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Good morning from Switzerland ;-)
Just received a HP-97 this morning and after some resoldering it seems to work.
One question though:
Is the noticeable display flickering normal?
Especially the flickering is heavier in the left hand digits.
Or something to do we have here 50Hz instead of 60Hz?
Posts: 3,283
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Do you have a good battery? The battery is required to regulate the supply voltage.
Posts: 24
Threads: 10
Joined: Aug 2013
Pretty dead battery pack ;-)
But thanks for pointing me in the right direction...
Added a small 100uF capacitor across the 5V power supply, close to the AC input where it says "+" and "-" on the PCB...now the flickering has gone and also the printer motor moves...though one gear is worn out...
Posts: 24
Threads: 10
Joined: Aug 2013
Well....voltage is a little too high now with the capacitor....
Gonna use a standard 5V USB power adapter now to be on the safe side ;-)
Posts: 3,283
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Joined: Jul 2005
Replacement battery packs are available online on a well known auction site.