NEC FD1165 - Write Protect Sensor Check or Adjustment; Head Load Check

5.5.3 Write Protect Sensor Check or Adjustment
After the wr i te protect sensor is replaced, perform the
following check.
a. Insert a flexible disk that has a write protect
notch into the disk drive.
b. Check that the voltage at TPII is less than 0.5 V.
Move the jacket of the flexible disk to make sure
that the voltage at TPII does not change.
c. If the voltage changes, loosen the screw that
fastens the sensor and change the posi tion of the
sensor until the vol tage does not change when the
flexible disk is moved.
d. Remove the flexible disk and insert a disk without
a write protect notch.
e. Check tha t the vol tage at TPII is more than 3.3 V.
Move the jacket and make sure that the voltage does
not change.
f. If the vol tage changes, change the posi tion of the
sensor until tbe vol tage does not change when the
jacket is moved.
5.5.4 Head Load Check
Perform this check after replacemen t procedures are per-
formed.
a. Write data of alIOs to an assigned track (using the
drive tester).
b. Load the heads and look at the read waveform.
c. If the unstable area of the waveform is not within
the specifications shown in Figure 5-8, replace the
carriage assembly.