Date   

Re: HP 9845 repairs - smoke recharged!

 


Afbeelding

You mean this place ;)


-Rik




On Sat, May 5, 2018 at 10:08 PM +0200, "Jack Rubin" <j@...> wrote:

It's a "burden" I'm happy to live with - the Computerarium sits in the woods on a rural site with a quiet lake nearby. Once the collection is fully resident there, I plan to make it my primary residence as well. It will be the largest collection of almost-operational vintage computers in south-western Michigan. It will also be the only such collection in the area. :>)

Not quite the Datormusem of Dalby, but in the same vein.

Jack


Re: HP 9845 repairs - smoke recharged!

Jack Rubin
 

It's a "burden" I'm happy to live with - the Computerarium sits in the woods on a rural site with a quiet lake nearby. Once the collection is fully resident there, I plan to make it my primary residence as well. It will be the largest collection of almost-operational vintage computers in south-western Michigan. It will also be the only such collection in the area. :>)

Not quite the Datormusem of Dalby, but in the same vein.

Jack


Re: HP 9845 repairs

Jack Rubin
 

Dave,

Unfortunately, my situation is similar to yours - my machine was one of three that had been used for research and product development by an audio products manufacturer. I received an Option 100 machine 9845B, an Option 200 9845B (apparently a 9845T, though I'm still not sure how to verify that) - the machine that I now have running - and an 9845C.

Nothing quite matched up - the Option 100 machine had no power supply, the Option 200 machine had a "standard" (Option 100) power supply and the 9845C had the correct Option 200 supply. The only monitor I received was a 98780. I've ended up transplanting the 9845C power supply into the 9845T and re-capping the Option 100 PSU and putting it (back?) into the Option 100 machine.

Net result of all this swapping is that I also have a clean 9845C with no power supply or monitor, an Option 100 9845B with no monitor, and a complete, functional (for now) 9845T with correct power supply and monitor.

Sorry I can't be of more help.

Jack


Re: HP 9845 repairs - smoke recharged!

 

2 hours apart ??

You’re going to spend a lot of time travelling 😉

But Jack congrats, nice work.

 

-Rik

 

Van: VintHPcom@groups.io <VintHPcom@groups.io> Namens Jack Rubin
Verzonden: zaterdag 5 mei 2018 12:49
Aan: VintHPcom@groups.io
Onderwerp: Re: [VintHPcom] HP 9845 repairs - smoke recharged!

 

I'm looking forward to it!

I'm in the fortunate but frustrating situation of moving my collection to a new work space - my "stuff" is divided between two locations about two hours apart. The 9845 is "home" with me; my HPDrive and peripherals are at the (soon-to-be) Computerarium. I expect to be moving the 9845 on Monday and look forward to adding some mass storage to it then.

BTW, the new location is (somewhat) closer to Quebec, if you're ever headed out this way!

Jack


Re: HP 9845 repairs

 

Congratulations on getting this machine up and running!

I'm curious where you found your option 200 power supply.  I have an option 200 9845C which is missing the power supply.  It was a test system at a repair facility, and apparently the power supply got raided to repair a customer's system long after these machines were end-of-life.

I have been searching for the past few years for an option 200 power supply in any condition, and would be grateful for any leads.


Re: HP 9845 repairs - smoke recharged!

Jack Rubin
 

I'm looking forward to it!

I'm in the fortunate but frustrating situation of moving my collection to a new work space - my "stuff" is divided between two locations about two hours apart. The 9845 is "home" with me; my HPDrive and peripherals are at the (soon-to-be) Computerarium. I expect to be moving the 9845 on Monday and look forward to adding some mass storage to it then.

BTW, the new location is (somewhat) closer to Quebec, if you're ever headed out this way!

Jack


Re: HP 9845 repairs - smoke recharged!

David Collins
 

Congratulations Jack – another 9845 rises again.

 

David Collins

 

From: VintHPcom@groups.io <VintHPcom@groups.io> On Behalf Of Jack Rubin
Sent: Saturday, 5 May 2018 12:44 PM
To: VintHPcom@groups.io
Subject: Re: [VintHPcom] HP 9845 repairs - smoke recharged!

 

I was able to find a new line filter small enough to fit within the HP case. I used a Schaffner FN332 filter which fits snugly in place. I also obtained the proper power supply for my Option 2xx system and upgraded the Rifa cap. Photos are in the 

I assembled everything this afternoon and was finally able to power up the system - after a brief POST and memory test, I was rewarded with:



Now it's time to RTFM and figure out how to make it do tricks.

Jack


Re: HP 9845 repairs - smoke recharged!

Ansgar
 

For Francois' 9845 demo I guess you might need some advice. Check my 9845 emulator page (http://hp9845.net/9845/projects/emulator/#downloads) and get the supplemental files package, This one also includes demo.hpi with demos for the 9845 in the discs directory. Mount that image (e.g. with HPDrive) and load & run FLDEMO. VERY impressive what Francois has created for the 9845 with fast monochrome graphics (does not run on standard or color graphics) !

-Ansgar


Re: HP 9845 repairs - smoke recharged!

Paul Bicknell
 

Hi François

You talk about a demo do you have any demos that run on hp basic 4.1 also
looking for programs for the 70000 MMS equipment

Regards Paul b

-----Original Message-----
From: VintHPcom@groups.io [mailto:VintHPcom@groups.io] On Behalf Of François
Lanciault
Sent: 05 May 2018 06:31
To: VintHPcom@groups.io
Subject: Re: [VintHPcom] HP 9845 repairs - smoke recharged!


