Deacon Problems
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?
Top of the page Bottom of the page
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
Top of the page Bottom of the page
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.
Top of the page Bottom of the page
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 :-))
Top of the page Bottom of the page
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.
Top of the page Bottom of the page