MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2002 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
MITSUBISHIELECTRIC
Service
Manual
2002
2002
2002
2002
2002
· Weight and dimensions shown are approximate.
· Design specifications are subject to change without notice.
PROJECTION TELEVISION
VK20 CHASSIS
SPECIFICATIONS
· Power
: AC 120V, 60Hz
240W
· Frequency
: VHF
54 ~ 470MHz
Range
UHF 470 ~ 806MHz
· Antenna Input
: VHF/UHF 75
unbalanced
·
CRT Size
: [7 inches]
·
High Voltage
: 32.0kV (at 0A)
·
Cabinet
: 39"(W)x34"(H)x25"(D)
Dimensions
·
Weight
: 105 lbs
· Speaker
: Two 5" round, full range (8
5W)
· 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)
Y=1.0 Vp-p C=0.286Vp-p(BURST)
75
unbalanced
: COMP / 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
(RCA Type)
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
WT-42311
WT-A42
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2002 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
MITSUBISHIELECTRIC
Service
Manual
2002
2002
2002
2002
2002
PROJECTION TELEVISION
VK20 CHASSIS
WT-42311
WT-A42
PART 2
SCHEMATIC DIAGRAMS
CONTENTS
Page
Schematic Diagrams
Overall PCB Block Diagram ..................................................... 1
PCB-MAIN................................................................................ 2
PCB-POWER ........................................................................... 3
PCB-TERMINAL (Input Switch) ............................................... 4
PCB-TERMINAL (3DYC / Decoders) ....................................... 5
PCB-SIGNAL-1 (AV I/O) ........................................................... 6
PCB-SIGNAL-2 (MICRO) ......................................................... 7
PCB-SIGNAL-3 (VCJ) .............................................................. 8
PCB-SIGNAL-4 (Convergence Generator) ............................... 9
PCBs - CONTROL / CRTs / DBF / PREAMP / SVM / UNI ..... 10
PCB-DOUBLER-1 (Input) ....................................................... 11
PCB-DOUBLER-2 (Main) ....................................................... 12
PCB-DOUBLER-3 (Output) .................................................... 13
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" in Part 1 of this manual.
