Lexicon MC-1 Service Manual
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Lexicon MC-1 Service Manual

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  • Page 1 MC-1 Digital Controller Service Manual...
  • Page 2 Copyright © 1999-2002 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 # 070-14397 Rev 0 Printed in the United States of America...
  • Page 3 Lexicon Safety Suggestions Read Instructions Read all safety and operating Power Cord Protection Route power supply instructions before operating the unit. cords so that they are not likely to be walked on or pinched by items placed on or against them,...
  • Page 4 MC-1 Service Manual...

  • Page 5: Table Of Contents

    Test Equipment............................ 1-1 Chapter 2 General Information ..............2-3 Periodic Maintenance ..........................2-3 Ordering Parts ............................2-3 Returning Units to Lexicon for Service ....................2-3 Chapter 3 Specifications................3-1 Chapter 4 Performance Verification............4-1 Initial Inspection:............................4-1 Functional Tests: ............................. 4-1 Analog Input Test..........................
  • Page 6 MC-1 Service Manual Chapter 6 Parts List ..................6-1 MC1 MAIN BOARD ASSEMBLY......................6-1 MC1 DIGITAL INPUT BOARD ASSEMBLY .....................6-4 MC1 RCA EXPANSION BOARD ASSEMBLY ..................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...

  • Page 7: Chapter 1 Reference Documents, Required Equipment

    • 1 single-ended, shielded 75-ohm digital audio cable 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.
  • Page 8 MC-1 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: Chapter 2 General Information

    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.

  • Page 11: Chapter 3 Specifications

    Lexicon Chapter 3 Spec i fications Inputs Audio: 8 stereo (RCA) pairs Video: 8 composite (RCA), 8 S-video Digital: 8: 5 coaxial (RCA), 3 optical (TosLink), conforms to IEC-958, S/PDIF standards; 3 Expansion Ports for 960kHz, 24-bit PCM digital audio Outputs Audio: 8 main (RCA): Left, Center, Right, L&R Sides, Subwoofer...

  • Page 13: Chapter 4 Performance Verification

    Lexicon Chapter 4 Perfo r mance Verification This section describes a quick verification of the operation of the MC-1 and the integrity of its analog and digital audio signal paths. Initial Inspection: 1. Check each front panel switch for smooth mechanical operation and verify that the display acknowledges its functions.

  • Page 14: Audio Performance Verification

    MC-1 Service Manual 4. Connect the MC-1 Left /Right Front audio outputs to the amplifier Left / Right inputs and the outputs of the amplifier to a pair of speakers. 5. Slowly increase the volume level on the amplifier to a comfortable listening level and verify that the audio is free from noise, distortion, or any other audio irregularities.

  • Page 15: Input To Zone 2 Output Test

    13. Repeat steps 1 to 11 above for the Right ZONE 2 output. 14. To test the remaining inputs of the MC-1 to the ZONE 2 outputs, each path must be set with the remote control. Press and hold the ZONE 2 button, then press one of the analog input buttons to set up the next input to ZONE 2 output path.

  • Page 16: Main Audio Output Test

    Digital Input to Analog Output Tests This test verifies that all 8 digital inputs to an analog output of the MC-1 are functioning properly. It is important that all previous tests from this section be preformed prior to this test.

  • Page 17: Video Input / Output Tests

    TUNER: 0D TAPE: 0C 7. To test the Record Composite output port of the MC-1, switch the composite cable from the Composite Monitor output jack to the Composite Record output jack. 8. Select the MC-1's 8 composite inputs for the Composite Record output from the remote according to the table below.

  • Page 18: S-Video Input To S-Video Monitor / Records (1 And 2) Outputs Tests

    MUSIC: 27 (TAPE input) 8. To test the Record S-Video output port of the MC-1, switch the S-Video cable from the S-Video Monitor output jack to the S-Video Record output jack. 9. Select the MC-1's 8 S-Video inputs for the S-Video Record output from the remote according to the table below.

  • Page 19: Setup

    Lexicon If the MC-1 is currently in Extended Diagnostics, turn the unit off and on to bring it back to normal running mode. This test will confirm the MC-1 can pass a 44.1, 48, and 96kHz digital signal to the Analog outputs.

