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HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
04-13-2019, 09:01 PM (This post was last modified: 04-14-2019 03:51 PM by albertofenini.)
Post: #1
HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
Hi everyone,

We have been able to use, somehow, our tape reader.
We have three tapes, two of which (seen in the picture) have some mechanical problems

The first when loaded and accessed by
the XEQ DIR command gives the following error message DRIVE ERR but sometimes works
and produces a listing (not the one attached)

The second when loaded and accessed by
the XEQ DIR command gives always the following error messages DRIVE ERR or TRANSMIT ERR

Do you think this could be due to the small white cushion not correctly positioned ?

The third one which is labelled HP41 DEMO works and produces the listing attached.

How can we try to load one of the subroutines and see if it works ?
Does any of these demo programs are familiar for someone of you ?

thank you very much !!

   
   

Edoardo & Alberto
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04-13-2019, 09:49 PM
Post: #2
RE: HP-41 82161A HP-IL Tape Reader
Just these days I discovered Tony Duell's data cassette repair guide ....
https://www.hpmuseum.org/guest/duell/rep82176.pdf
HTH
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04-13-2019, 10:53 PM
Post: #3
RE: HP-41 82161A HP-IL Tape Reader
(04-13-2019 09:01 PM)albertofenini Wrote:  The second when loaded and accessed by
the XEQ DIR command gives always the following error messages DRIVE ERR or TRANSMIT ERR

Do you think this could be due to the small white cushion not correctly positioned ?

Yes. The pads on both tapes in the attached pic are defective.

Note that is is only necessary to fix one pressure pad. Since the goal is to recover the data from the tapes, once the data has been recovered the tape essentially serves no purpose and the one repaired spring/pressure pad can be used on subsequent tapes.

Since virtually all tapes are unreliable due to age, the tape drive only serves the purpose of recovering data from old tapes. Once the data has been copied to a LIF disc image the PIL-Box is the preferred method for accessing the data.

Dave
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04-14-2019, 04:07 PM
Post: #4
RE: HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
Thanks everyone for the help, but we have a bigger problem ... which is why we changed the title of the post

We wanted t try to read a program from the demo tape and we discovered that the Tape Reader
does not turn on anymore.

Doesn't with only the battery, doesn't with the battery and the charger,
but without battery and with the charger when we move the switch to the ON position just the BATT led turns on
but nothing more (hope we didn't fried anything by doing this)

Obviously we have tested the charger, the battery, tried different ones and the problem is not there

So we opened the unit and we found the switch traces very dirty (see pic)
We cleaned them as they were kind on joint together, so we separated with the tip of the exacto as these should be.

However, when we connected the unit together, nothing, it still does not work.

We don't have the schematics for this unit, I have checked on the Schematics site,
but I have only found those for the HP-IL Printer, I'm wondering if the PSU is similar.

Also, we have found on the bench a strange small button (pictured with a rubber so that you can see proportions), that we don't think is coming from the unit, but you never know.

Has anyone have experienced a problem like this and tried to repair the Tape reader ?
Thanks for help !!!!

P.S. we have noted that the upper left corner and the bottom left corner of the switch traces are
like connected, with a very low resistance (6 ohm) which may be correct since
there is actually a big resistor of 5.6 ohm the connects that two but we don't know if it is ok

   
   
   
   
   

Edoardo & Alberto
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04-14-2019, 04:22 PM
Post: #5
RE: HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
Here's the Service Manual.

http://www.hpmuseum.net/document.php?hwfile=2835
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04-14-2019, 04:40 PM
Post: #6
RE: HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
Thank you very much !!
I think this may be beyond our capabilities
Has anyone ever repaired a unit like this and while we go thru the manual
can gives a few hints on where to check ?
What I do you think of the power switch traces ?
Are now ok ??
Thanks a lot

Edoardo & Alberto
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04-14-2019, 04:54 PM
Post: #7
RE: HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
(04-14-2019 04:40 PM)albertofenini Wrote:  What I do you think of the power switch traces ?

The traces look okay. Don't forget to lubricate the switch with a dielectric grease, or even better, Lubriplate DS-ES.

Dave
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04-14-2019, 04:57 PM (This post was last modified: 04-14-2019 05:02 PM by albertofenini.)
Post: #8
RE: HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
Do you think it is normal that upper left and lowest left are almost connected ?
We looked at the manual but it is difficult to understand the position of the components
Is there any testing point like in some of the calculators we have repaired in the past ?

Since it was working as of lunch time today and it doesn’t turn even on I think it has to be something macroscopic related to power supply that’s why I’m interested in understanding where the voltages should be available and how much the values should be

Edoardo & Alberto
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04-14-2019, 05:17 PM
Post: #9
RE: HP-41 82161A HP-IL Tape Reader - Doesn't work anymore - Help Needed
(04-14-2019 04:57 PM)albertofenini Wrote:  Do you think it is normal that upper left and lowest left are almost connected ?
We looked at the manual but it is difficult to understand the position of the components
Is there any testing point like in some of the calculators we have repaired in the past ?

Since it was working as of lunch time today and it doesn’t turn even on I think it has to be something macroscopic related to power supply that’s why I’m interested in understanding where the voltages should be available and how much the values should be

I'm not sure which contacts you're referring to. The schematic does show a 5.6 ohm resistor connected between two of the contacts (R1).

I suggest you start with the troubleshooting procedure in Table 4-4, Improper Turn-On.

Dave
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