MITSUBISHI WS73907 Service Manual

Cover page of MITSUBISHI WS73907 Service Manual

Service Manual for MITSUBISHI WS73907, downloadable as a PDF file.

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CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
· Weight and dimensions shown are approximate.
· Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2000 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
PROJECTION TELEVISION
V17 / V17+ / V17++ CHASSIS
MITSUBISHIELECTRIC Ser
Ser
Ser
Ser
Service
vice
vice
vice
vice
Manual
Manual
Manual
Manual
Manual
2000
2000
2000
2000
2000
SPECIFICATIONS
· Power
: AC 120V, 60Hz, 320W
· Frequency
: VHF
54 ~ 470MHz
Range
UHF 470 ~ 806MHz
· Antenna Input
: VHF/UHF 75
unbalanced
Single axis input
·
CRT Size
: [WT-46807 / WS-55807 / WS-65807
WS-55857 / WS-65857 / WS-55907
WS-65907] 7 inches [WS-73907] 9 inches
·
High Voltage
: 32.0kV (at 0A)
·
Speaker
: [WT-46807 / WS-55807 / WS-65807
WS-55857 / WS-65857]
5" round type, full range 2 pcs. (8
10W)
: [WS-55907 / WS-65907 / WS-73907]
5" round type, full range 2 pcs. (8
10W)
2" round type, tweeter 2 pcs. (8
10W)
·
Weight
: [WT-46807] 121 lbs
: [WS-55807] 250 lbs
: [WS-65807] 323 lbs
: [WS-55857] 243.5 lbs
: [WS-65857] 321.5 lbs
: [WS-55907] 256 lbs
: [WS-65907] 348 lbs
: [WS-73907] 405 lbs
·
Cabinet
: [Model] (H)x(W)x(D)
Dimensions
: [WT-46807] 37.4"x41.6"x28"
: [WS-55807] 51.6"x50.6"x28.3"
: [WS-65807] 61.8"x58.7"x27.5"
: [WS-55857] 51.9"x50.7"x28.2"
: [WS-65857] 61.9"x59"x28.2"
: [WS-55907] 51.5"x49.9"x28.1"
: [WS-65907] 61.6"x58.2"x28.2"
: [WS-73907] 65.7"x64.3"x29.8"
·
Input Level
: VIDEO IN JACK (RCA Type)
1.0Vp-p 75
unbalanced
: AUDIO IN JACK (RCA Type)
-4.7dBm 43k
unbalanced
: S-VIDEO IN JACK
(Y/C separate type)
Y:1.0 Vp-p C:0.286Vp-p(BURST)
75
unbalanced
: DVD / Y, Cr, Cb (RCA Type)
Y: 1.0 Vp-p Cr, Cb: 700mVp-p
: ATV / Y(G), Pr(R), Pb(B), H, V
Y: 1.0Vp-p with sync 75
(BNC)
Pr, Pb: 700mV 75
H, V: 3.0Vp-p 75
·
Output Level
: VIDEO OUT JACK (RCA Type)
1.0Vp-p 75
unbalanced
: AUDIO OUT JACK (RCA Type)
-4.7dBm 4.7k
unbalanced
V17
MODELS
WT-46807
WS-55807
WS-65807
V17+
MODELS
WS-55857
WS-65857
V17++
MODELS
WS-55907
WS-65907
WS-73907
WS-73907
background image
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
· Weight and dimensions shown are approximate.
· Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2000 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
PROJECTION TELEVISION
V17 / V17+ / V17++ CHASSIS
MITSUBISHIELECTRIC Ser
Ser
Ser
Ser
Service
vice
vice
vice
vice
Manual
Manual
Manual
Manual
Manual
2000
2000
2000
2000
2000
SPECIFICATIONS
· Power
: AC 120V, 60Hz, 320W
· Frequency
: VHF
54 ~ 470MHz
Range
UHF 470 ~ 806MHz
· Antenna Input
: VHF/UHF 75
unbalanced
Single axis input
·
CRT Size
: [WT-46807 / WS-55807 / WS-65807
WS-55857 / WS-65857 / WS-55907
WS-65907] 7 inches [WS-73907] 9 inches
·
High Voltage
: 32.0kV (at 0A)
·
Speaker
: [WT-46807 / WS-55807 / WS-65807
WS-55857 / WS-65857]
5" round type, full range 2 pcs. (8
10W)
: [WS-55907 / WS-65907 / WS-73907]
5" round type, full range 2 pcs. (8
10W)
2" round type, tweeter 2 pcs. (8
10W)
·
Weight
: [WT-46807] 121 lbs
: [WS-55807] 250 lbs
: [WS-65807] 323 lbs
: [WS-55857] 243.5 lbs
: [WS-65857] 321.5 lbs
: [WS-55907] 256 lbs
: [WS-65907] 348 lbs
: [WS-73907] 405 lbs
·
Cabinet
: [Model] (H)x(W)x(D)
Dimensions
: [WT-46807] 37.4"x41.6"x28"
: [WS-55807] 51.6"x50.6"x28.3"
: [WS-65807] 61.8"x58.7"x27.5"
: [WS-55857] 51.9"x50.7"x28.2"
: [WS-65857] 61.9"x59"x28.2"
: [WS-55907] 51.5"x49.9"x28.1"
: [WS-65907] 61.6"x58.2"x28.2"
: [WS-73907] 65.7"x64.3"x29.8"
·
Input Level
: VIDEO IN JACK (RCA Type)
1.0Vp-p 75
unbalanced
: AUDIO IN JACK (RCA Type)
-4.7dBm 43k
unbalanced
: S-VIDEO IN JACK
(Y/C separate type)
Y:1.0 Vp-p C:0.286Vp-p(BURST)
75
unbalanced
: DVD / Y, Cr, Cb (RCA Type)
Y: 1.0 Vp-p Cr, Cb: 700mVp-p
: ATV / Y(G), Pr(R), Pb(B), H, V
Y: 1.0Vp-p with sync 75
(BNC)
Pr, Pb: 700mV 75
H, V: 3.0Vp-p 75
·
Output Level
: VIDEO OUT JACK (RCA Type)
1.0Vp-p 75
unbalanced
: AUDIO OUT JACK (RCA Type)
-4.7dBm 4.7k
unbalanced
V17
MODELS
WT-46807
WS-55807
WS-65807
V17+
MODELS
WS-55857
WS-65857
V17++
MODELS
WS-55907
WS-65907
WS-73907
WS-73907
background image
background image
MODELS: WT-46807 / WS-55807 / WS-55857 / WS-55907 / WS-65807 / WS-65857 / WS-65907 / WS-73907
Page 3
INTRODUCTION ............................................................................................................................... 5
PRODUCT SAFETY NOTICE ...........................................................................................................5
SAFETY PRECAUTIONS ................................................................................................................. 6
DISASSEMBLY
Cabinet Disassembly (Front View)
WT-46807 ...................................................................................................................................... 7
WS-55807 / WS-65807 .................................................................................................................. 8
WS-55857 / WS-65857 .................................................................................................................. 9
WS-55907 / WS-65907 / WS-73907 ............................................................................................ 10
Cabinet Disassembly (Rear View)
WT-46807 .................................................................................................................................... 11
WS-55807 / WS-55857 / WS-55907 / WS-65807 / WS-65857 /
WS-65907 / WS-73907 ................................................................................................................ 12
Cabinet Separation Procedure WS-65807 / WS-65857 / WS-65907 / WS-73907 ....................... 13
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
Lenticular Screen and Fresnel Lens Removal
WS-55807 / WS-65807 ....................................................................................................... 14
WS-55857 / WS-55907 / WS-65857 / WS-65907 / WS-73907 / WT-46807 ...................... 15
Lenticular Screen and Fresnel Lens Installation .................................................................... 16
SERVICING THE DIAMONDSHIELDTM r
DiamondShieldTM Removal / Installation ...................................................................................... 17
SERVICING PCBs
PCB Locations and Chassis Removal ......................................................................................... 18
Main Component Locations ......................................................................................................... 18
CRT REPLACEMENT
CRT Removal .............................................................................................................................. 19
CRT Installation ........................................................................................................................... 20
ELECTRICAL ADJUSTMENTS
Test Equipment ............................................................................................................................ 22
Initial Setup .................................................................................................................................. 22
Self Diagnostics ........................................................................................................................... 24
Circuit Adjustment Mode .............................................................................................................. 24
Convergence Adjustment Mode ................................................................................................... 26
E2PROM Replacement ................................................................................................................ 28
Adjustment Items List .................................................................................................................. 28
Adjustment Test Points ................................................................................................................ 31
Adjustment Procedures ................................................................................................................ 32
Audio Circuit ....................................................................................................................... 32
High Voltage Regulation ..................................................................................................... 33
Main/Sub Y Level ................................................................................................................33
Side by Side Sub Picture Tint ............................................................................................. 34
Side by Side Sub Picture Color .......................................................................................... 34
CRT Cutoff .......................................................................................................................... 35
White Balance (NTSC) ....................................................................................................... 35
White Balance (HD) ............................................................................................................ 36
Cb, Cr Offset ....................................................................................................................... 36
Black Level ......................................................................................................................... 37
CONTENTS
background image
MODELS: WT-46807 / WS-55807 / WS-55857 / WS-55907 / WS-65807 / WS-65857 / WS-65907 / WS-73907
Page 4
Sub Contrast ....................................................................................................................... 37
