Lexicon Studio Core2 Service Manual
Contents
1. 2 y y 5 9 L urere we 03055 TWIS 108 00 080 peus m om 5 ON 325 H Mein 2 SISSVHO OMG ASSY P 2 L STI9NV 55101630 20 81191 Sound BON i 13s 03150395 FW 5 v 601v1 220f c 2408 3HL 303543405 10N 5300 AINO 39N343438 8 303 SI B38W N 1899 l 338 ASL AGL AG ANS MMd 191 08 ze M3ANS SZ X 6 Gi HIN ELSEI ORL 5310 401 83 02 l 39 1M 9 003 13841 28911 091 206 was 83 02 NINA SISSvHO N S 13881 8 960 0 67 401 Y3A09 NN3AVB 03141532 0 89980 0 780 i 310 LS X LES 291 504 92 3015 8109 4 Ol X 54 3 8193108d 43400 1191 2012 4 285 X LLL 7305 3Nd 69 91 201 92 l OOSXdW INOYJ TANVd O9ivi 204 2 DOSKAN 83400 991 004 72 az 1 NNOO Ov L T3NVd 15084 Ol 08 NIV v 13NVd 15083 01 508 MS 9 NZ d33 INN 20110 099 700 61 Y3A09 OL 09 78 Hd HNd 1 EW MYOS 66401 19 Bl OL NNOO VON 9 XX 6 78 HNd e exvf 4 1 MYOS 99vli iv9 LL T NYd 1NOB3 OL A2. nOHISPVV 18 Oudvv 104384 Odd8pvw THATS RY 71358 58 1958 51591 MBP Y Y aypueg 0008 1 6 Z01 00 901 SJ38R 1 1L 13 18014 00729 0075 JO 000 1 658 00301 SI8P3A37 18013 008 008 20000 09000 Sz000 002 00 Jo 960 990 000 18014 000 000 JO 180 65 0 8 3 008 008 0430 1043440 TIATRROY 51591 OV aypueg 0008 L 6 Z01 00 801 SJ8R T 1L 13 18014 00 5 0025 JO 000 1 658 00901 S48P 13437 18014 008 008 faypueg 20000 05000 520006 6013 002 00 30 950 990 000 8382 13437 000 000 JO 180 510 648 13 31 16014 008 008 ou3Qv 51581 32014 jequn ZH alld ayy 2 dun bupeay yum pueg 1221861 pus daams
3. 2991 SNORE T 2 MEM KE Your Notes MTS y 9 2 8 1 y 809 60829 INS ue z aziyo EN LLL 22 MISI N 3009 325 66 8219 Nf 88829 wag IN3HOS 356 suu 0610 VW WYO AOYSLNOO 107 8293 223287 998 2 al ua gt 6 PISNI Sia Tamas 70707 4 808 Sona gt 8 WVUOOUd 103135770 gt 295 TONE gt ad SI 2 ON3 60 220 1 ON3 gt ok qe e 1103 gt vient EMS p 242 eza ty 2 ES T M o9 2 123135 2 70 Toss on n i 9N3 E TONS erica 1103 Y 1 na 68108717 58108 o P
4. 1 de em ter oso HOLMS e MOINS 3801S ion 71203188 HOLS 587448 as 1 USA er dc 7031 35015 ARA gu IRIS dvi Tr 1031 MISAS OH TELS 38015 J631 103 urn Y Hl SSY 7097 599448 a 007 GVO 1831 0901 eye Gr 2 1031 T 1033 dvi ur 268 LL 1727771 QuvO8 HE MS OL 0 5 oer El s 108138 HOUMS 108 vos WSISIS Earl END 19915 1 1031 j 5 os Rat Lida 3227 31 8 1021 13 Z MS OL 5 8 4 t M 2 ae LSWYLNOD does m 1 iH OS 02101 a ng or 508 I0ULNOI Tears za ewel en 175 NET 865 164 968 9509 e E 11858438 1004 9 1004 b E y a 2 wie 022805 t T daos laa t 0 66 vg i ve 7659988 1004 EN 010 1 a AAA TRI 1003 1 y im 210 0028086 Z 3 0081068
5. 1581 19113 Lexicon Chapter 5 Troubleshooting Check the Lexicon web site for the latest software and information http www lexicon com The Lexicon Support Knowledgebase http www lexicon com kbase kbase asp Diagnostics The MXP 500 contains two types of Diagnostics Power Up Diagnostics and Extended Diagnostics Each of these 15 described this chapter Power Up Diagnostics On Normal power up the MXP 500 will automatically execute a set of tests that comprise the Power Up Diagnostics All front 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 shown in the example below This will be true for all tests if an error occurs To continue to the next test after a failure is reported press BYPASS Edit Program EDIT LED indicates LOAD LED indicates when test has Passed when test has Failed MSB LSB 5 1 MPX 500 Service Manual The table below displays the Power Up Diagnostic test code which the front panel will display before the tests are executed Test Test Test Descriptions 1 ROM Test
6. BUY 550191533 031 3SIANH3H1O SSTINN viva av i i 1 ANY Ee 102 i 1 sem 1884 7 men hon Ar WW 68683 1 sen o suy 169 169 wo 1 89 ie x s 1 po 1 069 194 2 e 1613 5 NANI 17 1 gt navim vase 23 B 23 298 cou p aasi L D TOT 01 2 5 T sen 1 0 5 99 NE ib o 18 ar SUUS T 85468 NO HA 00 228066 2 S668 8598 ri bos 00 0640668 E3XOSHO 20 0 je y S 9 i 1 8 Your Notes 2 y 5 9 8 8 1 ml 2 vum 86829 gangs n 66828 2 z won 8 22 5 ly 3000 azis 66 809 Mf va 65829 HMM mya die uu 06 10 VW 9303939 AVO UOIIX
7. SNOISIA3H 1 Your Notes E y E 9 8 d g E mp rem 65829 M E S ezo Em 9 5 3000 325 68809 H3MOd 86829 008401 N3HOS PEU ERBEN d EO ag SEIEN 5 sur sur Se Tes Pon da Lem Ls Len den Ta Im Te Ter lg les 1 06110 VW 5 solo wo 99 199 I 1 qn I 2 T 2 1 1 21 u ON 0 6 0027592 TRI 7122 SUOLIIVAYI SSVdAB 11353489 en en t levis 8088 E MUS 20 8 anoos 1 309 L osez MEL 907 vi ans i HO1VH3N39 13534 Qe ONnONO 1 ONNOSD 4144015 OL ZM LM TIVISNIL 4 a re MAS EHON E om 001 58 y 0 E As un IE rm VASE we 4
8. 2 5 y 9 9 1 8 Your Notes 1736 113195 WIN 31995 t 100341 IN3NOdWOO 005 24 00 1 C we ___ amp m mE 41 17 dE ke re so Our LE 28838 mm EE s 5 Your Notes aa LEO 1004y INJNOdNWOO OOSXdW 175 48 24 OK S ok 25 165 e A O 22 T a rt Your Notes L30 EE vs 31925 o 100 1 INJNOdWOO 00SXdA 2985 08 2d 3E Your Notes 1 2 Has Y N 66 22 64 w TIVOS 104 00 NOlvOllddv 81191 080 ware 20 ESE ON moss azis ae p en 1 1 2
9. Thermal Technologies part number e 161000F00000 10 gm or 164000F00000 40 gm 5 8 Lexicon Chapter 6 Theory of Operation Schematic walkthrough Sheet 1 INPUT This sheet shows the input jacks input amplifier 012 024 and A D converter 017 and their associated circuits The 500 is fitted with both balanced phone and XLR input connectors for left and right input signals Inserting the 74 phone plug on J11 or J12 will disconnect signals from XLR jack J10 and J13 respectively The following analog circuit description applies to the left signal channel the function of the corresponding components in the right channel is identical Capacitors C42 and C43 along with ferrite beads FB10 and FB11 prevent unwanted high frequency interference from entering of leaving through the input cables DC blocking is achieved by capacitors C74 and C79 in line with each leg of balanced signal path R71 R72 R74 and R75 along with C73 and C78 form 6dB attenuator with low pass characteristic Single stage input amplifier U12 buffers the attenuated input and supplies gain which is variable from about 9 to 23dB according to the setting of front panel input trim control R149 The amplifier stage tends to balance an unbalanced input more so when operated at the higher gain needed for low level unbalanced signal sources The differential signal from the amplifier is attenuated by R65 R68 ac coupled by C70 and C71 and biased
10. Use anti static containers for handling and transport To make a plastic laminated workbench anti static wash with a solution of Lux liquid detergent and allow to dry without rinsing o Lexicon Table of Contents MPX 500 Service Manual Lexicon Chapter 1 Reference Documents Required Equipment Reference Documents MPX 500 User Guide Lexicon P N 070 14116 or latest revision Required Equipment Tools The following is a minimum suggested technician s tool kit required for performing disassembly assembly and repairs Clean antistatic well lit work area 1 1 Phillips tip screwdriver 1 T9 Torx screwdriver 1 3 16 Hex socket nut driver 1 5 16 Hex socket full hollow nut driver with plastic insert to prevent Front Panel scratches 1 15mm Hex socket nut driver Solder 63 37 Tin Lead Alloy composition low residue no clean solder Magnification glasses and lamps SMT Soldering Desoldering bench top repair station Test Equipment The following is a minimum suggested equipment list required to perform the proof of performance tests e Amplifier with speakers or headphones e Cables dependent on your signal source e Audio Input cable balanced with shield and a XLR or plug on one end and appropriate connector on the opposite end for connection to the Low Distortion Oscillator e Audio Output cable balanced with shield and a XLR 2 plug on one end and
11. 3002 328 68829 INANI 66809 HN ON surl sum DOSXAIN NIVA 7396 06110 VW 9503938 B ON svia 21974109 WAS our A E T 1 1 3805 1 1 8219 BIT A 2 z 200 2 4 2 1309 NANI 2 1305 Ed 2 130 ema 2 7 130 L 9 5 AfidNI LHOIS t 269 4 A 7 1301 T HENAN 13388 3271 0908 40078 1081409 1 3i date Pe xin cele vis 1 daly gt THO E 7 O31vY dOd LON SLNSNOdIHOO i pa 41 5 ZA 72 I 4 1 i 10 Ozh 6184 620 p210 038N SuOJVNOISSQ 15919 ke NS 1 ure 6H2 216 hood 57558229 yt 3 tir GNNOYD 2 ONDONO gt 7 S35 35 i SISSVHO SISSVHO 7 HOW r ES 1 88018890 G31YOIONI SINO G31VOIONI feo e aw an 1010 O31VOIONI ISIMASHAO SSIINA Z i
