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MPX 500

24-Bit Dual Channel

Processor

Service
Manual

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Summary of Contents for MPX 500

Page 1: ...MPX 500 24 Bit Dual Channel Processor Service Manual ...

Page 2: ...Manual Copyright 1999 Lexicon Inc All Rights Reserved Lexicon Inc 3 Oak Park Bedford MA 01730 1441 Tel 781 280 0300 Customer Service Fax 781 280 0499 Lexicon Part 070 14399 Rev 0 Printed in the United States of America ...

Page 3: ...MPX 500 Service Manual ...

Page 4: ...MPX 500 Service Manual ...

Page 5: ...osstalk Tests 4 2 Analog In To Analog Out Crosstalk Test 4 2 Dynamic Range Tests 4 2 Analog In To Analog Out Dynamic Range Test 4 2 Digital I O Functionality 4 2 MIDI Functionality 4 3 Footswitch Functionality 4 3 Listening Test 4 4 Setup 4 4 Verify Clean Audio 4 4 Shock Test 4 4 Lexicon Audio Precision ATE Summary 4 5 Chapter 5 Troubleshooting 5 1 Check the Lexicon web site for the latest softwar...

Page 6: ...ng 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...

Page 7: ...signal source Audio Input cable balanced with shield and a XLR or plug on one end and an appropriate connector on the opposite end for connection to the Low Distortion Oscillator Audio Output cable balanced with shield and a XLR or plug on one end and an appropriate connector on the opposite end for connection to the Distortion Analyzer 1 MPX 500 Power Cord choose accordingly CORD POWER NA IEC SVT...

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Page 9: ...quipment will be accepted without Return Authorization from Lexicon If Lexicon recommends that a MPX 500 be returned for repair and you choose to return the unit to Lexicon for service Lexicon assumes no responsibility for the unit in shipment from the customer to the factory whether the unit is in or out of warranty All shipments must be well packed using the original packing materials if possibl...

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Page 11: ...20Hz 20kHz 1dB Crosstalk 96dB 1kHz THD 0 5 20Hz 20kHz Digital Audio Interface Connectors Coaxial RCA S PDIF IEC 958 CP 340 System Sample Rates Internal Clock and S PDIF Input 44 1kHz 48kHz Display 150 x 32 LCD Backlit Footswitch Tip Ring Sleeve phone jack for Bypass and Tap optional MIDI Interface Connectors IN OUT THRU System Specifications Power Requirements 90 250V 50 60Hz 12 5W 3 pin IEC Conne...

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Page 13: ...on to return to the previous running mode 5 Turn the Program Select Knob to Program 1 6 Press the Bypass button on the front panel and verify that the button LED lights 7 Connect a balanced audio cable between the Low Distortion Oscillator and the MPX 500 Left Input 8 Connect a balanced audio cable between the MPX 500 Left output and the Distortion Analyzer 9 Set the Distortion Analyzer to measure...

Page 14: ...e Analyzer 30kHz 20kHz 4 Sweep the Oscillator from 20Hz to 20kHz and verify the level to be 245mVrms throughout the sweep 5 Move the Input cable to the Right side and the Output cable to the Left and repeat step 4 Dynamic Range Tests These tests will verify the Dynamic Range specifications of the MPX 500 s Left and Right input to output circuitry Analog In To Analog Out Dynamic Range Test 1 Apply ...

Page 15: ...in Male DIN to 5 Pin Male DIN Cable also known as a MIDI cable between the MIDI IN jack and the MIDI OUT jack Press the Program Knob once to execute the test When the test is executed the LCD Display will indicate the test is Running followed by the Pass Fail status of the test To exit the test press the Program Knob Footswitch Functionality Footswitch functionality is performed through the extend...

Page 16: ...he 1 program Small Plate Verify Clean Audio 1 Load Program 1 Small Plate 2 Set the reverb time to 2 04 seconds or greater the Mix to 100 and Bypass to Off 3 Put on headphones and set the headphone amplifier volume to a comfortable listening level 4 Sweep the input knob over the entire range and verify that no pops clicks distortion or static noises are heard when turning the knob Shock Test 1 Lift...

