Service manual

3.4.9 Self-Diagnostic Functions
This model is provided with the functions that a circuit error is detected by the MPU and this error is indicated by
the LED blink frequency.
When the protector is in operation, the LED is made to blink as shown below in order to indicate the factor of
protector operation.
LED Blinking Patterns for Each Protector Operation (List of Protector Indicators)
LED condition
Protector condition
Short (0.5s) lighting frequency Long (2s) lighting frequency
HV data error 3 1
HV latch (fall) 2 1
Beam protector 5 1
Secondary power short 7
X-lay protector 1 1
(1) How to count the LED lighting frequency [Example: HV data error (3 times)]
2 sec. 0.5 sec. 0.5 sec. 0.5 sec. 2 sec.
Once Twice 3 times
(Frequency: Lighting 3 times)
Lit
Unlit
(2) Diagnostic mode and error circuit
3 times --- HV data error ------------------------- Power OFF/ON and data recovery
(HV adjustment value is destroyed or IC104 is failure).
2 times --- HV latch (falls) ----------------------- Check Item 3.4.4
5 times --- Beam protector ---------------------- Check Item 3.4.4
6 times --- Secondary power short ------------ Check Item 3.4.1
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