6.2.3 Temperature Error (High)/Cooler, Temperature Error (Low)/Cooler
Monitor Timing: When READY: 1-minute interval
During analysis: No monitoring
Monitor Method: A/D converter reads the thermal sensor data embedded in the cooler unit as follows:
Room temperature less than 30qC: Temperature error when exceeds the range 12.0 -
18.0qC.
Room temperature above 30qC: Temperature error when exceeds the range 12.0 -
20.0qC.
(1) Probable Cause
1. Room temperature became outside the range between 15 - 35qC.
2. Check whether any obstacle is in front of the ventilation ventilator or the ventilator is too close to the
wall.
3. Failure of temperature sensor
4. Failure of Peltier cooler assembly
5. Failure of wiring cord (Pertier)
6. Failure of wiring cord (Temperature sensor)
7. Failure of PCB No. 6362
8. Failure of PCB No. 4086
9. Failure of main unit fan
10. Failure of cooler unit fan
(2) Confirmation by the Operator
1. Confirm room temperature by checking temperature displayed on the main unit.
2. Provide sufficient space around the ventilator.
(3) Confirmation by Service Engineer
1. Check the main unit fan is operating. If not, inside temperature rises, causing it impossible to keep the
detector at 15qC.
2. If the cooling fan is failed, the temperature cannot be kept at 15qC.
Suspect Part Test Points Expected Value
Temperature sensor Temperature sensor connector pin 1 (green)
and pin 3 (black) (GND)
+5 V
Temperature sensor connector pin 2 (white)
and pin 3 (black) (GND)
0.10 V to 0.20 V
CN115 (PCB No. 6362) pin 1 and pin 3 (GND) +5 V
CN115 (PCB No. 6362) pin 2 and pin 3 (GND) approx. 0.15 V
(cooler temp. (C°) x
0.01 V ± 0.02 V)
Pertier Pertier connector pin 1 and pin 2 12 V ±10%
3. When the voltage between pin 4 and 5 of CN8 (PCB No. 4086) shows 12 V, the harness of Peltier
heater unit is failed. Otherwise, the PCB No. 4086 is failed.
CA-500 Series S/M 6-5 Revised December 2001 8
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