Black Box AC1120A User Manual

 

 

The front panel CHECK button LED starts flashing if one of the following 
conditions occurs: 

•  RTC Battery Voltage is below 2.4V 
•  +5V Supply is outside of normal operating range 4.5V – 5.5V 
•  +12V Supply is outside of normal operating range 10.8V – 13.2V 
•  System temperature is exceeding 122° F (50° C) 

 
If the battery needs changing, please contact Black Box (during the warranty 
period).  

Never open the unit’s cover. Lethal voltages exists inside the unit 
Opening the unit also voids your warranty. 

 
If there is a problem with the 12 or 5v supplies, you need to return the unit for 
repair. Please see next section. If the temperature is excessive in the unit, you 
must make sure that there is adequate air flow around the unit. 
 

Make sure that all your connections are solid, and check the state of the LED’s on 
the front of the unit. Do not open or try to repair the unit yourself. There is no 
customer repairable item in the unit and you will void your warranty. 

If you determine that your unit is malfunctioning, do not attempt to repair the unit. 
Contact Black Box Tech. Support at 724-746-5500. 

Before you do, make a record of the history of the problem. We will be able to 
provide more efficient and accurate assistance if you have a complete description, 
including: 

• The nature and duration of the problem; 
• The components involved in the problem 
• The results of any testing you’ve already done.