TM 5-3610-253-14
Table 5-9. DIRECT/GENERAL SUPPORT TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
11.
WITH CUTTING BUTTONS DEPRESSED, CUTTING AND CLAMPING ARE INOPERATIVE, LIGHT
BARRIER SIGNAL LAMP IS LIT - Cont
Check for +24 V at pin 9 of plug connector ST 18 with both
Step 3.
cutting buttons depressed, using pin 5 of plug connector ST 70 as
ground.
(a) If correct, replace PC card FZ.
(b) If +24 V is missing, proceed to step 4.
Check for +24 V at test point G1 on ST motherboard, using pin 5 of
Step 4.
plug connector ST 70 as ground.
(a) If +24 V is present, check continuity of contractors C15
and C12 and replace defective contactor.
(b) If +24 V is missing, proceed to step 5.
Check for 30 V ac input to fuse e4.
Step 5.
(a) If voltage is present, replace ST motherboard (paragraph
(b) If 30 V ac is missing, replace control transformer (paragraph
Check for zero volts dc at test receptacle 9R1 on PC card 9 after
Step 6.
cutting buttons are depressed.
(a) If voltage is present, replace PC card 9 (paragraph 5-20. 11).
(b) If zero volts dc are present, proceed to step 7.
Check for +24 V at pin 7 of plug connector SZ 40 when cutting
Step 7.
buttons are depressed. Use pin 5 of plug connector ST 70 as ground.
(a) If voltage is missing, replace PC card 9 (paragraph 5-20.11).
(b) If voltage is present, proceed to step 8.
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