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24 160 19_0106E_Rev D.doc / 2005-06-27 / rk.
Defect on main board. Replace main board.
Refer to system wiring diagram and main board
replacement Procedure.
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Connect the boom base connector. Connect wire #5 back to the terminal
X1:9 on the connection board. Refer to system wiring diagram.
Correct?
Faulty wiring between boom base connector and central
unit. Check connections and replace cable if necessary.
Disconnect X1:9 and X1:10. Check main board function by installing a temporary
resistor, 4700 Ohms between X1:9 and X1:10 in central unit. With resistor connected
alarm should be inactive.
Refer to system wiring diagram.
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 system wiring diagram.
Reconnect Wire #5 to X1:9 and Wire #6 to X1:10
Refer to system wiring diagram.
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