On May 4, 2018, at 22:43, Jack Rubin <j@ckrubin.us> wrote:


Now it's time to RTFM and figure out how to make it do tricks.
Congratulation Jack!

You can always start by loading and running the demo I wrote for the 98780
equipped 9845 computers. You might has seen it running on the fabulous 9845T
emulator but nothing beats looking at it on real hardware !

François
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Re: HP 9845 repairs - smoke recharged!

François Lanciault
 

On May 4, 2018, at 22:43, Jack Rubin <j@ckrubin.us> wrote:



Now it's time to RTFM and figure out how to make it do tricks.

Congratulation Jack!

You can always start by loading and running the demo I wrote for the 98780 equipped 9845 computers. You might has seen it running on the fabulous 9845T emulator but nothing beats looking at it on real hardware !

François


Re: HP 9845 repairs - smoke recharged!

Ansgar
 

Congratulations! Isn't it nice to see just 4 simple words?

-Ansgar


Re: HP 9845 repairs - smoke recharged!

Jack Rubin
 

I was able to find a new line filter small enough to fit within the HP case. I used a Schaffner FN332 filter which fits snugly in place. I also obtained the proper power supply for my Option 2xx system and upgraded the Rifa cap. Photos are in the 

I assembled everything this afternoon and was finally able to power up the system - after a brief POST and memory test, I was rewarded with:



Now it's time to RTFM and figure out how to make it do tricks.

Jack


Re: HP 9845 repairs

 

I remember once reading something in an electronics magazine when I was a kid that said something like “If a fuse blows, the first thing to do is to replace it and try powering it up; sometimes fuses blow because they’re tired” - I’ve used this in the past with non-disastrous results.

Brian

On May 3, 2018, at 6:38 PM, François Lanciault <francoislanciault@...> wrote:

Thank you Jack,

The more I think about it, it was a 1 Amp fuse that I use. As I said the computer has been running correctly ever since.

That brings the question, why did the original 3/4 A fuse blow to begin with... Will it blow again if I replace it with the right rating? I think I will try to measure the current at that location while the computer is running.

Where did you bought the Thompson caps? I looked at DigiKey.ca and Mouser.ca and they don't seems to carry that specific brand?

Best regards,
François

----------------------------
Professor Brian White
Provost Fellow for Education and Technology
ISC-4450
Biology Department
UMass Boston
100 Morrissey Blvd
Boston, MA 02125
(617) 287-6630
(617) 287-6650 (fax)
http://intro.bio.umb.edu/BW/
KB1QZA


Re: HP 9845 repairs

Ansgar
 

Gentlemen,

that capacitor is really a matter of taste. Use wharever you like. My personal favorite is the WIMA type (since it still is an epoxy type):



Which you can get at Mouser. But, as I said, use whatever you like best.

-Ansgar


Re: HP 9845 repairs

 

On 05/03/2018 12:38 PM, François Lanciault wrote:
Where did you bought the Thompson caps? I looked at DigiKey.ca and
Mouser.ca and they don't seems to carry that specific brand?
Hello Francois, I provided the capacitors to Jack. I have a very
large (many tens of thousands) of X/Y-rated capacitors here in various
values and form factors, and am gearing up to sell them online. I'm not
quite ready to do that, but here they sit.

This is a commercial effort, but as this is a small group of good
people, I don't mind sending a few out freebies here and there, before I
get the online store set up. Let me know if you get into a bad spot.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA


Re: HP 9845 repairs

François Lanciault
 

Thank you Jack,

The more I think about it, it was a 1 Amp fuse that I use. As I said the computer has been running correctly ever since.

That brings the question, why did the original 3/4 A fuse blow to begin with... Will it blow again if I replace it with the right rating? I think I will try to measure the current at that location while the computer is running.

Where did you bought the Thompson caps? I looked at DigiKey.ca and Mouser.ca and they don't seems to carry that specific brand?

Best regards,
François


Re: HP 9845 repairs

Jack Rubin
 

Francois,

The leads on the replacement Thompson cap are about 2 mm wider but it easily fit into the existing holes on the board. The fuse in my supply is rated at 3/4 A, 250 V. I have tested this supply (to the extent of verifying all voltage LEDs light) in an option 1xxx chassis but I didn't attempt to verify actual voltages. That will have to wait another few days while I'm awaiting components to repair the line filter.

Best,
Jack


Re: HP 9845 repairs

François Lanciault
 

Hi Jack,

Thank you for the new model 200 power supply pictures.

There is a fuse in picture 66517_Removed. Can you tell me its rating ? When I got my 9845T 15 years ago, it was completely dead. Not knowing what to do and having no schematic nor maintnance manual (hp9845.net did not exist at the time) I found a dead fuse (the one in the picture) and replaced it with the only fuse I had at hand. I am almost sure the replacement fuse I used was of a higher Amps rating than the original which is not a good idea. But as the computer was brought to life and is still running to this day, I never bother to put back the right fuse. Now that I am, like you, in the process of changing all Rifa capacitor I will finally change the fuse to what it should be. 

Speaking of the Rifa capacitor, can you tell me what is the exact pin spacing of the 0.68uF capacitor you replaced in the model 200 power supply ?

Thank you
François


Re: HP 9845 repairs

Jack Rubin
 

I've just posted a new album showing a 09845-69981 power supply teardown and Rifa cap replacement. Only one bad boy in this version of  the supply.

Jack


Re: New member

 

Great to have you here, and nice collection! Welcome (ou bienvenue?).
(Jean-)Marc

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