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                                                 T   ECHNICAL
                                                    RAINING

                                                 2002
 Projection Television
 Technical Training Manual

                                                             DIGITAL
                                                              AUDIO
                                                             OUTPUT




      V19-V21                                                   IR
                                                             EMITTER
                                                              HOME
                                                             THEATER
                                                             CONTROL




                                                             MEMORY
                                                              CARD




                                                              IEEE
                                                              -1394


                                                              INPUT/
                                                             OUTPUT




V19 CHASSIS          V21 CHASSIS
 WS-55859        WS-48511   WS-65511
                                                              ANT-DTV
 WS-55909         WS-B55    WS-65611
 WS-65909        WS-55511   WS-65711
 WS-65869        WS-55711   WS-65712
 WS-73909                   WS-73711




              MITSUBISHI ELECTRIC
              MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
                               V19-V21 TRAINING MANUAL
                                  TABLE of CONTENTS
Chapter 1 ... Introduction
 Features ............................................................................................................ 1-1
 External Inputs & Outputs .................................................................................... 1-4
 Remote Control .................................................................................................. 1-6
 LED Diagnostics ............................................................................................... 1-6

Chapter 2 ... NetCommandTM
 NetCommandTM .................................................................................................. 2-1
     IEEE-1394 Devices .................................................................................... 2-1
     Remote Operational Mode ......................................................................... 2-1

Chapter 3 ... Disassembly & PCB Location
 Rear Disassembly ............................................................................................. 3-1
     Light Box Removal ..................................................................................... 3-1
 Chassis Removal ............................................................................................... 3-2
 Main Chassis PCB Location .............................................................................. 3-2
 Main Parts Location ........................................................................................... 3-2
 DM Module Main Parts Location ........................................................................ 3-3

Chapter 4 ... Adjustments
 Activation Codes ............................................................................................... 4-1
 Adjustment Mode ............................................................................................... 4-2
      Function Nomenclature ............................................................................... 4-2
 OSD Position Mode ........................................................................................... 4-2
 Convergence Mode ........................................................................................... 4-2
      HD Convergence With No Signal ................................................................ 4-3

Chapter 5 ... Power Supply
 Overall Block Diagram ....................................................................................... 5-1
 Standby Supplies Switch Mode Regulator .......................................................... 5-2
 Switched Supplies Switch Mode Regulator ........................................................ 5-3
     On/Off Circuitry ........................................................................................... 5-3
 DM Power Supply .............................................................................................. 5-5
 DC Supply Source Locations ............................................................................. 5-7

Chapter 6 ... Control Circuitry
 Overall Block Diagram ....................................................................................... 6-1
 Input Command Circuitry .................................................................................... 6-2
 Serial Data Lines ............................................................................................... 6-3
 DC Supplies ...................................................................................................... 6-4
 Reset Circuitry ................................................................................................... 6-4
 V-Chip Blocking Circuitry ................................................................................... 6-5
 AC-OFF Circuitry ............................................................................................... 6-6
 Additional Inputs and Outputs ............................................................................. 6-7


                                                          1
 DM Module Control Circuitry .............................................................................. 6-7
    Software Update Procedure ....................................................................... 6-9
    DM Module Replacement ......................................................................... 6-10

Chapter 7 ... Video/Color Circuitry
 Overall Block Diagram ....................................................................................... 7-1
 NTSC Signa Selection ....................................................................................... 7-2
 PCB-SIGNAL Video Color Signal Path .............................................................. 7-3
 3DYC/Main Decoder Circuitry ............................................................................ 7-4
 YCbCr Select Circuitry ....................................................................................... 7-5
 VCJ Video/Color Signal Path ............................................................................. 7-6
 RGB CRT Drive & Protect Circuitry .................................................................... 7-8
 Monitor Out Video/Color Signal Path .................................................................. 7-8
 DM Module Video/Color Block Diagram .......................................................... 7-10

Chapter 8 ... Deflection and High Voltage
 Sync Block Diagram .......................................................................................... 8-1
 Sync Signal Path ................................................................................................ 8-2
 Deflection and High Voltage ............................................................................... 8-3
 HV 12 Volt Supply .............................................................................................. 8-4
 HV Regulation .................................................................................................... 8-5
 X-Ray Protect .................................................................................................... 8-5
 Deflection Loss Detection .................................................................................. 8-6
 Flash Protect Circuit........................................................................................... 8-7

Chapter 9 ... Sound Circuitry
 Overall Block Diagram ....................................................................................... 9-1
 Signal Path ........................................................................................................ 9-2
 AC-3 Output ....................................................................................................... 9-3

Chapter 10 ... Convergence Circuitry
 Overall Block Diagram ..................................................................................... 10-1
 Waveform Generator and D/A Converter .......................................................... 10-2
 LPF and Summing Amplifiers .......................................................................... 10-3
 Convergence Output Circuitry ........................................................................... 10-4

Chapter 11 ...Troubleshooting Tips
 Using the Front Panel LED ............................................................................... 11-1
 DM Module Check ........................................................................................... 11-1
 NetCommandTM Control Problems .................................................................... 11-1
 CRT Phosphor Protection ................................................................................ 11-1




                                                         2
                                           Chapter 1
                                         Introduction
                               V19 CHASSIS                    V21 CHASSIS
                                WS-55859                  WS-48511   WS-65511
                                WS-55909                   WS-B55    WS-65611
                                WS-65909                  WS-55511   WS-65711
                                WS-65869                  WS-55711   WS-65712
                                WS-73909                             WS-73711




The V19 and V21 are Mitsubishi's high end Projection                

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