Page 17: ...Lexicon 4 5 Lexicon Audio Precision ATE Summary ...

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Page 19: ...nt panel LEDs will be turned on for approximately 200ms and then the MPX 500 will attempt to run the following sequence of tests The tests have been designed to take less than 10 seconds ROM Test SRAM Test WCS Test INT Test ADF Test EEPROM Test Error Indication If any of the Power Up Diagnostics tests fail the LOAD LED will be turned on The error message will be displayed on the front panel as sho...

Page 20: ... value 55hex 01010101 binary then each memory location is read back to confirm it contains the 55 The memory space is then filled with AAhex 10101010 binary and the memory is read back again The final test is the memory is filled with 0 s If what is written to all locations is read back the test will pass 4 INT Test This test will verify that the Lexichip 3 interrupt INT is working and occurring a...

Page 21: ... MPX 500 When the EDIT LED is lit the BYPASS button can be released After it is released the EDIT LED will go out and the LCD Display will indicate the test number and it name The Binary testcode will be displayed on the front panel Bypass Store and Tap LEDs as was described in the Power Up Diagnostics section earlier in this chapter The following is a complete list of tests in the Extended Diagno...

Page 22: ... the LCD will display the word Running indicating that the test is working After the test has run its course a Pass Fail message will replace the Running message indicating the results of the test The EDIT LED will light if the test Passes The LOAD LED will light if the test Fails Tests 1 to 11 can be run continuously by pressing the TAP button instead of the BANK button PROGRAM knob when executin...

Page 23: ...he test will read each byte in the User Register portion of the EEPROM and add them together to calculate a checksum This value is compared with the checksum value stored in the EEPROM itself This checksum will be recalculated each time a register is stored The Second part of the test will verify that the EEPROM has been initialized properly This is done by storing the software version of the EPRO...

Page 24: ...rned off Press and hold the TAP button The TAP LED will light and the LCD Display will indicate TAP The remaining LEDs will be off When the TAP button is released the TAP LED will be turned off Press and hold the BANK button PROGRAM knob The LCD Display will indicate BANK The remaining LEDs will be off When the BANK button PROGRAM knob is released the LCD Display will indicate Done 9 Encoder Test ...

Page 25: ...through the MIDI IN jack To run this test a 5 Pin Male DIN to 5 Pin Male DIN Cable also known as a MIDI cable must be connected between the MIDI IN jack and the MIDI OUT jack When the test is executed the LCD Display will indicate the test is Running followed by the Pass Fail status of the test 11 LCD Test This test will verify all the elements of the display are working properly When the test is ...

Page 26: ...indicate the test is Running followed by the Pass Fail status of the test The following table shows the tests run in the Burn In Test Test Number Test Name Bypas s LED Store LED Tap LED LCD Display 1 ROM 0 0 1 ROM 2 SRAM 0 1 0 SRAM 3 WCS 0 1 1 WCS 4 INT 1 0 0 INT 5 ADF 1 0 1 ADF 7 DRAM 1 1 1 DRAM 0 OFF 1 ON General Troubleshooting and Service Notes Power Supply CAUTION There is no protective paper...

Page 27: ...98 at the converter input serve to reduce ailing of spectral components at the 5 to 6MHz oversampling frequency The AK5383 U17 is a 24bit 128X over sampling 2 channel A D converter configured to produce serial digital audio in I2S format For information on the AK5383 see http www akm com AKM AKMprodinfo htm Sheet 2 DAC This sheet shows the analog D A converter U11 filter and driver U7 U8 and their...

Page 28: ...ociated circuits Four bit gray code encoders SW1 SW4 are multiplexed two at a time onto a shared 8 bit bus ENC 7 0 which is readable by software Pull up resistors R124 R131 default the bus to logic high Diodes D12 D15 Program Edit 4 encoder D16 D19 Program Edit 3 encoder D20 D23 Program Edit 2 encoder D24 D27 Program Edit 1 encoder are used to isolate the output of the unselected encoder pair duri...

