Electrical System Troubleshooting (Contd).
TEST OR INSPECTION
21. RCU WILL NOT LOWER FAR-SHORE END OF BRIDGE (L17-A)
Step 1. Check that KY1, KY16, KY18, and KY24 hydraulic control valve solenoid LED lights are lit
when action button 1 is depressed.
Potentiometer JR2 is used to stop launch boom at a set position in
the launching procedures.
a. If lights are lit on KY1, KY16, KY18, and KY24 control valve solenoids, check
potentiometer JR2 position 6 to see if damaged or out of adjustment. Adjust or replace
b. If potentiometer JR2 is operating and control valve solenoid lights are lit, refer to
c. Check operation of IQAN-XP and IQAN-XS LED lights. Refer to WP 0004 00 step h.
Step 2. Check to see if one or more control valve solenoid LED lights are out when action button 1
a. If light is out, check for 24 volts at control valve solenoid.
b. If connector has 24 volts, replace control valve solenoid or hydraulic control valve. Refer
c. If connector has no voltage, check wires at KL-1 buss bar pin 1 for KY1 control valve
solenoid, KL-1 buss bar pin 6 for KY6 control valve solenoid, KL-1 buss bar pin 16 for
KY16 control valve solenoid, KL-1 buss bar pin 18 for KY18 control valve solenoid, KL-1
buss bar pin 24 for KY24 control valve solenoid, and KL-1 buss bar pins 34, 35, and 48
for JR2 potentiometer. Refer to Electrical System Schematic (WP 0122 00) and repair or
d. Check wire between KL-1 buss bar pin 1 and IQAN-XS connector pins 20. Replace wire if
e. Check wires between KL-1 buss bar pins 6, 16, 18, 24, 34, 35, and 48 and IQAN-XP
connector pins 25, 35, 22, 41, 15, 17, and 1. replace wires if damaged. Refer to
END OF TESTING
22. RCU WILL NOT LOWER NEAR-SHORE END OF BRIDGE (L18-H)
Step 1. Check if winch electrical harness, control cable, or power supply cable are loose or damaged.
If loose or damaged, connect or replace winch electrical harness, control cable, or power
Step 2. Check if power supply cable is suppling power to winch electronic box.
a. If power supply cable has no power, check if fuse is blown. Replace 8 Amp fuse.
b. If fuse is good, repair or replace power supply cable. Refer to WP 0065 00, Electrical
Step 3. Check if rope loop sensor light is lit when action button 1 is depressed.
a. If light is not lit, check for loose connector on rope-loop sensor.
b. If light is lit, check if rope loop sensor is out of adjustment or damaged and adjust or
Step 4. Check if winch system has hydraulic pressure to winch control block, refer to