Rap 2.44 Knife Up Sensor - Challenge CMT-130TC Service Manual

RAP 2.44 Knife Up Sensor

Input 31
This sensor detects when the knife assembly
reaches its top position. It is mounted to the
barrel of the hydraulic cylinder (Figure 2-68).
The sensor cable is labelled "U"
Possible Fault Indicators

"Knife failed to leave up limit in time"
message is displayed.
Initial Actions
Check for loose or damaged wire 51 at the elec-
trical panel.
Procedure
1. Switch the main power ON and press the
green start button. Is the knife assembly up
all the way?
Y N
Perform RAP 2.15 Starter Circuit.
2. Switch the main power OFF and then ON.
Go to the diagnostic screen (GP 6.2 In-
put/Output Diagnostics). Does the diagnostic
screen show input "Knife Up" on?
Y N
Short wire 51 to 74 at the main PWB. On
the diagnostic screen does input "Knife Up"
switch on?
Y N
Disconnect power and replace the main
PWB (REP 4.23 Main PWB Replace-
ment).
Adjust the sensor (GP 6.5 Proximity Sen-
sors) and replace if faulty (PL 5.4 Main As-
sembly 59000 (4/14)).
2. Status Indicator RAPs
3. Disconnect wire 51 at the main PWB. On the
diagnostic screen does input "Knife Up"
switch off?
Y N
Disconnect power and replace the main
PWB (REP 4.23 Main PWB Replacement).
4. Adjust the sensor (GP 6.5 Proximity Sen-
sors) and replace if faulty (PL 5.4 Main As-
sembly 59000 (4/14)).
Figure 2-68. Knife Up Sensor
MAY 2019
2-52 CMT-130TC Book Trimmer