Lexicon
4-9
3. Press the Yes button twice. The display reads: Devel DSP Bypass On 1. Turn the knob CCW to turn
the DSP circuit to Byp 0.
4. Press the Yes button 21 times. The display reads: Devel Gtone. Turn the knob and set the level to Byp
0.
5. Press the No button 4 times. The display reads: Devel Bass. Turn the knob and set the level to 0.
6. Press the Yes button once. The display reads: Devel Trebl. Turn the knob and set the level to 0.
7. Press the Yes button 6 times the display reads: Devel Gain Byp 0. Turn the knob CW to turn the Gain
circuit On 1.
8. Press the Edit button 3 times. The display reads: Edit Select Mix.
Signal Level:
1. Apply a 1kHz-sinewave signal at -5.5dBu (411 mVRMS).
2. Set the Analyzer for a 0dB reference (@ 1kHz).
3. Verify an output level reading between 10.7 to 11.76dBu (2.7 to 3.0 Vrms).
4. Press the System button. The display reads: Devel Gain On 1.
5. Press the No button 9 times until the display reads: Devel Drive 0. Turn the knob CW to set the Drive
level to 60.
6. Apply a 1kHz-sinewave signal at -70.5dBu (231 mVRMS).
7. Set the Analyzer for a 0dB reference (@ 1kHz).
8. Verify an output level reading between 4.4 to 2.2dBu (1.3 to 1.0 Vrms).
9. Turn the knob CCW and set the Drive level to 0.
10. Press the Yes button 4 times. The display reads: Devel M-Vol 42 Turn the knob CCW to set the Volume
level to -60.
11. Apply a 1kHz-sinewave signal at -10.5dBu (231 mVRMS).
12. Set the Analyzer for a 0dB reference (@ 1kHz).
13. Verify an output level reading between -54.34 to -55.46 dBu (1.5 to 1.3 mVRMS).
14. Turn the knob CW and set the Drive M-Vol to -14.
15. Press the Yes button 3 times. The display reads: Devel FGood Out 0. Turn the knob CW so the setting
is In 1. This will engage the Feel Good circuit.
16. Press the No button 7 times. The display reads: Devel Drive 0. Turn the knob CW for a setting of 10.
17. Press the No button once. The display reads: Devel Feel 0. Turn the knob CW for a setting of 8.
Note: In the following part of this test an oscillator with a tone burst function must be set for the specs below
in step 18. The resulting output from the MPX G2 must be feed to a storage oscilloscope that is capable of
measuring and storing the information in time domain as indicated in the 2 graphs below.
18. Apply a 1kHz-sinewave signal Burst at -6dBu (388 mVRMS).
19. Set the Analyzer for a 0dB reference (@ 1kHz).
20. The tone burst is measured in a time domain. Measure the positive peak amplitude at various times
during the test from (0-28ms). The waveform measurement should look like the following signal in the
figure below. Notice that the amplitude of each peak in the burst decreases over time.
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