Flowcharts
Rev A 05/01/01 // SB
190113_A
19
Defect on main board. Replace main board.
Refer to Drawing 4 in Section 4 and
Replacement Procedure 3 in Section 5.
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Connect wire #5 back to the terminal X1:31 on the connection board.
Refer to Drawing 3 in Section 4.
Correct?
Faulty wiring between boom base box and central unit.
Check connections and replace cable if necessary.
Disconnect X1:31 and X1:32. Check main board function by installing a temporary
resistor, 4700 Ohms between X1-31 and X1-32 in central unit. With resistor connected
alarm should be inactive.
Refer to Drawing 3 in Section 4.
Correct?
End
NO
YES
NO
Turn system power off. Check Anti-Two-Block signal in central unit with ohmmeter
measure between X1:31 and X1:32.
Anti-Two-Block switch closed = 4700 Ohms ±50 0Ohms
Anti-Two-Block switch open => 1 Megaohm.
Refer to Drawing 3 in Section 4.
Reconnect Wire #5 to X1:31 and Wire #6 to X1:32
Refer to Drawing 3 in Section 4.
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