4.1.2.3 PECM LEDs
The LEDs on the PECM board can help with troubleshooting problems. There are two sets of
LEDs: one on each side of the front board as shown in the diagram to the right. The bottom
set of three LEDs is the same as used on other boards. The left set is for the PECM software
and the right set is for the temperature controller software. Each will go through a separate
display on power up and normal operation. The top two sets of four LEDs each are for the
operation of each of the two temperature controllers on the front board. Heater 1 is on the left
and heater 2 is on the right side of the board.
State 1 - Power off
State 2 - Self test
State 3 - Address assignment
State 4 - Normal operation
State 5 - Warning condition; data good temporarily
State 6 - Fault condition; data invalid
Normal
Fault
Warning
PECM LED Interpretation
PECM-CTRL PCB
LEFT Heater Status RIGHT Heater status
Heater 1 Air Pressure
Heater 1 Power Activate
Heater 1 Temp Limit
Heater 1 Overtemp
Heater 2 Air Pressure
Heater 2 Power Activate
Heater 2 Temp Limit
Heater 2 Overtemp
Normal
Fault
Warning
Normal
Fault
Warning
PECM Status
Temperature
Controller
Status
PECM LEDs
General Maintenance and Troubleshooting
4.1 Analyzer Status Indicators
Maxum edition II Analyzer General Maintenance
Manual, August 2018, A5E42019842001 25
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