Lexicon MPX 110 - Page 6

MPX 110 Service Manual
ADC Pot Test (7).......................................................................................................................5-11
EEPROM Checksum (8).............................................................................................................5-12
MIDI Tests (9)............................................................................................................................5-13
LED Test (10)............................................................................................................................5-14
Lexichip3 External DRAM Test (11).............................................................................................5-14
Burn In Loop (12).......................................................................................................................5-15
Audio I/O (13)............................................................................................................................5-16
Exit Diagnostics (14) ..................................................................................................................5-16
Initialize (15)..............................................................................................................................5-16
Restoring Factory Settings.............................................................................................................5-16
Disassembly/Reassembly..............................................................................................................5-17
Disassemby...............................................................................................................................5-17
Reassembly ..............................................................................................................................5-17
Removal and installation of components......................................................................................5-17
Chapter 6 Theory of Operation......................................................................6-1
Sheet 1:..........................................................................................................................................6-1
Input Stage..................................................................................................................................6-1
Output Stage...............................................................................................................................6-1
Sheet 2...........................................................................................................................................6-2
Single-ended to differential converter ............................................................................................6-2
AK4528 CODEC..........................................................................................................................6-2
Differential to Single-Ended Output Amplifiers................................................................................6-3
Sheet 3...........................................................................................................................................6-3
L3 Initialization.............................................................................................................................6-3
Audio Memory .............................................................................................................................6-4
Master Clock Generator...............................................................................................................6-4
I/O..............................................................................................................................................6-4
SEEPROM..................................................................................................................................6-4
Z80 Memory Management............................................................................................................6-5
Clocks.........................................................................................................................................6-5
DSP............................................................................................................................................6-5
Z80 RESET.................................................................................................................................6-5
Sheet 5...........................................................................................................................................6-6
Encoders.....................................................................................................................................6-6
Sheet 6...........................................................................................................................................6-6
Control Input (IAD).......................................................................................................................6-6
Sheet 7:..........................................................................................................................................6-6
Footswitch...................................................................................................................................6-6
LED/Switch Matrix........................................................................................................................6-6
Sheet 8:..........................................................................................................................................6-7
Power Fail/Reset .........................................................................................................................6-7
MIDI I/O......................................................................................................................................6-7
S/PDIF Out..................................................................................................................................6-7
Chapter 7 Parts List........................................................................................7-1
MPX110 MAIN BOARD ASSEMBLY.................................................................................................7-1
MPX110 MECHANICAL ASSEMBLY................................................................................................7-2
MPX110 SHIP/PACKAGING MATERIAL...........................................................................................7-3
MPX110 TRANSFORMER OPTIONS...............................................................................................7-3
Chapter 8 Schematics and Drawings............................................................8-1
Schematics:....................................................................................................................................8-1
Drawings: .......................................................................................................................................8-1