Lexichip3 Adf Test (5); Dram Test (7); Switch Test (8) - Lexicon MPX 200 Service Manual

MPX 200 Service Manual
3. Using the ¼" phone cable, connect one end to the ¼" jack marked footswitch on the back of the
MPX200.
4. Connect the other end ¼" phone cable to the ¼" phone jack on the footswitch.
5. Using the appropriate power cord, connect the MPX 200 to an appropriate AC voltage source.
6. Set the MPX 200 into Extended Diagnostics mode to perform the following functional tests by turning
the power switch to the ON position while holding down the Bypass button.
7. Release the "Bypass" button when the Green LEVEL –30dB LED's are lit (after approximately 3
seconds).
Note: When the tests are loaded a small ( r ) will appear in the display. This indicates that the test is
running. When the tests are actually performed, two other characters will appear, a ( P ) will indicate the
test preformed has passed, and a ( f ) will indicate the test has failed. After some of the tests, when the load
button is pressed and released, the displays will read ( d ) to indicate that the test has been exited.

Lexichip3 ADF Test (5)

1. Turn the encoder knob clockwise until the 7-segment display reads: " 5 ".
2. Press and release the Load button to execute the test.
3. Observe that the display reads: "P5" and that the (Green) LEVEL -30dB LEDs will light.

DRAM Test (7)

1. Turn the encoder knob clockwise until the 7-segment display reads: " 7 ".
2. Press and release the Load button to execute the test.
3. Observe that the display reads: "P7" and that the (Green) LEVEL -30dB LEDs will light

Switch Test (8)

1. Turn the encoder knob clockwise until the display reads " 8 ".
2. Press and release the load button to execute the test.
3. The display will read: "r 8".
4. The MPX 200 is now ready to test both the footswitch functions and the front panel switches.
Footswitches
1. Press and hold the Left footswitch (labeled Ring) and observe that the Left –30dB headroom LED is lit.
2. Release the Left footswitch and observe that the Left –30dB headroom LED has turned off.
3. Press and hold the Right footswitch (labeled Tip) and observe that the Right –30dB headroom LED is
lit.
4. Release the Right footswitch and observe that the Right –30dB headroom LED has turned off.
Front Panel Switches
1. Press and hold the Edit button and observe that the Edit LED is lit.
2. Release the Edit button and observe that the Edit LED has turned off.
3. Press and hold the Store button and observe that the Store LED is lit.
4. Release the Store button and observe that the Store LED has turned off.
5. Press and hold the Tap/Cancel button and observe that the Tap/Cancel LED is lit.
6. Release the Tap/Cancel button and observe that the Tap/Cancel LED has turned off.
7. Press and hold the Bypass button and observe that the Bypass LED is lit.
8. Release the Bypass button and observe that the Bypass LED has turned off.
9. Press and hold the Compressor button and observe that the Compressor LED is lit.
10. Release the Compressor button and observe that the Compressor LED has turned off.
11. Press and hold the Load button and observe that the Load LED is lit.
12. Release the Load button and observe that the Load LED has turned off.
13. Observe that the 7-segment display reads: "d 8".
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