12. The ROM checksum which is a byte size value is located in the last location of each Bank The test adds the contents of the entire ROM including the check sum byte The result should equal a 0 for the test to pass 2 SRAM Test This test will verify the entire contents of the SRAM The test first writes OOhex 000000000 binary to all of the memory locations and then verifies this by reading back all the memory locations The test will also write read the following patterns 55hex 01010101 binary AAhex 10101010 binary and FFhex 11111111 binary If what is written to all locations is read back the test will pass 3 WCS Test This test will verify the program memory space of the Lexichip 3 The Ram memory space first filled with the value 55hex 01010101 binary then each memory location is read back to confirm it contains the 55 The memory space 15 then filled with AAhex 10101010 binary and the memory 15 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 at the proper time intervals The Lexichip 3 does this by providing this signal to the Z80 s maskable interrupt line If the 280 sees the signal at the proper times the test will pass 5 ADF Test This test will verify that the Audio Data File in the Lexichip 3 is working properly
13. appropriate connector on the opposite end for connection to the Distortion Analyzer e 1 MPX 500 Power Cord choose accordingly CORD POWER NA IEC SVT VW 1 10A AMER Lexicon P N 680 09149 e CORD POWER IEC 6A 2M EURO Lexicon P N 680 08830 CORD POWER IEC 5A 2M UK Lexicon P N 680 10093 e CORD POWER IEC 6A 2M ITALY Lexicon P N 680 10094 e CORD POWER IEC 6A 2M SWISS Lexicon P N 680 10095 CORD POWER IEC 6A 2M AUSTRALIA Lexicon P N 680 10096 e CORD POWER IEC 6A 2M JAPAN Lexicon P N 680 10097 CORD POWER IEC 6A 2M UNIVERSAL Lexicon P N 680 10098 e 1 Low Distortion Oscillator with Single ended or balanced output 100 ohms output impedance 0 00596 THD e 1 analog Distortion Analyzer and Level Meter with single ended or balanced input switchable 30Hz highpass filter or audio bandpass 20 20 2 filter e 1 100 MHz oscilloscope 1 1 Lexicon Chapter 2 General Information Periodic Maintenance Under normal conditions the MPX 500 requires minimal maintenance Use a soft lint free cloth slightly dampened with warm water and mild detergent to clean the exterior surfaces of the connector box Do not use alcohol benzene or acetone based cleaners or any strong commercial cleaners Avoid using abrasive materials such as steel wool or metal polish It the unit is exposed to a dusty environment a vacuum or low pressure blower may be used to remove dust from the unit s exterior Ordering Pa
14. 245 09876 CAPSM CER 01uF 50V Z5U 20 6 00 245 10561 CAPSM CER 100pF 50V COG 5 2 00 245 10562 CAPSM CER 150pF 50V COG 10 15 00 Lexicon REFERENCE Lexichip Heatsink R2 R149 R28 30 32 R9 20 96 98 R16 78 R1 10 17 23 24 29 R54 56 58 76 79 81 85 88 95 99 114 122 R25 27 77 102 112 R11 12 R21 83 100 101 R124 131 R19 57 84 R89 92 132 133 R22 R18 R5 7 8 R6 33 35 43 45 R113 R60 R34 36 41 42 44 46 R51 52 61 64 70 73 R134 137 143 146 R62 63 66 68 135 R136 139 141 R15 R13 14 R38 39 48 49 R65 67 138 140 R69 142 R71 72 74 75 144 R145 147 148 R37 40 47 50 C53 C74 79 119 124 C16 17 50 C63 69 90 95 96 C101 114 C11 C70 71 115 116 C65 67 85 C20 22 47 49 52 C83 C8 13 62 81 102 103 C2 3 C5 6 19 21 24 26 7 1 MPX 500 Service Manual PART 245 10587 245 10976 245 11594 245 11625 245 11626 245 11899 245 12485 270 06671 270 11545 300 10509 300 10563 310 10510 330 10523 330 10528 330 10535 330 10537 330 11990 330 12844 340 11573 345 12060 350 12384 350 13863 350 14158 350 14175 350 14176 355 12333 355 13829 365 09883 375 12110 390 12361 390 12362 452 11947 510 07888 510 09790 510 10881 510 11087 510 13149 510 14156 510 14159 520 09736 620 12428 635 05689 640 01706 640 04339 643 01732 650 03970 675 08256 7 2 DESCRIPTION QTY CAPSM CER 18pF 50V COG 10 2 00 CAPSM CER 47pF 50V COG 5 6 00 CAPSM CER 2200pF 50V COG 5 2 00 CAPSM CER 33pF 50V COG 5 8 00 CAPSM CER 75pF
15. THOUMS 589438 Ho IE SSVdA8 MS __ r a 7 oE HOLMS 2907 H 10 TONS avon HOLMES Gb 7193135 HOLMES YMS _ 5 JHOIMS 29015 E EE oe 4 JH 9 THOLUMS Vi non Gt 2 1081 35015 y 1931 55 9 9 dvi 7031 0907 4 J631 dvi 0697 08 08 OL 1931738015 ig 34015 4 i 13150408 4 55 4 8 zo E 4 1 50 aT HL 4 m Tr El SNOISIAZY 2 y 5 9 1 Your Notes z v S 9 1 8 ams 106881 6559 canes 3 13 0 6 191 090 8 pte 20 E 3000 azis 6699 QOSXd ZR MS WaHOS 58809 HMY pa qu aia S NAOuddv 06110 0804038 uooixe Wad v 1193138 HOLM a 1193138 HOLAS 1 5 W3ISAS HOLMS 103 MILMS 7031 W31SAS SILON 103 1031 W31SAS WALSIS NUS i 1031 103 m 2 um 530
16. lt 0 005 Move the cables to the Right Inputs Outputs connections and repeat step 5 gt Crosstalk Tests These tests will verify the crosstalk specifications of the MPX 500 s Left and Right input to output circuitry Analog In To Analog Out Crosstalk Test Apply 1kHz sinewave signal to the MPX 500 Left Input 7 746Vrms Connect the Right Output to the Distortion Analyzer Enable the Low pass filters on the Analyzer 30kHz 20 2 Sweep the Oscillator from 20Hz to 20kHz and verify the level to be gt 245mVrms throughout the sweep 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 Apply 1kHz sinewave signal to the MPX 500 Left Input 7 746Vrms Connect the Left Output to the Distortion Analyzer Set the Distortion Analyzer for OdB reference Remove the Input cable from the Left input Enable the Low pass filters on the Analyzer 30kHz 20 2 Verify the Noise level at the Left Output is gt 97dBr 218mVrms 101 typical Connect 1kHz sinewave signal to the Right Input of the MPX 500 Move the Left Output cable to the Right Output Set the Distortion Analyzer for a OdB reference 10 Remove the Input cable from the Right input 11 Enable t
17. 4 bi vas tou im NUNS inii Pal 50066 1 LoT T 50 ov v Y q HOLIMS N E E SON z Lan ale Mise 907 SIT 020 WOT 10 NN T Nunisz veu A KON 4 I I 1 84 was 35945 NE 66 4 i pl BAS I ae nos pu 1 0006206680 O3ONWHO piod 88061138 E 1 8 Your Notes E z E 9 1 3 pes 106619 66529 Mansel 1 YN 33 lo g A 99 328 88509 WO3 amomo 00SXdW Ht MS W3HOS 58009 HME 06 0 0404038 SMS o 9 0 HOMS _ o 10318 o tz NS ama Ko o EY o 5 TOTES FOIS EMS _ _ alo HOLAS 38015 oft 38015 IMS __ r 3 2
18. 422 01 001 4005 01 4001 4005 01 4001 00 0FL 6 96 00081 76 56 60000 05000 990 950 9992 00 0FL 76 96 0008 L 76 56 e000 0 05000 960 950 9992 00 L01 00011 9600 0 000 0092 00 101 00 011 0900 0 000 00 92 166 0009 105 05 000 105 05 000 000 000 548P 00 09 000 000 000 000 00 09 00 0 00 0 00 0 00 0 548P 00 09 000 000 000 000 lg 8 0 8 QHISPVO 04340 104 487 0 943870 TIT RYO 1591 48h Harta Harrya lg UXPFYO 1 04340 1043440 4 5 Lexicon Audio Precision Summary 548P 548P 51581 16014 18013 16013 18014 18013 16014 30 02 ADOL 40 320 02 ADOL 30 A22 01 400 LO 1005 01 4001 JO 1005 01 4001 JO 4005 01 4001 10 000FL T596 00101 00081 6 86 0086 10000 05000 5600 0 lt 90 90L 000 9095 0052 Give SESE 0092 0002 0002 0061 0071 00 61 0061 0002 0002 0061 0021 0061 0061 8 8 Live
19. 50V COG 5 4 00 CAPSM CER 820pF 50V COG 5 4 00 CAPSM CER 1uF 25V Z5U 20 45 00 FERRITE CHOKE 2 5 TURN 3 00 FERRITESM CHIP 600 OHM 0805 16 00 DIODESM 1N914 SOT23 26 00 DIODESM DUAL SERIES GP SOT23 3 00 TRANSISTORSM 2N3904 SOT23 1 00 ICSM DIGITAL 74HCU04 SOIC 3 00 ICSM DIGITAL 74HC153 SOIC 1 00 ICSM DIGITAL 74AC273 SOIC 1 00 ICSM DIGITAL 74HC541 SOIC 3 00 ICSM LEXICHIP3B 100PIN PQFP 1 00 ICSM DIGITAL 74HC132 SOIC ICSM LIN NJM4580 DUALOPAMP SOP 4 00 ICSM INTER CS8412 RCVR SOIC 1 00 ICSM DRAM 1MX4 60NS SOJ 1 00 ICSM SRAM 32KX8 70NS SOIC 20uA 1 00 ICSM EEPROM 24C32 32K SER SOIC 1 00 IC ROM 27C020 MPX500 V 1 04 1 00 ICSM GAL 16V8 MPX500 V1 00 1 00 ICSM DAC CS4390 24BIT STR SSOP 1 00 ICSM ADC AKM5383 24b 96kHz SOP 1 00 ICSM uPROC Z80 CMOS 10MHz QFP 1 00 ICSM OPTO ISOL HCPL0601 SOIC 1 00 CRYSTALSM 11 2896MHz PAR HC49 1 00 CRYSTALSM 12 288MHz PAR HC49 1 00 SW RTY ENC 16POS 4BIT 15 5L 4 00 CONN AC 3MC PCRA IEC 10A 1 00 CONN DIN 5FC 180DEG PCRA SHLD2 00 CONN XLR 3MC PCRA PLASTIC CMPT2 00 1 4 PH JACK PCRA 3C SW TR G FT 5 00 CONN RCA PCRA 1FCGX2V WH RED G CONN FFC 1 25MM 22POS PCRA 1 00 CONN XLR 3FC PCRA NO LATCH SM 2 00 IC SCKT 32 PIN PC TIN LO PRO 1 00 4 INT STAR XLR GND 2 00 FASTNR SWAGE PCB 4 40X 065 SS 4 00 SCRW 4 40X3 8 PNH PH ZN 2 00 SCRW 4 40X1 4 PNH PH SEMS ZN 4 00 NUT 4 40 KEP ZN 2 00 POPRVT 1 8X1 8 REG HD SS 1 00 WIRE 22G BLU 2 5 187QDC ST 1 00 C33 35 42 46 48 51 REFERENCE C25 34 C7 12
