Doepfer

TD,

replacing the power supply should not be necessary. In any case you have to
pay attention that the correct fuse (250mA for the standard PSU, 500mA for
PSUII) is used and it has to be time lag/slow blow in any case. I have sent
another message to the group to find out how the fuse response
(fast/medium/slow) is marked in USA as I only know the type of marking for
German fuses. It is also no problem if you use a little bit higher fuse
value (e.g. 315mA or 400mA instead off 250mA, 600 mA or 700 mA instead of
500 mA), but not more than ~ 50% more than the suggested value (in case of a
short circuit the fuse will blow even the value is a bit higher than the
suggested value). We took the fuse values from the data sheet of the
transformer manufacturer. Though we never had a blown fuse here in the
company (provided that everything was OK with the PSU and the modules) the
fuse values given by the transformer manufacturer maybe a bit too
conservative.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von Tommy DOG
> Gesendet: Samstag, 4. Februar 2006 23:47
> An: Doepfer_a100@yahoogroups.com
> Betreff: [Doepfer_a100] Fuse blowing again.
>
>
> After a few weeks the fuse in one of my racks blew again.
> I checked the modules, switched back the only two that had
> changed places in the rack for
> good luck and blew another one upon power up.
>
> Aside from two modules being switched in the bottom row with each
> other, nothing has
> been added to this rack since the 198 came out. It has neer acted
> uo or been a problem.
>
> I spoke to Analog Haven who were very nice, informed and
> supportive and they made
> some suggestions but I am still at a loss.
>
> Should I replace the power supply?
> Can I do this myself?
> Should I just buy a lot of fuses and take modules and plug them
> in 1 by 1 unitl something
> blows?
>
> Help,
> TD