Lexicon MC-1 Service Manual Download Page 33 | Manualshive

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Lexicon

5-11

Assembly / Disassembly

1. Remove the three- (3) screws, which hold the top cover to the unit to top of the back pane.
2. Next remove the four (4) screws that hold the 2 back plates on each side of the rear panel.

The top cover fits tightly into groves on either side of the side panels of the MC-1 and is removed by being
pulled out carefully from the back of the unit. Once you have a grip on it hold the front of the MC-1 with one
hand and slide the cover off with the other.

Initial Inspection

1.  Inspect the MC-1 for obvious signs of physical damage.
2.  Verify that all switches operate smoothly
3.  Verify that all socketed ICs are correctly seated.
4.  Verify that all ribbon cables are correctly installed and secured.
5.  Check for burnt or obviously damaged components.

WARNING

CAUTION

As the following

cover, it is imperative that these tests be performed with
regard to all safety and ESD precautions.

!

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Summary of Contents for MC-1

Page 1: ...MC 1 Digital Controller Service Manual ...

Page 2: ...nance Instructions in this accompanying literature 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 It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifica...

Page 3: ...or polarization of the unit s power cord Not 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 i...

Page 4: ...MC 1 Service Manual ...

Page 5: ... Input to Composite Monitor Records 1 and 2 Outputs Tests 4 5 S Video Input to S Video Monitor Records 1 and 2 Outputs Tests 4 6 Expansion Port Digital Input to Analog Output Test 4 6 Setup 4 7 Test 4 7 Digital Output Test 4 7 Setup 4 7 Test 4 8 Lexicon Audio Precision ATE Summary 4 9 Chapter 5 Troubleshooting 5 1 V4 Release Notes 5 1 V1 00 bug descriptions 5 1 Diagnostics 5 1 Diagnostic Reporting...

Page 6: ...SEMBLY 6 4 MC1 VIDEO BOARD ASSEMBLY 6 4 MC1 RCA BOARD ASSEMBLY 6 6 MC1 ENCODER BOARD ASSEMBLY 6 6 MC1 IR BOARD ASSEMBLY 6 6 MC1 POWER SWITCH BOARD ASSEMBLY 6 6 DTS BOARD ASSEMBLY 6 6 MC1 CHASSIS MECHANICAL 6 7 MC1 PACKAGING MISCELLANEOUS 6 8 MC1 POWER CORDS 6 8 MC1 RACK MOUNT OPTION 6 8 Chapter 7 Drawings 7 1 Schematics 7 1 Drawings 7 1 ...

Page 7: ...with RCA plugs on both ends for connecting the outputs of the Disc player to the digital Coax 1 input of the MC 1 2 single ended shielded audio cables with RCA plugs on both ends for connecting the outputs of the Disc player to the inputs of the MC 1 2 single ended shielded audio cables with RCA plugs on one end and appropriate connectors on the other end to the input of the stereo amplifier Audio...

Page 8: ...Service Manual DMM Digital Multi Meter 3 1 2 digit with 0 5 accuracy 1 variable AC supply 2 amp minimum 1 digital multimeter DMM 3 5 digital 0 5 or better accuracy 1 frequency counter with a 7 digit accuracy ...

Page 9: ...No equipment will be accepted without Return Authorization from Lexicon If Lexicon recommends that a MC 1 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 possib...

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Page 11: ...t Level 2 Vrms for maximum output with Input Gain 0dB 200mVrms for Dolby Level Input Impedance 100 kΩ in parallel with 150pF Output Level 6 Vrms System Volume 12dB Output Imepdance 100Ω in parallel with 150pF Video NTSC M PAL and SECAM compatible Output Level 1 0 V peak to peak Impedance 75Ω Input Return Loss 40dB Differential Gain 0 5 Differential Phase 0 5 Frequency Response 10 Hz to 10 MHz 0 1d...

Page 12: ......

