CraigGT
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Posts
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The Normal channel of a Deluxe Reverb uses two triodes before the PI and the Vibrato channel uses three. Every triode stage causes phase inversion and that is why the channels are out of phase and they don't jump well.
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Mine's still in bits I'm afraid, I ended up buying a new one with three years warranty. Craig
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Yes everything else works fine.
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Thanks for your effort and it pretty much confirms my thought that it's the processor board and there's not much that's replicable on there. I was quoted around £400 for a repair, I ended up buying a new one wit three years warranty. Craig
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On a second look you are correct and I do get that 220 Ohm and continuity of the other usb pins too, apart from the screen.
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I traced it out and found similar except I see the ground to pin 5 and shield not connected to the header. Shield and ground have continuity through the MCU board if the header is plugged in. The capacitor you said was grounded both sides and is missing on mine goes between ground and shield so that explains your measurements. I can't find any continuity for the other side of L22. Craig
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Here is the equivalent area from my Helix floor. R349 is 220R, C38 and C316 are 220pF I'm not sure if C8 is my problem or just not populated. One side of C8 is USB ground.
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I have a Helix in a similar state and I've not seen any TVS diodes. There are some passives on the IO board then it's cabled to the CPU board where I can find no continuity so I believe it's connected straight to the BGA processor chip. Craig
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At least he's using the search function :-)
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You can go straight to 3.6
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Also there were Grammatico's before 3.6, It just added an extra one.
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Good advice @mmccain, I think the bigger issue is if it was out of warranty, an authorised service centre would charge for a replacement footswitch pcb. I have the same issue with a DSP board that won't communicate over USB.
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There is a very short cable between the processor board and the screen which powers the backlight, it's possible that it could have become dislodged.
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Good point, I guess it landed at a more convenient time here in the UK.
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I'm not sure what went wrong but the cabs are in the firmware not your backup. That only contains your presets and settings.
