Control 24 completely dead - fuse blown?

[paulmellors]

Incidentally we have now put a APC Smart UPS between the mains and the C|24.

Our Control 24 blew after a mains outage

[mups]

In case someone comes across the same switching power supply failure that I experienced recently after a main AC problem, here's a possible solution.
I removed the blown T5A fuse soldered on the circuit board and from there ran two wires to a standard fuse holder on the back of the PSU rear pannel, which implied drilling through two sheets of metal near the on-off switch. When I turned the board back on, the new fuse blew instantly.
Then I found a hint about checking the PSU FET transistor, which turned out to be kinda loosely bolted onto its radiator, meaning it had probably heated up badly and making it more likely to die when stressed. I replaced it (8€) and the board came back to life ! The specs at RadioSpare are SPW20N60S5, Canal-N, 20A, 600V, A-247.
And I strongly suggest to working Control 24 owners to open the PSU pannel and crank the **** out of all the bolts holding heating componants to their radiators...

[avantipr]

Originally Posted by paulmellors

our thought were that is was better to bite the bullet and get the new unit rather than throwing money at the old one, especially since it seems that the replacement PSU's are not guaranteed to be new units and are often refurbs. Plus they only have a 3 month warranty.

I'm sure we could have got a more cost effective repair by going to an independent repairer but we were already 2 weeks into a dead unit and the time/hassle was a factor (it's not straight forward getting these things moved around the country).

Upshot is, unexpected expense but a much much improved unit. I loved my Control 24 but the C|24 is a different beast.

Paul

A We repair the power supplies contact us: Avanti Power Repairs Ltd, 35A Rowan Road, Tadley, Hampshire, RG26 3RQ, UK
+44 (0) 1189-820 911
[email protected]