Page 29: ... the non active switch state to logic high FOOT_TAP and FOOT_BYPASS are fed to 74HC541 U19 which allows software to determine the footswitch state Signals ENCA and ENCB are from the two phase incremental rotary encoder on the SW1 board The encoder bits are pulled up by R86 and R87 and filtered by R85 R88 C102 and C103 Software determines the state of the encoder by reading U19 Connector J19 is the...

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Page 31: ...35 43 45 202 11347 RESSM RO 5 1 4W 3 OHM 1 00 R113 202 11683 RESSM RO 5 1 10W 5 1 OHM 1 00 R60 203 10583 RESSM RO 1 1 10W 10 0K OHM 16 00 R34 36 41 42 44 46 R51 52 61 64 70 73 R134 137 143 146 203 10896 RESSM RO 1 1 10W 1 00K OHM 8 00 R62 63 66 68 135 R136 139 141 203 11075 RESSM RO 1 1 10W 95 3 OHM 1 00 R15 203 11079 RESSM RO 1 1 10W 715 OHM 2 00 R13 14 203 11723 RESSM RO 1 1 10W 4 75K OHM 4 00 R...

Page 32: ...2060 ICSM INTER CS8412 RCVR SOIC 1 00 U14 350 12384 ICSM DRAM 1MX4 60NS SOJ 1 00 U6 350 13863 ICSM SRAM 32KX8 70NS SOIC 20uA 1 00 U2 350 14158 ICSM EEPROM 24C32 32K SER SOIC 1 00 U5 350 14175 IC ROM 27C020 MPX500 V1 04 1 00 U9 350 14176 ICSM GAL 16V8 MPX500 V1 00 1 00 U20 355 12333 ICSM DAC CS4390 24BIT STR SSOP 1 00 U11 355 13829 ICSM ADC AKM5383 24b 96kHz SOP 1 00 U17 365 09883 ICSM uPROC Z80 CM...

Page 33: ...MMSQ 250GF 2 00 SW1 2 630 14190 SPCR LED T1 2MMH 2 00 D1 2 680 14170 CABLE RIB 24 26AWG 6CX 1 3 L 1 00 J1 710 14140 PC BD SW 2 MPX500 1 00 MPX500 MECHANICAL ASSEMBLY PART NO DESCRIPTION QTY REFERENCE 430 14152 DISP LCD 150X32DOTS 12 00 FFC 1 00 454 11095 SW ROCKER 1P2T 6A 250 VERTSLIM1 00 550 11929 KNOB 69D 6MM FL BLK LINE 1 00 550 11931 BUTTON 24X 64 BLK W LT PIPE 6 00 550 14168 KNOB 85D 6MM FL B...

Page 34: ...ER IEC 5A 2M UK 1 00 680 10094 CORD POWER IEC 6A 2M ITALY 1 00 680 10095 CORD POWER IEC 6A 2M SWISS 1 00 680 10096 CORD POWER IEC 6A 2M AUSTRALIA1 00 680 10097 CORD POWER IEC 6A 2M JAPAN 1 00 680 10098 CORD POWER IEC 6A 2M UNIVERSAL1 00 MPX500 SHIPPING MATERIAL PART NO DESCRIPTION QTY REFERENCE 070 14116 GUIDE USER MPX500 1 00 070 14117 NOTICE S W REL MPX500 1 00 730 06785 CARD WARRANTY LEXICON 5 ...

Page 35: ...CHEM MAIN BD MPX500 060 14139 SCHEM SW 1 BD MPX500 060 14149 SCHEM SW 2 BD MPX500 Drawings 080 14127 PC ASSY DWG MAIN BD MPX500 080 14138 PC ASSY DWG SW 1 BD MPX500 080 14148 PC ASSY DWG SW 2 BD MPX500 080 14118 ASSY DWG CHASSIS MPX500 080 14119 ASSY DWG SHIPMENT MPX500 ...

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Page 68: ...Lexicon Inc 3 Oak Park Bedford MA 01730 1441 Tel 781 280 0300 Customer Service Fax 781 280 0499 Email csupport lexicon com www lexicon com Lexicon Part No 070 14399 Rev 0 Printed in U S A ...

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