HOIST AND COUNTERWEIGHT RT9130E SERVICE MANUAL
5-16 Published 08-25-09, Control # 077-04
CPU needs to be reprogrammed. The following should be
used only after using the diagnostic LEDs.
1. Use a digital voltmeter or multimeter to measure if
voltage is present on wire 27 at circuit breaker or fuse
feed. Replace fuse, circuit breaker or wire if necessary.
2. Make sure 12 volts are measured across terminals A
(red wire) and C (black wire) of connector DT3S. If there
is no voltage present, check wiring and circuit breaker
(fuse).
3. If voltage is present but green LED does not light,
replace the CPU.
Red LED
With the green LED on, and the hoist rotating, the red LED
should be pulsing on and off and should stop pulsing when
the hoist stops rotating. If the red LED does not pulse on and
off, then either the CPU is defective or the sensor is
defective. The following should be used only after using the
diagnostic LEDs.
1. Measure the sensor input voltage from +10V terminal 1
to ground terminal 3 on the DTM3S connector. Measure
the pulsating return signal from +5V terminal 2 to ground
terminal 3 on the DTM3S connector. If the +10V is
applied to the sensor input and the +5V pulsating signal
is applied to the DTM3S connector terminal 2 and the
red LED still does not pulsate, the CPU is defective and
should be replaced.
2. If the +5V signal on terminal 2 does not oscillate, the
sensor is defective or the sensor adjustment air gap
from the gear teeth is too wide. Adjust the sensor
position and retest. If oscillation does not occur, the
sensor should be replaced.
Amber LED
With the green LED on continuously, and the red LED
pulsating (hoist is rotating), the amber LED should also be
pulsating. If the amber LED does not pulse on and off, a worn
or damaged CPU could be the problem. If the amber LED
pulsates, but the thumb thumper solenoid does not, then the
thumper solenoid is worn or damaged and should be
replaced or there are broken or pinched wires in the system.
The following should be used only after using the diagnostic
LEDs.
1. Using a digital voltmeter, check to see if the CPU is
receiving 12 volts between terminals A (red wire) and B
(black wire) of connector DT3S. If no voltage is present,
check wiring and circuit breaker or fuse.
2. Using a digital ohmmeter, check to see if the thumper
solenoid resistance is 12 ± 2 ohm. If the resistance does
not measure correctly the solenoid is worn or damaged
and should be replaced.
3. Using a digital voltmeter, measure the voltage on
thumper solenoid white feed wire 27. The voltage should
measure 12V. If voltage is not within ± 10 percent, check
the voltage at the fuse or circuit breaker. If the voltage
does not measure within ± 10 percent, trace the high or
low volts back to the source and repair the defect. If the
voltage does measure within ± 10 percent, the thumper
solenoid white feed wire 27 is defective; replace it.
4. After disconnecting both ends of wire 508 (main hoist) or
509 (auxiliary hoist) between the thumper solenoid and
the CPU, measure the resistance of wire 508 or 509. If
the resistance measures more than 0.5 ohm, the wire is
damaged; replace it.
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