Clint,
Thank you for the response. I found the T-32 circuit on MarkD's site.
If the T-20 is similar (&, of course, IF I have read it correctly!) it
would explain the low (safe?) volts on the X contact. The 'common gate'
network around Q303 (scr) isolates the trigger cap from the outside &
D302 (zener- 12v I think) prevents the X contact voltage from
exceeding 12v.
my concern with the higher volts (250v) on the 310 comes from my
needing to take the top off my OM40 to replace the SCR in the hotshoe
PCB a few months back (I have no idea why it failed - only t20 used
since I bought it).
Now, off to find a cheap BG1 and/or F.AC_Adapter somewhere in Australia!!!
thanks,
davidt
Adelaide, South Australia
> Hm-m-m-m-m.... Doesn't sound quite right to me. Seems to me that both
> (in fact almost all) flashes' trigger caps charge to something in the
> vacinity of 100-125V, but it's been years since I bothered to check the
> actual potential across the X-contact and ground -- I'll have to drag a
> few flashes out and test next time I'm at the office....
>
> > is there a schematic of the qa310 circuit online anywhere?
>
> Can scan & email if it's not online somewhere. There were two basic
> variations of the circuitry of the 310, btw -- or should that be, "one
> original and one variation"? I'm sure someone here will let me know!
> ;^)
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|