MONTHLY PREVENTIVE MAINTENANCE-continued

TM 11-6625-3056-12

4-6.

MONTHLY PREVENTIVE MAINTENANCE (cont)

Item

Item To Be

No.

Inspected

Procedure

Sync Time

Set controls as follows:

PATTERN

Keep at SHORT

OPERATION

2W-R

CORRELATOR LOOP

Keep at OPEN

DATA ON/OFF

OFF

RATE SELECT

Keep at O (38.4 kb/s)

DISPLAY SELECT

Keep at OFF

Keep DATA OUT connected to DATA IN:

Set DISPLAY SELECT to SYNC TIME MSEC and press RESET:

Display must read 0.

Set DATA ON/OFF to ON:

Display must rapidly advance count (1000 counts per second).

Set OPERATION to 4W:

Display must stop advancing count and must display some number (representing length of

time, in milliseconds, from the time DATA ON/OFF control was set to ON and the time

OPERATION control was set to 4W).

Press RESET:

Display must read 0.

10.

Two-Wire

Set controls as follows:

Operation

PATTERN

Keep at LONG

OPERATION

Keep at 4W

CORRELATOR LOOP

Keep at CLOSED

DATA ON/OFF

Keep at ON

RATE SELECT

Keep at 0 (38.4 kb/s)

DISPLAY SELECT

Keep at ERRORS

Keep DATA OUT connected to DATA IN.

Set OPERATION to 2W-T:

ACTIVITY indicator must extinguish.

Set OPERATION to 2W-R:

END

ACTIVITY indicator must remain unlit.

4-7