Re: Adjusting HP 10 and HP 25C Message #4 Posted by `Ronald on 4 Sept 2004, 4:32 p.m., in response to message #3 by Ronald
Hi Tony,
I had some troubles to get the HP-10 printer running again, but a total cleaning and lubrication of the printer got this one up again.
Now I was stuck with all dots in the display the moment the printer was accessed and also that the characters were stretched out horizontally. Some carefull fiddling with the potmeters got that up again. By comparing the speed of the printhead mobing from left to right from to a HP-19 and adjusting potmeter 4 got that back on track. Potmeter 5 is the density of the printer. Potmeter 3 is the brihghtness of the display, potmeter 2 is for adjusting the low voltage warning (I set it to trigger at 4.8 volts for now).
Potmeter 1 is still not clear to me, it does something on the horizontal speed of the printhead, but potmeter 4 also has that effect.
I counted the potmeters from 1 to 5 looking from the top from left to right.
Another observation is that the battery has to be really oké. I was during the repair working with a stabilised PSU with a current limit of 500 ma. This made the printing giberish. When switching to a more powerfull power supply, one who can deliver up to 3A, the print out was clear dark and 100% oké.
So it looks like the HP-10 will have a second working live now. Your info on the potmeters were very usefull.
Thank you for that.
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