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| SE serial ports diagnostic and repair |
Posted by: clh333 on 2017-03-15 09:12:29
I acquired an SE about a month ago - first one I have owned - and recently posted here a question concerning printing from the SE. (I have a StyleWriter and couldn't make it work with the SE / OS 6.0. 😎 .
Since then I have been running tests on the machine and today ran Snooper 2.0, which diagnosed a problem with the serial port. The first pass tested the modem port, which failed at all speeds tested, but skipped the printer port as Apple Talk was on. I turned off Apple Talk and repeated the test: This time both ports failed.
I understand there is a Zilog Z8530 chip which controls both ports. I am assuming that is responsible for the problem. But before I dig out the board I would like to ask whether any other diagnostic test could be run to confirm the problem. Also, if anyone has a suggestion for how to approach the repair I would welcome their input. For example are any other related chips suspect?
Thanks for your replies.
-CH-
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Posted by: apm on 2017-03-19 13:14:02
I don't know anything about Snooper, but usually the serial tests need a loopback cable installed (i.e. routing the transmit signal back to the receive). If you don't have anything like that attached, then I would expect it to fail.
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Posted by: clh333 on 2017-03-22 10:09:26
Thanks for your reply.
I eventually attached a known-good modem and tested with that. Although the handshake test still failed the throughput tests passed. I understand from reading that the handshaking is hardware-based; I don't know why that would fail but the modem cable is molded-on and so I don't know what I could do to substitute.
I also found an old ImageWriter II and was able to print to that through the printer port. From these practical tests I concluded that the Z8530 was working acceptably.
Thanks again for your help!
-CH-
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