TM 5-3610-286-20
Table 2-5. Organizational Troubleshooting (cont).
Malfunction
Test or inspection
Corrective action
17. DELlVERY PILE BOARD WILL NOT LOWER (cont).
Step 7.
Using a multimeter set to range higher than 220V ac, check for 220V ac between
points U5, V5, W5, and ground with contactor (c8) relay button pressed.
If power is present, go to step 8.
If no power is present, go to step 10.
Step 8.
Using a multimeter set to ohms range, check for continuity between points listed
for the following relays.
Relay (d229): Point 33 and Point 34, Point 43 and Point 44
Relay (d230): Point 33 and Point 34, Point 43 and Point 44
If continuity is present, go to step 9.
If continuity is not present, replace relay(s) (d230 and/or d299)
(para. 2-93).
Step 9.
Using a multimeter set to ohms range, check for continuity between points (220)
and negative ( - ) on terminal strip.
If continuity is present, go to step 10.
If no continuity is present, replace delivery brake electromagnet (s9)
(para. 2-64).
Step 10.
Using a multimeter set to range greater than 220V ac, check volts between L1 and
L2, L2 and L3, and L1 and L3 motor protection switch (a8).
If 220V ac is present, go to step 5 to recheck contactor (c8).
If 220V ac is not present, replace motor protection switch (a8)
(para. 2-93).
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