Lexicon 200, Service Manual

Page: 15 / 90

Lexicon
4-3
Encoder Test (9)
1. Turn the encoder knob clockwise until the 7-segment display reads: “ 9 ”.
2. Press and Release the Load button to execute the test.
3. Observe that the 7-segment display reads: “r 9”.
4. Turn the encoder one revolution in a clockwise direction one position at time. The display should
indicate the current position of the encoder from 0-15.
5. When the test is complete the display will read: “P 9”.
MIDI Test (10)
4. Turn the encoder knob clockwise until the 7-segment display reads: “ 10”.
5. Press and release the Load button to execute the test.
6. Observe that the display reads: “P10”.
LED Test (11)
1. Turn the encoder knob clockwise until the 7-segment display reads: “ 11”.
2. Press and release the Load button to execute the test.
3. Observe that all of the front panel's LEDs are lit and that the segments on the 7-segment displays are
all off.
4. Observe that the colors of the LEDs are correct as shown below:
LEVEL COMPRESSOR EFFECTS ROUTING (DUAL) EDIT
L R YEL
RED
GRN GRN GRN GRN
RED
(Load) (Compressor) (Edit)
RED RED
RED
GRN
GRN GRN GRN GRN RED
GRN RED YEL
GRN GRN
RED
GRN
GRN GRN GRN GRN RED
GRN GRN GRN
GRN GRN
RED
GRN
GRN GRN GRN GRN RED
(Edit)
(Store) (Tap/Cancel)
Clip
-12dB
-30dB
Threshold
-3dB
-10dB
-20dB
Compressor
Chamber
Gate
Echo/Delay
Plate
Room
Flange
Rotry/Trmlo
Hall
Ambience
Chorus
Pitch/Detune
C
C
C
C
Mix
Adjust
EQ
Lvl/Bal
Ratio
Threshold
Attack
Release
5. Turn the encoder knob clockwise one position.
6. Verify that all of the front panel's LEDs turn off and that the 7-segment display reads “8.8.8” as shown
below:
NOTE: All of the segments on the 7-segment displays should be lit except the rightmost decimal point.
7. Turn the encoder knob clockwise one position.
8. The display should read: “r11” and the Left Green LEVEL –30dB LED should be lit.
9. Turning the encoder knob clockwise one position at a time, observe that that each of the remaining
front panel's LEDs, as well as the segments on the 7-segment displays, can be lit individually.
10. Press and release the Load button to exit the test.
11. The display will momentarily read: “d11”, then display: “12”.
EXIT Test (12)
1. Turn the encoder knob clockwise until the 7-segment display reads " 12 ".
2. Press and release the Load button to execute the test.
3. The displays should read: “ 1” and jump into normal operating mode.
4. Set the power switch to the OFF position to power off the MPX 200.
5. Disconnect all cables from the rear panel of the MPX 200.
I/O Test
These tests will verify the audio performance of the MPX 200’s audio input and output circuitry.