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HP Forums › HP Museum Forums › Old HP Forum Archives v
HP42S battery failure

Linear Mode
HP42S battery failure


▼
Colin McKenzie Offline
Unregistered
Posts: 1
Threads: 1
Joined: Nov 2009
#2
11-26-2009, 04:47 PM

For some time my 42S refused to operate more than a few seconds and checking with a ohmeter showed the battery terminals resistance around 38 ohms. I used the forum to find out how to open it (had to drill out the plastic pillars)and soon found the pcb mounted electro was the culprit. I think the value is around 100uF. replaced with two 68uF in parallel and it has now come to life.Also explains why the battery change over caused loss of memory.

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