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From: Chuck on 7 Jun 2010 17:42
Hello.

I used to work for an Adcom warranty station and remember this was a
common problem but I can't recall what the cure is. If anyone has a
solution I'd really appreciate it. Thanks. Chuck
From: Chuck on 14 Jun 2010 13:50
On Mon, 07 Jun 2010 16:42:13 -0500, Chuck <chuckh(a)deja.net> wrote:

>Hello.
>
>I used to work for an Adcom warranty station and remember this was a
>common problem but I can't recall what the cure is. If anyone has a
>solution I'd really appreciate it. Thanks. Chuck

The problem turned out to be conductive glue on the ribbon cable from
the on-standby switch to the upc board. It wasn't visible from the
top of the unit. I found a pin out of the upc and noticed unusual
activity on the key lines. This activity ceased and the unit
functioned properly when the cable from the switch was detached at the
upc board. When I removed the switch from the circuit board, I
noticed a wisp of conductive glue at the cable end. Once the glue was
removed, the unit functioned normally. Chuck
From: Allyn Oldfield on 26 Jun 2010 01:40
On Jun 15, 5:50 am, Chuck <chu...(a)deja.net> wrote:
> On Mon, 07 Jun 2010 16:42:13 -0500, Chuck <chu...(a)deja.net> wrote:
> >Hello.
>
> >I used to work for an Adcom warranty station and remember this was a
> >common problem but I can't recall what the cure is.  If anyone has a
> >solution I'd really appreciate it.  Thanks.  Chuck
>
> The problem turned out to be conductive glue on the ribbon cable from
> the on-standby switch to the upc board.  It wasn't visible from the
> top of the unit.  I found a pin out of the upc and noticed unusual
> activity on the key lines.  This activity ceased and the unit
> functioned properly when the cable from the switch was detached at the
> upc board.  When I removed the switch from the circuit board, I
> noticed a wisp of conductive glue at the cable end.  Once the glue was
> removed, the unit functioned normally.  Chuck

Hi

Thanks for posting this thread- I just fixed a similar problem with my
adcom GTP-450, I initially thought power supply caps, but after
replacing several of the smaller caps and all the regulator output
caps I googled and found this. Eventually it turned out to be the
power switch itself in my case. A momentary power switch from an old
ATX computer case had the correct stem for the button, and the wires
from the ATX switch replace the factory ribbon cable. I unsoldered the
old switch, and held the new switch in place with some epoxy resin and
a couple of screws- good as new!

Cheers
Allyn
From: Chuck on 5 Jul 2010 08:38
Allyn Oldfield <allyn.oldfield(a)gmail.com> wrote:
> On Jun 15, 5:50 am, Chuck <chu...(a)deja.net>

>> On Mon, 07 Jun 2010 16:42:13 -0500, Chuck <chu...(a)deja.net> wrote:
>>> Hello.
>>
>>> I used to work for an Adcom warranty station and remember this was a
>>> common problem but I can't recall what the cure is. If anyone has a
>>> solution I'd really appreciate it. Thanks. Chuck
>>
>> The problem turned out to be conductive glue on the ribbon cable from
>> the on-standby switch to the upc board. It wasn't visible from the
>> top of the unit. I found a pin out of the upc and noticed unusual
>> activity on the key lines. This activity ceased and the unit
>> functioned properly when the cable from the switch was detached at
> > the
>> upc board. When I removed the switch from the circuit board, I
>> noticed a wisp of conductive glue at the cable end. Once the glue
> > was
>> removed, the unit functioned normally. Chuck
>
> Hi
>
> Thanks for posting this thread- I just fixed a similar problem with my
> adcom GTP-450, I initially thought power supply caps, but after
> replacing several of the smaller caps and all the regulator output
> caps I googled and found this. Eventually it turned out to be the
> power switch itself in my case. A momentary power switch from an old
> ATX computer case had the correct stem for the button, and the wires
> from the ATX switch replace the factory ribbon cable. I unsoldered the
> old switch, and held the new switch in place with some epoxy resin and
> a couple of screws- good as new!
>
> Cheers
> Allyn

Glad to have helped. Chuck
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