Doepfer

I installed a new A-113 Subharmonic Generator, which worked normally 
during brief testing. Then I installed (connecting the power cable 
correctly) a Plan B Model 12 filter. On power-up the fuse on the A-
100G6 blew. I removed Model 12 and replaced the fuse. Now the A-113 
doesn't work correctly: It tracks incoming pitch (without dividing) 
outputting a sawtooth wave; knobs affect volume. However, all leds are 
constantly lit and the buttons don't work - I can't set the divisors or 
call or save presets. Oddly enough the Plan B Model 12 works.

If I substitute the A-113 with an A-190 (which also requires additional 
+ 5V from the Low-Cost Adapter) at the same power slot, it works OK. I 
have PSU2.

I wonder, if some kind of resetting or other easy fix is possible?


Best regards
Jari Jokinen

> I installed a new A-113 Subharmonic Generator, which worked normally
> during brief testing. Then I installed (connecting the power cable
> correctly) a Plan B Model 12 filter. On power-up the fuse on the A-
> 100G6 blew. I removed Model 12 and replaced the fuse. Now the A-113
> doesn't work correctly: It tracks incoming pitch (without dividing)
> outputting a sawtooth wave; knobs affect volume. However, all leds are
> constantly lit and the buttons don't work - I can't set the divisors or
> call or save presets. Oddly enough the Plan B Model 12 works.
>
> If I substitute the A-113 with an A-190 (which also requires additional
> + 5V from the Low-Cost Adapter) at the same power slot, it works OK. I
> have PSU2.
>
> I wonder, if some kind of resetting or other easy fix is possible?
>
> Best regards
> Jari Jokinen

From the distance it's difficult to find out what's wrong. It seems that the
processor of the A-113 (PIC16F73) does not work. Normally I would assume
that the +5V are not OK but you mentioned that an A-190 is working perfect.

As far as I know the Plan B bus cables have to be connected i the opposite
way (i.e. colored wire on top). But this is not for sure. I only heard about
that. I'm sure there are some users in the group who use Plan B modules and
know details. Maybe the wrongly connected Plan B module destroyed a part of
the A-113. In any case the blowing of the fuse is a signal that something
was wrong.

In addition I'd recommend to look if there is a mechanical fault. As far as
I remember we had e.g. some mechanically broken X-TALs (this is the metallic
electronic part above the PIC at the pcb edge). But as the A-113 was already
working I don't think that this is the reason. The next step would be the
replacement of the PIC. If this does not help the module has to be sent in
for repair. Please contact the dealer where you purchased the module for
details of the spare parts/repair procedure.

Best wishes
Dieter Doepfer