Re: L100 Percussion circuit trouble

[olle siljeholm <olle.orgel@bigprint.ericsson.se>]

Magnus Enorson wrote:
> 
>         Greetings fellow Hammondites
> 
> Yesterday I went to take a look at a friend's L100 which was having some
> trouble with the percussion circuit.
> 
> When I got there, the top manual was making thunder noises only (no sound),
> unless percussion was switched on, which caused a VERY loud perc tone, with
> a great deal of thunder to accompany it.
> 
> I followed the signal chain to make sure the problem was really located in
> the perc unit, and then took out and cleaned the connectors of the 12AX7
> tube in the circuit. This restored the signal to normal when percussion is
> switched OFF, but I still get loud thumps when operating any of the
> percussion switches, as well as the vibrato/chorus switch which is also
> connected to the perc circuit. Also the percussion only works with slow
> decay and normal volume, if I switch to fast decay and/or volume soft, the
> top manual goes dead again.
> 
> all connectors and all the switches are OK (I checked.)
> 

I have the EXACT same problem with my M111.
I managed to reduce *some* of that thumpnoise with
adjusting the perc trigger pot. and use SOFT VOLUME.

> Question: what do I do next? All suggestions greatly appreciated.

 d:o

> 
>         Thanks in advance, Magnus
> 
>         Samuel (the owner) says thanks too
> 

/Olle