Really good point. Thanks! I will check with my friend. /Mattis
Den mån 30 sep. 2019 kl 16:46 skrev Paul Berger via cctalk < [email protected]>: > > 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. > >
