MPX 500 Service Manual
4-4
Listening Test:
Setup
1. Connect an audio cable between the output of the Low Distortion Amplifier and the MPX 500 Left and
Right Inputs.
2. Connect two audio cables between the headphone amplifier inputs and the MPX 500 Left and Right
outputs.
3. Set the headphone amplifier volume control to its lowest level.
4. Set the oscillator for 220Hz sinewave at 100mVrms.
5. Power on the MPX 500 and turn the program knob to the # 1 program Small Plate
Verify Clean Audio
1. Load Program # 1 Small Plate.
2. Set the reverb time to 2.04 seconds or greater, the Mix to 100% and Bypass to Off.
3. Put on headphones and set the headphone amplifier volume to a comfortable listening level.
4. Sweep the input knob over the entire range and verify that no pops, clicks, distortion, or static noises
are heard when turning the knob.
Shock Test
1. Lift one side of the MPX 500 four inches off the work surface and drop
2. Verify that no audio or display intermittence is caused by this action.
NOTE: To prevent damaging the unit, keep one side of the unit touching the work surface at all times.
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