Lexicon MPX 500 Service Manual page 6

MPX 500 Service Manual
Footswitches: ....................................................................................................................................5-5
Front Panel Switches: .......................................................................................................................5-6
#9 Encoder Test:...............................................................................................................................5-6
#10 MIDI Test:...................................................................................................................................5-7
#11 LCD Test: ...................................................................................................................................5-7
#12 Exit Test: ....................................................................................................................................5-7
#13 Initialize Test: .............................................................................................................................5-7
#14 Unused:......................................................................................................................................5-7
#15 Unused:......................................................................................................................................5-7
#16 Burn In Test:...............................................................................................................................5-7
General Troubleshooting and Service Notes............................................................................................5-8
Power Supply........................................................................................................................................5-8
Front Panel Knobs ................................................................................................................................5-8
Lexichip Replacement ..........................................................................................................................5-8
Chapter 6 Theory of Operation ................................................................... 6-1
Schematic walkthrough ............................................................................................................................6-1
Sheet 1 (INPUT) ...................................................................................................................................6-1
Sheet 2 (DAC) ......................................................................................................................................6-1
Sheet 3 (LEXICHIP3, ROM/RAM, uPROC) ..........................................................................................6-1
Sheet 4 (ENCODERS)..........................................................................................................................6-2
Sheet 5 (MIDI, DIGITAL AUDIO OUT)..................................................................................................6-2
Sheet 6 (DISPLAY DRIVER) ................................................................................................................6-3
Sheet 7 (POWER SUPPLY) .................................................................................................................6-3
Additional Sheets 1 each (SW#1, SW#2) .............................................................................................6-3
Chapter 7 - Parts List.................................................................................. 7-1
Chapter 8 Schematics and Drawings ......................................................... 8-1