MPI 40 Series - Measurement Procedures

4.7 MEASUREMENT PROCEDURES
The following list of measurement procedures should be made periodi-
cally to ensure data quality or if malfunctions are suspected:
A. Compliance Measurement
B. Erase Measureme~t
c. High Frequency Playback Measurement
4.7.1 Compliance Measurement
To. measure compliance perform the following steps in the order
listed:
A. Apply power to the disk drive and select drive.
B. Step head(s) to track 76.
C. Write a lF (hex) pattern (250 KHz) on the entire track.
D. Connect oscilloscope probes to TP4 and TP5 as in the radial-
track alignment procedure (paragraph 4.6.1).
E.
Apply a 15 gram load to
load pad (or upper head).
oscilloscope increases by
compliance. Turn the set
pressure.
the upper arm directly above the
If the amplitude observed on the
more than 10% the drive has poor
screw clockwise to increase the
I CAUTION I
Too much pressure will cause damage to
the read/write head( s) and diskette.
4.7.2 Erase Measurement
To measure the effectiveness of the erase, perform the following
steps in the order listed.
A. Apply power to the disk drive and select drive.
B. Step the head(s) to track 72.
C. Write a lF (hex) pattern (250 KHz) on the entire track.
D. Connect oscilloscope to TP4 and TPS as described in the
radial-track alignment procedure (refer to paragraph 4.6.1).
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