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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