Problem:
Symptom #1: During printing the Dot Matrix Printer or Imagewriter may halt
printing for no apparent reason and the select light will go out. Restarting
the printer or pressing the select button seems to correct the problem
temporarily.
Symptom #2: During power up the carriage assembly moves to the far left
position as in the normal power on sequence, but the carriage assembly then
fails to make its characteristic 3/4" movement to the right and then back to
the left position. In addition, the 'select' light fails to appear. Powering
off and on the printer repeatedly fails to produce the results above unless the
carriage assembly is moved to somewhere other than the far left position.
Instead, the platen will advance and retract approximately 1/4", and the
carriage assembly will move approx. 1/16" and halt.
Cure:
Replace the right margin disable switch which is available for the
Imagewriter as part # 970-0715 (Power Switch/Control Panel Cable Assembly).
For the DMP the switch itself needs to be removed and a replacement keyswitch
(705-0079) needs to be used since the complete assembly is no longer available
for the DMP.