6.5.6 Syringe Error
Monitor Timing: When sensing home position during operation
Monitor Method: Photo interrupter is shaded by the light shield to drive mechanism.
CA-500’s Action: Emergency stop
(1) Probable Cause
1. The motion of drive mechanism is obstructed.
2. Loosened pulley of motor.
3. Failure of home position detection sensor
4. Defective light shield
5. Flaws on shaft
6. Failure of bushing
7. Failure of PCB No. 9265
8. Failure of wiring cord (wiring cord from CN19 on PCB No. 4086)
9. Failure of PCB No. 6362
10. Failure of syringe motor
11. Failure of wiring cord (printer relay flat cable)
12. Failure of PCB No. 4086
(2) Confirmation by the operator
None
(3) Confirmation by Service Engineer
1. Retighten the pulley of motor if it is loosened.
2. When home position cannot be sensed even if the drive mechanism is functioned:
a) Check the light shield plate is broken or not.
b) If 5 V is not appeared the pin 2 and pin 1 of CN112 for PCB No. 6362, or if the signal on the pin 2 and
pin 3 changes from 5 V to 0 V when the sensor is shielded, the PCB No. 6362 is faulty. If 5 V ± 0.25
V is appeared on the pin 2 and pin 1 and the signal on the pin 2 and pin 3 does not change, the wiring
cord (wiring cord from CN19 on PCB No. 4086) or the sensor is faulty.
3. When the motor does not run:
a) Any of motor, PCB No. 9265, wiring cord (printer relay flat cable), and PCB No. 4086 is faulty.
Replace and confirm.
b) Turn the pulley by hand. If it does not move, the motor or drive mechanism is faulty.
4. Failure of the drive mechanism
a) Check for flaws on the shaft.
b) If the axis is free from flaws, check the bushing is all right or not.
c) Check the piston No. 28 is broken or not.
CA-500 Series S/M 6-19 Revised December 2001 8
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