9−14
62-11389
NO YES
NO
NO
YES
NO
NO
NO
(MPR Code #1)
YES
YES
YES
NO
YES
NO
YES
YES
NO
NO
NO
NO
NO
YES
YES
NO
YES
YES
NO
(MPR Code #2)
NO
START HERE
Is unit equipped
with two way com-
munications?
Disconnect two way communications from
unit and install J1 jumper. This will eliminate
remote communication from the system.
Replace the fuse.
Did you find and
correct the
condition?
Is Micro Status
LED blinking?
Check the F1 fuse.
Is the fuse blown?
Check Micro Status
LED blink rate.
Return to
the top of
this chart
Micro Status LED
is blinking at 1
second ON & 1
second OFF.
Micro Status LED is blinking
at 1/2 second ON & 1/2
second OFF.
Check ground
connectors at the
battery, starter,
engine block and
inside the control box.
Did you find and
correct the condition?
Inspect and repair poor
connections at the micro
and display. Did you find
and correct the condition?
Check voltage
between QC1 & QC2.
Voltage should read
11 volts or higher.
Is voltage within range
Ensure the operator is waiting
long enough by turning the
Main Power switch ON and
waiting 2minutes for the display
to come on. Did you find and
correct the condition?
Load current version
of software from http://
www.transcentral.
carrier.com Did the
current version of
software load correctly?
Check Wiring for high
resistance or an open.
Did you find and
correct the condition?
Is the
system
operat-
ing OK
now?
Inspect and repair
he 3 wiring
harnesses for the
micro and display:
the cable from the
micro to the back of
the display, the
cable from the back
of the display to the
display itself and the
ribbon cable from
the keypad to the
board. Did you find
and correct the
condition?
Go To Condition 8 - Program-
ming Problems with PC
Cards if using a PC Card to
upgrade software. Did the
software load correctly?
Did the loading
of the software
correct the
problem?
Check voltage
between 5MPA1 &
QC2. Voltage
should read 11
volts or higher. Is
voltage
within range?
System OK
Re-install two
way commu-
nication if dis-
connected
earlier.
Check Wiring for high
resistance or an open.
Did you find and
correct the condition?
Replace micro and operate
system in order to verify repair.
Did you find and correct the
condition?
Review the results of
above tests with your
supervisor. If necessary,
go to the beginning of the
tree & test again.
Remove new micro and re-install old micro
back into the unit. Micro is not the fault.
Review results of above tests with your
supervisor. If necessary, go to the beginning
of the tree & test again.
System OK,
re-install two way communica-
tions if disconnected earlier.
System OK,
re-install two way communica-
tions if disconnected earlier.
YES
YES
NO
YES
Figure 9−5 Micro Diagnostic Tree - Condition 1 - Main Power Switch On - Unit Does Not Operate
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