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Adjustment Procedures
5–22
AM700 Audio Measurement Set Service Manual
1. Observe the Spectrogram display. There should be no streaks or color smears
in the Spectrogram color legend. If there are any streaks or color smears,
adjust the associated color offset potentiometer slightly (R6 for Red, R7 for
Green, and R8 for Blue) to eliminate them.
1. In the UTILITIES front panel selections, press the Configure button.
2. Verify that the Configuration options: display has no streaks or color smears.
If any are present repeat the Fine Adjustment of the ADC Gain procedure.
3. Press the Clear Menu button to remove the Configuration options: display.
1. In the UTILITIES front panel selections press and hold in the Display
button.
2. Use the large control knob to set the Adjust brightness: level to 10%.
3. Adjust the BRT potentiometer, R24, so the backlight for the LCD display
just turns off (no visible display). (The voltage at TP1 BRIGHTNESS will
be approximately 3.5 V).
4. This completes the adjustments of the LCD Driver board.
Fine Adjustment of the
ADC Gain
Verify the Gain and Offset
Adjustments
Adjust Brightness