TM
11-5835-243-34/EE641-AA-MMl-010/E154
MTT/TO
31S3-4-110-1
h. End of Tape (EOT).
(2) Set cartridge ADDRESS switch to 1. On
(1) Depress FAST switch on exerciser, then
exerciser set SELECT 1 on. Set all other SELECT
depress RUN FORWARD switch. Observe that
switches off. Depress RUN FORWARD switch on
EOT indicator on exerciser is off for approximately
exerciser. Observe that capstan motor rotates.
two minutes and then on momentarily prior to tape
(3) Depress STOP switch on exerciser. Observe
cartridge rewinding.
capstan motor shaft for a lo-second period to
(2) When exerciser reports IN REWIND
determine that it does not rotate.
status, depress FAST switch and observe that EOT
(4) Cycle exerciser POWER ON/OFF TRANS-
indicator is off.
PORT switch off, on, off, on at approximately two-
(3) Allow tape transport to continue rewinding
second intervals. Verify that when cycling tape
until tape stops at BOT, as indicated by both BOT
transport power does not cause capstan motor shaft
indicators being on.
to rotate.
d. Forward/Reverse.
3-11. Write Test
(1) Depress exerciser RUN FORWARD switch.
NOTE
Observe that capstan rotates in a clockwise (CW)
If exerciser reports EOT and then IN
direction. Depress STOP switch.
REWIND before following test is
(2) Depress exerciser RUN REVERSE switch.
completed, allow tape to rewind to BOT.
Observe that capstan rotates in a counterclockwise
When BOT status is reported, depress
(CCW) direction. Depress exerciser STOP switch
RUN FORWARD switch and continue
and remove tape from capstan shaft.
test.
e. Write Permit.
(1) Observe that WRITE ENABLE indicator
a. File Protect.
on exerciser is on.
(1) Remove tape cartridge and set write protect
(2) Remove tape cartridge and position write
detent to PROT position. Install cartridge and
protect detent in PROT position. Install and lock
verify that FILE PTCT indicator on tape transport
cartridge in place and close tape transport access
is on. Close and lock access door.
door.
(2) Depress WRITE DATA ALL 1 and WRITE
(3) Observe that WRITE ENABLE indicator
switches on exerciser. Depress RUN FORWARD
on exerciser is off and tape transport FILE PTCT
switch. Using an oscilloscope, observe signal at
indicator is on.
TP1, TP2, and TP3 of digital read/write circuit
f. Ready Line.
cards A1, A2, and A3.
(1) With access door closed and tape cartridge
(3) Verify that observed signal in each case is
in place, observe that READY indicator on exer-
broadband noise measuring approximately 0.5v
ciser is on.
peak-to-peak.
(2) Open access door. Observe that READY
(4) Depress REWIND switch on exerciser.
indicator is off.
when tape transport reports BOT status, remove
(3) Remove cartridge, and close and lock door.
tape cartridge and set write protect detent out of the
Observe that READY indicator is off.
PROT position. Reinstall tape cartridge and verify
g. Beginning of Tape (BOT).
that FILE PTCT indicator on tape transport is off.
(1) Rotate tape cartridge write protect detent
Close and lock access door.
out of PROT position and position BOT reflective
b. Write Enable.
strip adjacent to cartridge mirror. Install tape
(1) Set test oscilloscope to 50 microsec/cm and
cartridge in tape transport. Close and lock access
2V/cm.
door.
(2) Depress WRITE and WRITE DATA ALL 1
(2) Observe that BOT indicator on tape trans-
switches on exerciser. Depress RUN FORWARD
port and exerciser are on, and that EOT indicator on
switch on exerciser.
exerciser is off.
(3) Observe that the signal present at TP1,
(3) Depress RUN FORWARD switch on
TP2, and TP3 of digital read/write circuit cards Al,
exerciser. Observe that BOT indicators instantly
A2, and A3 is 7.0 volts peak-to-peak minimum with
turn off. Depress STOP switch on exerciser.
a period of 100 8 microseconds (fig. 3-2). Depress
STOP switch on exerciser.
3-4
