The Museum of HP Calculators
HP Forum Archive 13
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Message #1 Posted by Howard on 10 Sept 2003, 1:15 p.m.
Hello All. I'm hoping somebody can help me with my HP-97 printer.
The problem is that the top row of pixels does not print. It appears to be an alignment problem but I cannot see any adjustment.
Can the problem be fixed?
Thank you in advance.
|Re: HP-97 Printer|
Message #2 Posted by David Smith on 10 Sept 2003, 5:39 p.m.,
in response to message #1 by Howard
There are three likely causes (in order of probability):
1) A burned out dot in the printhead. Bad news. Only replacement is from another HP91/92/97. If you check the resistance of the print head signals, you should see around 10 ohms to ground for each one. An open circuit is not good.
2) A bad driver transistor. Good news is the transistor array chip is a standard off-the-shelf part.
3) A bad cable trace or connector connection. Cable trace may or may not be fixable depending upon where it is bad.
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