Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

1 Answer

Fender Hot Rod Deluxe Footswitch

The Clean, & Drive Channels work fine Manually, but when I plug the footswitch CABLE ONLY into the Amp, it alone switches the amp into Hot Drive. When I remove the known good cable, the manual controls return. When the footswitch is plugged into the cable and to the amp, it doesn't fuction, no lights, no response. Any thoughts?

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  • jh955 Jan 03, 2010

    Yes, I forgot to mention I am the original owner, the cable and footswitch came with the amp.

    I've reviewed the schematics and the voltage to the footswitch out jack to the cable should be 11.2v ac as measured on the board. I had 0 volts, and is why the cable shift to full O.D. as suggested. Hence, I've determined the problem to be a bad amp. side output jack connector.

    I replaced the jack assembly with a n.c. jack connector and the footswitch is now working again.

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  • Fender Master
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Main thing to verify is that the particular footswitch and cable you have is specifically for that amp. If it is not the right one, that is your problem as there is very little compatibility among footswitches.
Looking at the schematic, plugging in JUST the cable shifts operation as you observed. This uses a crazy circuit in which AC is applied on the cable and the footswitch has a diode each direction that causes the amp to shift between the states. when you plug a bare cable in, it disconnects the internal diodes and switches for control at the amp, hence the signals float.
You should investigate the footswitch to make sure it is the right type with the diodes resistors and caps that is for the Fender Deluxe.

You can find the schematic for the amp here:

http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_Deluxe_Schematic.pdf

Look at the circuitry of the switches on the schematic at C8. Your pedal should have similar circuitry. Assuming your cable is good, the problem would be in the pedal itself.

Posted on Jan 02, 2010

  • Fred Yearian Jan 03, 2010

    Yes, those JACKS are tender...



    Hint: Always loop your cables through the handle or secure them some way as when they get tripped over and yanked sideways the jacks get broken. Just replaced one the other day for a friend.



    In his case, it was an input jack and the R of the TRS jack had broken which allowed the shorting switch to mostly remain on grounding out his input.

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