[TechAssist] Re: 2nd request Fisher AMP CA-9025
- From: Doug <dek@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 22 Sep 2001 11:20:19 -0400
Jeff,
Is there a protection circuit in that? (heat, overcurrent, etc) The
Peavey amps that we used in the band would sometimes blow those, then be
as if dead.
Doug
Jeff Dougherty wrote:
>
> Thanks to Don for faxing me the schematic. Some of the info is hard to read.
> (Original info below)
> If I jump the relay, I do have 60v on output transistors and on main big
> capacitors, but it still appears to be in stand by mode.
> Any other suggestions before I give up on this one?
> Jeff www.9-11-2001tragedy.com
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> Intrepid Video & Electronics
> Harrisburg, PA 17111
> 717-909-8844
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>
> First, pressing power only lights the power standby light. Power LED is not
> lit.
> Power button is push switch, so no micro.
> Power Relay, no click, has 12 vdc on each side to ground, AC side has
> 120vac.
> Output transistors are not shorted and do not test open. Two small
> transistors, on same heat sink measure about 40 ohms from base to coll.
> I did not find any open resistors, shorted caps, or open/shorted diodes, of
> course, I may have missed one.
> Heat sinks all check OK, no open traces and I looked very closely.
>
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