IBM PCjr Hardware Maintenance And Service page 378

18. Place the positive (+) lead of the meter on the
yellow wiresolder connection on the printertiming
sensor (PTS) board.
19. Loosen the printer timing sensor board locking
screw.
20. Move the printer timing sensor board either way
until the voltage reading is an up level
(approximately 5 Vdc).
Locking Screw
Positive (+) Lead to
Yellow Wire Connection
21. Move the print head slightly to the left. The voltage
reading should drop to a down level (approximately
0 Vdc). Do not allow the print head to step to the
next detented position.
22. Move the print head slightly to the right. The
voltage reading should drop to a down level
(approximately 0 Vdc).
Note: It is very important that the amoimt of
pressure exerted on the print head be equal in
either direction when the meter reading drops to
the down level, without causing the print head to
jump to the next detented position.
4-1400-46 Graphics Printer