Black Box ACU8000A, Manual

724-746-5500  |   blackbox.com 

17 

ServSwitch Universal Extender 

17 

4.2 

Receiver Unit Front-Panel Controls and Indicators 

 
 
 
 
 
 
The receiver unit can be operated in two different modes: RUN mode and CAL (calibrate) 

mode. In the run-mode, all LEDs and buttons for video adjust are off. In CAL mode, the unit 

should turn on the specific video adjust LEDs to indicate the previous selection in this mode, 

such as channel selection A or B, HF gain, or align mode.   
There are two ways to get into the calibrate-mode to adjust the video. The first and 

recommended method is to use the 

VIDEO ADJUST

 switch on the sender unit and set it to 

CAL, which puts the receiver unit in the calibrate mode and also activates a test pattern. The 

receiver unit stays in this calibrate mode until the 

VIDEO ADJUST

 switch is set back to RUN. 

The other way to enter the calibrate mode is to hold down the 

SELECT

 button for three 

seconds at the receiver unit; in this case, the test pattern will not be displayed as output.  If 

there is no user activity on the front panel for one minute, the receiver unit will time out and 

switch back to the RUN mode.   

NOTE:

You can use the 

VIDEO ADJUST

 switch on the sender unit to quickly put the receiver unit in 

the calibrate-mode (Video Adjust LEDs on the receiver unit front panel are lit). The sender unit 

also generates a test pattern that is specifically designed for Video Calibration.  
The 

CHANNEL SELECT

 button is used to select either video A or video B input source to 

adjust. The setting for Ch A and B are independent and hence the procedure must be 

repeated for each of the two video screens. 
The 

UP

 and 

DN

 buttons are used to adjust either the high-frequency compensation (HF 

GAIN) or the red, green, and blue signal alignment (ALIGN).  Press the 

UP

 or 

DN

 button once 

to increase or decrease the gain level. When holding down either the 

UP

 or 

DN

 button, the 

unit will automatically increase or decrease the gain level until it reaches the maximum or the 

minimum gain level setting. The RED, GRN, and BLU LEDs will flash when the unit’s gain 

level is at minimum or maximum. The 

UP

 and 

DN

 buttons can also be used to reset the HF 

Gain or the signal alignment. Just press them simultaneously.   
The 

SELECT

 button is used to select either the signal alignment (ALIGN) or the high-

frequency gain (HF GAIN) adjustment.

Figure 4-2  Controls and indicators on the receiver unit’s front panel 

Up & Down 

Buttons 

Channel 

Select Button 

Select Button