  • Page 20: Test

    MC-1 Service Manual 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: Lexicon Audio Precision Ate Summary

    This chart represents a summary of test Audio Precision test equipment settings and parameters used by Lexicon Manufacturing in production testing of all MC-1 product. This is provided as a reference and supplement to bench test settings found in the proof of performance in this manual.
  • Page 22 MC-1 Service Manual JITTER48 -1dBFS -1dBFS 10,000 THD+N 0.003 0.008 0.0002 <10-22K OPTIC1#1 ShiftAUX PARTY DIGGAN48 -1dBFS -1dBFS Vrms AMPLITUDE 7.1 7.66 6.54 <10>500K OPTIC2#1 ShiftAUX JITTER48 -1dBFS -1dBFS 10,000 THD+N 0.003 0.008 0.0002 <10-22K OPTIC2#1 ShiftAUX DIGGAN48 -1dBFS -1dBFS Vrms AMPLITUDE 7.1...

  • Page 23: Chapter 5 Troubleshooting

    MC-1. In normal use, the MC-1 is left connected to AC power and its operation is controlled by the front panel ON/STANDBY button or by the remote control. When controlled this way, Power On Diagnostics are not executed.

  • Page 24: Vfd Display

    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 serial debug port.

  • Page 25: Diagnostic Control/Interface

    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.
  • Page 26 Z80's internal registers. If a failure occurs the test will attempt to enter a loop to exercise the address, data and control lines. If the MC-1 is successful in getting into a test loop, there will be a short periodic pulse on the Serial Debug Port.
  • Page 27 VFD and verifying that the VFD asserts then desserts its busy status. The VFD memory test consists of writing 55h, and AAh, to the character generator memory and display memory space of the VFD and reading them back. After the MC-1 has passed the VFD Test, for the rest of the power on diagnostics, the VFD displays.

  • Page 28: Extended Diagnostics

    RS232 Wraparound plug is needed and must be installed at the female D9 connector (J2) 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.

  • Page 29: Pre-Burn In Tests

    Lexicon Diagnostic tests are selected by rotating the VOLUME knob, (front panel encoder), to display the desired test, or group of tests, on the VFD. The MUTE button is then pressed to execute the test. The group tests are those diagnostics where if a test passes, the diagnostic automatically executes the next test. The power on diagnostics is a group test.
  • Page 30 AC3 SPI Test The AC3 SPI Test requires that before powering on the MC-1 an AC3 board be installed. This test sends 81h to the Zoran DSP 38500 on the AC3 board. This instructs the 38500 to return the version encoded in its...

  • Page 31: Burn-In Loop

    This test initializes the entire SRAM. Upon completion of the test the MC-1 initiates Power On Diagnostics and returns to normal operation. All settings are then restored to their factory default values. Debugging Tests The following tests are designed to help isolate sections of the MC-1 circuitry to aid in fixing a failed unit...

  • Page 32: Troubleshooting Problems

    LOOP SPI (56004 Loop) Test The LOOP SPI Test allows one to take the 56004 out of the data path and verify if the problem in the MC-1 the 56004 or the supporting circuitry. To run the test, move jumper W5 to the TEST position, pins 2&3.

  • Page 33: Initial Inspection

    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.

  • Page 34: User Interface Problems

    Excessive ambient light conditions can also interfere with data transmission. In addition, a remote control held within a few inches of the MC-1 may not function properly, as the IR receiver can be overloaded at close distance.

  • Page 35: Video Problems

    Lexicon For example a bad capacitor may produce a high level of distortion and a frequency response problem. The frequency response problem would be easier to trace because the signal level can be monitored throughout the signal path on an ordinary oscilloscope.

  • Page 36: Power Supply

    MC-1 off and check the supply rails for shorts. 4. Use a DMM to measure all the power supply rails by using the MC-1 chassis ground as the 0VDC reference. Verify that all voltages are within the tolerance range shown below.

  • Page 37: Video Subcarrier Calibration

    2. Press TV on the remote to enter the Video Test 3. Pressing the Menu ∇ will set the MC-1 into this test. The output frequency at TP2 on the Video board is now at the NTSC standard calibration frequency.

