TM 11-5820-890-30-4
6-13. OPERATIONAL CHECK. Continued
Step 1. SELF-TEST.
Action
Response
b. Connect equipment as shown in figure 8-7.
b. No response.
c. Set 28V: ON.
c. Control-monitor repeats self-test every 5
seconds. All display segments light for 3
seconds, then “Gd” is displayed for 2
seconds.
IF
THEN
All display segments
Go to chart 1.
do not light.
Any display segment
Control-monitor
does not light.
front panel (7A1)
is bad.
Display stuck with all
Go to chart 2.
segments lit.
“F1” is displayed.
Microcontroller
(7A2) is bad.
“F2” is displayed.
Go to chart 3.
d. Check DIM control operation.
d. CCW dims display, CW brightens display.
if not, the control-monitor front panel (7A1)
is bad.
Step 2. OUTPUT CHECK.
Action
Response
a. Read scope CHAN: A.
a. Burst of 0.8 V p-p to 1.8 V p-p (0 V dc)
T: 0.2 ms/DIV V: 0.2 V/DIV
referenced sine wave every 5 seconds. if
not, go to chart 4.
b. Set RESPONSE: 9.
b. Same as in step a. If not, go to chart 4.
Read scope CHAN: A.
co Set RESPONSE: 10.
c. Same as in step a. If not, go to chart 4.
Read scope CHAN: A.
6-12
