TM 5-3810-307-24-1-2
5b. ANTI-TWO BLOCK PROBLEM (DOUBLE 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 between X1:Brown and X2:Red
wires on the slip ring.
Anti-two block switch(es) closed = 4700 500 Ohms
Anti-two block switch(es) open => 1 Megaohm.
Refer to Drawing 2, 4, 11, 22 in Section 10.
Fault in wiring between boom nose junction box and cable reel.
Correct?
NO
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.
Anti-two block switch(es) closed = 4700 500 Ohms
Anti-two block switch(es) open => 1 Megaohm
Reconnect blue wire to terminal 7 on terminal board in cable reel.
Refer to Drawing 2, 4, 12, 22 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 switch signal in boom base junction box between terminal 5 and 6 with an ohmmeter.
Anti-two block switch(es) closed = 4700 Ohms 500 Ohms
Anti-two block switch(es) open => 1 Megaohm
Reconnect cable assembly.
Refer to Drawing 2, 13, 22 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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G-16 Change-1
