28 Aug
2014
28 Aug
'14
12:06 p.m.
On 28/08/2014 18:53, Robert Jarratt wrote:
There are two outputs from the PSU that I don't
fully understand, one is P
OK, I am guessing that means *something* is OK, but not sure what, power
perhaps, but what power?. The other is called LTC, I have no idea what that
one means. Can anyone enlighten me?
'P OK' is indeed power OK. This signal will be asserted once all the
power supply outputs have reached their normal operating voltage. The
Qbus devices will be held in reset until this signal is asserted.
'LTC' is the mains derived line time clock (50hz here in the UK).
Have any of the internal fuses (or circuit breakers) blown? Don't
replace then until you find the real problem. I would probably start by
checking the bridge rectifier and main switching transistor for shorts.
Matt