Page 13: ...tening level for the speaker 7 Sweep the oscillator from 20Hz to 20kHZ you should hear clean audio coming from both speakers 8 Power off the amplifier and move the cables from the Front Left Right outputs to the Center left and Subwoofer right outputs Repeat the oscillator sweep again checking for clean audio from the speakers Repeat this step for the remaining outputs on the MC 1 9 In order to te...

Page 14: ...ional and that the MC 1 meets published specifications These tests verify the functionality of all main audio paths The performance of the A D and D A conversion circuitry are checked through gain frequency response THD N and S N Ratio tests Input to Record Outputs Test Setup 1 Attach the audio input cable between the Low Distortion Oscillator and the MC 1 Left VCR input 2 Attach the audio output ...

Page 15: ...lay will read AUDIO Test 5 Press and hold the Shift button on the remote then press the Off button The 99 will then be displayed next to AUDIO Test 6 Press and hold the RECORD button on the remote then the VCR button The 53 will then be displayed This confirms the VCR input is now set to the ZONE 2 outputs Tests 1 Apply a 1kHz signal 12dB 4 Vrms to the input channel 2 Set the scale on the Distorti...

Page 16: ...ence to check frequency response 9 Turn the filter off Next sweep the oscillator frequency from 10Hz to 20kHz 10 Verify that the signal level is within 0 2 0 3dB of reference level over the frequency band 11 Set the scale on the Distortion Analyzer to measure 100dBr signal level with the filter on Turn off the oscillator to the MC 1 and verify a noise level measurement less than 105dBr 12 Swap the...

Page 17: ...tended Diagnostics appears n the display 4 Press the TV button on the remote to select the VIDEO Test Press and hold Shift then press the ON button This will set the MC 1 to except an external video source for testing 5 Turn on the video source and monitor Tests 1 To test the VCR Composite input to Video Monitor Composite output path press the VCR button on the remote The 13 will appear next to th...

Page 18: ... the VCR input to the DVD input Press the DVD button The 21 will appear confirming this video path is set 6 Repeat steps 2 4 7 To test the remaining S Video inputs move the video cable to the next S Video input and press the corresponding buttons to set up the video paths Below are the buttons and code s for each video input Dolby Digital 20 VCR input THX 21 DVD input Logic 7 22 V DISC input DTS 2...

Page 19: ...ress play on the audio source and again as in step one listen for any anomalies 6 Pause the audio once more Disconnect the RCA connection to the B Expansion Port and connect it to the C Expansion Port 7 Move the Center Sub connectors to the Side Left Right outputs 8 Press play on the audio source and again as in step one listen for any anomalies 9 Pause the audio once more 10 Move the Side Left Ri...

Page 20: ... Manual 4 8 Test 1 With the audio source playing slowly increase the volume level on the amplifier to a comfortable listening level and verify that the outputs are free from noise distortion or any other anomalies ...

Page 21: ...hiftCD 2 CH JITTER44 1dBFS 1dBFS 10 000 THD N 0 003 0 008 0 0002 10 22K COAX5 1 ShiftCD 2 CH DIGD_R 60dBFS 60dBFS 997 dBr AMPLITUDE 103 99 94 120 10 22K COAX5 1 ShiftCD 2 CH DIGFREQ 1dBFS 1dBFS 10 20K dBr AMPLITUDE 0 0 26 0 36 10 22K COAX5 1 ShiftCD 2 CH DIGGAN44 1dBFS 1dBFS 997 Vrms AMPLITUDE 7 1 7 66 6 54 10 500K OPTIC1 1 ShiftCD PARTY DIG997 1dBFS 1dBFS 997 THD N 0 003 0 005 0 0002 10 22K OPTIC...

Page 22: ...FS 1dBFS 997 Vrms AMPLITUDE 7 1 7 66 6 54 10 500K OPTIC2 1 ShiftAUX TVM JITTER48 1dBFS 1dBFS 10 000 THD N 0 003 0 008 0 0002 10 22K OPTIC2 1 ShiftAUX TVM DIGGAN48 1dBFS 1dBFS 997 Vrms AMPLITUDE 7 1 7 66 6 54 10 500K OPTIC3 1 ShiftAUX MUSIC JITTER48 1dBFS 1dBFS 10 000 THD N 0 003 0 008 0 0002 10 22K OPTIC3 1 ShiftAUX MUSIC ...

