22 Apr
2009
22 Apr
'09
8:12 p.m.
Tony Duell wrote:
You are free to wonder.
I don;t know where you found that manual, but it is certainly available
I was repairing an HP 9815 (desktop programmable
calc) a month ago. While
tracing it out to make the schematic, I noticed that a 680 uF, 25V electrolytic
I am wondering why you traced out the schematic of a 9815, when you can download both the official service manual
(boardswapper guide) and
unofficial full schematics (covering both main versions of the CPU board)
from http://www.hpmuseum.net/
The service manual I found previously, and contains the schematic only for
the power supply (which I had already RE'd by the time I found the manual). from hpmusuem.net, along with the schematics of the
9815 (and many other
machines).
IIRC, during a web search I saw something about a
schematic or full service
manual available on a CD.
Ah yes,, the HPCC schematics CD. That contains the same schematics as on
hpmuseum.net along with a few others and ones for most of the LED HP
handhelds. FWIW, foe all I spent _many_ hours producing those, I don't
get a penny (cent, whatever) from the sale of the CD-ROM.
Anyway, it (my RE'd schematic) is all done.
Well, if people would rather produce their own, I'll stop doing them
unless I also need them....
Alas I
didn't keep the one I replaced in the HP120, so I can't check that.
I suspect it is as Dwight was suggesting, the cap probably isn't doing much of
anything and the lack of C just doesn't matter in the scenario.