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- Path: sundog.tiac.net!usenet
- From: Darius Taghavy <dart@ycrdi.com>
- Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga.audio,comp.sys.amiga.emulations
- Subject: How to Fix a blown serial port
- Date: 26 Jan 1996 19:48:22 GMT
- Organization: Young Chang R&D Institute
- Message-ID: <4ebb66$pb7@sundog.tiac.net>
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-
- >>Does anyone know how to diagnose whether a problem with the A3k serial port
- >>is related to the Paula chip? Where else do Paula probs show up? Problems
- >
- >It could also be that the MC1488 and/or MC1489 are not working ok. These are
- >RS232 drivers (5V <-> 12V levels). They are very cheap !
- >Unfortunately they are directly soldered to the board so you have to cut them
- >out to replace them.
- >
- This is good advice! However, if the prospect of cutting/unsoldering chips
- seems daunting, you can also piggyback solder the new IC - this worked for me!
- A give-away symptom for one of these ICs being blown is if only send *OR* receive
- is not working, but the other direction is still operational. The schematics will
- show you which IC corresponds to send and receive, respectively.
- Darius
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