26 Apr
2012
26 Apr
'12
2:07 p.m.
I have an
HP9836CU (series 9000/200) without monitor cable.
I know it well.... That is correct. One of the pins on the DA15 connecotr
on the
comptuer is
a 12V power ouptu. On the 9836A, it powers the monochtrome
monitor. On
the 9836C, it operate s a relay (actually a pair of relaus, for soem
unknown reaosn) on the monitor PSU board, whcih conenct maisn
to the rest
fo the SMPSU.
This is the mistake :) I was surprise to not hear the classic "sound" of
the high voltage on the crt tube, or the degauss coil "bump".
It is pin-pin, I can't remembr if all pins are
used (but read
on...). I
am pretty sure it was special cable, the 3 video signals were
wires with
(75 ohm?) coax, the other signals with just palin wires, Oh, and an
I've built the cable, referring to the pinout in the manual. Some signal
have a separate ground return; for them I've used twisted wires (I was
at home , not in laboratory and haven't coax cables).
It work :) and the characters on the screen are very goog, withoud noise
or other defect. The cable is without shield, but the lenght is very
short. In the future, I can build a serious cable :)
There should be a set of my schematics o nthe same
site. They
may well be
under the HP9826, the 2 machines are closely related so I
preodcued one
set of diagrams to cover the lot. Said diagrams cover the 9826, 9836A
(mono) and 9836C (colour) machines and monitors, and all the
CPU boards
I've seen, including the 68010 + MMU board in mu 9836CU.
I've found it and downloaded. It's a very big work !
Let me know if you need any help.
Thanks a lot !
Alberto.
------------------------------------------------------
Alberto Rubinelli - Fondazione MUSEO DEL COMPUTER Onlus
Via Costantino Perazzi 22 Tel 0321 1856032
28100 NOVARA (NO) - ITALY Fax 0321 2046034
Mobile +39 335 6026632
Sito web : http://www.museodelcomputer.org
Mail : alberto at museodelcomputer.org
Filiale di Torino : Tel 011 23415829
Filiale di Roma : Tel 06 98357066
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