MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15
Thomson Technology
82
14. TROUBLE
SHOOTING
A number of problems can cause the MEC 2 controller not to function properly. Refer to the
following list of typical problems. Consult the factory for any detailed information or for any
problems not listed.
CAUTION
!!!
Before opening the enclosure to perform any service task, it is imperative to isolate the
control system from any possible source of power. Failure to do so may result in serious
personal injury or death due to electrical shock.
Service procedures must be undertaken by qualified personnel only!
SYMPTOM
CORRECTIVE ACTION
Controller does not power up even with correct DC
power applied
- Check that there are no wiring errors/short
circuits connected to the controller.
Note:
The MEC 2 contains an electronic fuse that
triggers upon an over load condition and
does not reset until the supply voltage is
removed, and over load condition is
corrected.
LCD Display is not operational
- Check that the controller’s microprocessor
is running by observing a red flashing
“watchdog” LED on the rear of the PCB.
- Check that there is sufficient DC supply
voltage to input terminals B+ & B- (10-
30Vdc).
- Verify that the LCD contrast potentiometer
(R115) on rear of PCB is adjusted for good
pixel resolution for the operating
temperature of the unit.
Controller cannot be “Reset”
- Check that the controller is set to the OFF
mode before trying to reset.
- Check that the engine has come to a
complete stop before trying to reset.
Summary of Contents for MEC 2
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