|Re: HP-34C Intermittent Display|
Message #2 Posted by Vieira, L. C. (Brazil) on 4 June 2007, 7:09 a.m.,
in response to message #1 by Robert Hollyer
I'd strongly suggest NOT to solder the display. I'd rather go for a cleaning procedure. I have two HP38 with solderless assembly, and they work pretty fine.
I used liquid metal polisher and let the PCB and the display contacts shinning (must be careful using it without 'contaminating' unnecessary areas). After that, I allowed a thin coat of micro-oil to remain in their surface, so it would reduce oxidation occurrences. It does not interfere in the normal operation because the pressure of the assembling components is enough making sure the necessary electrical contact to happen.
In any way, I'd avoid, by all means, to solder it. The flex PCB would not resist higher temperatures, and even if you have the necessary equipment, you should align it correctly to fit in the molded chassis. And, as a final remark... if it would work better as soldered assembly, chances are it would come this way, though.
Time's up... running back to normal life, though. Cannot check for spelling, sorry.
Edited: 4 June 2007, 7:20 a.m.