TM
11-5835-243-34/EE641-AA-MMl-010/E154
MTT/TO
31S3-4-110-1
Power ON/OFF
TRANSPORT CURRENT jacks on exerciser.
SYSTEMS
On
(2) Depress FAST and RUN FORWARD
switches on exerciser.
Verify that STOP
Depress PROCESSOR
indicator is ON.
RESET
(3) Verify that EOT indicator on exerciser
lights momentarily at EOT and cartridge rewinds to
If not, depress
(on connector panel)
RESET again.
BOT. Verify that current does not exceed 2.04
On
SELECT 1
amperes.
c. Forward Skew and Tape Certification.
Power ON/OFF TRANS- On
(1) Set FAST switch off. Set WRITE DATA
PORT
ALL 1 and WRITE switches on. Reset PARITY
c. Set tape transport controls as follows:
ERRORS counter to zero.
On
Power ON/OFF
1 Verify that exerciser
(2) Connect CH1 of oscilloscope to TP6 of
ADDRESS
digital read/write circuit card A3 and CH2 to TP4 of
SELECTED in-
dicator is on.
Al (tracks 1 and 9, respectively).
(3) Set oscilloscope vertical mode to
3-19. Magnetic Tape Cartridge Functional Test
ALTERNATE, TIME/DIV to two microseconds,
and VOLTS/DIV to 10 (both channels). Set CH1
NOTE
TRIGGER to POSITIVE.
Ignore all indications except as specified
(4) Depress RUN FORWARD switch on
in each step of this procedure. If the
exerciser. Observe the two channels displayed on
cartridge fails to perform as specified in
the oscilloscope and select either CH1 or CH2
this procedure, refer to tape cartridge
TRIGGER that allows positive-going edge of both
troubleshooting chart (table 3-4). After a
signals to be displayed.
fault has been isolated and repaired,
repeat entire functional test.
NOTE
The skew measurements to be recorded in
a. Beginning of Tape (BOT).
steps (5) and (6) are used in para e below,
(1) Ensure that cartridge under test is not write
Forward/Reverse Skew Comparison. If
protected (detent is not in the PROT position).
the sweep is triggered by CH1, the
(2) Install cartridge under test in tape trans-
measured period is assigned a positive
port and lock in place. Close and lock tape transport
(+) value. If triggered by CH2, measured
access door.
period is assigned a negative () value.
(3) If BOT indicators on the tape transport and
exerciser are not on, depress REWIND switch on
(5) Observe time displacement of the most
exerciser. Verify that cartridge is rewinding. Tape
displaced signal. Measure and record the period
should rewind to BOT as indicated when both BOT
from start of sweep to the center of time jittered
initial signal transition (fig. 3-6). Verify that for-
indicators light.
b. BOT Indicator and Current Measurement.
ward static skew is 0.0 6.0 microseconds.
(1) Connect digital multimeter (5-amp scale) at
3-10