Dynamic Focus Preset ........................................................................................................ 38
Electrostatic Focus .............................................................................................................. 38
Lens Focus .......................................................................................................................... 39
Character Position ..............................................................................................................39
Deflection/Convergence Geometry Presets ........................................................................ 40
Deflection Circuit Geometry Adjustments ........................................................................... 41
Convergence Circuit Geometry Adjustments ...................................................................... 42
Centering and Static Convergence ..................................................................................... 43
Coarse Convergence Adjustments ..................................................................................... 44
Fine Convergence Adjustments .......................................................................................... 45
CHIP PARTS REPLACEMENT ....................................................................................................... 46
REPLACEMENT PARTS
Parts Ordering .............................................................................................................................. 47
Critical and Warranty Parts Designation ...................................................................................... 47
Parts Tolerance Codes ................................................................................................................. 47
Quick Reference List ................................................................................................................... 48
Service Parts List ......................................................................................................................... 49
CIRCUITRY BLOCK DIAGRAMS
Standby Supply Regulator ........................................................................................................... 66
Switched Supply Regulator .......................................................................................................... 67
Video / Color A/V Switch Circuit .................................................................................................. 68
Video / Color Signal Path ............................................................................................................. 69
Sync Signal Path ......................................................................................................................... 70
Deflection / HV ............................................................................................................................. 71
X-Ray Protect ............................................................................................................................... 71
Sound Circuit ............................................................................................................................... 72
Convergence ................................................................................................................................ 73
Control Circuit .............................................................................................................................. 74
Section 2 .... Schematic Diagrams
SCHEMATIC DIAGRAMS
Overall Block Diagram ................................................................................................................... 1
PCB-POWER ................................................................................................................................. 2
PCB-MAIN ..................................................................................................................................... 3
PCB-SIGNAL (AV/I-O .................................................................................................................... 4
PCB-SIGNAL (MICRO) .................................................................................................................. 5
PCB-SIGNAL (VC/SW) .................................................................................................................. 6
PCB-2HDW (IN) ............................................................................................................................. 7
PCB-2HDW (MAIN) ....................................................................................................................... 8
PCB-2HDW (OUT) ......................................................................................................................... 9
PCB-TERMINAL .......................................................................................................................... 10
PCB-CONVERGENCE GENERATOR/JUNGLE .......................................................................... 11
PCB-3DYC/MAIN DECODER ...................................................................................................... 12
PCBs - CRT/CONTROL/PREAMP/DBF/FRONT/DISPLAY ......................................................... 13
PCB-BMP (1) ............................................................................................................................... 14
PCB-BMP (2) ............................................................................................................................... 15
PCB LAYOUT DIAGRAMS .............................................................................................................16
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Page 5
MODELS: WT-46807 / WS-55807 / WS-55857 / WS-55907 /WS-65807 / WS-65857 / WS-65907 / WS-73907
INTRODUCTION
This service manual provides service instructions for PTV Models WT-46807, WS-55807 and WS-65807 which
use the V17 chassis, PTV Models WS-559857, and WS-65857 which use the V17+ chassis, and PTV Models
WS-55907, WS-65907 and WS-73907 which use the V17++ chassis. Service personnel should read this manual
thoroughly before servicing these chassis.
This service manual includes:
1. Assembly and disassembly instructions for the front and rear cabinet components.
2. Servicing of the Lenticular Screen and Fresnel Lens.
3. Servicing printed circuit boards (PCBs).
4. CRT replacement procedure.
5. Electrical adjustments.
6. Chip parts replacement procedures.
7. Circuit path diagrams.
The parts list section of this service manual includes:
1. Cabinet and screen parts.
2. Electrical parts.
Schematic and block diagrams of the above listed models are included in this service manual for better under-
standing of the circuitry. PCB drawings are also included for easy location of parts and test points.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be
obtained by using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have special safety characteristics are identified in this service manual.
Electrical components having such features are identified by shading
in the schematics and by bold type in
the parts list of this service manual. The replacement for any safety part should be identical in value and
characteristics.

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