Fujitsu M255XK Customer Engineering Manual page 31

3.3.5 TP7 Track 00 Sensor
Figure 3-12 shows a typical Track 00 waveform. The Track 00 photo-transistor
detects when the head carriage is at Track 00. Like the Track 00 interface signal,
this signal is Low only when the head is at or near track 00.
Note:
Track 00 output signal becomes True (low level) while the basic excitation
phase for the stepping Motor is excited. Because of this, the timing of the
waveform variation is not constant.
Track 00 sensor
track
02--J
' - - - - - - (m
level)
~track
00
Figure 3-12 TP7 Track 00 Detect Waveforms
TS-021-0130B7 ••• 01
3-13