Denso CU-7011 - Manual (Page 13)

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Chapter 4 CU Status Indication by
LED Indicators
According to the ON/OFF states of the POWER and DATA LED indicators, you may
check the machine status of the CU-7011 as listed below.
POWER DATA Machine status
OFF OFF Power off
ON OFF Power on
ON ON Communicating with the host
Flashing slowly* 1 ON Updating the CU system program
Flashing slowly Flashing* 2 Waiting for retry after occurrence of a
CU system program updating error
Flashing slowly Flashing slowly System program failure
Solution: Contact your nearest dealer.
Flashing quickly* 3 Flashing quickly System program error
Solution: Restart the CU-7011. If this
error occurs frequently, contact your
nearest dealer.
* 1 At one-second intervals
* 2 At 100-ms intervals
* 3 At 50-ms intervals