Page 23: ...s Diagnostics There are two sets of MC 1 Diagnostics Power On Diagnostics and Extended Diagnostics The Power On Diagnostics are automatically executed each time power is applied to the MC 1 via the rear panel power switch Extended Diagnostics are not automatically executed but can be invoked by the user for specific purposes Extended Diagnostics include additional tests to verify front panel contr...

Page 24: ...ing the test loop and reporting the failure once during the loop the LEDs on time is reduced This results in the LEDs flickering and is normal operation Serial Debug Pot The Serial Debug Port is available to provide diagnostic status to be viewed on an external PC through one of the serial ports on the PC On the rear of the MC 1 is a 5 pin din connector Pin 4 of the connector is wired to the seria...

Page 25: ...ed Enter Extended Diagnostics When power is applied to the MC 1 the VFD and the front panel LEDs are lit for 3 seconds To enter extended Diagnostics press and hold down on the front panel the REC ZONE2 and EFFECT buttons until the end of the 3 second interval The VFD will indicate Extended Diagnostics Alternatively during the interval press and hold SELECT on the remote until Extended Diagnostics ...

Page 26: ... Diagnostics A signal error log entry is made each time the MC 1 is powered up a diagnostic test is executed and a failure encountered E1 Z80 CPU Test This test verifies operation of the internal Z80 registers The test requires that the address data and control busses from the Z80 and the EPROM be operational After disserting interrupts and sending the test number to the front panel LEDs the Z80 a...

Page 27: ... next then a 2 etc This repeats this until the entire section of the WCS memory is tested The data write and read test writes and reads the memory with 55h AAh FFh 00h 01h 02h 04h 08h 10h 20h 40h 80h FEh FDh FBh F7h EFh DFh BFh and 7Fh The last 16 patterns shift 1 s and 0 s through the memory locations E7 Lexichip II DRAM Test This test uses a counter test and a single data write and read test A s...

Page 28: ... on the rear panel of the MC 1 labeled RS232 Once this is installed power cycle the MC 1 and verify the following message is displayed on the top half of the VFD about 20 seconds after power up SERIAL PORT A PASSED This message is displayed for about 2 seconds before entering normal operating mode If the message isn t displayed the test failed To troubleshoot this type of failure use the front pan...

Page 29: ...then pressing the MUTE F P button returns the user to the diagnostic menu Pressing the SHIFT DONE remote key combination returns the user to the top of the EXTENDED DIAGNOSTICS menu Pre Burn in Tests The Pre burn in tests are a group of tests that are almost identical to the Power On Diagnostic tests but with more allotted to fully evaluate functionality the Lexichip DRAM memory test The following...

Page 30: ...ed to change the character The test has sufficient variation of characters to verify complete functionality of the display The FAT Procedure requires that 3 characters capital A capital B and a variation of the symbol be observed on the VFD Block Test The combination of the Character Test and the Block Test verifies that all display segments are functioning The Block Test illuminates all pixels on...

Page 31: ...of the chip are operational First the 56004 is reset and after it comes out of reset the test program is loaded The 56004 has internal ROM so if it comes out of reset it has booted and completed its internal boot program This indicates that a fair amount of its internal circuitry is working Then test data patterns are sent via SER_CTRL_DATA pin 15 of the connector and read back via SER_RETURN_DATA...

Page 32: ...t This test configures the MC 1 to pass audio data through the A D DSP and D A circuitry without any DSP effects processing This test is utilized to verify the audio specifications and allows an MC 1 to emulate Audio Precision ATE testing on the bench for the purpose of debugging failures The audio test modes allow for operating the hardware at a basic level for proving the functionality of indivi...

Page 33: ... the back of the unit Once you have a grip on it hold the front of the MC 1 with one hand and slide the cover off with the other Initial Inspection 1 Inspect the MC 1 for obvious signs of physical damage 2 Verify that all switches operate smoothly 3 Verify that all socketed ICs are correctly seated 4 Verify that all ribbon cables are correctly installed and secured 5 Check for burnt or obviously d...

