1024MAK wrote:C101 (0.47uF / 250V) is there to help suppress mains spikes and reduce unwanted noise and interference (both into and out of the PSU). As long as it is not short circuit it will not stop the power supply from working. The most basic test is to unsolder it and then test on resistance with a meter. You should get a very brief low reading which quickly goes to a very high resistance reading. If your meter has a capacitance range, test it on this range. If not you could buy / beg / borrow a meter with a capacitance range or buy / beg / borrow a capacitance meter. However considering the cost of a replacement (less than £2), you could just replace it.
The PC101 could well be hard to find!
Have you tried searching the internet for it?
Later I will see if I have time to post some links to electronic part suppliers.
MRAtari wrote:also i did wonder would the CNY 65 from an Atari PSU work too? it should as i once saw a PC 101 used in an Atari PSU!
the pins actually line up to!
just thought too, the DSP 508A PSU has a CNY17-3 which looks similar to the one you mention above, would this work? as i have some of those and they are very cheap and easy to get too
thanks for your help Dave
R102 (I can't see it, I'll guess it is about 330K ohms) is the closest thing to a start-up resistor here (runs too).
MRAtari wrote:if R101 and R106 are dead then Q1 / Q2 and PC 101 will be dead too
repaired loads of these and it was always those parts go together
if you don't replace PC 101 and do replace the others you will blow all the new parts again! so replace those 5 parts
i used a CNY65 in place of the PC 101 you just have to fit it in with the writing upside down compared to the original PC 101
you can't get PC 101 but CNY65 are easy
MRAtari wrote:never seen R114 or D105 go but hey if you replace them with the same or compatible parts then ok
test it under load formatting a disk and adjust the 5v pot to get it at 5v
then let it run for 30 mins or so
Jorevall wrote:This tread might be old..
I'm having an issue with a PSU, I do have +5 and +12, but when loaded via a 1040STe, the voltage drops, I have maximized the pot för the opto part..
Switched PSU have never been fun to repair, but does anybody have a clue where to look?
I have checked all the caps, and only the 1u/50 inte opto part had a low value, but that did not change anything..
Thanks in advance..
( I tried a spare falcon psu, and that was dead on +5v while loaded in the STe.. )
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