Fender Frontman 15G

[T. Burton]

This unit has full on uncontrollable audio at turn on. A schematic
would sure help. Originally found audio opt ic shorted. TDA2050 and
changed it.Have checked pots and pc traces around them. Can ground pin
1 input to TDA22050 and stop full on. Any help appreciated.

 

[Udo Piechottka]

Look for disconnected ground on volume pot.

- Udo

 

[Steve]

T. Burton wrote:

This unit has full on uncontrollable audio at turn on. A schematic
would sure help. Originally found audio opt ic shorted. TDA2050 and
changed it.Have checked pots and pc traces around them. Can ground pin
1 input to TDA22050 and stop full on. Any help appreciated.

There is a schematic available here: http://www.mrgearhead.com/

Good luck,
Steve

 

[Udo Piechottka]

Steve schrieb:

There is a schematic available here: http://www.mrgearhead.com/

If the sound is driven through the normal channel, check R13 and its ground
connection.
If your amp can be controlled by the drive channel when the gain pot it set
to zero, check R23 & ground.

-Udo

 

[Asimov]

"Udo Piechottka" bravely wrote to "All" (25 Mar 04 14:20:44)
--- on the heady topic of "Re: Fender Frontman 15G"

UP> From: Udo Piechottka <ifmd.messdatensysteme@t-online.de>

UP> Look for disconnected ground on volume pot.

UP> - Udo

If the pot terminal is soldered directly to the pcb then check for a
crack in the solder near or on the pad. Find the break first to be sure
it's the right failure, then clean and reflow with new flux solder.