Archived posting to the Leica Users Group, 1999/08/18
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>
> Javier Perez wrote:
> >
> > Hi All
> >
> > I've got a problem with an R4 motor drive
> > and was hoping someone could help.
> > Years ago while experimenting I tried to connect a power source
> > to the accessory jack and blew the thing.
> > It only works on single or 4 fps modes and the
> > double exposure beeper stays on all the time.
> > as a quick fix I disconnected the Piezo beeper
> > back then but now I'de like to get the thing working for real.
> > Inside I noticed 2 miniature surface mounted 14 pin DIPS
> > labeled 4011BT and 4093BT. After some searching
> > I managed to trace these to Philips. Both are quad double input nands with
> > the
> > 4093 having a shmidtt trigger built in.
> > Since all the diodes and passive components test out ok I
> > assume that one or both of these chips are responsible.
> > So here's my question.
> > Does anyone know which one of these would cause the problem?
> > Also, anybody got some for sale?
> > Finally, In case the repair fails
> > Dioes anybody have a really beat up but electronically ok R4 drive for sale?
> > Please let me know
> > Best Regards
> > Javier
> No Archive
Dear Javier,
I have 2 original service-diagrams (overall diagram and wiring-diagram) of the
R4-motor drive. I can scan these and send you these privatly.
Interested? Let me know.
With kind regards.
- --
Fred Hess
Den Haag NL
tel +31 70 3258312
fax +31 70 3258634
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_o With both feet
_-\<,_ on the ground
(_)/ (_) you won't get far...?!
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