READ DATA MODE

TM 11-6625-3024-14/EE641-AC-MMA-010/E154 SYSEX/TO 33AA50-5-1-1

2. Set the DATA CONTROL switches as

CONTROL switches as

2. Set the DATA

follows:

CONT. READ

- ON

- OFF

CONT. READ

- OFF

REPEAT ON ERRORS

REPEAT ON ERROR

- ON

4K BLOCK

- OFF or ON

- OFF

SHIFT ONES

(optional)

- ON

BLOCK MODE

SHIFT ONES

- OFF

- ON

WRITE

BLOCK MODE

- ON

WRITE

- ON

3. Press MOTION CONTROL-RUN FORWARD

3. Press RUN FORWARD switch. Verify that

switch. Verify that the STOP indicator extinguishes

RUN FORWARD indicator lights and STOP indi-

and the RUN FORWARD and WRITE RESET

cator extinguishes.

indicators flicker.

The Exerciser always reads data from tape in the

Continuous Read is a read function and can be

WRITE/RUN FORWARD mode. Repeat on error

selected for Read or Write mode of operation. The

commands the transport to repeat one block of

Exerciser's read circuits are not normally enabled

data (read function) each time an error is detected

until the tape transport has obtained near normal

by the read circuits. The Exerciser automatically

running speed (approximately 14 milliseconds).

disables the write circuits and repeats the block in

Continuous Read mode enables the Exerciser read

error. If the error is recovered within three passes,

circuits simultaneously wih the motion command.

the transport then continues running in the WRITE

This allows the detection of errors prior to the

mode. If the error is not recovered in three passes

transport obtaining normal running speed.

of the data block, the error is displayed as a HARD

ERROR. The Exerciser then continues to write

4. Press STOP switch to stop transport motion.

blocks of data until another error is detected (see

Verify that STOP indicator lights and RUN FOR-

paragraph 4-5),

WARD indicator extinguishes.

Note

5. Press the CONT. READ, 4K BLOCK,

BLOCK MODE and WRITE switches. Verify that

The DATA CONTROL-WRITE indi-

respective indicators extinguish.

cator will extinguish each time the repeat

6. Press REWIND.

on error operation is being performed.

4. Press STOP switch to stop transport motion.

Verify that STOP indicator lights and RUN FOR-

3-12 READ DATA MODE

WARD indicator extinguishes.

Read Data mode enables data to be read as

recorded on tape.

5. Press REPEAT ON ERROR, 4K BLOCK (if

selected), BLOCK MODE and WRITE switches.

1. Ensure that Exerciser is in the Standby mode

Verify that respective indicator lights extinguish.

(see paragraph 3-4).

6. Press REWIND.

2. Press MOTION CONTROL-RUN FORWARD

switch. Verify that the STOP indicator extinguishes

3-11 CONT. READ

and the RUN FORWARD indicator lights.

This function can be used to check transport

The Exerciser will read data as recorded on tape.

motor noise or gap noise.

The PARITY ERRORS display will count and dis-

play detected errors. The VRC ERROR and LRC

1. Ensure that Exerciser is in the Standby mode

ERROR indicators will display the type of error

detected.

(see paragraph 3-4).

3-15