6.4.4 Z Axis Down Error
Monitor Timing: When reaction tube is caught and released
Monitor Method: Monitoring the tube detection condition.
CA-500’s Action: Emergency stop
(1) Probable Cause
1. Drive mechanism operation is obstructed.
2. Loosened pulley of motor
3. Failure of PCB No. 9264
4. Failure of PCB No. 2134
5. Defective light shield
6. Flaws on shaft
7. Failure on bushing
8. Failure of PCB No. 9260
9. Failure of wiring cord (flat cable)
10. Failure of PCB No. 6362
11. Failure of Z axis motor assembly
12. Failure of PCB No. 4086
13. The light shield attached to the catcher is mis-positioned or defective.
(2) Confirmation by the Operator
1. Remove the reaction tube.
2. Remove the obstruction in Z-axis drive mechanism.
3. Turn off the power supply and turn it on again.
(3) Confirmation by Service Engineer
1. Retighten the screw of the pulley of motor.
2. If home position cannot be detected even when the drive mechanism is operated:
a) Check whether the light shield is defective or not.
Suspect Part Test Points Expected Value
Position sensor CN1 (PCB No. 9264) pin 9 (GND) and pin 7 5 V Æ 0 V when the
sensor is shielded
CN4 (PCB No. 2134) pin 9 (GND) and pin 7 5 V Æ 0 V when the
sensor is shielded
CN1 (PCB No. 2134) pin 17 and pin 18 (GND) 5 V Æ 0 V when the
sensor is shielded
CN1 (PCB No. 9260) pin 17 and pin 18 (GND) 5 V Æ 0 V when the
sensor is shielded
CN105 (PCB No. 6332) pin 7 and pin 14 (GND) 5 V Æ 0 V when the
sensor is shielded
3. When the motor does not operate,
a) Any of motor, PCB No. 9264, PCB No. 2134, X-axis wiring cord, and PCB No. 4086 is faulty.
Replace and confirm.
4. Failure of drive mechanism
a) Check for flaws on the shaft.
b) If the shaft is free from flaws, the problem is in the bushing.
CA-500 Series S/M 6-11 Revised December 2001 8
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