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REPLACING THE PRINT HEAD
This is not a job which you will need to do very often. The print head has been
designed to give a life of about 200 million dots. In normal everyday use, this
will mean years of life. However, if the print quality is faint, even after you
have changed the ribbon, the print head will need replacement.
Only use a replacement print head as recommended by your supplier.
NOTE
This is a fairly tricky operation. Read the instructions below carefully before
attempting it. If you are in any doubt as to your competence to perform it, call in
the experts before you start.
1 Turn OFF the printer, and remove the power cable.
2 If the printer has been in operation immediately before this operation, the
print head will be hot.
NOTE
Allow time for the print head to cool before attempting to work on it,
I
3 Open the top cover.
4 Remove the ribbon cartridge (as described above)
5 Using a Phillips-type screwdriver, carefully unscrew the two bolts
securing the print head to the print head assembly (see the illustration
below).
6 Full the print head firmly upwards, releasing the print head card edge con-
nectors from the connector mounted on the chassis.
7 Remove the retaining screws and washers from the print head assembly.
Put them on one side.
8 Take the new print head, and locate it in position, making sure that the
card edge connections fit securely into the chassis connector.
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