20. DESCRIPTION DISP LCD 150X32DOT S 12 00 FFC QTY 1 00 SW ROCKER 1P2T 6A 250 VERTSLIM1 00 KNOB 69D 6MM FL BLK LINE BUTTON 24X 64 BLK W LT PIPE KNOB 85D 6MM FL BLK KNOB 1 05D 6MM FL BLK SPCR 4 40X7 16 3 16HEX NYL SPCR 141DX 250DX 375L AL SCRW 4 40X3 8 PNH PH BLK SCRW 4 40X3 16 PNH PH NYL SCRW TAP 4X3 8 PNH PH BZ TRI SCRW TAP AB Z2X1 4 PNH PH BZ NUT 4 40 KEP ZN COVER MPX500 PANEL FRONT MPX500 PANEL SIDE 1 71X5 42 COVER PROTECTIVE PS 4 10X4 10 LENS 3 37X 87 CLR 1 00 6 00 4 00 1 00 2 00 4 00 7 00 2 00 9 00 4 00 6 00 Lexicon J16 REFERENCE AC CONN J1 TO FP J15 J14 MAIN BD MTG U10 REFERENCE D1 4 SW5 SW1 4 D1 4 41 REFERENCE D1 2 SW1 2 D1 2 J1 REFERENCE DISPLAY SW BDS TO FP COVER TO FP amp SIDE PANELS AC CONN DISPLAY XLR 8 RCA CONN DIN CONN SW BDS TO 4 KEYSTONE TO FP 1 AC CONN 1 COVER INSIDE 7 3 MPX 500 Service Manual 740 08558 PART 740 09538 740 11482 740 13573 LABEL TUV CERTIFIED BAYERN 1 00 DESCRIPTION QTY LABEL S N CHASSIS PRINTED 1 00 LABEL WARN APP FCC C UL CE PRO 1 00 LABEL MFR ID 9X 25 SILVER 1 00 MPX500 POWER CORD OPTIONS PART NO 680 09149 680 08830 680 10093 680 10094 680 10095 680 10096 680 10097 680 10098 DESCRIPTION QTY CORD POWER NA IEC SVT VW 1 10A 1 00 CORD POWER IEC 6A 2M EURO 1 00 CORD POWER IEC 5A 2M UK 1 00 CORD POWER IEC 6A 2M ITALY 1 00 CORD POWER IEC 6A 2M SWISS 1 00 COR
21. Removing covers will expose you to hazardous voltages This triangie which appears on your 9 y This triangle which appears on your A O CAUTION component alerts you to important ence of uningulated dangerous volt insi intenance instruc age inside the enclosure voltage operating and maintenance instruc that may be sufficient to constitute a e tions in this accompanying litera ture tisk of shock Notice This equipment generates and uses radio frequency energy and if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio and television reception has been type tested and found to comply with the limits fora Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules which are designated to provide reasonable protection against such interference in a residential installation However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television reception which can be determined by tuming the equipment OFF and ON the user is encouraged to try to correct the interference by one or more of the following measures Reorient the receiving antenna Relocate the computer with respect to the receiver Move the computer away from the receiver Plug the computer into a different outlet so that the computer and re
22. The Lexichip 3 Audio Data File ADF is a fast synchronous 128 word SRAM that provides audio data buffering and storage for external memory references Serial I O and the Host to Lexichip data port ADF locations also function as ARU Registers as scratchpad memory 6 EEPROM Test This test will verify the functions of the on the MPX 500 First the test will verify that the EEPROM has been initialized properly This is done by storing the software version of the EPROM in the first five bytes of the EEPROM Then the stored value is verified if correct 5 2 Lexicon when the test is executed If the stored value read from the first five bytes of the EEPROM is incorrect the EEPROM will be initialized the 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 Extended Diagnostics Extended Diagnostics are provided to help in troubleshooting specific functions in the MPX 500 To enter the Extended Diagnostics power on the unit while pressing down 8 holding the BYPASS button on the front panel of the MPX 500 When the EDIT LED is lit 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 display
23. and give the name and telephone daytime number of the person directly responsible for maintaining the unit Do no include accessories such as manuals audio cables footswitches etc with the unit unless specifically requested to do so by Lexicon Customer Service personnel 2 1 Chapter 3 Specifications Analog Inputs Connectors XLR TRS balanced Impedance 50k balanced 25kQ unbalanced A D Dynamic Range 10584 typical Levels 20 to 8dBu full scale Resolution 24 Bit Sigma Delta Conversion Analog Outputs Connectors XLR TRS balanced Impedance lt 6000 D A Dynamic Range 1014 typical Levels 26dBu balanced 20dBu unbalanced Resolution 24 Bit Sigma Delta Conversion Frequency Response 20Hz 20kHz 1dB Crosstalk 96dB 1kHz THD 0 596 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 Connector RFI ESD FCC Class B European EMC Directive 89 336 ECC Environment Operating Temperature 32 104 F 0 40 C Relative Humidity 95 non condensing Dimensions 19 W x 1 75 H x 5 5 D 483x45x140 25mm Weight 3 lbs 1 4kg Lexicon 3 1 Lexicon Chapter 4 Performance Verification This sect
24. and judgment Generates an error message 0 OFF 12 ON To execute each of the following tests the BANK button must be pressed PROGRAM knob The lower left side of 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 executing the test 1 ROM Test The ROM checksum which is a byte size value is located in the last location of each Bank The test adds the contents of the entire ROM including the check sum byte The result should equal a 0 for the test to pass 2 SRAM Test This test will verify the entire contents of the SRAM with the exception of the stack area which is tested by the power up SRAM test The test first writes OOhex 000000000 binary to all of the memory locations and then verifies this by reading back all the memory locations The test will also write read the following patterns 55hex 01010101 binary AAhex 10101010 binary and FFhex 11111111 binary 5 4 Lexicon If what is written to all locations is read back the test will pass 3 WCS Test This test will verify the program memory space of the Lexichip 3 The Ram memory space is first filled
25. du 3507 ONY Seis 306 0103 8 154 803 335 ALAYO g 0809 5304 2 5304 2 1838 3HL ISNIVOV OLNI XOVE o 18191 06 8 gt 54413 YVINONVIOIS iHDNVHIS 30 QN3 3dvi ONY dN 0103 NMOHS SY UNA 037935 30 SON NO SiN3SNI UND 3HL 30 WOLL08 NO 9 ONY SISVIYO TN OS 998 WIS ONY 0103 98 Ni 401 3snivN3i ind OVE 9 NOLVIN3An200 15311 30 30N3ND3S ONY 1511 303 WOB OL 83438 Ova Ni 108 30191 220 40 JHL 303533915 10 5300 AINO 39N383434 303 SI 5 N38ADN 134 c S310N 28 91 08 8 x08 12800 05 ova ANSIO 9 2820 0544 ove 3univeain 56 2 23 00 611166 093 838 t amp 86 62 11 3snivain HUNS 4043340539 21 SNOISIIE 2 D 9 L 8 NOT 3 Your Notes Lexicon Inc 3 Oak Park Bedford MA 01730 1441 Tel 781 280 0300 Customer Service Fax 781 280 0499 Email Esupport lexicon com lexicon com Lexicon Part No 070 14399 Rev 0 Printed in U S A
26. even 66829 Mans z serio sess 122 20 201 8 or E 86 909 MT 80795051 0065 poet low wars NvsWOM 86829 008 W3HOS 1 IBONG veis 389 52172 DELIO YW 9303938 160 9 28 6 28 m JYO UOIIX9 ON 0 2117 ly D 0 92 en 4 veu Moz 7802 av ROH oh L Doze Dra E Avr la 2 8 Sl x 52 oin p M 907 91 L4 32 11 a i 5 2 ONS ONS ONS ONI QNO UNO we 55 oz oo 00 40 55 122 ES Sin 09352 110008 1700 0700 1780 oii 1 8 WZ no 09 E 1 KA bod mz T zr unoonoz xx 18 lors e 8 38019533 6 192 EXIT 1582 1 saz 9 E 8 eee 092 Tona TONINOO E So 00 802 80250 et 207 702 Y 028 102 102 i8 002 az 0i en anol 20302 8 95283 87 1097 988 496H 08 Yaz 9009 YN ee 18104 9 7 2 5 95978018 DN QNS 5 YX 2700 978019 QVI I 1 1 QN 578010 WWE VE 2 p E TOS EEN
