IBM 5110 transformer?
mattislind at gmail.com
Mon Sep 30 10:36:02 CDT 2019
Really good point. Thanks! I will check with my friend.
Den mån 30 sep. 2019 kl 16:46 skrev Paul Berger via cctalk <
cctalk at classiccmp.org>:
> On 2019-09-30 3:44 a.m., Mattis Lind via cctalk wrote:
> > A friend of mine is trying to repair a IBM 5110. He is convinced that the
> > transformer is bad.
> > Anyone knows the spec of the transformer?
> > Someone that has a spare?
> > Looking into the tech documentation tell me that the machine requires +/-
> > 5V and +/- 12 V and also +8.5V
> > A very rough guesstimate based on the number of wires from the PSU to the
> > backplane would give 20A 5V, 4A +12V, 4A +8.5V, 1A -5V and 1A -12V.
> > Anyone with a better guess?
> > /Mattis
> Does this transformer has a resonant capacitor on it? They where very
> common on IBM power supplies from that time period and if the capacitor
> goes short you will not get any output from the transformer. This is a
> lesson I learned as a green service rep 40 years ago after lugging in a
> very heavy transformer for a machine.
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