User guide

AMP2A-10S User Guide

Level Meter Bar Graph Fine Adjustment

Level Meter Bar Graph Fine

Adjustment

1. To remove the top cover, remove the top cover screws (2 along

upper front panel, 2 per each side, 3 along upper rear panel, and

1 center top). The 919030 PCBs (2 each) are vertically mounted to

the chassis bottom just behind the front panel-mounted LED bar

graph displays, one for each bar graph.

2. To adjust the pot locations and functions, locate P1 on the 919030

bar graph driver PCB(s) you wish to adjust. The P1 trim pot faces

upward from the PCB edge. Of the two trim pots visible (P1 and

P2) it is the closest to the front panel as mounted to the chassis.

3. Connect an analog audio signal of an amplitude of approximately

1 kHz of the amplitude desired to give a “0” indication on the bar

graph to the input of the bar graph you wish to adjust.

4. Turning the P1 pot clockwise increases the displayed level

(sensitivity) of the associated bar graph meter. For example, to set

the zero level at +7 dBu (rather than the factory default setting of

+4 dBu), adjust the level input gain calibration DIP switches for

gain closest to that desired. Feed an analog audio signal of +7 dBu

amplitude (as in Step 3) into the input on the rear panel, then turn

the pots counter-clockwise as you visually monitor the associated

bar graph meter on the front panel until the desired display setting

(“0”) is achieved for the increased input level. To zero the meters

for a lower input level, you would turn the pots clockwise to

increase the displayed level for any decreased input level.

Level Meter Bar Graph Peak LED

Segment Adjustment

1. Remove the top cover screws (2 along upper front panel, 2 per

each side, 3 along upper rear panel, and 1 center top). The 919030

PCBs (2 each) are vertically mounted to chassis bottom just behind

the front panel mounted LED bar graph displays; one for each bar

graph.