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TI-58 fault - repairable?
08-24-2023, 03:00 AM
Post: #6
RE: TI-58 fault - repairable?
My first suspicion would be a shorted capacitor, followed by a bad IC.  I think it's pretty unlikely that a diode or transistor would go bad without being abused.

(08-23-2023 10:25 PM)teenix Wrote:  A bit off topic, but I always wondered why, on circuit boards of this era, the protective coating always has a bubbled effect on the traces.

It was common to put the solder plating on the copper before applying the soldermask; so when things were soldered, solder would run down under the trace.  Today it's normal to do soldermask over bare copper (SMOBC), before solder-plating the pads.

http://WilsonMinesCo.com (Lots of HP-41 links at the bottom of the links page, http://wilsonminesco.com/links.html )
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Messages In This Thread
TI-58 fault - repairable? - Pennine_Lad - 08-23-2023, 06:00 PM
RE: TI-58 fault - repairable? - Jeff_Birt - 08-23-2023, 08:02 PM
RE: TI-58 fault - repairable? - Jeff_Birt - 08-23-2023, 09:06 PM
RE: TI-58 fault - repairable? - teenix - 08-23-2023, 10:25 PM
RE: TI-58 fault - repairable? - Garth Wilson - 08-24-2023 03:00 AM
RE: TI-58 fault - repairable? - Jeff_Birt - 08-24-2023, 07:30 PM
RE: TI-58 fault - repairable? - teenix - 08-24-2023, 10:20 PM



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