Protrack I Model 20 with scanner Error 254

Re: Protrack I Model 20 with scanner Error 254
« Reply #45 on: June 24, 2020, 04:52:39 pm »
I got my hands on a old laptop with a parallel port , connected it up and ran 50 cycles of tests and the only failure are the relays. The error 254 went away, it looks like my port may defective or not compatible.

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Re: Protrack I Model 20 with scanner Error 254
« Reply #46 on: June 25, 2020, 08:19:23 am »
At least you know your ProTrack is okay. What were the BIOS parallel port settings on the old laptop? Maybe this would provide some insight on getting it working with a newer PC.
The most important troubleshooting tool is your eyes.

Re: Protrack I Model 20 with scanner Error 254
« Reply #47 on: June 28, 2020, 05:38:06 pm »
Selected ECP

jvthorsley

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Re: Protrack I Model 20 with scanner Error 254
« Reply #48 on: July 28, 2020, 11:27:41 am »
Have you replaced the faulty Relays?
You could then run "Loop Calc".
« Last Edit: July 28, 2020, 11:31:41 am by jvthorsley »

Re: Protrack I Model 20 with scanner Error 254
« Reply #49 on: August 01, 2020, 10:49:14 am »
I have received the replacement relays , just have to make time and replace them. also the failure indication two relay in each group can there be a way to separate the actual one that is bad ?

jvthorsley

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Re: Protrack I Model 20 with scanner Error 254
« Reply #50 on: August 01, 2020, 12:14:37 pm »
I have to say that as relays are going to be the weak link on the Scanner,  I always replace the pair in the group.
And as said previously here because the track is so thin to these relays, I always cut the legs close as possible to the relay case, and then use a fine tipped soldering iron placed one side of the leg on the relay side of the PCB, and fine solder on the other side of the leg, and out they come. Except for the one that might have the leg bent at right angles on the solder side of the PCB. Then clear the hole with fine copper braid. Solder suckers can destroy the fine track. Apologies if you are already conversant with the technicalities of component extraction.
Apparently Huntron still use relays in the 3200S. I suppose MOSFETS don't have the switching speed, plus cost!
« Last Edit: August 01, 2020, 02:12:10 pm by jvthorsley »

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Re: Protrack I Model 20 with scanner Error 254
« Reply #51 on: August 02, 2020, 10:41:05 pm »
MOSFETs would affect the signatures. That is why we have always gone with a mechanical relay.
The most important troubleshooting tool is your eyes.