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B3 percussion doesn't decay

 

I installed a ZD-1 overdrive in the lower left cheek block and all is okay except now when percussion is turned on it doesn't decay.? ?I checked the voltage on the AO-28 K terminal (per ) and it immediately goes to 0 volts when the percussion switch is turned on.
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The installation of the ZD-1 was straightforward, and I don't think anything was damaged in the process.? It does require unbolting the large hex head bolts that hold the manual assembly in place, and then lifting it to unbolt the cheek block and then replace it.? Both manuals need to be tilted up at various points in the install to either install of the ZD-1 or route the cable from it to the AO-28.? I took some care in the process but at one point or another probably jarred the manual assembly a bit lifting and positioning it.
?
The unit also has a Trek reverb bolted to the inside top of the cabinet on the start/run switch end.? Lifting the manuals could cause a few upper drawbars to contact the reverb, but there is no damage there or anything bent.
?
Before I go further per the Dairiki instructions, any suggestions from the collected wisdom here?
?
Thanks,
Dave
 

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Sound to me like the process has disturbed things inside the upper manual or Perc switch assembly. My bet is there¡¯s now a partial short in the manual, so to check I¡¯d desolder the white wire from the lower left lug at the resistor panel attached to the rear of the upper manual. Then measure resistance from that lug to ground. If it¡¯s not very very high then zap the lug.

On 28 Feb 2025, at 7:25 am, david_l_manley via <david_l_manley@...> wrote:

I installed a ZD-1 overdrive in the lower left cheek block and all is okay except now when percussion is turned on it doesn't decay.? ?I checked the voltage on the AO-28 K terminal (per ) and it immediately goes to 0 volts when the percussion switch is turned on.
?
The installation of the ZD-1 was straightforward, and I don't think anything was damaged in the process.? It does require unbolting the large hex head bolts that hold the manual assembly in place, and then lifting it to unbolt the cheek block and then replace it.? Both manuals need to be tilted up at various points in the install to either install of the ZD-1 or route the cable from it to the AO-28.? I took some care in the process but at one point or another probably jarred the manual assembly a bit lifting and positioning it.
?
The unit also has a Trek reverb bolted to the inside top of the cabinet on the start/run switch end.? Lifting the manuals could cause a few upper drawbars to contact the reverb, but there is no damage there or anything bent.
?
Before I go further per the Dairiki instructions, any suggestions from the collected wisdom here?
?
Thanks,
Dave

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