27. sheet shows the front panel PROGRAM EDIT encoders and their associated circuits Four bit gray code encoders SW1 SWA 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 during the reading of the selected encoder pair An encoder is selected when its C pin is set low which allows the encoder to assert its current position onto the ENC bus via the corresponding group of diodes The C pin is controlled via Lexichip3 sheet 3 PIO bits In addition to the encoders the closure of the individual front panel switches associated with D5 D6 D28 D29 D7 D8 and D9 can be read when SWITCH SELECT sheet 6 A5 is asserted Software selects which set of signals is placed on the ENC bus by asserting ADJ12 SELECT ADJ34 SELECT or SWITCH SELECT The state of the ENC bus is then read via the 74HC541 U23 Sheet 5 MIDI DIGITAL AUDIO OUT This sheet shows the Clock generation MIDI and S PDIF and their associated circuits At the center of the sheet are the crystal oscillators which are the basis for the two sample rate clocks 44 1 kHz and 48 kHz These clocks 256FS441 and 256FS48M plus 256FSPLL from the digital audio receiver are fed to
28. test is Running and the LCD Display is filled with 3 random patterns until all of the pixels have turned black on the LCD Display Press and hold the BANK button PROGRAM knob This will clear all of the pixels on the LCD Display Releasing the BANK button will exit the test The LCD Display will indicate Done 12 Exit Test This selection will allow the user to exit the Extended Diagnostic Mode and enter normal operating mode Pressing the BANK button PROGRAM knob will execute the test 13 Initialize Test This test will initialize all of the MPX 500 system parameters to their factory default settings Pressing the BANK button PROGRAM knob will execute the test WARNING This procedure will destroy any user settings or registers 14 Unused 15 Unused 16 Burn In Test The Burn In test is structured to help in two ways 5 7 MPX 500 Service Manual One is for the factory Once the unit is manufactured and tested it is placed in this burn in loop over a period of time to exercise the main circuitry and verify the unit is performing to manufactured specifications The second is for in field repair It allows you to exercise the circuitry after repairs have been made Again this is to insure the performance and specification of the MPX 500 During the execution of the Diagnostics in the Burn In loop the appropriate test code will be displayed on the Binary LED s BYPASS STORE 4 TAP This code will be sent to
29. to 2 5VDC through R62 and R63 The bias voltage is developed from 5VA by the voltage divider formed by R61 and R64 filtered by C68 and C69 The amplifier output is attenuated by about 18dB to drive the differential input of the A D converter which has a full scale sensitivity of about 7dBu The 14dB trim range varies the resulting full scale input sensitivity from around 6dBV to 22dBu Capacitors C92 and C98 at the converter input serve to reduce ailing of spectral components at the 5 to 6 2 oversampling frequency The AK5383 U17 is a 24bit 128X over sampling 2 channel A D converter configured to produce serial digital audio in 125 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 associated circuits The 24 bit 2 channel D A converter CS4390 is configured to accept serial digital audio in 125 format The following analog circuit description is for the left channel the function of the corresponding components in the right channel is identical The output of the converter feeds a differential multiple feedback 2 pole low pass filter having a gain of about 12dB formed by one section of dual op amp U7 and associated components The other section of U7 inverts the single ended filtered signal The two outputs of U7 drive the balanced output through series resistors R35 and R33 which isolate the amplifiers from
30. 00 202 09795 RESSM RO 5 1 10W 2 2K OHM 5 00 202 09871 RESSM RO 5 1 10W 1K OHM 2 00 202 09873 55 5 1 10 10 OHM 29 00 202 09899 RESSM RO 5 1 10W 47 OHM 15 00 202 10557 RESSM RO 5 1 10W 4 7K OHM 2 00 202 10558 RESSM RO 5 1 10W 47K OHM 12 00 202 10559 RESSM RO 5 1 10W 100 OHM 3 00 202 10569 RESSM RO 5 1 10W 10 OHM 1 00 202 10574 RESSM RO 5 1 10W 10M OHM 2 00 202 10586 RESSM RO 5 1 4W 100 OHM 1 00 202 10891 RESSM RO 5 1 10W 270 OHM 6 00 202 11041 RESSM RO 5 1 10W 680 OHM 1 00 202 11071 RESSM RO 5 1 4W 75 OHM 1 00 202 11072 RESSM RO 5 1 4W 220 OHM 3 00 202 11073 RESSM RO 5 1 4W 270 OHM 5 00 202 11347 RESSM RO 5 1 4W 3 OHM 1 00 202 11683 RESSM RO 5 1 10W 5 1 OHM 1 00 203 10583 RESSM RO 1 1 10W 10 0K OHM 16 00 203 10896 RESSM RO 1 1 10W 1 00K OHM 8 00 203 11075 RESSM RO 1 1 10W 95 3 OHM 1 00 203 11079 RESSM RO 1 1 10W 715 OHM 2 00 203 11723 RESSM RO 1 1 10W 4 75K OHM 4 00 203 11992 gt RESSM RO 1 1 10W 174 OHM 4 00 203 12481 RESSM RO 1 1 10W 1 5K OHM 2 00 203 12837 RESSM RO 1 1 10W 13 0K OHM 8 00 203 12841 RESSM RO 1 1 10W 39 2K OHM 4 00 240 01262 CAP ELEC 330uF 25V 20 RAD 1 00 240 09367 CAPSM ELEC 10uF 25V NONPOL 20 4 00 240 09786 CAP ELEC 100uF 25V RAD LOW ESR 3 00 240 11827 CAPSM ELEC 10uF 16V 20 7 00 240 13216 CAPSM ELEC 22uF 16V 20 1 00 240 13217 CAPSM ELEC 47uF 16V 20 4 00 241 09798 CAPSM TANT 10uF 10V 20 3 00 244 10423 CAP MYL 22UF 10 RAD 5 00 244 12322 CAP MYL 047uF 50V RAD 5 BOX 1 00
31. 07082 08108 048 NT 0845 119302 INS WOH 08 2 24 HEZA INIOS 278014 v7 liz 5 94196253 1838 178014 ZW ON inosziS4 1108 07808 AM 20 GA 110 84962 20 897 Y novesi 0109 X Wi 22 ans ance noisi T 010008 01100879 NZ 310181 Tid ONIOS ONIOS Wi SZ UINOOM NOM x Pr 9 EA NOTION 7190 Ea N41S1 2 LW ra 90 9 5 WZ 19 F4 H pA 5 2 Qno ON NOM AA ange SNOL gt 883209 I 3 oon Nid 088 2 3L ON D sm izsl 9 i FALSE ON EEN u gt 1 4 1091 Ie E x maps gt vars 6 vx v vola gax 0 xWavo diNoQv 3 W E ES A 8 5 MOTA 30015 808433 oW dux D 1193188 i VN wr Ox 0 20 ei ovx vo t i T Ld GAS 00228065 21 IN e 208 5 FOr 664066 1 i ES jj
32. 100 3048 e Tmo Ta 4 m 480 T T 882 E alva ven 2 9 21 901 22 ii 3733992 775395 5 ONE born e BE o 108 ES on qe sari 192 3nadu ons Es 15274 89 y rpm least IE on AO ov NOLLVH3N39 9012 15555 e evio ewsel 222 QS Sn8 10HINOO T 1 39001 3800 sore OT 9 m GETUS 1 T 0 POENT E 2 w ur j EJE ig 78 s 00429096 184 6886 6599 02 E jeu 0006086 HOO indifO IAWN 5N run 5 1 en ans SNOISIAIS 4 2 5 9 2 8 Your Notes le 2 y 5 9 1 8 8 1309 86809 8 m 83088 serio 8 Bi 8 3009 325 68809 3AISO 8510 66879 WEHOS ae eWay 5122 YW QuoJ038 NWO
33. 73 78 118 123 C92 98 C72 77 87 88 109 C110 117 122 C29 30 38 39 C31 32 40 41 C1 4 9 10 14 15 18 C23 27 28 36 37 C54 61 64 66 68 75 C76 80 82 84 86 89 C91 93 94 97 99 100 C104 108 112 113 C120 121 FB3 5 FB1 2 6 19 D1 2 4 9 12 29 D3 10 11 U10 J6 9 J4 7 8 11 12 1 00 J5 J19 J10 13 U9 96 9 PS TO MAIN BD AC J1 PS TO MAIN BD AC CONN J1 BRKT TO MAIN BD J17 675 08257 PART 675 14137 680 14173 680 14174 701 14147 704 14132 710 14120 750 14151 WIRE 22G BRN 2 5 187QDC ST DESCRIPTION WIRE 18G GRN YEL 7 6RING SS CABLE 156 HSG ST amp T 4C 3 CABLE 100 HSG ST amp T 2C 3 BRACKET KEYSTONE 633 140DX2 HEATSINK TO220 75X 5X 5 H 500 PWR SUP 5V 15V 15V 16 5W MPX500 SW 1 BOARD ASSEMBLY PART NO 430 07326 452 14155 453 12166 630 14190 680 14171 710 14130 DESCRIPTION LED GRN T1 LITON SW RTY ENC 24POS 12MM PBM SW PBM 1P1T 6MMSQ 250GF SPCR LED T1 2MMH CABLE RIB 24 26AWG 14CX 1 3 L PC BD SW 1 MPX500 MPX500 SW 2 BOARD ASSEMBLY PART NO 430 07326 453 12166 630 14190 680 14170 7710 14140 DESCRIPTION LED GRN T1 LITON SW PBM 1P1T 6MMSQ 250GF SPCR LED T1 2MMH CABLE RIB 24 26AWG 6CX 1 3 L BD SW 2 MPX500 MPX500 MECHANICAL ASSEMBLY PART NO 430 14152 454 11095 550 11929 550 11931 550 14168 550 14169 630 14114 635 12831 640 02812 640 14115 641 11466 641 12759 643 01732 700 14164 702 14160 702 14163 702 14177 703 14167
34. 74HC153 U15 where they are software selected via CLK_SELO and CLK SEL1 A GAL16V8R 25 U10 provides various clocks and control signals including ZRST to the Z80 The Lexichip3 is clocked by 256FS48 and is set to execute 255 instructions out of a possible 256 This means that it will execute DSP operations properly at 48 kHz ca 0 4 1 256 The MPX500 MIDI interface complies with the MIDI specification It incorporates 5 pin female DIN connectors for input thru and out 92 and J3 J3 is shared for thu and out according to how the Lexichip3 is programmed MIDI INPUT is opto coupled for ground isolation through U1 to the MIDI UART within the Lexichip3 sheet 3 The MIDI OUTPUT signal is generated by the Lexichip3 sheet 3 and is fed to current loop driver Q1 and out J3 FB1 2 and J2 3 shields connection to ground are to reduce RFI Lexicon The S PDIF OUT is generated by the Lexichip3 sheet 3 and buffered by two gate sections of 03 74HC132 The voltage divider formed by R13 R15 develops open circuit voltage at J5 1Vp p ac coupled by C8 and C9 Output impedance is about 750 which produces the standard 500mVp p S PDIF signal when connected to a 750 terminated load The S PDIF OUT is gated with RESET to mute the digital output S PDIF IN connected to J5 is terminated in 75O by R18 ac coupled by C13 and amplified by U4 74HCU04 Current limiting resistor R19 and clamping diode D3 provide input protection The amplified signa
