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From: Ron on 9 Aug 2010 09:36
On 09/08/2010 13:10, Arfa Daily wrote:
> Anyone know the correct voltage for the fan fitted to these? Just had
> one in with a new (??) fan hanging loose in it. Job ticket claims that
> the owners replaced the fan, and then it smoked ... I'm not sure what
> they had done, but they had twatted a set of o/p tr's on each board, and
> the smoke had come from one of the 0R22 emitter resistors, due to the
> 15A fuses that had been fitted ... :-(
>
> Anyways, amps all repaired now, but their new fan, which is 24v, seems
> reluctant to start. Measuring quickly across it, shows just about
> exactly 12v. Haven't got full schematics that show the fan connection,
> so without pulling the board that the fan is connected to all back out
> to follow print around, I don't know if it is a 'controlled' fan, and
> there is something wrong with the controlling circuit, or whether it's
> right, and the fan doesn't actually start until the thing hots up a bit,
> or whether it should be a fixed 12v fan, and they've just got the wrong
> one.
>
> Funny isn't it. I repair loads of HK PA amps - Actors and Lucas's and
> these, and I've never noticed what voltage the fan is. But I'm pretty
> sure from memory, that they usually run at full chat all the time, as
> I'm also pretty sure that they normally start up at quite a low input
> voltage, when you are bringing a repaired one up on the variac.
>
> So, anyone know for sure ?
>
> Cheers
>
> Arfa

Which diags do you have? Mine are dated 30.5.2000. there's a fan plug
connected to pin 6 on connector FCC16 via aa IN4007 and a 150R 5watt
resistor (R85). Pin6 would appear to go to an AC side of the bridge
reccie via a 10R 1 watt (R3)

Any help? I can send you these dags if they will be of use.

Ron
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