Service manual

38 TTPM3 - Service Manual March 2009
5.5 Printers with front load
SW99011
FRONT
Eccentric
cam wheel
Lock screwActuator arm
0.5 mm
FRONT
0.5 mm
Adjustment plate
1. Check with a feeler gauge that the distance between the actuator arm and the micro
switch housing (the frame around the knob) is 0.5mm. Turn the cam wheel to make
sure that it is the minimum distance that you measure. Adjust the switches if
necessary.
2. Loosen the lock screw.
3. Power up the printer and make sure that the printhead is lowered to the platen.
4. Let the adjustment plate fall forwards, and tighten the screw
5. Lift the print head up. Pull the lever forward and check that the head falls down by
gravity. If not, adjust the printhead pressure plate so that the lash between the
chassis and the pressure plate is 0.5 mm sideways and check again.
6. Apply grease on the edges of the hole in the actuator arm where the cam wheel runs.
7. Loosen the front load connector from the control board.
8. Connect a variable DC power supply to the connector; Plus to the red lead, and
minus to the blue lead. Increase the voltage to 4 Vdc. The motor should lift and lower
the head at this voltage.
9. Reconnect the connector to the control board.