Floppy Disc Test Procedure - HP 64100A Service Manual

Model 64100A - Performance Verification
4-26. FLOPPY DISC TEST PROCEDURE.
Purpose:
NOTE
A formatted disc must be used when performing
the floppy PV. However, the WRITE electronics are not
tested if a disc containing data on track
34
is present in
the drive being tested. Furthermore, the floppy PV will
only verify to an
85~
confidence level that the mini drives
are operational. In order to completely test the drives the
floppy diagnostics must also be done. Refer to the local
mass storage manual for more information regarding the
floppy PV and the diagnostic tests.
The FLOPPY DISC TEST tests several functions of the two floppy disc drives
and the controller board electronics.
Area Tested:
CPU and I/O data lines,
the controller board
mechanics, and the CPU,
floppy controller board electronics, the cable from
to the drives, drive READ/WRITE electronics and
I/O and interface circuitry.
Operation:
a. Response from floppy controller chip is tested by writting a pattern to
the track register and reading it back.
b. When initiated, each floppy drive is cycled through the following series
of tests:
1. The drive is selected.
2. The drive is restored (head moved to track 00).
3.
Step inward to track 1 (check TRKOO indicator OFF)
4. Step out to track 00, check track 0 indicator ON.
5.
Read all sectors on track 0, side 0; check for all
errors.
6.
Step to track
34,
read all sectors on both sides.
c. The PV routines now check to see if there is any data on track
34.
Track
34
will be a spare track on a disc with no bad tracks. However, if there
is a bad track on a disc, then track
34
is allocated as useable even
though it may contain information.
MF 4-21