New Holland CX720 Repair Manual page 1450

Control module - Overview (A.50.A.91 - C.40.B.10)
Each CCM module has two main power supplies. Keep Alive power is supplied to the module at interior connector
pin 1, while the main power supply is provided from the key switch at the interior connector pin 4. The module will
shutdown if the voltage drops below 9 V or exceeds 18 V on either of these two circuits. Key switch power is also
used to supply the 5 V and 8 V regulators for voltage outputs to sensors and potentiometers.
Each CCM module has three main ground wires to provide a ground path for all sensors and most valve outputs.
These three ground wires are linked together internally, but provide a solid ground path for the module. The module
may continue to function if one or two of these ground wires are broken, but sensor reading and other functions may
become erratic.
Some circuits on the CCM's provide their own power supply through the engaging switch. This ensures that if power
is ever lost through the switch into the module, the output from the module is immediately disengaged. These circuits
are the ground speed hydrostat circuit (power supplied through the S22 Neutral switch), thresher engage and feeder
engage circuits.
H-bridge circuits in the modules are used to power high current draw components, such as motors and actuators, and
have their own dedicated power supplies and grounds, as listed in the charts below.
CCM1
Power Supply
X018 pin 1 (F-39)
X018 pin 4 (F-38, key switch)
X020 pins 29 & 30 (F-22)
X020 pin 7 (F-24)
X019 pin 11 (F-24)
X019 pin 2 (F-43)
X019 pin 9 (F-43)
X020 pin 11 (F-44)
CCM2
Power Supply
X015 pin 1 (F-39)
X015 pin 4 (F-38, key switch)
X017 pins 29 & 30 (F-25)
X017 pin 7 (F-23)
X016 pin 11 (F-23)
X016 pin 2 (F-36)
DISTRIBUTION SYSTEMS - ELECTRONIC SYSTEM
X018 pin 8, X019 pins 12 & 18
X020 pins 9 & 10
X020 pin 16
X019 pin 3
X015 pin 8, X016 pins 12 & 18
X017 pins 9 & 10
X017 pin 16
X016 pin 3
A.50.A / 56
Ground
Ground
2 4/7/2006
Components Affected
Keep Alive power
Main power; all potentiometers,
speed & position sensors
Main module grounds
Shoe Leveling Actuator
Cleaning Fan Adjust motor
Feeder Reverser actuator
Concave Clearance actuator
Grain Bin Covers actuator
Chaff Spreader valve
Backup Alarm
Vertical Knives
Rear Wheel Assist valve
Feeder Jog Fwd valve
Feeder Jog Rev valve
Dual Range valve
Components Affected
Keep Alive power
Main power; all potentiometers,
speed & position sensors
Main module grounds
Transmission Shift motor
Reel Speed motor
Throttle actuator (Bas mech)
Rotary Screen Brush actuator
Unload Cross Auger valve
Fuel Shutoff / Terminal 15
Park Brake Disengage valve