TM 5-3610-253-14
5-40.2 Test Light Barrier Outputs/Inputs.
MOS:
35E, Special Electronic Devices Repairer
TOOLS:
Flat Tip Screwdriver
5 mm Hex Head Key Wrench
Digital Multimeter
Extender Board
SUPPLIES:
Rubber Matting
a.
Turn off power.
(1) Turn Star-Delta switch to Y position, then to O position.
(2) Turn main power switch to O position.
b. Remove front and rear electronics enclosure covers.
c.
Extend circuit board HK.
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.
Move backgauge forward or backward as required until the backgauge
e.
position is displayed on the measurement display.
With light barrier not interrupted, check for 0 volts at pin 15 a/c.
f.
Use ground post on SCU as ground.
With light barrier interrupted, check for +5.1 V at pin 15 a/c. Use
g.
ground post on SCU as ground. If +5.1 V is not present and green LED
on left barrier housing is off, replace cable. If green LED is on and no
+5.1 V, replace circuit board LS (paragraph 5-40.52).
5-505
