Atc Controller Test (Connector J8 Test Points) - New Holland T8010 Manual

Section 50 - Climate Control - Chapter 1

ATC Controller Test (Connector J8 Test Points)

The following tests determine whether the ATC
controller requires replacement, since it tests primary
input and output circuits. Some test steps isolate
system problems to specific circuits which can
simplify general troubleshooting.
In general, the service technician should resist the
temptation to replace the controller as the solution to
all A/C system problems. Double check your test
results to avoid a return service call. The absence of
key control voltages or switched ground does require
controller replacement.
* The ATC controller and many components are grounded
to "HVAC ground." HVAC ground is both a grounding bolt at
the rear of the HVAC box and chassis ground at ring
terminal 173B through C139-J on wire 443-Bk.
50-1-29