Digitus Biometrics dbNEXII, User Manual

Page: 26 / 27

Digitus Biometrics, Inc.
User Manual - Models: dbNEXII, dbNEXIII, dbSAI, dbTRI
Page 26 of 27
Problem
When you power the Control Unit up you hear the buzzer sound for 1 second, the
buzzer turns off and them immediately turns back on and stays on.
Solution
One of 3 conditions can cause this:
1.) The Tamper Circuit on the Head Unit is open. This can be because the switch
inside the Head Unit isn't properly closed, or because there is a wiring problem
between the Control Unit and the Head Unit.
Check the Head Unit is correctly screwed together.
Check the switch lever on the PCB inside the Head Unit (labeled SW1) isn't
damaged.
Check that the cable connecting the Head Unit to the Control Unit isn't interfering
with the switch lever.
There may be a wiring problem between the Head Unit and Control Unit. Check
the cable that connects the Head and Control Units together. Ensure the cable is
wired "straight-thru", i.e. Terminal A on the Head is connected to terminal A on
the Control Unit, terminal B is connected to terminal B, etc. The 2 wires that are
used for the tamper circuit are terminals G and H.
2.) The Door Sensor Circuit is open.
Refer to the Door Sensor section of the Installation Manual.
Ensure that the Jumpers are set correctly, according to the type of sensor being
used.
If a door sensor is not being used, ensure that the Door Sensor inputs (labeled
OPEN and GND) on the DOOR connector are connected together (refer to
Installation Manual).
3.) The Normally Closed Fire Circuit is open.
Refer to the Fire Panel Integration section of the Installation Manual.
If a normally closed fire circuit is not being used, ensure that the terminals
labeled GND and NC on the FIRE connector are connected together (refer to
Installation Manual).
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Problem
When you power the Control Unit up you hear the door relay click open and stay
open.