Table of Contents
Advertisement
5.13
COMPLIANCE CHECK AND ADJUSTMENT (SINGLE-SIDED DRIVES)
Compliance
is
the
maximized output of the head when the pressure of
the
felt
pad
is centered over the read/write gap.
For double-sided
drives,
a
compliance
check
and
adjustment
must
be
made at the
factory.
Compliance Check
1.
Set up the oscilloscope:
Channel A:
Test Point 4
Channel B:
Test Point 5
Vertical Amplitude:
100 millivolts per division
Ground:
Test Point 8 or 14
Read Differentially:
A and B, B inverted
Time Base:
10 microseconds per division
External Trigger:
Test Point 12, positive edge
2.
Apply power to the drive.
3.
Select the drive.
4.
Insert a nonwrite protected diskette.
5.
Write a IF pattern on Track 34.
6.
Observe the output waveform voltage.
7.
With a gram gauge, carefully apply fifteen grams pressure to
the upper arm.
NOTE
FIFTEEN GRAMS IS ABOUT THE WEIGHT OF A QUARTER.
8.
If the output shown on the oscilloscope increases by more
than ten percent, adjust the compliance.
5-20
Advertisement
Table of Contents