Page 34: ...ing and continuity at all points Verify that the 5VD supply is operational and within specification Check the distribution of the supply to ensure that power is reaching the appropriate front panel boards Switch Encoder and LED problems If only one front panel control is failing then the problem is properly a bad switch encoder or LED For problems specific to the front panel power switch or volume...

Page 35: ...ame way at the same time is remote The problem is likely to be with a component or components common to all channels Another likely cause is a defective power supply Verify that the power supplies are operational and within specification No Output If there is no output from only one channel the problem can easily be traced by comparing the signals at various points along the analog signal path wit...

Page 36: ...ocate U72 SRAM on the Right side of the Main Board With a DVM meter place the black lead on the chassis and place the Red lead on the far Left pin of U72 Verify the voltage is 2 50 VDC Main Board Supply Rail Tolerance Location 5 VD 4 94 5 26 Front Left corner near Red wires soldered at J26 15 V 15 00 16 95 Located test points marked 15V on the Main board just above U65 right side middle on the boa...

Page 37: ...ding on application Trigger Output Voltages 5V 12V Jumpers to be used for Power On PWR W1 2 W1 2 Pins 1 2 2 3 Jumpers to be used for Programmable W3 4 W3 4 Pins 1 2 2 3 The voltage and amp specifications for both voltages are as follows below Configuration Voltage Spec Max Iout 5 V Regulated 5 500mA 12V Regulated 5 500mA Video Subcarrier Calibration Calibration Procedure 1 Enter the MC 1 into Exte...

Page 38: ... PRESET MENU EXIT RESTORE DEFAULTS If you want to resume normal operation without restoring all defaults this is your last chance Use MENU or to highlight EXIT then press Select To restore defaults use MENU or to highlight RESTORE DEFAULTS then press Select This will clear and reload all preset effects and all factory settings of Volume Balance Contrast Speaker Configuration etc When the message F...

Page 39: ...88 218 202 10573 RESSM RO 5 1 10W 470K OHM 4 R194 197 202 10574 RESSM RO 5 1 10W 10M OHM 2 R14 272 202 10585 RESSM RO 5 1 4W 51 OHM 5 R42 210 213 202 10586 RESSM RO 5 1 4W 100 OHM 26 R43 44 68 69 92 93 R116 117 144 146 R157 172 202 10597 RESSM RO 5 1 10W 180 OHM 3 R365 371 374 202 10598 RESSM RO 5 1 10W 330 OHM 4 R354 366 372 375 202 10599 RESSM RO 5 1 10W 3K OHM 2 R352 353 202 10836 RESSM RO 5 1 ...

Page 40: ...9875 CAPSM CER 1uF 50V Z5U 20 157 BC3 9 11 13 BC14 16 18 20 BC22 24 26 28 BC30 33 39 BC40 41 BC42 43 BC48 97 BC99A H BC100 109 BC110A B BC111 112 113 C9 10 12 14 16 19 C34 35 38 63 64 67 C92 93 96 121 122 C124 158 160 182 184 C188 189 199 224 225 C227 228 241 243 245 09876 CAPSM CER 01uF 50V Z5U 20 4 C23 24 234 235 245 09895 CAPSM CER 10pF 50V COG 10 2 C244 245 245 10452 CAPSM CER 390pF 50V COG 5 ...

Page 41: ...4 ICSM DIGITAL 74VHC157 SOIC 2 U11 12 330 12726 ICSM DIGITAL 74VHC14 SOIC 1 U60 340 00742 IC LINEAR 7805 LM 340 T 5 1 U47 340 01525 IC LINEAR 7905 5V REG 1 U46 340 10502 ICSM LIN LF353 DUAL OPAMP SOIC 3 U35 36 39 340 10550 ICSM LIN CS3310 VOL CTL SOIC 6 U15 19 23 27 31 32 340 10552 ICSM LIN MC33078 DU OPAMP SOIC 7 U16 20 24 28 30 U42 43 340 10567 ICSM LIN MC34164 5V MON SOIC 1 U45 340 12367 ICSM L...

