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When the program has started successfully, and the ‘Ready to connect’ message is visible no further action
is necessary. The Nortek engineer can now connect to your computer and try to solve your problem.
10.2 Communication
The blue LED indicator light on the instrument is not lit
•
Is the instrument in Command mode?
•
Does the LED blink (short) when applying power?
10.2.1 Cable
Cables are often exposed to heavy use and the power connector might break. Using a multimeter to ping
through each pin may reveal a breakage.
10.3 Power
10.3.1 Interface does not switch on
First check the status of the fuses on the rear:
Inspect the fuses, or measure them using a multimeter. Replace if necessary. Both fuses are 5x20 mm glass
fuses, 1.6A, Slow Blow.
10.3.2 Power to the Signature sensor
The Signature is powered from the 48 V power supply in the interface box. The exact same power line is
used for the ‘Power LED’ on the front panel, so if this is LED is lit, there is power. Just above the power
connector on the rear is a fuse, which is a 3.15 A, slow blow.
Figure 10 Mains Fuses
