6 Nov
2005
6 Nov
'05
1:17 p.m.
Hello folks,
somebody has uploaded some useful information about these drives to
bitsavers - thank you!
There is only a kind of technical overview manual for my drive at the
moment.
But I still and urgently need the schematics for the 7978 drive. My
power supply has broken down and I cannot get it back working. I also
don't know how to repolace it because I don't know where to connect
+/-12V and power good etc....
Thank you very much!
Philipp :-)
P.S.: Shouldn't my Honeywell software be hosted on bitsavers, too?
6 Nov
6 Nov
3:10 p.m.
I asusme there's nothing of use on http://www.hpmuseum.net/ ? That has
some stuff on larger (than handheld) HP computers and peripherals.
But I still and urgently need the schematics for the
7978 drive. My
I sould be suprised if any published manual contained full schematics.
By that period, HP comptuers were 'repaired' by board-swapping. If you're
lucky there will be _some_ useful info in the boardswapper guide, like
pinouts or testpoints.
I hate to say this, but you may be reduced to producing your own
schematics. It can't be that difficult, I've managed to do it a few times.
-tony
5:29 p.m.
Hi,
For the 7970 tape drive there ARE the
full schematics on bitsavers... So
I think it should be possible to get the complete 7978B docs, too.
I asusme there's nothing of use on
http://www.hpmuseum.net/ ?
Don't think so.... :-(
But I still and
urgently need the schematics for the 7978 drive. My
I sould be suprised if any
published manual contained full schematics. By that period, HP comptuers were 'repaired'
by board-swapping. If you're
lucky there will be _some_ useful info in the boardswapper guide, like
pinouts or testpoints.
You are too pessimistic :-) I hope to find good
documentation of
everything I need.
I hate to say this, but you may be reduced to producing your own
schematics. It can't be that difficult, I've managed to do it a few times.
But there is one small problem: I don't have the time to do that for an
old switching power supply. And by the way I'm not very good in
repairing switching power supplies. These devices scare me a bit.....
+ph
7 Nov
7 Nov
4:12 p.m.
Hi,
For the 7970 tape drive there
ARE the full schematics on bitsavers... So
That's interesting... I will take a look.
I asusme there's nothing of use on
http://www.hpmuseum.net/ ?
Don't think so.... :-(
But I
still and urgently need the schematics for the 7978 drive. My
I sould be suprised
if any published manual contained full schematics. I think it should be possible to get the complete
7978B docs, too.
Hmmm... I've found some HP manuals contain schematics, some for
closely-related devices do not. And before you ask, I don't have any
'large' HP tape drives, so schematics will not be appearing on the HPCC
CD-ROM.
By that period, HP comptuers were
'repaired' by board-swapping. If you're
lucky there will be _some_ useful info in the boardswapper guide, like
pinouts or testpoints.
You are too pessimistic :-) I hope to find good
documentation of
everything I need.
I hate to say this, but you may be reduced to producing your own
schematics. It can't be that difficult, I've managed to do it a few times.
But there is one small problem: I don't have the time to do that for an
old switching power supply. And by the way I'm not very good in repairing switching power supplies. These devices
scare me a bit.....
Well, they're not too bad when they're turned off. I would check the
mains smoothing capacitors (likely to be a couple of 200V units at a few
hundred uF's each) with a voltmeter to make sure they're discharged
before diving in.
-tony
6985
days inactive
6987
days old
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