6.6.6 Change Sample Rack
Monitor Timing: Monitor every 50 msec during interruption
Monitor Method: 1. The micro switch in the sample rack table.
2. Photo interrupter incorporated is shaded by the light shield attached to the sample rack
drawer.
CA-500’s Action: Warning at each analysis.
(1) Probable Cause
1. The sampler rack is not replaced.
2. Failure of sampler rack sensor assembly
3. Failure of wiring cord (wiring cord with spiral)
4. The sample rack drawer is not opened or closed.
5. Defective light shield of sample rack drawer.
6. Failure of sensor
7. Failure of solenoid valve assembly
8. Failure of PCB No. 6362
(2) Confirmation by the operator
1. Place the sampler rack properly.
2. Place the sampler rack drawer properly.
(3) Confirmation by Service Engineer
1. Check the dirt on sample rack table and/or it is free of foreign matters.
2. Short-circuit the pin 20 and pin 18 of relay connector. If it can be monitored on the switch sensor
screen, the sample rack drawer might be faulty. Check the harness and sample rack sensor.
3. If the above step 2 does not solve the trouble, short-circuit the pin 14 and pin 12 of CN111 on PCB No.
6362. If this solves the trouble, the wiring cord (wiring cord with spiral) is faulty. If not, the PCB No.
6362 is faulty.
4. Check whether the light shield is damaged or not on the sample rack drawer rear side.
5. If the signal on the pin 2 and pin 3 of the relay connector for solenoid assembly does not change even
photo interrupter is shaded by the light shield, the solenoid valve assembly or sensor is faulty.
6. If the above step 5 does not solve the trouble, short-circuit the pin 5 and pin 6 of CN112 on PCB No.
6362. If this solves the trouble, the wiring cord (wiring cord from CN19 on PCB No. 4086) is faulty. If
not, the PCB No. 6362 is faulty.
CA-500 Series S/M 6-24 Revised December 2001 8
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