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WRITE CURRENT SWITCH (XC AND IC)
The XC option allows the host controller to
switch the Write Current independently of the
drive's onboard microprocessor. It is factory
installed.
3. Reinstall the jumpers in their original
configuration.
4. Power on the drive.
3.7
DISKETTES
To implement the IC option, remove the XC
jumper, then install a jumper at IC.
xc
X
IC
X
WRITE CURRENT
SWITCHING
External Write Current
switch.
Microprocessor automat-
ically switches Write Cur-
rent at Track 43.
The TM848-1E and TM848-2E drives use an
IBM-compatible, eight-inch diskette. Disk-
ettes are available with a single index hole or
with multiple (index and sector) holes.
Diskettes with a single hole are used when
soft sector format is required. Multiple hole
diskettes provide sector information through
the use of an index sensor and electronics.
DIAGNOSTIC MODE OF OPERATION
(DM, DL, M1, M3, M4)
The test programs allow the user to test some
aspects of drive operation without the use of
special test equipment. The programs allow
the user to isolate the problems of the drive.
The diagnostic mode provides 16 tests (see
Table 3-4).
To enter the diagnostic mode:
1. Make a note of which j urnpers are
installed for normal operating condi-
tions (see Table 3-3).
2. Remove the DL, Ml, M3, and M4
jumpers.
3. Install the DM jumper, and supply
power to the drive.
4. Using the DL, Ml, M3, and M4
jumpers, select the diagnostic test
desired by inserting the j urnper accord-
ing to Table 3-4.
To exit the diagnostic mode:
1. Remove power from the drive.
2. Remove the DM, DL, Ml, M3, and M4
jumpers.
3-14
Figure 3-5 illustrates the diskette used with
the drive. This recording media is a flexible
diskette enclosed in a protective jacket. The
diskette, free to rotate within the jacket, is
continuously cleaned by its soft fabric lining
during normal operation.
LOADING THE DISKETTE
The drive is loaded by inserting the diskette,
with its head aperture forward, into the front
slot of the drive. Access to the diskette loading
slot is obtained by opening the front lever.
The diskette should be carefully inserted until
it is solidly against the back stop.
CAUTION
Damage to the center of the disk-
ette may result if the door is
closed when the diskette is not
properly inserted. This prevents
reliable recovery of the recorded
data.
WRITE PROTECT TAB
The drive is equipped with a Write Protect
Sensor Assembly. This sensor operates in con-
junction with the diskette, which has a slot
cut in the protective jacket.
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