I'd look for a cold solderjoint or the like. Do you have the manual? If not,
it is online at TenTec's website; going through the listed DC voltages may shed
light as to where the problem is.
Shawn Upton, KB1CKT
NAQCC 4723
--- On Sun, 7/24/11, John Robertson <johnrob281@hotmail.com> wrote:
> From: John Robertson <johnrob281@hotmail.com>
> Subject: [TenTec] Help for Century 21 with no sidetone
> To: tentec@contesting.com
> Date: Sunday, July 24, 2011, 11:50 AM
> Needing some troubleshooting help for
> Century 21 Analog.
>
> I recently received a Century 21 but the sidetone is not
> working.
>
> The rig sends a carrier just fine, but I can’t hear the
> sidetone at all. I’ve turned the volume pot at the
> bottom of the board from turn to turn and it has no effect.
>
> The schematic shows some possibilities; the LM3900, the
> LM380 or perhaps the C2 cap.
>
> Anyone have any suggestions on where to start or you may
> know of something I’ve overlooked.
>
> As you know, the parts are inexpensive, but the shipping
> from Mouser will be the same if I need to consider something
> else so I want to make sure to cover other possibilities.
>
> Any suggestions and help will be much appreciated.
>
> Thanks
>
> John/W5CYF
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> TenTec@contesting.com
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>
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