6.2.4 Temperature Error (High)/Room, Temperature Error (Low)/Room
Monitor Timing: When READY: 1-minute interval
During analysis: No monitoring
Monitor Method: A/D converter reads the thermal sensor data installed at the upper fan motor as follows:
Temperature error when exceeds the range 10.0 - 40.0qC.
(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.
4. Failure of PCB No. 6362
5. Failure of main 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.
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)
approx. 0.25 V
(room temperature x
0.01 V ± 0.02 V)
CN115 (PCB No. 6362) pin 7 and pin 9 (GND) +5 V
CN115 (PCB No. 6362) pin 8 and pin 9 (GND) approx. 0.25 V
(room temperature x
0.01 V ± 0.02 V)
6.2.5 Temp. Sensor Error/(Position)
Monitor Timing: Everytime
Monitor Method: Error is monitored by I/F (ACK/BUSY) signal time out with temperature control CPU on
PCB No. 6362 or PCB No. 6373 and Main CPU.
CA-500’s Action: Warning
(1) Probable Cause
1. Failure of PCB No. 6362
(2) Confirmation by the Operator
1. Confirm temperature by checking temperature displayed on the main unit.
(3) Confirmation by Service Engineer
1. Confirm temperature by checking temperature displayed on the main unit.
2. When the temperature is not displayed or 99.9 °C is displayed, the PCB No. 6362 is failed.
CA-500 Series S/M 6-6 Revised December 2001 8
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