HP 200 Service Manual page 143

The lines on the paper serve two purposes: Some lines have already been optically read
by the plotter and used to perform cartridge alignment; others are now to be inspected
by you.
An example of the cartridge alignment plot sheet is shown below. The two pairs of
lines that you should inspect are indicated on this example.
6 If any of the left cartridge or right cartridge lines includes gaps, then the corresponding
print cartridge should be either cleaned or replaced as appropriate.
C3187 90000
Gap
}
Left cartridge
}
Right cartridge
Calibrations 7 5