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SAM4S ER-290 5-1
5 Alignment and Adjustments
This chapter describes the methods for aligning and adjusting components in this ECR.
5-1 Position of the Timing Detector Assembly
Adjustment Step Description Point in Adjusting
1
2
3
z Manually rotate the second reduction gear until the
desired ratchet teeth of the printing wheel assembly
are aligned with the tip of the character selective
pawls.
z Apply the rated voltage to the timing detector
assembly, and then use an oscilloscope to observe
the output waveforms.
z Loosen the screws S-4 (M3x 8) the timing detector
assembly, then rotate the timing detector assembly
in the arrow direction. At this time, the output
waveforms should change to LOW Level.
z When the timing detector assembly is rotated in the
opposite direction, the output waveforms should
change to HOGJ level.
z Slowly rotate the timing detector assembly again in
the arrow direction. At this time, the output
waveforms change from JIGH to LOW level.
( Screw – tightening torque : 6 kg/cm )
z Use the oscilloscope to check the output voltage of
the Timing signals.
Reference : Zero level
a : Less than 2V
b : Less than
0.8 Vb < 0-8 Vz < 2V
16


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