
Chapter 4 Troubleshooting
The following table summarizes the LED display detail.
Table 4-4 Alarm LED Detail
LED
Description
PWR |
| Goes on when the device is powered on. | |
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| Blinks in green when the device ready for operation and stays on when the device runs in | |
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| operation state. | |
RDY |
| This LED also blinks in orange when the device is ready for maintenance mode, which | |
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| can be entered by turning on the power while holding down the MNT button, and stays on | |
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| in orange when the device runs in maintenance mode. | |
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| Remains off during normal operation, and goes on in orange when input signals are | |
IN DWN | interrupted. LED also blinks when | ||
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| It blinks for 10 seconds also when the statistics input error counter is incremented. | |
ALM |
| Alarm LED, which blinks or goes on when a device alarm occurs. For conditions of | |
| whether it blinks or goes on, see Table | ||
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DEC |
| Goes on in green during decoding. This LED stays off when decoding is not being performed. | |
| It blinks in green when a decoding error occurs. (*1) | ||
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OPT |
| Lights in green when the HD upgrade option is installed. (*2) | |
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*1: | Only for the |
*2: Only for the