Chapter 4 Performance Verification; Initial Inspection; Functional Tests; Analog Input Test - Lexicon MC-1 Service Manual

Chapter 4 Perfo r mance Verification
This section describes a quick verification of the operation of the MC-1 and the integrity of its analog and
digital audio signal paths.

Initial Inspection:

1. Check each front panel switch for smooth mechanical operation and verify that the display
acknowledges its functions.
2. Verify that all of the front panel LEDs light at power up.
3. Check all the buttons on the remote and verify that the display is responding to all the remote
commands.

Functional Tests:

Analog Input Test

Setup
1. Connect the oscillator outputs to the Left and Right inputs of the VCR input on the rear panel of the MC-
1
2. Connect the MC-1 Left and Right Front audio outputs to the amplifier Left and Right inputs and the
outputs of the amplifier to a pair of speakers.
3. Put the MC-1 into its Extended Diagnostics mode by applying power to the MC-1 while pressing and
holding down both the front panel REC/ZONE2 and EFFECT ▼ buttons until Extended Diagnostics
appears on the display.
4. Press the TAPE button on the remote to select Audio Test.
5. Press the VCR button on the remote. AUDIO Test 13 will appear in the display which confirms the VCR
input is connected to all 8 audio outputs of the MC-1.
6. Slowly increase the volume on the amplifier to a comfortable listening level for the speaker .
7. Sweep the oscillator from 20Hz to 20kHZ you should hear clean audio coming from both speakers.
8. Power off the amplifier and move the cables from the Front Left / Right outputs to the Center left and
Subwoofer right outputs. Repeat the oscillator sweep again checking for clean audio from the speakers.
Repeat this step for the remaining outputs on the MC-1.
9. In order to test the remaining MC-1 inputs, power off the amplifier and the MC-1. Reconnect the MC-1
Front Left / Right outputs to the amplifier.
10. Move the cables from the MC-1 VCR Left / Right inputs to the DVD Left / Right inputs.
11. Press the DVD button on the remote. The display will read AUDIO Test 12, which will confirm the DVD
input is connected to all 8 audio outputs of the MC-1.
12. Repeat steps 6 to 8 above for the DVD input. When done repeat the test for the remaining inputs.
13. The following ID#s will confirm which inputs you have selected for test.
VCR: 13 DVD: 12
AUX: 0F CD: 0E
14. Press and hold the Shift button on the remote then press the Done button once. This will place the MC-
1 at the top of the Extended Diagnostics Menu. Releasing the Shift button and then pressing the DONE
button one more time will then cause the MC-1 to exit the Extended Diagnostics and drop into normal
operation.
Listening Test
1. Power up the MC-1 in normal operating mode.
2. Connect a music source to the Left / Right VCR audio inputs of the MC-1.
3. Press "PARTY" on the remote control.
V-DISC: 11 TV: 10
TUNER: 0D TAPE: 0C
Lexicon
4-1