Lexicon MC-1, Service Manual

Page: 19 / 138

Lexicon
4-7
If the MC-1 is currently in Extended Diagnostics, turn the unit off and on to bring it back to normal running
mode.
This test will confirm the MC-1 can pass a 44.1, 48, and 96kHz digital signal to the Analog outputs.
Setup
1. Connect the output of the DVD player with the Single end of the Y-ed RCA cable.
2. Connect one RCA connector of the Y-ed cable to the (A) Expansion Port on the back of the MC-1.
3. Connect the MC-1’s Left and Right Front audio outputs to the amplifier Left and Right inputs, and turn
down the volume level control on the amplifier.
4. Connect the Left and Right outputs of the amplifier to full range speakers.
5. After the MC-1 has powered up, press and hold down the Shift button then press the 2 Channel button.
Test
1. With the audio source playing, slowly increase the volume level on the amplifier to a comfortable
listening level and verify that the outputs are free from noise, distortion, or any other anomalies.
2. The display will read the following and will indicate the frequency it is passing as well as the volume
level:
EXP PORT ## K VOL
DIRECT BYPASS -30dB
3. Pause the audio, then connect the other RCA connector on the Y-ed end to the MC-1 to the (B)
Expansion Port. Keep the (A) RCA connected to MC-1 connected to the unit.
4. Move the Front Left / Right output cables to the Center / Sub RCA connectors.
5. Press play on the audio source and again, as in step one, listen for any anomalies.
6. Pause the audio once more. Disconnect the RCA connection to the (B) Expansion Port and connect it
to the (C) Expansion Port.
7. Move the Center / Sub connectors to the Side Left / Right outputs.
8. Press play on the audio source and again, as in step one, listen for any anomalies.
9. Pause the audio once more.
10. Move the Side Left / Right output cables to the Rear Left / Right outputs.
11. Press play on the audio source and again, as in step one, listen for any anomalies.
12. The above procedure must be repeated for the remaining sample frequencies not tested.
Digital Output Test
This will confirm that the MC-1 will pass a 44.1 or 48 kHz digital signal for the S/PDIF output connector on
the back of the MC-1.
Setup
1. Connect the digital output of the CD player to the digital input Coax 1 on the back of the MC-1.
2. Connect the S/PDIF output of the MC-1 to the digital input of the DAT machine.
3. Connect the Analog Left / Right outputs of the DAT to the Analog inputs of the stereo amplifier.
4. Connect the Left / Right analog output of the amplifier to a pair of speakers.
5. Put the MC-1 into Extended Diagnostics mode by powering up the MC-1 while pressing and holding
down both the front panel REC/ZONE2 and EFFECT buttons until Extended Diagnostics appears on
the display.
6. Press the TAPE button on the remote. The display will read AUDIO Test.
7. Press and hold the Shift button on the remote, then press the Off button. The # 99 will then be
displayed next to AUDIO Test,