6.11.2 Turned Off During Operation
Monitor Timing: At the time when the power is turned ON
Monitor Method:
CA-500’s Action: Warning
(1) Probable Cause
1. AC power supply failed.
2. Fuse was burned.
(2) Confirmation by the operator
1. Check the AC power supply connection and fuse.
(3) Confirmation by Service Engineer
1. Check each unit carefully if the fuse is burned frequently.
6.11.3 Light Shield Open
Monitor Timing: At time of analysis start, during analysis, and rising mode.
Monitor Method: Photo interrupter monitors the light shield cover is open or closed by the light shield.
CA-500’s Action: Emergency stop
(1) Probable Cause
1. The light shield cover is opened intentionally.
2. Foreign matters such as dirt and others on the sensor
3. Failure of the cover switch sensor
4. Failure of wiring cord (wiring cord from CN19 on PCB No. 4086)
5. Failure of PCB No. 6362
(2) Confirmation by the operator
1. Remove the foreign objects on the sensor section.
(3) Confirmation by Service Engineer
Suspect Part Test Points Expected Value
Switch Sensor Relay connector pin 2 and pin 1 5 V
Relay connector pin 2 and pin 3 0 V
PCB No. 9265 CN112 (PCB No. 6362) pin 8 and pin 9 0 V, when light shield cover is CLOSED
5 V ± 0.25 V, when light shield cover is
OPEN
Wiring Cord
(wiring cord from CN19
or PCB No. 4086)
CN112 (PCB No. 6362) pin 8 and pin 9 Does not change the signal when light
shield is OPEN or CLOSED
CA-500 Series S/M 6-37 Revised December 2001 8
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