Fender HRD Randomly switching channels

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MatthewShredderyMatthewShreddery Frets: 697
edited June 10 in Amps
My HRD is randomly going from clean to the drive channel all of it's own accord - I don't even have the foot switch for the thing!
I know this is a fairly common problem with these amps - was wondering if there was a simple way to completely detach the drive channel from the amp so there's no possibility of it switching to it?

I've noticed that if I half plug a jack lead into the foot switch socket, the problem seems to go away, but I want piece of mind in case I wish to use this amp at gigs in the future.

Thanks in advance
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  • ICBMICBM Frets: 55409
    It will be a broken solder joint on either the footswitch jack or the resistor which feeds it, which gets hot enough to cook the solder. It's easier to fix it properly than to disable the switching, although it does mean getting the PCB out.

    The resistor in question is the large peach-coloured one at the top left of the PCB. Even at this photo resolution you can see a brown patch at each end of it where the board has started to cook...


    "Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski

    "Just because I don't care, doesn't mean I don't understand." - Homer Simpson

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  • Which photo mate?
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  • ICBMICBM Frets: 55409
    Link not showing? It's working fine here... on computer and phone.

    Or Google image search 'fender hotrod pcb' and look at the second pic, at studiorepair.com.

    If you can't see it, just take the back off the amp, you'll easily find it - it's a large-ish pinky/peach-coloured resistor on the edge of the board just below the footswitch jack.

    "Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski

    "Just because I don't care, doesn't mean I don't understand." - Homer Simpson

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  • Cheers ICBM. I'll take a look next weekend
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  • 26.226.2 Frets: 69
    They all do this eventually. Maybe it’s fixed on Mark 4?
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