TM 5-3810-307-24-1-2
4. NO DISPLAY
PROBLEM: Blank console display with no warning light shown. All crane moments have
been stopped.
START
Check fuses on central unit box.
Correct?
NO
Replace fuses.
YES
Measure crane voltage in central unit between X1:1 (+24V) on heater control board and X1:4
(ground) on connection board. X1:1,8,9,10, and 11 on heater control
board are all +24V and X1:2 and 18 are ground. Refer to Drawing 1, 3, 6 in Section 10.
If crane voltage is measured below 20V system will switch off.
Correct?
NO
Check crane power supply for faulty
crane electric or if supply is too low.
YES
Measure voltage on connection board in central unit between
X1:1 (+24V) and X1:3 (ground). Refer to Drawing 1, 3, 7 in Section 10.
Heater control board will only supply power to connection board above +10 C.
Correct?
NO
Check relay on heater control board
in central unit.
YES
Measure voltage on connection board in central unit between X4:1 (+24V)
and X4:3 (ground). Refer to Drawing 1, 3, 7 in Section 10.
Replace connection board in central unit.
Correct?
No
Diode D4, inductance L1 or capacitor C1
is faulty.
Yes
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G-10 Change-1