Re: 41C repair Message #5 Posted by Andrés C. Rodríguez (Argentina) on 11 Feb 2001, 3:39 p.m., in response to message #4 by Steve (Australia)
I had to wire batt power ( + to a diode, - to ground) to the CPU board, tired of false contacts, broken posts, etc. It is fine IF YOU ARE SURE ABOUT WHAT YOU ARE DOING.
If memory helps, the positive battery side is series connected to a GERMANIUM diode (it is preferrable to lose 0.3 volts of battery voltage with germanium than losing 0.7 with silicon, another proof of HP good thinking at the time) as a reverse polarity protection. So, if you trace the connection from the battery positive to the keyboard printed circuit board, and then to the CPU board, you may connect to the same point I did.
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