6.6.3 Replace Sample Rack Drawer
Monitor Timing: When starting analysis
Monitor Method: Photo interrupter incorporated is shaded by the light shield attached to the sample rack
drawer.
CA-500’s Action: Warning is displayed and no analysis is performed.
(1) Probable Cause
1. The sample rack drawer is removed.
2. The sample rack drawer is not properly mounted.
3. Defective light shield of sample rack drawer.
4. Failure of photo interrupter sensor
5. Failure of solenoid valve assembly
6. Failure of PCB No. 6362
(2) Confirmation by the operator
1. Place the sample rack drawer properly.
2. Remove any foreign matters.
(3) Confirmation By Service Engineer
1. Check the dirt on table rock mechanism and/or it is free from foreign matters.
2. Check whether the light shield is damaged or not on the sample rack drawer rear side.
3. 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.
4. If the above step 3 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 6-22 Revised December 2001 8
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