TM 5-3810-307-24-1-2
5a. ANTI-TWO BLOCK PROBLEM (SINGLE SWITCH) cont'
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Remove blue wire from terminal 7 on terminal board in cable reel.
Measure the anti-two block signal in the cable reel with an ohmmeter between X1: Brown and
X2: Red wires on the slip ring.
Switch closed = 4700 500 Ohms
Switch open => 1 Megaohm
. Refer to Drawing 2, 4, 11 in Section 10.
Fault in wiring between boom nose junction box and
Correct?
NO
cable reel. Check for damaged length cable and wiring.
Refer to Drawing 2 in Section 10.
If broken length cable, Refer to Section 3.
YES
Measure the anti-two block signal in the cable reel with an
ohmmeter between terminals 7 and 8 on terminal board.
Switch closed = 4700 500 Ohms
Switch open => 1 Megaohm
Reconnect blue wire to terminal 7 on terminal board in cable reel.
Refer to Drawing 2, 4, 12 in Section 10.
Correct?
NO
Replace slip ring in cable reel.
Refer to Drawing 2, 4, 11 in Section 10.
YES
Unplug cable assembly from Central Unit to Boom Base Junction Box. Measure the
anti-two block signal in boom base junction box between terminal 5 and 6 with an ohmmeter.
Switch closed = 4700 500 Ohms
Switch open => 1 Megaohm
Reconnect cable assembly
Refer to Drawing 2, 13 in Section 10.
Fault in 7 conductor cable between cable reel and
Correct?
NO
boom base junction box.
Refer to Drawing 2, 4, 13 in Section 10.
YES
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Change-1 G-13
