HP 97 print issue

[zixingcheche]

Hi

I have a question about the HP 97 printer.
please check the picture.

ONLY the Upper half characters could be printed, the lower half keeping blank.

would you please give me some advice on this? thanks!

BR.
BAI

[teenix]

The problem could be...

Faulty print heads, they should read about 10 ohms.
Faulty ribbon cable to print head or connectors, or just that the cable is not located properly.
Faulty pin connectors from main CPU board to printer board, 12, 13 and 14
Faulty driver chip, marked as U2 on the printer circuit board
Faulty PIK chip

cheers

Tony

[zixingcheche]

Thanks Tony!

I checked the connector and ribbon cable.
it seems to be well connected.
in addition, the pin connectors are well contact between CPU & printer broad.

and for the rest, I have no tools for checking the chips.
I would like to keep this situation as it was.

anyway, thanks for your advisees!

BR,
bai

[John Garza (3665)]

And of course, DIRTY print heads.
Disassemble and alcohol swab. Or try some slightly abrasive paper (like card stock)

[zixingcheche]

(05-28-2023 03:48 PM)John Garza (3665) Wrote:  And of course, DIRTY print heads.
Disassemble and alcohol swab. Or try some slightly abrasive paper (like card stock)

Hi,
thanks for your advice, I will try it to see.