35. ASS button can be released After it is released the EDIT LED will out and the LCD Display will indicate the first test 1 ROM Turn the Program Knob until test 10 Midi test is displayed Connect a 5 Pin 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 Footswitch Functionality Footswitch functionality is performed through the extended diagnostics of the MPX 500 To enter the Extended Diagnostics power on the unit while pressing down 4 holding the BYPASS button on the front panel of the 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 first test 1 ROM Turn the Program Knob CW until test 8 Switch test is displayed To perform this test a Dual stereo style footswitch must be plugged into the Footswitch jack on the back of the MPX 500 using a tip ring sleeve cable Press the Program Knob once to execute the test Press the LEFT FOOTSWITCH Ring The BYPASS LED will light and the LCD Display will indicate BYPASS The remaining LEDs will be off When the LEFT FOOTSWITCH released the BYPASS LED will go off Press t
36. D POWER IEC 6A 2M AUSTRALIA1 00 CORD POWER IEC 6A 2M JAPAN 1 00 CORD POWER IEC 6A 2M UNIVERSAL1 00 MPX500 SHIPPING MATERIAL PART NO 070 14116 070 14117 1730 06785 7730 09509 7730 14180 7730 14181 1730 14182 7730 14183 7740 07693 7 4 DESCRIPTION QTY GUIDE USER MPX500 1 00 NOTICE S W REL MPX500 1 00 CARD WARRANTY LEXICON 5 5X7 1 00 CARD REGISTRATION GENERAL 1 00 CERTIFICATE CE MPX500 1 00 INSERT FOAM ENDCAP 1UX5 5 2 00 BOX 22X8X4 250LB 1 00 SLEEVE DSPLY MPX500 1 00 LABEL LEXICON DIG AUDIO 3 X5 2 00 TOP COVER REFERENCE REAR COVER TOP COVER REAR COVER REFERENCE REFERENCE Chapter 8 Schematics and Drawings Schematics 060 14128 SCHEM 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 Lexicon 8 1 2 1 D 5 9 8 80 61 6661 1 6 1 30i sl 1 66829 Mf gangs E Mo A 8 22 Ad
37. I ON JOVeINOD Ml 02 1 1 p 298 un 4 ONO ONDA EI You y Gv mao 8r at 1 il 52 1030 VINOS Esc yiya vg HOT A worl unov ONE curso a d 4 ae i 38028 065755 e 14 ini 501 E EJ tro Ha 5 183 992 3 om pro N wise L ONLESSANI M3AISO ONLESSANEFNON 4317113 CE 58188 woa Wo d 00 28066 6588 56798 1 00052006 HOG GZONYHO Hm D as SNOISIA3H i 1 1 y 1 3 Your Notes 2 5 9 2 8 E 1 He um
38. MPX 500 24 Bit Dual Channel Processor Service Manual MPX 500 Service Manual Precautions Save these instructions for later use Follow ali instructions and warnings marked on the unit Always use with the correct line voltage Refer to the manufacturer s operating instructions for power requirements Be advised that different operating voltages may require the use of a different line cord and or attachment plug Do not install the unit in an unventilated rack or directly above heat producing equipment such as power amplifiers Observe the maximum ambient operating temperature listed in the product specification Slots and openings on the case are provided for ventilation to ensure reliable operation and prevent it from overheating these openings must not be blocked or covered Never push objects of any kind through any of the ventilation slots Never spill a liquid of any kind on the unit This product is equipped with a 3 wire grounding type plug This is a safety feature and should not be defeated Never attach audio power amplifier outputs directly to any of the unit s connectors To prevent shock or fire hazard do not expose the unit to rain or moisture or operate it where it will be exposed to water Donotattempttooperate unitif thas been dropped damaged exposed to liquids it exhibits a distinct change in performance indicating the need for service This unit should only be opened by qualified service personnel
39. OTSWITCH TIP The TAP LED will light and the LCD Display will indicate The remaining LEDs will be off When the RIGHT FOOTSWITCH released the TAP LED will go off Front Panel Switches Press and hold the EDIT button The EDIT LED will light and the LCD Display will indicate EDIT The remaining LEDs will be off When the EDIT button released the EDIT LED will be turned off Press and hold the SYSTEM button The SYSTEM LED will light and the LCD Display will indicate SYSTEM The remaining LEDs will be off When the SYSTEM button is released the SYSTEM LED will be turned off Press and hold the LOAD button The LOAD LED will light and the LCD Display will indicate LOAD The remaining LEDs will be off When the LOAD button released the LOAD LED will be turned off Press and hold the BYPASS button The BYPASS LED will light and the LCD Display will indicate BYPASS The remaining LEDs will be off When the BYPASS button is released the BYPASS LED will be turned off Press and hold the STORE button The STORE LED will light and the LCD Display will indicate STORE The remaining LEDs will be off When the STORE button 5 released the STORE LED will be turned off Press and hold the TAP button The TAP LED will light and the LCD Display will indicate The remaining LEDs will be off When the TAP button released the TAP LED will be turned off Press and hold the BANK butt
40. VIASIO NOTAN Hd HNd 91 6 0 MYOS 91171 09 91 9 9 1 NNOO OW 9 513 14083 306 01 83 02 4 Z8 Hd HNd B CXOv v MNOS 21820 099 61 el TaNVd 1NONJ 01 508 MS ISLE X 00527 X Gi vU 3045 1682 6098 221 TANVd 1NON4 OL 190 4 91 6 91 2 X Orr 9995 9191 0609 ol i 4 WW9 70501 BONY 69191 055 6 y u WW9 891 096 8 9 11 M WIG 90 0 NolinB 156 096 1 l 3Nn 14 WN9 069 BONA 6Z6L1 0GG 9 io OSZOVO LZdl H33008 HOIMS 56014 0 05 51000 lt 061 091 480 25171 09 ASSY 08 2086 id 21191 70 ASSY 08 ifMS id 11191 020 7 i ASSY 09 d 6191 6001 0351 GH AD d ID OXHI UMG 530 ds SNOISIA3S 1 y 5 Your Notes 038098 318000 0103 OLNI UNN 3015 iN3SNI WvO3 2 y 5 9 8 130 Y N EL 56 9176 W gans 27 25 LON 00 81191 080 ear m GRO a DON mosi 32 O0SXdN IN3AdIHS E 1 T Lc ree po IMG ASSY zul snow india sions 7 176 on Dis Cu Qvov 0310345 ISMAILO SW 6191 0949 6 men Qi N3MOd evi 38012 ISN SONI H108 NO 343316 Aviesia 0 vid 6
41. capacitive loads and present a differential output impedance of around 600 ohms Output is available simultaneously on the parallel wired XLR and phone jack connectors J6 and J7 If unbalanced output wiring is used which grounds the ring of J7 R33 limits the current Full scale differential output from the converter is 2Vrms or about 8dBu which results in a full scale output level of 26dBu balanced 20dBu unbalanced Capacitors C24 and C26 along with ferrite beads FB6 and FB7 prevent unwanted high frequency interference from entering or leaving through the output cables For information on CS4390 see http www cirrus com products overviews cs4380 html Product data sheet PDF http www cirrus com ftp pubs 4390 pdf Sheet 3 LEXICHIP3 ROM RAM uPROC This sheet shows the Z80 microprocessor U13 EPROM U9 EEPROM U5 SRAM U2 Audio DRAM U6 and digital signal processor Lexichip3 U10 and their associated circuits 6 1 MPX 500 Service Manual The configuration resistors R115 R122 on system data bus are used to program the Lexichip3 operating mode Upon the rising edge RESET various Lexichip3 mode bits are set which determines the system operating parameters If any chip on the 280 data bus erroneously drives the data bus during RESET the Lexichip3 will come up in the wrong mode and the Z80 will not function properly Therefore during RESET all the relevant chip enables must be pulled high and the 280 must be fed c
42. ceiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to identity and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington DC 20402 Stock No 004 000 00345 4 Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la class prescrites dans le Reglement sur le brouillage radio lectrique dict par le minist re des Communications du Canada Copyright 1999 Lexicon Inc All Rights Reserved Lexicon Inc e 3 Oak Park e Bedford MA 01730 1441 e Tel 781 280 0300 e Customer Service Fax 781 280 0499 Lexicon Part 070 14399 Rev 0 Printed in the United States of America MPX 500 Service Manual Read Instructions Read all safety and operating instruc tions before operating the unit Retain Instructions Keep the safety and operating instruc tions for future reference Heed Warnings Adhere to all warnings on the unit and in the operating instructions Follow Instructions Follow operating and use instructions Heat Keep the unit away from heat sources such as radia tors heat registers stoves etc including amplifiers which produce heat Ventilation Make sure
43. ed 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 Diagnostics ROM Test SRAM Test WCS Test INT Test ADF Test EEPROM Test DRAM Test Switch Test Encoder Test MIDI Test LCD Test Exit Test Init Burn Test When each of these tests are run they will display the test code and report an error the same way the Power Up Diagnostic did Unlike the power Up diagnostics however each can be chosen individually by turning the PROGRAM knob Once test is selected execution of the test is done by pressing the Program knob 5 3 MPX 500 Service Manual The table below displays each Extended Diagnostic test and the code the front panel will display before the tests are executed Test Test Number Name 1 02 SRAM 03 WCS 4 INT 95 26 EEPROM 97 DRAM 8 Switch 99 Encoder 1 2 3 4 5 6 7 8 9 e BYPAS S LED STORE LED 1 1 1 1 1 1 1 1 TAP LCD LED Display 11 12 13 14 15 ED E OFS EE HUE UM 0 Switch NE UN Fe ES 222022 ESSE D These tests reside the Power Up Diagnostics 2 Requires operator interaction and judgment Doesn t generate an error message Requires operator interaction
44. erify that the EEPROM has been initialized properly This is done by storing the software version of the EPROM in the first five bytes of the EEPROM Then the stored value is verified when the test is executed If the stored value read from the first five bytes of the EEPROM is incorrect the EEPROM will be initialized 7 DRAM Test The Z80 performs two tests to verify the DRAM a Data test and an Address test In the Data test the 280 writes AA hex 10101010 into all of the memory locations then reads them back to check them It repeats the process with 55 01010101 The Address test the 280 writes a count into the memory then reads it back 00000001 00000010 00000011 This test will take approximately 45 seconds to complete 8 Switch Test The Switch Test diagnostics has two tests The tests verify the operation of the Front panel switches 7 and Footswitches 2 along with their associated LEDs at the same time The LCD Display will also indicate the name of the switch being pressed 4 held Footswitches To perform this test a Dual stereo style footswitch must be plugged into the Footswitch jack on the back of the MPX 500 using 74 tip ring sleeve cable Press the LEFT FOOTSWITCH Ring The BYPASS LED will light and the LCD Display will indicate 5 5 MPX 500 Service Manual BYPASS The remaining LEDs will be off When the LEFT FOOTSWITCH released the BYPASS LED will go off Press the RIGHT FO
45. erous voltage Terminals fed from the interior by voltage exceed ing 1000 volts must be so marked The WARNING sign denotes a hazard It calis attention to a procedure practice condition orthe like which if not correctly performed or adhered to could result in injury or death to personnel The CAUTION sign denotes a hazard It calis attention to an operating procedure practice condition orthe like which if not correctly performed or adhered to could result in damage to or destruction of part or ali of the product The NOTE sign denotes important infor mation it calls attention to procedure practice condition or the like which is essential to highlight NOTE CAUTION Electrostatic Discharge ESD Precautions The following practices minimize possible damage to ICs resulting from electrostatic discharge or improper inser tion Keep parts in original containers until ready for use e Avoid having plastic vinyl or styrofoam in the work area Wear an anti static wrist strap Discharge personal static before handling devices Remove and insert boards with care When removing boards handle only by non conduc tive surfaces and never touch open edge connectors except at a static free workstation Minimize handling of ICs Handle each IC by its body not slide ICs or boards over any surface Insert ICs with the proper orientation and watch for bent pins on ICs
46. ervice beyondthat described in the operating instructions Flefer all other service needs to qualified service personnel Safety Suggestions Damage requiring service The unit should be serviced by qualified service personnel when the power supply cord or the plug has been damaged objects have fallen or liquid has been spilled into the unit the unit has been exposed to rain the unit does not appear to operate normally or exhibits a marked change in performance the unit has been dropped or the enclosure damaged Outdoor Antenna Grounding If an outside antenna is connected to the receiver be sure the antenna system is grounded so as to provide some protection against voltage surges and built up static charges Section 810 of the Na tional Electrical Code ANSI NFPA No 70 1984 provides information with respect to proper grounding of the mast and supporting structure grounding of the lead in wire to an antenna discharge unit size of grounding conductors loca tion of antenna discharge unit connection to grounding electrodes and requirements for the grounding electrode See figure below Power Lines An outside antenna should be located away from power lines Antenna Lead in Wire Ground Clamp Antenna Discharge Unit NEC Section 810 20 Electric Service Equipment Grounding Conductors NEC Section 810 21 Ground Clamps Power Service Grounding Elect
47. he Low pass filters on the Analyzer 30kHz 20 2 12 Verify the Noise level at the Right Output is gt 97dBr 101 dBr typical Repeat Tests 48K Select Internal 48k Clock Source from System mode and repeat all of the above tests Digital Functionality This test will verify that the MPX 500 will pass a valid S PDIF digital audio signal through its digital input and output circuitry 4 2 Lexicon 1 Connect a Digital signal CD player DAT or effects box to the S PDIF input jack on the back of the MPX 500 2 Connect the S PDIF output of the MPX 500 to a D A device M300 for conversion back to an analog signal 3 Connect the analog output of the D A device M300 to your amplifier with speaker output Be sure to turn the volume down on the amplifier 4 Turn the volume up on your amplifier to a comfortable listening level and verify audio at the output and that it is free and clear of any audio defects pops clicks static etc MIDI Functionality This test will verify that the MIDI Input and MIDI Output Thru circuits are working The test will transmit data out of the MIDI OUT jack and will attempt to read the data through the MIDI IN jack Midi functionality is tested through the extended diagnostics of the MPX 500 To enter the Extended Diagnostics power on the unit while pressing down 4 holding the BYPASS button on the front panel of the MPX 500 When the EDIT LED is lit the BYP
