11 Jan
2013
11 Jan
'13
8:09 a.m.
Youy may have noticed that I have been absent for a while. The reason is
that my home internet access is down, due to problems at the ISP end
(I think). I am reading this in an internet cafe...
Picked up a very dirty but nearly entirely functional
HP 9810A recently,
with 9865ACassette Memory drive. While I wait for parts to repair the
9810's mag card reader and printer to arrive, I've been working on
cleaning up the9865A.
Are you a member of HPCC? The reason I ask is that I wrote a series of
articles for the HPCC magazine on repairing this series of machines, and you
might find them interesting. I would offer to send them to you, but of course
there's no real way to transfer them at the moment.
It is almost working (and the few rubber parts in it seem to be good) --
I would strongly recomend replacing the 2 'tyres' on the drive wheels.
They're
size 119 O-rings IIRC, and are not hard to get.
however it will not move the tape forward. There are
two solenoids that
control the direction of the tape and one of them (for the forward
direction) is not activating. It shouldn't betoo difficult to trace down
the circuit and find the faulty part but before I dig too deep I thought
I'd see if anyone has a service manual for this thing. I've looked in
the usual places on the 'net and haven't found anything, aside from
Tony's notes for the interface.
I believe that some of the boards in the internal tape controller of the
HP9830 are the same (or at least very similar) to those in the
HP9865 -- at least they have 09865-xxxxx part numbers. The
official HP service manual covers the controller to component
level, and of course there are my schematics for the HP9830.
I think the board you want to be looking at (and I am doing
this from memory) is the 09865-66564. There's a little
logic and a couple of transistors to drive the solenoids.
I assume the solenoid isn't burnt out ...
-tony