Vintage Computing - messages #136752

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Heath/ZDS Users' Group

H-89 Terminal Logic Board Cleaning

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#1 of 2 Posted Oct-30 4:29 PM

From reavis86vic Posts 9 Last Nov-12
To Doc Bogner [Msg # 136752.1 ]

Doc,

One other question - I cleaned the computer for fretting, as I explained earlier. It is working well. Does the Terminal Logic board also need to be cleaned to insure optimal performance in the future?

Reavis

#2 of 2 Posted Oct-30 5:43 PM

From Doc Bogner Posts 674 Last Nov-9
To reavis86vic [Msg # 136752.2 136752.1 ]

Hi Reavis,

Short answer = yes.

As you now know from our presentation in the FRETCOR.TXT file, fretting corrosion occurs when dissimilar metals remain in contact with each other over time. All of the H-89 IC sockets and many of the connectors were tin alloy. Especially in the case of socketed ICs (including those used on the H-89 Terminal Logic Board), fretting eventually occurs and produces a whole host of unpredictable problems.

For all H-89 boards that have socketed ICs, cleaning plus use of an oxidation preventive chemical is one of the very best procedures you can perform to extend the life of your H-89. The remarkable results offset the fact that it's definitely a tedious and boring job.

Doc

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Heath/ZDS Users' Group

H-89 Terminal Logic Board Cleaning

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