Carvin r1000 fan not working

[nosaj]

I've got this Carvin r1000 where the fan does not kick on. This is a gigging amp run hard 4-5 hrs at a time. i used a bench supply and the fan does work. Where would be a good location to just wire the fan always on?

Thanks,
nosaj

[The Dude]

I'm not seeing the fan on the schematic- only "fan ground". Am I missing it, or is it not there?

[nosaj]

H12.1 and H12.B is the fan connection
H13.A and H13.b is not used.

nosaj

[The Dude]

I see a -12V regulator and Q301 off the -24V line. This would be where the fan supply comes from. First make sure the -24 supply is up and working and that something isn't loading it down. You want to make sure the regulator and transistor aren't shorting the supply to ground. Is there a voltage rating printed on the fan?

Edit: I understand you just want the fan to run all the time, but I'd first make sure that -24V supply isn't shorted. You don't want a short to do more damage to the amp.

[Jazz P Bass]

So, what is bad in that circuit.
The 7912 should provide -12Vdc for the fan.

[g1]

I'd be surprised if there is not some kind of thermal tracking that also triggers the protection circuits (relays?).
What are T1 and T2 ahead of IC A20 ?

[x-pro]

g1, D106

[nosaj]

Voltage good. Pin connector bad connection. Now running full time.

nosaj