Dead A3020 parallel port.

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Zarchos
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Dead A3020 parallel port.

Post by Zarchos » Sun Jun 11, 2017 1:53 am

Hi all.

I have an A3020 with a dead parallel port (I saw that when connecting a known to be working Iomega Zip drive).
Where should I start to try to repair it ?
The motherboard had seen a battery leakage but everything had been cleaned a few years ago.
What are all the small cms next to the parallel port connector ? Protection diodes ?
What series of tests should I try ?
I'd say check the voltage 1st and the ground , but what is your opinion ?

Thanks in advance for your help, it is the 1st time I encounter (I have encountered ?) this issue.
I would be happy to fix this issue this Sunday afternoon.

Xavier.

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danielj
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Re: Dead A3020 parallel port.

Post by danielj » Sun Jun 11, 2017 6:38 am

If you're happy the connector's clean and connected, start with the schematic, and check the continuity and values of resistors for each section of the parallel interface starting from the IO IC out to the connector.

d.

RobC
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Re: Dead A3020 parallel port.

Post by RobC » Sun Jun 11, 2017 7:03 am

I had this problem on an A3020 - corrosion had damaged a couple of tracks around the parallel port. I repaired the damage with kynar wire.

Zarchos
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Re: Dead A3020 parallel port.

Post by Zarchos » Sun Jun 11, 2017 7:36 am

Thanks for your fast answers.
I have started with continuity check and already found 2 tracks cut (one of them is the nearest to the battery).
Now preparing one litre of coffee to fight for little A3020 (working in the yard, and I can tell you today it is going to be very hot).

Xavier.

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flaxcottage
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Re: Dead A3020 parallel port.

Post by flaxcottage » Sun Jun 11, 2017 9:00 am

Zarchos wrote:...(working in the yard, and I can tell you today it is going to be very hot).

Xavier.
Lucky you! 8) If you did that here the solder flux would be washed off for free. :lol:
- John

Check out the Educational Software Archive at www.flaxcottage.com

Zarchos
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Re: Dead A3020 parallel port.

Post by Zarchos » Sun Jun 11, 2017 10:34 am

Fixed !
I 1st tried to reflow the joints underneath (spent a lot of time scrubbing the oxidized joints, pouring some flux, soldering repeating the entire process until I get some generous shining joints, it gave no continuity) and then used 2 small length wires from a mouse lead.

Thanks for your help, greatly appreciated.

Xavier Louis.

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