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Deacon Problems

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raf
Posted 2020-04-23 1:41 PM (#551932)
Subject: Deacon Problems


Joined:
January 2017
Posts: 7

Hi All,

I have a mid 70's Deacon (humbuckers) which I'm trying to sell, I've had it up for sale since October and I tested it then and it was all working and it's been in the case since but someone contacted me the other day who is interested in it so I took it out put a couple of batteries in it and no output.

If I crank the volume up from the noise I can hear the volume, tone and notch filter are working but a very very low virtually inaudible level from the pups if I tap them with a screwdriver, I'm assuming one of the transistors has probably gone faulty so I guess I'll need to remove them from the PCB and test them, any other ideas on what it might be?
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raf
Posted 2020-04-24 1:22 PM (#551942 - in reply to #551932)
Subject: Re: Deacon Problems


Joined:
January 2017
Posts: 7

Further testing reveals the JFET Q3 is faulty as I have no continuity between the gate and the source or drain in either direction, so I'll need to source a replacement.

Edited by raf 2020-04-24 1:46 PM
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raf
Posted 2020-04-24 3:57 PM (#551943 - in reply to #551932)
Subject: Re: Deacon Problems


Joined:
January 2017
Posts: 7

More testing reveals all 3 FET's are faulty, Q1 has continuity in both directions from gate to source & drain while Q2 has no continuity either way.
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raf
Posted 2020-04-29 11:58 AM (#551979 - in reply to #551932)
Subject: Re: Deacon Problems


Joined:
January 2017
Posts: 7

I've replaced the FET's and all now appears to be working :-))
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numbfingers
Posted 2020-04-30 9:30 AM (#551993 - in reply to #551979)
Subject: Re: Deacon Problems


Joined:
January 2006
Posts: 1094

Location: NW Washington State
I was going to reply to your earlier posts, got here and see that you fixed it.

Anyway, here's a thread with links to schematics:

http://www.ovationfanclub.com/megabbs/forums/thread-view.asp?tid=32...

Steve W.
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