Challenge 130TC-A-160000, Service Manual

Page: 57 / 282

MAY 2019
CMT-130TC Book Trimmer 2-45 2. Status Indicator RAPs
RAP 2.37 Knife Latch Sensor
Input 16
The knife latch sensor detects when the latch is
disengaged (Figure 2-59).
Possible Fault Indicators

“Knife Latch did not pull
in!”
message is displayed.

“Knife Latch OUT when it
should be IN!”
message is dis-
played.
Initial Actions
Perform RAP 2.28 Knife Latch Cylinder to vali-
date operation of pneumatics.
Check for loose or damaged wire 13 at the elec-
trical panel.
Procedure
1. Switch the main power OFF. Check that the
knife latch is engaged (cylinder is extended).
2. Switch the main power ON and go to the di-
agnostic screen (GP 6.2 Input/Output Diag-
nostics
). Is input “Knife Latch In” off?
Y N
Disconnect wire 13 from the main PWB.
Does the input switch off?
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 5.5 Main As-
sembly 59000 (5/14)).
3. Short wire 13 to wire 74. Does the input
switch on?
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 5.5 Main As-
sembly 59000 (5/14)).
Figure 2-59. Knife Latch Sensor