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Post subject: No drive select on Frontman 25r
Posted: Fri May 25, 2012 7:46 am
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Joined: Fri May 25, 2012 7:21 am
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I have a Frontman 25r amp and the drive select does not work from the switch or the footpedal. The crunch channel is always on. I tested the pedal and the switch for continuity, and both work fine. Any suggestions on troubleshooting this problem? Perhaps U5 or D7 or 8?

Thanks!


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Post subject: Re: No drive select on Frontman 25r
Posted: Fri May 25, 2012 11:02 am
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An added note- The LED indicator DOES respond then to switch is depressed, but the amp still stays on the crunch channel.


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Post subject: Re: No drive select on Frontman 25r
Posted: Fri May 25, 2012 12:20 pm
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Location: Natural Bridge, Virginia
Here's the schematic. Good luck.

http://support.fender.com/schematics/gu ... ematic.pdf

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Post subject: Re: No drive select on Frontman 25r
Posted: Fri May 25, 2012 12:26 pm
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I do have the schematic, and seeing the LED is responding, I am thinking the problem might be further along the circuit- Maybe R54, Q1 or something in that area.


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Post subject: Re: No drive select on Frontman 25r
Posted: Sat May 26, 2012 4:21 am
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Professional Musician
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Joined: Sun Dec 19, 2010 12:00 pm
Posts: 1389
Does the LED D25 and 26 are glowing ?
:)

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