00 Track Sensor Check Or Adjustment; Track 00 Signal - NEC FD1165 Maintenance Manual

b. When using a dual-sided flexible disk, measure the
waveform at TP7 checking for a pulse width of 1 to
3 ms (see Figure 5-6).
c. If the waveform does not meet this specification,
adjust the index sensor as in Section 4.4.7.
- - , r - - -
166.7 ms±2% \
I
- .1. _ _ --./
\
\- .1
Figure 5-6 Waveforms at TP7 and 'TPlO
5.5e2 00 Track Sensor Check or Adjustment
If the 00 track sensor in the carriage assembly is replaced,
carry out the following procedure.
a. Repeatedly perform a seek between track 0 and track
7 at a step time of 3 ms to 5 ms.
b. Check that the Track 00 signal occurs within 2.0 ms
to 2.5 rns of the Step signal to track 00 (see Figure
5-7).
c. If the timing exceeds the specified value, loosen
the installation sC,rew of the 00 track sensor and
move it inwards until the' signal meets the specifi-
cation (2.0 to 2.5 ms). Make sure that you do not
move the sensor too much or it may identify track 2
as track 00.
iTRACKOO
u--b-
TRACK7J
STEP
~r--u
-.J-------'.~
\ - - - - - - - - - - t - - - - - . r . . . . - " " - - -
DIRECTION
TRACK 00
I~
2.0 ms TO 2.5 ms
Figure 5-7 Track 00 Signal
5-9