Page 42: ...RO 5 1 4W 100 OHM 6 R6 8 10 12 14 26 202 11071 RESSM RO 5 1 4W 75 OHM 5 R7 9 11 13 15 203 10896 RESSM RO 1 1 10W 1 00K OHM 2 R30 34 203 11075 RESSM RO 1 1 10W 95 3 OHM 1 R19 203 11079 RESSM RO 1 1 10W 715 OHM 2 R20 21 241 11799 CAPSM TANT 4 7uF 6 3V 20 2 C33 39 244 12322 CAP MYL 047uF 50V RAD 5 BOX 2 C31 37 245 09875 CAPSM CER 1uF 50V Z5U 20 3 C6 8 245 09876 CAPSM CER 01uF 50V Z5U 20 11 C9 11 13 1...

Page 43: ...C 1uF 50V 20 5 5mmH 1 C65 240 11827 CAPSM ELEC 10uF 16V 20 6 C1 45 46 56 73 75 245 10416 CAPSM CER 1000pF 50V COG 5 2 C57 59 245 10544 CAPSM CER 220pF 50V COG 5 2 C55 62 245 10561 CAPSM CER 100pF 50V COG 5 4 C48 53 61 68 245 10588 CAPSM CER 33pF 50V COG 10 3 C50 51 66 245 10972 CAPSM CER 068uF 50V X7R 20 1 C63 245 10973 CAPSM CER 22pF 50V COG 5 1 C67 245 10975 CAPSM CER 3300pF 50V X7R 10 1 C64 245...

Page 44: ...2 09794 RESSM RO 0 OHM 0805 1 R36 202 09871 RESSM RO 5 1 10W 1K OHM 1 R45 202 09873 RESSM RO 5 1 10W 10K OHM 23 R12 19 21 35 37 R39 42 44 202 09897 RESSM RO 5 1 10W 470 0HM 2 R38 43 202 09899 RESSM RO 5 1 10W 47 OHM 17 R1 11 13 18 202 10558 RESSM RO 5 1 10W 47K OHM 1 R20 241 09798 CAPSM TANT 10uF 10V 20 1 C1 245 09105 CAPSM CER 027uF 50V X7R 10 43 C2 10 12 13 15 40 C42 45 48 49 245 09875 CAPSM CER...

Page 45: ... H S 1 DIG BD TO R PANL 3 R PANEL TO CHAS 4 DTS BD TO PS SUP 1 FAN TO PS SUP 2 DIG BD TO BRKT 2 RCA BD TO BRKT 2 640 10499 SCRW M3X8MM PNH PH BZ 8 HEATSINK TO MAIN 2 PWR SUP TO SUP 4 IR BD TO CHASSIS 2 640 12534 SCRW M3X20MM PNH PH BZ 2 FAN ASSY 641 01703 SCRW TAP AB 4X1 4 PNH PH ZN 5 MAIN BD TO CHASSIS SUPPORT 641 09699 SCRW TAP AB 2X5 16 PNH PH ZN 5 DIN TO R PANEL 1 DSPLY TO CHASSIS 4 641 10989 ...

Page 46: ... LABEL FUSE CAUTION F1 3 15A 1 PS SUPPORT 740 13282 LABEL DOLBY DTS LICENSE 1 CHASSIS BOTTOM 750 10983 BUTTON ASSY 30X 75 BLK 14 750 11396 PWR SUP 5V 3A 15V 40W 1 MC1 PACKAGING MISCELLANEOUS 070 13233 MANUAL THEORY DESIGN DC MC 1 070 13278 MANUAL OWNERS MC1 1 070 13279 GUIDE QUICK REF MC1 1 460 08345 BAT ALK AA 2 730 11280 BOX 20X5 75X17 5 1 730 11281 BOX 20 25X6X18 75 1 730 11388 INSERT CORR ACC ...

