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----- Original Message -----
From: fred
To: hp_agilent_equipment@...
Sent: Saturday, November 10, 2012 1:05 PM
Subject: [hp_agilent_equipment] Re: Repair HP 9100A calculator




I do not know what a PDA electrode is, but there is nothing besides the pins that go in the socket on the rear. ( it is the electrode that is in front of oscilloscope tubes !)
--- In hp_agilent_equipment@..., "Tom Miller" <tmiller11147@...> wrote:
>
> Does the tube have a PDA electrode on the front?
>
>
> ----- Original Message -----
> From: fred
> To: hp_agilent_equipment@...
> Sent: Saturday, November 10, 2012 11:09 AM
> Subject: [hp_agilent_equipment] Re: Repair HP 9100A calculator
>
>
>
> Bad news.
> The CRT is dead, it is broken in two in the socket. :-(
> so this is the end I'm afraid.
>
> Its a HP-5083-1551
> 28cm long
> 5"diagonal (or 4,7"I do not know how they measure
> -3500V cathode, 6,3VAC heather
> 14 pin, 12 used (2 heather, cathode, 4 grids, 2 vertical and 2 horizontal plates.
>
> Maybe I can trace the signals somewhere and use an XY monitor so I can try the rest. If all works I can try to find a replacement (I'm not afraid for altering circuits or building interface circuits.
>
> There was an external monitor but the 9100 had to be modified and the 3 connection points are not connected. I can not find anything about the mod.
>
> Fred
>
> --- In hp_agilent_equipment@..., "raymonddompfrank" <raymond@> wrote:
> >
> > Just realized that I should have added that sometimes even in good tubes the patch can be partly whitish instead of mirror-like. Sorry to cause confusion.
> > I sincerely hope that the tube is ok because I guess a replacement would be very difficult to find.
> > A glowing heater would be proof of the vacuum being intact (and at least some of the PSU).
> >
> > Raymond
> >
> >
> > --- In hp_agilent_equipment@..., "raymonddompfrank" <raymond@> wrote:
> > >
> > > I'm afraid that a milky-white patch on the glass where the getter is, usually means that the vacuum is gone. Normally, the spot is shiny metal coloured (and it is shiny metal...)
> > >
> > > Raymond
> > >
> > > --- In hp_agilent_equipment@..., "fred" <fredschneider@> wrote:
> > > >
> > > > 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
> > > >
> > > > --- 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
> > > > > >
> > > > > >
> > > > > >
> > > > > > ------------------------------------
> > > > > >
> > > > > > Yahoo! Groups Links
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > --
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