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3.3 ADJUSTMENTS
@ For the adjustment required in printer assembly, refer to Adjustment A and B in the following.
@ All adjustments are made when the printer is manufactured
at the factory. However, if parts are desassembled
or replaced for maintainance or repair, the partinent adjustments must be performed for normal operation of the
printer.
Position of the Timing Detector Ass'y
1
@ Manually rotate the second reduction gear
until the desired ratchet teeth of the print-
ing wheel ass'y are aligned with the tip of
the character selective pawls.
Character selective paw! Cf
a
Ratchet tooth
0.25-mm
overlap
Apply
the
rated
voltage
to the
timing
detector ass'y, then use an oscilloscope to
observe the output waveforms.
@ Loosen the setscrew
S-4 (M38)
of the
timing detector ass''y, then rotate the tim-
ing detector ass''y in the ® arrow direction.
At this time, the output waveforms should
change to LOW level.
@ When the timing detector ass'y is rotated
in the opposite direction, the output wave-
forms should change to HIGH level.
@ Slowly
rotate
the timing
detector
assy
again in the ® arrow direction, then tighten
its setscrew to mount it at the position just
before the output waveforms change from
HIGH to LOW
level.
(Screw-tightening torque: 3 kg/cm)
Use the oscilloscope to check the output
voltage of the Timing signals.
Reference:
Zero level
a: Less than 2 V
b: Less then
08Vb<08Va<2V
Alignment of timing
detector assy
Supply voltage
Zero tevel
~51-
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