  • Page 38: Restoring Defaults

    Turn off the MC-1 with the remote. Turn the MC-1 back on and immediately press and hold the Mute button on the remote. (Make sure you do not block the infrared receiver on the MC-1 front panel.) The on-screen...

  • Page 39: Chapter 6 Parts List

    Lexicon Chapter 6 Parts List MC1 MAIN BOARD ASSEMBLY PART NO DESCRIPTION REFERENCE 202-09794 RESSM,RO,0 OHM,0805 R230,277,279,314 R323,326,328,329 202-09795 RESSM,RO,5%,1/10W,2.2K OHM R6,224,331-334,347 R360-362,367 202-09871 RESSM,RO,5%,1/10W,1K OHM R1,7,45,226-228 R249-254,287,289 R364,369,373 202-09873 RESSM,RO,5%,1/10W,10K OHM R46,67,70,91,94,115 R118,139,141,143,145 R147,199,201,221,223 R257,265,273,275 R286,290-297 202-09894 RESSM,RO,5%,1/10W,1M OHM...
  • Page 40 MC-1 Service Manual PART NO DESCRIPTION REFERENCE 203-13134 RESSM,THIN,1%,1/10W,1.00K OHM R154,155,189-192 203-13537 RESSM,THIN,1%,1/10W,5.62K OHM R203,205 240-07335 CAP,ELEC,47uF,25V,RAD,NON-POL C28,29,36,37,57,58 C65,66,86,87,94,95 C115,116,123,126 C146,147,150,151,154 C155,178,179,186,187 240-09786 CAP,ELEC,100uF,25V,RAD,LOW ESR C27,218,219,238,246 240-10758 CAPSM,ELEC,1uF,50V,20%,5.5mmH C236 240-12330 CAPSM,ELEC,2.2uF,35V,20% C13,15,212 240-13216 CAPSM,ELEC,22uF,16V,20% C3,4 240-13217 CAPSM,ELEC,47uF,16V,20% C190,191 241-09366 CAPSM,TANT,10uF,25V,20%...
  • Page 41 Lexicon 300-10564 DIODESM,SCHOTTKY,LOW VF,SOT23 310-10510 TRANSISTORSM,2N3904,SOT23 Q3,4,8 310-10565 TRANSISTORSM,2N3906,SOT23 Q2,5,6,9,11,12 310-10566 TRANSISTORSM,2N4401,SOT23 330-09239 ICSM,DIGITAL,74HC74,SOIC U55,81,101 330-09350 IC,DIGITAL,LEXICHIP 2 U110 330-09796 ICSM,DIGITAL,74AC00,SOIC 330-09797 ICSM,DIGITAL,74AC04,SOIC U104 330-09877 ICSM,DIGITAL,74HC174,SOIC U111,112 330-09884 ICSM,DIGITAL,74AC32,SOIC U80,85 330-09885 ICSM,DIGITAL,74AC74,SOIC U4,86,103 330-09888 ICSM,DIGITAL,74ACT153,SOIC U48,49 330-10372 ICSM,DIGITAL,74HC574,SOIC 330-10417 ICSM,DIGITAL,74HC00,SOIC...

  • Page 42: Mc1 Digital Input Board Assembly

    MC-1 Service Manual PART NO DESCRIPTION REFERENCE 430-10421 LEDSM,INNER LENS,GRN D27,29,31,33,35,37 D39,41 453-10418 SWSM,PBM,1P1T,6MMSQ,100GF,BRN SW1-13 460-04598 BATTERY,LITH,3V,FLAT BAT1 490-02356 CONN,JUMPER,.1X025,2FCG W1-4 pins 2&3; W5 pins 1&2 510-02899 CONN,POST,100X025,HDR,3MC W1-5 510-06168 CONN,POST,079,HDR,15MC 510-09765 CONN,POST,079,HDR,10MC J20,21,30 510-09790 CONN,DIN,5FC@180DEG,PCRA,SHLD 510-10546 CONN,POST,079,HDR,4MC J25,29 510-10595 PHONE JACK,3.5MM,PCRA,3C,STER 510-12825 CONN,POST,079,HDR,7MC 510-13145 CONN,POST,.100,HDR,2X7MCG,LP...
  • Page 43 Lexicon PART NO DESCRIPTION REFERENCE 202-09873 RESSM,RO,5%,1/10W,10K OHM R23,24,102,116,126 R128,133,137,140,145 202-09874 RESSM,RO,5%,1/10W,2.2M OHM R123 202-10426 RESSM,RO,5%,1/10W,15K OHM R122 202-10557 RESSM,RO,5%,1/10W,4.7K OHM R90,97 202-10558 RESSM,RO,5%,1/10W,47K OHM R2,12 202-10571 RESSM,RO,5%,1/10W,100K OHM R25-33,82,105,110 R112,132 202-10573 RESSM,RO,5%,1/10W,470K OHM R15,84 202-10943 RESSM,RO,5%,1/10W,22K OHM R106,127,131,136 202-10944 RESSM,RO,5%,1/10W,33K OHM R85,98,121 202-10945 RESSM,RO,5%,1/10W,1.5K OHM...