48. he MPX 500 s audio input and output circuitry Analog In To Analog Out Level Test 1 Apply 1kHz sinewave signal to the MPX 500 Left Input 1 946 Vrms 2 Adjust the Input Trim knob and measure the output for a level between 15 46 and 13 78Vrms 3 Move the cables to the Right Input Output connections and repeat step 2 Frequency Response Test These tests will verify the frequency response specifications of the Left and Right analog inputs to the Left and Right analog output signal paths of the MPX 500 Analog In To Analog Out Frequency Test 1 Disable all Filters on the Distortion Analyzer 2 Apply a 1kHz sinewave signal to the MPX 500 Left Input 3 083Vrms 4 1 MPX 500 Service Manual Connect the Left Output to the Distortion Analyzer Set the Analyzer for a reference 1kHz Sweep the Oscillator from 20Hz to 20kHz and verify the level to be within 1 0dBr through out the sweep 6 Move the cables to the Right Input Output connections and repeat step 4 4 5 BO THD N Test These tests will verify the THD N specifications of the MPX 500 s Left and Right input to output circuitry Analog In To Analog Out THD N Test Apply 1kHz sinewave signal to the MPX 500 Left Input 6 904 Vrms Connect the Left Output to the Distortion Analyzer Set the Distortion Analyzer to measure THD Enable the Low pass filters on the Analyzer 30kHz 20kHz Verify the Left output Noise level on the Analyzer is
49. he RIGHT FOOTSWITCH TIP The TAP LED will light and the LCD Display will indicate The remaining LEDs will be off When the RIGHT FOOTSWITCH released the TAP LED will go off To exit the test press the Program Knob 4 3 MPX 500 Service Manual Listening Test Setup 1 Connect an audio cable between the output of the Low Distortion Amplifier and the MPX 500 Left and Right Inputs 2 Connect two audio cables between the headphone amplifier inputs and the MPX 500 Left and Right outputs 3 Set the headphone amplifier volume control to its lowest level 4 Set the oscillator for 220Hz sinewave at 100mVrms 5 Power on the MPX 500 and turn the program knob to the 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 Puton headphones and set 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 one side of the MPX 500 four inches off the work surface and drop 2 Verify that no audio or display intermittence is caused by this action NOTE To prevent damaging the unit keep one side of the unit touching the work surface at all times Lexicon AZEZET 001 A22 01 7001 7600 7001 1005 01 4001 4005 01 4001 ALE ZZ 001 7600 7001
50. internal adjustments must be made by qualified maintenance personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power and discharge circuits before touching them DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the instrument DANGEROUS PROCEDURE WARNINGS Warnings such as the example below precede potentially dangerous procedures throughout this manual Instructions contained in the warnings must be followed Dangerous voltages capable of causing death are pres ent in this instrument Use extreme caution when han dling testing and adjusting CAUTION Notch ICs inserted backwards will be destroyed incorrect insertion of ICs is also likely to Pin P 4 cause damage to the board General definitions of safety symbols used on equipment or in manuals CAUTION SAFETY SYMBOLS instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect against damage to the instrument indicates dang
51. iometer R2 adjusts the LCD contrast The front panel LED s on the SW 1 and SW 2 boards are controlled by software 018 74AC273 and associated current limiting resistors For information on LCD PDF ftp wfp62508 w1 com s150gs32 paf Sheet 7 POWER SUPPLY This sheet shows the power supply reset generator and their associated circuits The Reset generator is formed by two sections of U3 74HC132 along with C11 22uF and R16 1K RESET is held low during initialization immediately after power is applied Main power is applied to IEC connector J1 The MPX500 incorporates a switching power supply module which accepts main voltages from 90 240V AC The power switch on front panel is in series with the main input to the power supply module The supply delivers 15VDC and 5VDC which is conditioned by capacitors resistor and chokes shown Additional Sheets 1 each SW 1 SW 2 SW 1 incorporates 4 LED s 4 switches and encoder SW5 which connect to the MAIN board J18 SWS 24 position rotary encoder which includes a push action switch used to access the bank function in system SWA 2 incorporates 2 LED s and 2 switches wired to the MAIN board via J20 6 3 Chapter 7 Parts List MPX500 MAIN BOARD ASSEMBLY PART DESCRIPTION QTY 120 14142 ADHESIVE EPOXY THERMAL 200 14153 POT RTY 10KB KNURL 6MMX15MML 1 00 200 14157 POT RTY 10K15CX2 7MMFL 14 15L 1 00 202 09794 55 0 0805 4
52. ion describes a quick verification of the operation of the MPX 500 and the integrity of its analog and digital audio signal paths Diagnostics The MXP 500 contains two types of Diagnostics Power Up Diagnostics and Extended Diagnostics Each of these will be described fully in Chapter 5 Troubleshooting When the MPX 500 is powered on the Power up Diagnostics run automatically to verify proper operation of its internal systems The Power Up Diagnostics consist of the following tests ROM Test SRAM Test WCS Test INT Test ADF Test EEPROM Test Setup 1 Turn on the MPX 500 and wait for the Power Up Diagnostics cycle to finish 2 Enter System Mode by pressing the System button 3 Use Edit Knob 1 to select the following System Parameters and Edit Knob 3 to set the parameter as noted 3 1 Output Level OdB 3 2 Input Source Analog Stereo 3 3 Clock Source Internal 44 1k 3 4 Bypass Mode Dry 4 Press the System button 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 Vrms 10 Turn the Input Trim knob fully clockwise VO Tests These tests will verify the audio performance of t
53. l is demodulated by digital audio receiver CS8412 014 which delivers a serial stream in 125 format to the Lexichip3 The signals CA CB CC CD CE and ERF allow software to determine the lock error status and sample rate detected by U14 CK 6MHZ provides a reference clock used by 014 to determine incoming sample rate For information on CS8412 http www cirrus com products overviews Product data sheet PDF http www cirrus com ftp pubs Sheet 6 DISPLAY DRIVER This sheet shows the footswitch jack LCD connection LCD contrast led driver SW 1 and SW 2 connections and their associated circuits The tip and ring of the footswitch 74 phone jack J4 connect to TAP FOOT_BYPASS respectively through current limiting resistors R11 and R12 Capacitors C5 and C6 filter out RFI D10 and D11 help protect from over voltage or static discharge Pull up resistors R100 and R101 default the non active switch state to logic high FOOT TAP and FOOT BYPASS are fed to 74HC541 019 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 interface to the front panel LCD module R102 112 are series damping resistors for the LCD address control and data lines 10K potent
54. locks to allow the resistors to work as designed Proper initialization of the system is dependent on the static state of the data bus on power up which is provided by R115 122 and on the default state of other lines governed by R10 R17 R23 24 R80 81 R54 56 R95 R76 R114 Be sure to check these and clocks if the system will not come up The 280 013 handles all basic system control and user interface operation Normally the 280 clock ZCLK is derived from the Lexichip3 M_ZCLK pin via GAL U20 sheet 5 However when RESET is asserted before the Lexichip3 is functioning the GAL feeds ZCLK from the 12 288 2 crystal oscillator The Lexichip3 master clock pin 75 is driven by 256F S48 from the 12 288MHz crystal oscillator sheet 5 All the system software and programs are stored in 256Kx8 EPROM U9 The Z80 s memory is a 32Kx8 SRAM U2 User programs are stored in a 4kx8 EEPROM U5 The EEPROM clock is driven by the Lexichip3 under program control The serial data line EEPROM DATA is bi directional R22 prevents excessive current in either the EEPROM or the Lexichip3 during power up when both chips might drive the line The audio memory for the Lexichip3 is provided by 1Mx4 DRAM U6 Note that all address decoding RAM ROM EN etc is done within the Lexichip3 That is the primary reason the 280 cannot function if the Lexichip3 is improperly initialized at the rising edge of RESET Sheet 4 ENCODERS This
