13 Aug
2011
13 Aug
'11
1:58 a.m.
I give up. The 11'th attempt at repairing that gummy drive wheel resulted in yet
another unround wheel that is unable to smoothly transfer cards.
I just cannot seem to find the exact size of tubing, anything constructed with heatshrink
just is not round.
The clutch operation seems to be OK.
Anyone wants to sell me a few inches of KNOWN WORKING ( i.e. correct size ) tubing ?
Jos
13 Aug
13 Aug
12:32 p.m.
HP have made many, many card readers over the years, for both punched
cards and magnetic cards. Could you tell us what uou ware working on :-)
I give up. The 11'th attempt at repairing that gummy drive wheel resulted in yet
another unround wheel that is unable to smoothly transfer cards.
I just cannot seem to find the exact size of tubing, anything constructed with heatshrink
just is not round.
The clutch operation seems to be OK.
Anyone wants to sell me a few inches of KNOWN WORKING ( i.e. correct size ) tubing ?
If this isa calculator magnetic card reader of the HP65/97/97/41 type, I
find a couple of size 005 O-rings work fine.
If it's an HP9100/9810/9820 magnetic card reader, I use a larger-zize
O-ring, but I also machine a new metal hub to hold it.
-tony
14 Aug
14 Aug
12:58 a.m.
On 08/13/2011 09:32 PM, Tony Duell wrote:
HP have made many, many card readers over the years,
for both punched
cards and magnetic cards. Could you tell us what uou ware working on :-)
Of course,....
It is an HP97S calculator.
Should have realized that my email was somewhat short on info...
Had some replies from people thinking I was working on punched-card readers.
Jos
3:51 a.m.
Jos,
I've the o-rings stocked so if you want some let me know, keep in mind that
the clutch between the motor axle and worm-wheel must also be in good shape.
A quick but not preferable fix is gluing the clutch together, otherwise you
can use wire insulation of the right size to fix the clutch.
It's also important to check the caps on the card reader board for high ESR,
I always replace the tantalium caps on those boards.
At the HP Calc museum DVD there is a service manual for the HP 97(S) if you
don't have it you can get a copy from me.
-Rik
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Jos Dreesen
Verzonden: zondag 14 augustus 2011 9:58
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: That darned HP card reader...
On 08/13/2011 09:32 PM, Tony Duell wrote:
readers.
HP have made many, many card readers over the
years, for both punched
cards and magnetic cards. Could you tell us what uou ware working on
:-)
Of course,....
It is an HP97S calculator.
Should have realized that my email was somewhat short on info...
Had some replies from people thinking I was working on punched-card
Jos
11:23 a.m.
Jos,
I've the o-rings stocked so if you want some let me know, keep in mind that
the clutch between the motor axle and worm-wheel must also be in good shape.
A quick but not preferable fix is gluing the clutch together, otherwise you
can use wire insulation of the right size to fix the clutch.
It's also important to check the caps on the card reader board for high ESR,
I always replace the tantalium caps on those boards.
There's a capacitor in parallel with the motor in most of these magnetic
card readers, it's important to check that one.
Also, clean the cotnacts on the card detction leaf switch (the ends of
the spring leaf and the pads on th PCB, and in the case of a 9 7or 97S,
set it up as per the service manual instructions. I've had those
malfucntion in intersting ways...
-tony
4879
days inactive
4880
days old
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