC fans that I pulled out of old XT style case power supplies way back in the day so it is possible.

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Reply 2 of 3, by BeginnerGuy

Posted on 2018-06-17, 03:11

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ASTEC power supply? I wonder if you have an original "defective" model like ours was.

I'm 99% sure my XT had a 115V fan in the power supply, the power supply was recalled because there was something up with the model they used. I remember quite clearly being made to check out something with the Sanyo brand fan before bringing it in.

If I dig anything up on that I'll post it, it's surely not my imagination acting up 😜

edit: check this out on 86-12-13 p4 (340 of 384 in the pdf page counter)
http://bitsavers.trailing-edge.com/pdf/ibm/pc … anual_Jul89.pdf

Maybe with a little luck you can at least find your fan part number in there you can use to further hunt down schematics. I don't have my XT anymore to check =\

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Reply 3 of 3, by lowlytech

Posted on 2018-06-17, 15:10

lowlytech Offline

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Thanks for confirming with me about the AC style fan. I ended up sourcing a Papst AC fan that I think will physically fit, now just got to find the connector that fits the two pins.

Interesting about the recall/replacement on that notice. I can't tell if it had a Sayno fan or not since it was already swapped for a DC fan, but the power plug sockets on the back are indeed silver rivets. The only other thing I noticed that was strange was one of the high wattage resistors was so loose it almost fell out while I had the board out when swapping out the capacitors.

I wonder what the original cause of replacing the whole power supply was?

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