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57. ndicate the Pass Fail status i e EDIT 2 PASS Confirm and proceed to test the next encoder Turn the EDIT 3 encoder Clockwise CW one revolution 16 positions The LCD Display will momentarily indicate the Pass Fail status i e EDIT 3 PASS Confirm and proceed to test the next encoder Turn the EDIT 4 encoder Clockwise CW one revolution 16 positions The LCD Display will momentarily indicate the Pass Fail status i e EDIT 4 PASS Confirm and proceed to test the next encoder Turn the PROGRAM encoder Clockwise CW one and one half revolutions 32 positions The LCD Display will indicate the Pass Fail status i e PROGRAM PASS Pressing the BANK button PROGRAM knob will exit the test The LCD Display will momentarily indicate Done then return to the Extended Diagnostics 10 MIDI Test This test will verify that the MIDI Input and MIDI Output Thru circuits are working The test will transmit data out of the MIDI OUT jack and will attempt to read the data 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 executed the LCD Display will indicate the
58. on PROGRAM knob The LCD Display will indicate BANK The remaining LEDs will be off When the BANK button PROGRAM knob released the LCD Display will indicate Done 9 Encoder Test During this test the Z80 microprocessor reads the value of the encoder being tested and then expects the next value read from the encoder when the encoder position is moved will be at a predetermined incremental value Therefore during the test each encoder must be rotated in a clockwise direction as it is being tested or the test will fail When the test is executed all front panel LEDs will be turned off and the LCD Display will indicate the encoder that is under test along with the hexadecimal value of the encoder s current position The hexadecimal values range from 0 F for the EDIT 1 4 encoders and from 00 1F for the PROGRAM encoder The encoders are tested in the following sequence EDIT 1 EDIT 2 EDIT 3 EDIT 4 and PROGRAM When the test is executed the LCD Display will indicate in the lower left corner the encoder under test EDIT 1 XX along with the hexadecimal value of the encoder s current position Turn the EDIT 1 encoder Clockwise CW one revolution 16 positions The LCD Display will momentarily indicate the Pass Fail status i e EDIT 1 PASS Confirm and proceed to test the next encoder 5 6 Lexicon Turn the EDIT 2 encoder Clockwise CW one revolution 16 positions The LCD Display will momentarily i
59. rode System NEC National Electrical Code NEC Art 250 Part H 1 25 22 MPX 500 Service Manual SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere inthese instructions violates safety standards of design manufacture and intended use of the instrument Lexicon assumes no liability for the customer s failure to comply with these requirements GROUND THE INSTRUMENT To minimize shock hazard the instrument chassis and cabi net must be connected to an electrical ground The instru ment is equipped with a three conductor AC power cable The power cable must either be plugged into an approved three contact electrical outlet or used with a three contact to two contact adapter with the grounding wire green firmly connected to an electrical ground safety ground at the power outlet The power jack and mating plug of the power cable meet international Electrotechnical Commission IEC safety standards DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes Operation of any electrical instrument in Such an environment constitutes a definite safety hazard KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and
60. rts When ordering parts identify each part by type price and Lexicon Part Number Replacement parts can be ordered from LEXICON INC 3 Oak Park Bedford MA 01730 1441 Telephone 781 280 0300 Fax 781 280 0499 email ATTN Customer Service Returning Units to Lexicon for Service Before returning a unit for warranty or non warranty service consult with Lexicon Customer Service to determine the extent of the problem and to obtain Return Authorization No equipment 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 possible properly insured consigned prepaid to a reliable shipping agent When returning a unit for service please include the following information Name Company Name Street Address City State Zip Code Country Telephone number including area code and country code where applicable Serial Number of the unit Description of the problem Preferred method of return shipment Return Authorization on both the inside and outside of the package Please enclose a brief note describing any conversations with Lexicon personnel indicate the name of the person at Lexicon
61. that the location or position of the unit does not interfere with its proper ventilation For example the unit shouid not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in acabinet which impedes the flow of airthrough the ventilation openings Wall or Ceiling Mounting Do not mount the unit to a wall or ceiling except as recommended by the manufacturer Power Sources Connect the unit only to a power supply of the type described in the operating instructions or as marked on the unit Grounding or Polarization Take precautions not to defeat the grounding or polarization of the unit s power cord applicable in Canada Power Cord Protection Route power supply cords so that they are not likely to be walked on or pinched by items placed on or against them paying particular attention to cords at plugs convenience receptacles and the point at which they exit from the unit Nonuse Periods Unplug the power cord of the unit from the outlet when the unit is to be left unused for a long period of time Water and Moisture Do not use the unit near water for example near a sink in a wet basement near a swimming pool near an open window etc Object and liquid entry Do not allow objects to fall or liquids to be spilled into the enclosure through openings Cieaning The unit should be cleaned only as recommended by the manufacturer Servicing Do notattempt any s
62. the LEDs before each test 15 executed By displaying a test error code on the LEDs before the test 15 activated it will be easier to determine which test failed if the unit hangs or crashes during the Burn In loop The test numbers and names are also displayed on the LCD Display along with the Pass Fail status of each test When the test is executed the LCD Display will 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 Test c Store Tap Number Name LED LED CREE LED E END ESA 594 OA ___ JN E rer General Troubleshooting and Service Notes Power Supply CAUTION There is no protective paper covering power supply IEC connector or power switch leads Beware of exposed line voltages e The power supply module should not be repaired The entire module should be replaced if failure occurs Front Panel Knobs e ltis difficult to remove knobs on the front panel without causing damage to the either the knobs or front panel Extra knobs should be kept on hand for repair needs Lexichip Replacement e Lexichip requires a heatsink that is installed with a thermal epoxy The parts list contains the P N for replacement heatsinks and the proper adhesive Keep replacement heatsinks and adhesive on hand for repairs Adhesive should be epoxy thermally conductive and equivalent to e
63. with the 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 Os 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 at the proper time intervals The Lexichip 3 does this by providing this signal to the Z80 s maskable interrupt line If the 280 sees the signal at the proper times the test will pass 5 ADF Test This test will verify that the Audio Data File in the Lexichip 3 is working properly The Lexichip 3 Audio Data File ADF is a fast synchronous 128 word SRAM that provides audio data buffering and storage for external memory references Serial I O and the Host to Lexichip data port ADF locations also function as ARU Registers and as scratchpad memory 6 EEPROM Test This test has 2 parts that will verify the functions of the EEPROM in the MPX 500 The EEPROM will be initialized if either of the two parts of the test fail The First part of the 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 v
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