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MITSUBISHI ELECTRIC

Service Manual
PROJECTION TELEVISION VK20 CHASSIS

2002

WT-42311 WT-A42

CAUTION: Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and "PRODUCT SAFETY NOTICE" contained in this manual.

SPECIFICATIONS
• Power : AC 120V, 60Hz 240W : VHF 54 ~ 470MHz UHF 470 ~ 806MHz : VHF/UHF 75Ω unbalanced : [7 inches] :32.0kV (at 0A) • Speaker : Two 5" round, full range (8Ω 5W) • Input Level : VIDEO IN JACK (RCA Type) 1.0Vp-p 75Ω unbalanced : AUDIO IN JACK (RCA Type) -4.7dBm 43kΩ unbalanced : S-VIDEO IN JACK (Y/C separate) Y=1.0 Vp-p C=0.286Vp-p(BURST) 75Ω 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 75Ω (RCA Type) Pr, Pb:700mV 75Ω H, V: 3.0Vp-p 75Ω : VIDEO OUT JACK (RCA Type) 1.0Vp-p 75Ω unbalanced : AUDIO OUT JACK (RCA Type) -4.7dBm 4.7kΩ unbalanced

• Frequency Range • Antenna Input • CRT Size • High Voltage

• Cabinet Dimensions • Weight

: 39"(W)x34"(H)x25"(D)

: 105 lbs

• Output Level

• Weight and dimensions shown are approximate. • Design specifications are subject to change withoutnotice.

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904 Copyright © 2002 Mitsubishi Digital Electronics America, Inc. All Rights Reserved

MODELS: WT-42311 / WT-A42

CONTENTS
INTRODUCTION ................................................................................................................................ 5 PRODUCT SAFETY NOTICE............................................................................................................. 5 SAFETY PRECAUTIONS ................................................................................................................... 6 CABINET DISASSEMBLY Front View Disassembly................................................................................................................. 7 Rear View Disassembly .................................................................................................................. 8 SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS Lenticular Screen and Fresnel Lens Removal .................................................................................. 9 Lenticular Screen and Fresnel Lens Installation.............................................................................. 9 SERVICING PCBs Accessing the Main Chassis ........................................................................................................ 10 PCB Locations .............................................................................................................................. 11 Main ComponentsLocation........................................................................................................... 11 CRT REPLACEMENT Second Anode Lead Removal ....................................................................................................... 12 CRT Removal................................................................................................................................ 12 CRT Installation ............................................................................................................................ 23 ELECTRICAL ADJUSTMENTS Test Equipment ............................................................................................................................. 15 Initial Setup................................................................................................................................... 16 LED Indicator Diagnostics ............................................................................................................. 17 Circuit Adjustment Mode ............................................................................................................... 18 Convergence Adjustment Mode...
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