TM 5-3610-253-14
h. Check pin 16 a/c for +12 V output. Use ground post on SCU as ground.
If +12 V missing, replace HK circuit board (paragraph 5-40.31).
i.
Turn off power.
(1) Turn Star-Delta switch to Y, 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.
5-528
