TRANSPORT CURRENT jacks on exerciser.
(2) Depress FAST and RUN FORWARD
switches on exerciser.
Verify that STOP
indicator is ON.
(3) Verify that EOT indicator on exerciser
lights momentarily at EOT and cartridge rewinds to
If not, depress
(on connector panel)
BOT. Verify that current does not exceed 2.04
c. Forward Skew and Tape Certification.
Power ON/OFF TRANS- On
(1) Set FAST switch off. Set WRITE DATA
ALL 1 and WRITE switches on. Reset PARITY
c. Set tape transport controls as follows:
ERRORS counter to zero.
1 Verify that exerciser
digital read/write circuit card A3 and CH2 to TP4 of
dicator is on.
Al (tracks 1 and 9, respectively).
3-19. Magnetic Tape Cartridge Functional Test
ALTERNATE, TIME/DIV to two microseconds,
and VOLTS/DIV to 10 (both channels). Set CH1
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
signals to be displayed.
fault has been isolated and repaired,
repeat entire functional test.
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
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
b. BOT Indicator and Current Measurement.
ward static skew is 0.0 6.0 microseconds.