Thanks for all the tips and links
Today it came in. It turns out to be a 9100B (but he has a A too) Inside it misses two indicator lamps but for the rest it looks complete and untouched. The only thing that worries me a lot is the CRT. It is transparant and the clamp that holds it is broken. Never seen a transparant CRT. You can see the getter, the Phosphor but I also see a white spot about 1" width and 1/2" high. It looks like it is under the getter but I do not hope this means the CRT is cracked...
Stange thing is all the motorola transistors are painted red on top. Why ?
Fred PA4TIM
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--- In hp_agilent_equipment@..., "Dave Brown" <tractorb@...> wrote:
Several years ago I dealt with some real experts in repair of this
calculator that are probably still accessible via the MOHPCalc site and
email lists.
Mine is yet again in need of repair following the earthquakes we had here a
year or two ago but I'm hopeful that it will go again despite the mechanical
damage to the case etc.
DaveB
Christchurch, NZ
PS- I have some rolls of the special paper used in the 9120A printer if your
friend has one of those. Not in perfect condition anymore but still useable.
----- Original Message -----
From: "fred" <fredschneider@...>
To: <hp_agilent_equipment@...>
Sent: Thursday, November 08, 2012 9:08 AM
Subject: [hp_agilent_equipment] Repair HP 9100A calculator
Tommorow a friend brings in a HP9100A for repair. It is in unknown working
condition founded under a floor but optical inside/out in good shape. (
and for me a sinclair multimeter and finaly I get a real HP35)
I have plenty experience in repair ( most meaurement and radio stuff, from
vector netork anlysers to digital multimeters, but I'm an analog guy)
But this is a sort of "computer" without the CPU, ICs ect. So very new
for me.
It has torroid memory, a sort of multilayer PCB ROM and according to the
owner about 300 transistors.
Do some people here have experience and tips/advise with this piece of
art. ( and HP history)
Fred pa4tim
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