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M400E Ozone Analyzer Operator’s Manual General Troubleshooting & Repair of the M400E Analyzer
13.6.1.3. UV Lamp Temperature
There are three possible causes for the UV Lamp temperature to have failed.
The UV Lamp heater has failed.
Check the resistance between pins 5 and 6 on the six-pin connector adjacent to the UV Lamp on the
Optical Bench.
It should be approximately 30 Ohms.
Assuming that the I
2
C bus is working and that there is no other failure with the Relay board, the FET
Driver on the Relay Board may have failed.
Using the
PHOTO_LAMP_HEATER parameter under the SIGNAL I/O function of the DIAG menu, as
described above, turn on and off the UV Lamp Heater (D15 on the relay board should illuminate as
the heater is turned on).
Check the DC voltage present between pin 1 and 2 on J13 of the Relay Board.
If the FET Driver has failed there will be no change in the voltage across pins 1 and 2.
If the FET Driver Q2 checks out OK, the thermistor temperature sensor in the lamp assembly may have
failed.
Unplug the connector to the UV Lamp Heater/Thermistor PCB, and measure the resistance of the
thermistor between pins 5 and 6 of the 6 pin connector.
The resistance near the 58
o
C set point is ~8.1k ohms.
13.6.1.4. IZS Ozone Generator Temperature (Optional)
There are three possible causes for the Ozone Generator temperature to have failed.
TheO
3
Gen heater has failed.
Check the resistance between pins 5 and 6 on the six-pin connector adjacent to the UV Lamp on
theO
3
Generator.
It should be approximately 5 Ohms.
Assuming that the I
2
C bus is working and that there is no other failure with the Relay board, the FET
Driver on the Relay Board (see 13.7.5) may have failed.
Usi
ng the
O3_GEN_HEATER parameter under the SIGNAL I/O function of the DIAG menu, as
described above, turn on and off the UV Lamp Heater.
Check the DC voltage present between pin 1 and 2 on J14 of the Relay Board.
If the FET Driver has failed there should be no change in the voltage across pins 1 and 2.
If the FET Driver checks out OK, the thermistor temperature sensor in the lamp assembly may have
failed.
Unplug the connector to the Ozone Generator Heater/Thermistor PCB, and measure the resistance
of the thermistor between pins 5 and 6 of the 6 pin connector.
04315 Rev. C1 245