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Adjusting R8 to Increase HP-97 Printer Intensity
02-16-2021, 01:51 PM
Post: #4
Adjusting R8 to Increase HP-97 Printer Intensity
Can anyone help me find R8 on the printer PCB of the HP-97 desktop calculator.

The service manual says that if I adjust this resistor, which I presume means if I
replace it with a lower resistance resistor, then it will increase print intensity and
make the print darker.

Also, if you should know the specific resistor I should install (its ohms rating) and
where I can buy such a resistor (part number, etc) this would be very much
appreciated.
[/b]
I restore the card readers and printer page advance on these calculators and resell
them, however I would like to also make the print quality as perfect as possible for
my customers.

I'm equipped to replace chips but I only do so by installing sockets and trial and error
process to determine which chips are good and which ones are faulty; I'm not an
electronics person but a chemical engineer with a passion for the hobby. I restore
HP calculators to help finance the cost of building my personal collection and because
it is a great retirement past time.
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Messages In This Thread
Potentiometers - Dave Frederickson - 02-17-2021, 06:11 PM
RE: HP97,91,92 Print Intensity - teenix - 02-15-2021, 10:41 PM
RE: HP97,91,92 Print Intensity - isanchez - 02-16-2021, 11:28 AM
Adjusting R8 to Increase HP-97 Printer Intensity - James Linder - 02-16-2021 01:51 PM



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