|Woodstock HP-22 calculators for repair|
Message #1 Posted by Xavier A. (Brazil) on 11 Feb 2011, 12:59 p.m.
I just acquired 2 Woodstock financial HP-22 calcs.
The oldest one, most probably because of an heavy corroded circuitry, did not work very well even after a 50/50 alcohol vinagre/water bath of a few hours and a good brushing job. Probably due to the PCB itself, corroded inside, it will be very difficult to make this one alive again, unless I open the PCB itself, which seems hazardous.
Before having washed the other one (a most recent model whom components are quite different, corroded as well, or so), I had tested the first one with this other and recent PCB.
In this case, everything is working on the older calc, unless the registers R0 to R9 (and associated functions like 'FV', 'SIGMA+', etc. that require the use of the registers 5 to 9, and that return '0.00'). Number entry "seems" correct since '123' is returned as '123.00', but there is no mean to recall (RCL) another number than '0.00'.
I shall post some pictures next week end.
Does anyone know which component failed? Is there a way to fix this?
Many thanks in advance!
Edited: 11 Feb 2011, 1:12 p.m.