6.5.5 Probe Crash
Monitor Timing: When the probe descends
Monitor Method: Micro switch incorporated in the probe holder monitors Probe crash.
CA-500’s Action: Emergency stop
(1) Probable Cause
1. Reagent is absent or insufficient in reaction tube or sampler cup in reagent rack, or in sampler cup.
Plasma sample is absent or insufficient in reaction tube, or sampler cup in reagent rack, or in sampler
cup.
2. Probe is obstructed to descend.
3. Mis-positioned probe
4. Failure of probe
5. Failure of PCB No. 9264
6. Failure of PCB No. 2134
7. Failure of Y-Z relay harness
8. Failure of PCB No. 9260
9. Failure of X axis wiring cord
10. Failure of wiring cord (flat cable)
11. Failure of PCB No. 6362
(2) Confirmation by the operator
1. Place reagent and sample in required amounts.
2. Remove anything that is obstructing the operation.
(3) Confirmation by Service Engineer
1. When probe crash has actually occurred,
a) Correct mis-positioning if it is the case.
b) Confirm probe position for reagent, sample, and reaction tube.
2. When Probe Crash appears even no crash has occurred, or for an unstable situation, confirm the
following:
a) Slide the probe up and down in the probe holder. If this improves the situation, the probe holder
assembly might have a trouble.
Suspect Part Test Points Expected Value
Probe Crash Sensor CN5 (PCB No. 2134) pin 1 (GND) and pin 2 5 V Æ 0 V when probe crash occurs
CN1 (PCB No. 2134) pin 16 (GND) and pin 7 5 V Æ 0 V when probe crash occurs
CN1 (PCB No. 9260) pin 16 (GND) and pin 7 5 V Æ 0 V when probe crash occurs
CN105 (PCB No. 6362) pin 13 (GND) and pin
4
5 V Æ 0 V when probe crash occurs
* PCB No. 2134 latches Crash signal each time. So, confirm the above by pressing the liquid level sensor
reset switch in the service mode.
CA-500 Series S/M 6-18 Revised December 2001 8
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