Adjusting R8 to Increase HP-97 Printer Intensity
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02-16-2021, 01:51 PM
Post: #4
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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. [b] |
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