30 Sep
2019
30 Sep
'19
8:36 a.m.
Really good point. Thanks! I will check with my friend.
/Mattis
Den m?n 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.
Paul.