  • Page 44: Mc1 Rca Board Assembly

    MC-1 Service Manual MC1 RCA BOARD ASSEMBLY PART NO DESCRIPTION REFERENCE 202-09871 RESSM,RO,5%,1/10W,1K OHM R601,604,607,610 R613,616,619,622 202-13579 RESSM,RO,5%,1/10W,22 OHM R602,605,608,611 R614,617,620,623 203-13599 RESSM,THIN,.1%,1/10W,75.0 OHM R603,606,609,612 R615,618,621,624 240-11827 CAPSM,ELEC,10uF,16V,20% C617,618 245-12485 CAPSM,CER,.1uF,25V,Z5U,20% C601-616 310-10510 TRANSISTORSM,2N3904,SOT23 Q601-608 346-10507 ISCM,SS SWITCH,74HC4051,SOIC U601,602 510-13147 CONN,RCA,PCRA,1FCG,YEL,GND...

  • Page 45: Mc1 Chassis/Mechanical

    Lexicon PART NO DESCRIPTION REFERENCE 704-12474 HEATSINK,SMT,WING,3X.5"PSA MC1 CHASSIS/MECHANICAL 410-12535 FAN,TUBE-AX,~40X10MM,5VDC 430-13143 DISPLAY,VF,20X2 CHAR,5X8DOT 454-13124 SW,ROCKER,2P1T,16A@250,BLK,VER 490-11462 CONN,AC,3MC,SNAP,04TH,IEC,10A 490-13144 CONN,PLUG,.200,4FC,RA,12-30G 525-12536 CONN,CONT,CRIMP,22-26AWG FAN ASSY 527-12537 CONN,HSG,CRIMP,.100X2,POL,LK FAN ASSY 527-12974 CONN,DSUB,JSCKT,4-40,.187X.25 DIG IN ASSY530-02488 TIE,CABLE,NYL,.14"X5 5/8" FERRITE SLEEVE TO PS SUPPORT 530-02489 TIE,CABLE,NYL,.1"X4"...

  • Page 46: Mc1 Packaging/Miscellaneous

    MC-1 Service Manual PART NO DESCRIPTION REFERENCE 700-13026 COVER,MC1 700-13027 SUPPORT,PS,MC1 700-13037 ENDCAP,FRONT,LEFT,MC1 700-13038 ENDCAP,FRONT,RIGHT,MC1 700-13039 ENDCAP,REAR,MC1 701-09863 CLAMP,HEATSINK,TO-220 701-13028 BRACKET,VIDEO BD,DC2/MC1 701-13029 BRACKET,DIG IN BD,MC1 701-13224 BRACKET,SUPPORT,FAN,MC1 702-11348 COVER,PROTECTIVE,PS,1.75X3.4 CHASSIS 702-13030 PANEL,FRONT,MC1 702-13032 PANEL,REAR,MC1 702-13035 PANEL,SIDE,MC1 2 702-13225 COVER,PROTECTIVE,PS,1.00X3.55...

  • Page 47: Schematics

    Lexicon Chapter 7 Draw i ngs Schematics 060-13058 SCHEM,MAIN BD,DC2/MC1 060-13068 SCHEM,DIG IN BD,DC2/MC1 060-13298 SCHEM,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...
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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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