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hammond A100 - drawbar stuck on (when turned off)

 
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joninc
carpal tunnel


Joined: 09 Jun 2003
Posts: 1689
Location: canada

PostPosted: Mon Sep 12, 2016 5:36 pm    Post subject: hammond A100 - drawbar stuck on (when turned off) Reply with quote

yeah, it sucks. on the upper manual, right hand manual preset (Corresponds with B- far rightmost preset) - there's a 5th harmonic overtone getting through somehow when all the drawbars are turned off.

On the other manual preset (Bb) - it's fine.

On the lower manual (both setting) - it's fine.

Any ideas of how to fix or trouble shoot this issue. Just started in the past few weeks.

DANG IT
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analogika
alignin' 24-trk


Joined: 17 Aug 2013
Posts: 61

PostPosted: Tue Sep 13, 2016 11:53 am    Post subject: Re: hammond A100 - drawbar stuck on (when turned off) Reply with quote

Does switching percussion on/off have any influence?

Usually, percussion is triggered off the topmost (1') drawbar, which is the sixth harmonic, I guess. When percussion is switched on, that drawbar's harmonic is killed.

I've heard of mods that restore the harmonic even when percussion is on, or that route it to a different drawbar in order to enable the octave overtone - maybe something shorted there?
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Nick Sevilla
speech impediment


Joined: 03 Mar 2008
Posts: 4453
Location: Los Angeles California USA

PostPosted: Wed Sep 14, 2016 12:18 pm    Post subject: Re: hammond A100 - drawbar stuck on (when turned off) Reply with quote

This usually indicates a partial short in that circuit.

Thankfully, these are built like ancient cars, where it is easy to trace a problem on an individual button or drawbar.

As analogika stated, try switching on / off the percussion section, and se if that influences at all.

http://theatreorgans.com/hammond/faq/a-100/a-100.html

That has all the service manuals, plus some experts on all things Hammond. I am sure if you are patient, you can fix it yourself.
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joninc
carpal tunnel


Joined: 09 Jun 2003
Posts: 1689
Location: canada

PostPosted: Mon Sep 19, 2016 8:05 pm    Post subject: Re: hammond A100 - drawbar stuck on (when turned off) Reply with quote

thanks guys - it was related to the percussion. Instead of being set for a quick short burst at the start of the note it was set to wide open sustain!
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