TM 5-3610-253-14
b. Remove front and rear electronics enclosure covers.
c.
Extend HK circuit board.
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.
Check pins 23 a/c and 24 a/c for +24 V. Use ground post on SCU as
f.
ground. If +24 V missing, check plug connector and cable. Check
output of PS 24 (paragraph 5-40.63). If all correct, replace SCU
motherboard (paragraph 5-40.34).
Check pins 31 a/c and 32 a/c for +42 V. Use ground post on SCU as
g.
ground. If +42 V missing, check plug connector and cable. Check +42
V output of PMD circuits. If all correct, replace SCU motherboard
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