TM 5-3610-253-14
WARNING
Electrical shock hazard. You must stand on rubber matting as a protective
measure before performing this procedure. Death or serious injury may
occur.
d. Turn on power.
(1) Turn main power switch to I position.
(2) Turn Star-Delta switch to Y position. After the main motor has
reached full speed, turn switch to
position.
(3) Press control power on switch.
e.
Move backgauge forward or backward as required until the backgauge
position is displayed on the measurement display.
f. Check pin 16 a/c for +12 V.
Use ground post on SCU as ground.
If +12 V is not present, replace HK circuit board (paragraph 5-40.31).
g.
h.
If problem still exists, replace SCU motherboard (paragraph 5-40.34).
i.
Turn off power.
(1) Turn Star-Delta switch to Y position and then to O position.
(2) Turn main power switch to O position.
Remove extender board and reinstall HK circuit board.
j.
k. Reinstall front and rear electronics enclosure covers.
5-532