Page 47: ...M RCA EXP BD MC1 060 13589 SCHEM VIDEO BDs MC1 060 13087 SCHEM ENC BD MC1 060 13096 SCHEM IR BD MC1 060 13106 SCHEM PWR SW BD DC2 MC1 060 12228 SCHEM DTS BD DC 1 Drawings Component Layout 080 13042 ASSY DWG CHASSIS MC1 SDP3 080 13541 ASSY DWG DIG IN RCA EXP MC1 080 13043 ASSY DWG SHIPMENT MC1 SDP3 080 13281 ASSY DWG FAN MC1 ...

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Page 115: ...S ARE 1 10W 2 UNLESS OTHERWISE INDICATED RESISTORS ARE 5 3 UNLESS OTHERWISE INDICATED CAPACITORS ARE UF V C49 D1 FB3 J3 Q1 R45 U13 W3 SCHEM DTS BD DC 1 9 12 97 9 16 97 9 18 97 9 18 97 U6 256FS 3 B8 4 C4 256FS 4FS 3 B8 4 C4 4FS 4FS 64FS 2 B8 4 C4 AUDIO_IN 4 C4 SER_CTRL_DATA 2 C7 4 C4 SER_CTRL_CLK 2 C8 4 C4 ZORAN_CS 2 A6 ZORAN_RST 2 A6 2FS_DELAY1 2 C5 3 C8 128FS_DELAY1 2 C5 3 B8 AC3_AUDIO 2 A8 SER_R...

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Page 117: ... HOST_CTRL1 4 D4 HOST_CTRL1 HOST_CTRL0 4 C4 HOST_CTRL0 256FS 3 B8 4 C4 256FS DTS_AUDIO 3 B2 AC3_AUDIO 1 A2 SER_CTRL_CS 4 C4 56K4_HREQ 3 A2 FS 4 D5 GPIO 0 3 3 A5 GPIO1 GPIO0 128FS_DELAY1 128FS_DELAY1 1 A2 3 B8 2FS_DELAY1 2FS_DELAY1 1 A2 3 C8 AUDIO_OUT AUDIO_OUT 4 C6 HREQ 4 C6 HREQ 56K4_CS 3 C8 56K4_CS ZORAN_CS ZORAN_CS 1 C8 56K4_RST 56K4_RST 3 B8 ZORAN_RST ZORAN_RST 1 C8 56K9_HREQ 56K9_HREQ NC 56K9...

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Page 119: ... CW KB RWH 9 12 97 KB 4 060 12228 NOTES 56K4 ICE NOTE 1 PIN 1 2 NORMAL PIN 2 3 DEBUG 0 1 NOT INSTALLED W3 SCHEM DTS BD DC 1 9 16 97 9 18 97 9 18 97 R36 56K4_RST 2 A6 U13 NC 1 A8 2 A8 4 C4 256FS 256FS 1 B8 4 C4 4FS 4FS 56K9_SD1 2 C5 56K9_SD0 2 C5 128FS_DELAY1 1 A2 2 C5 2FS_DELAY1 1 A2 2 C5 FS 4 D5 2 C8 4 C4 SER_CTRL_CLK SER_CTRL_CLK 2 A6 56K4_CS 56K4_CS SER_CTRL_DATA SER_CTRL_DATA 2 C7 4 C4 DTS_AUD...

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Page 121: ...2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 027 50 027 50 5VD 5VD 1K 1N4002 2 1 KB 9 12 97 RWH KB CW 060 12228 4 0 BLACK RED FAN CONNECTOR SCHEM DTS BD DC 1 9 16 97 9 18 97 9 18 97 J2 HOST_CTRL1 2 A8 W2 FAN 2 A2 D1 R45 HOST_CTRL0 2 A8 SER_CTRL_CS 2 A8 SER_CTRL_DATA 1 C8 2 C7 3 C8 4FS 1 B8 3 B8 256FS 1 A8 2 A8 3 B8 FS 1 A8 2 A8 3 C8 SER_CTRL_CLK 1 C8 2 C8 3 C8 64F...

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Page 138: ...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 14397 Rev 0 Printed in U S A ...

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