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Mitsubishi Electric WT-42313 Service Manual

K20 chassis
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MITSUBISHI ELECTRIC
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
• Power
: AC 120V, 60Hz
240W
• Frequency
: VHF 54 ~ 470MHz
Range
UHF 470 ~ 806MHz
• Antenna Input
: VHF/UHF 75Ω unbalanced
• CRT Size
: [7 inches]
• High Voltage
: 32.0kV (at 0A)
• Cabinet
: 39"(W)x34"(H)x25"(D)
Demensions
• Weight
: 105 lbs
• Weight and dimensions shown are approximate.
• Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
Copyright © 2003 Mitsubishi Digital Electronics America, Inc.
Service
Manual
PROJECTION TELEVISION
K20 CHASSIS

SPECIFICATIONS

9351 Jeronimo Road, Irvine, CA 92618-1904
All Rights Reserved
WT-42313
WT-42413
• 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
• Digital Inputs MonitorLink
• Output Level
: VIDEO OUT JACK (RCA Type)
1.0Vp-p 75Ω unbalanced
: AUDIO OUT JACK (RCA
-4.7dBm 4.7k
2003
TM
/DVI
Type)
Ω
unbalanced

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Summary of Contents for Mitsubishi Electric WT-42313

  • Page 1: Specifications

    2003 Service MITSUBISHI ELECTRIC Manual PROJECTION TELEVISION K20 CHASSIS WT-42313 WT-42413 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 • Speaker : Two 5" round, full range (8Ω 5W) •...

  • Page 3: Table Of Contents

    MODELS: WT-42313 / WT-42413 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 ................

  • Page 4: Schematic Diagrams

    MODELS: WT-42313 / WT-42413 CHIP PARTS REPLACEMENT ......................37 REPLACEMENT PARTS Parts Ordering ..........................38 Critical and Warranty Parts Designation ..................38 Parts Tolerance Codes ........................38 Replacement Part Notes When replacing the RF-Switch or PCB-SIGNAL ..............38 When replacing the EEPROM ....................38 Quick Reference List ........................

  • Page 5: Models: Wt-42313 / Wt

    MODEL: WT-42313 / WT-42413 INTRODUCTION This service manual provides service instructions for PTV Models WT-42313 and WT-42413 using the VK20 chassis. Service personnel should read this manual thoroughly before servicing this chassis. This service manual includes: 1. Assembly and disassembly instructions for the front and rear cabinet components.

  • Page 6: Safety Precautions

    MODEL: WT-42313 / WT-42413 SAFETY PRECAUTIONS NOTICE: Observe all cautions and safety related notes located inside the receiver cabinet and on the receiver chassis. WARNING: Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard from the receiver's power supplies.

  • Page 7: Cabinet Disassembly

    MODEL: WT-42313 / WT-42413 CABINET DISASSEMBLY (FRONT VIEW) *Refer to PARTS LIST for Part Numbers Front Cabinet Disassembly 1. Remove the Speaker Grille by pulling forward. 2. Remove the Board-Front by removing 3 screws "a". 3. Remove 3 screws “b” and then remove the Front Mask and Diamond Shield.

  • Page 8: Rear View Disassembly

    MODEL: WT-42313 / WT-42413 CABINET DISASSEMBLY (REAR VIEW) Rear Cabinet Disassembly 1. Remove the Back Board by removing screws 7 "a". 2. Remove 6 screws "b" securing the Light Box Assembly. 3. Disconnect connector EJ. 4. Slide the Light Box Assembly out of the cabinet.

  • Page 9: Servicing The Lenticular Screen And Fresnel Lens

    MODEL: WT-42313 / WT-42413 SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS CAUTION: Wear gloves when handling the Lenticular Screen and Fresnel Lens. This prevents cuts and finger prints. Do not place Fresnel Lens in the sun. This may cause fire and heat related injuries.

  • Page 10: Servicing Pcbs

    MODEL: WT-42313 / WT-42413 SERVICING PCBs Accessing The Main Chassis In the VK20 chassis, the Main Chassis is located in front of the CRTs. Use the following procedure to access the Main Chassis. 1) Remove the Light Box Assembly, refer to the Cabinet Rear Disassembly.

  • Page 11: Pcb Locations

    MODEL: WT-42313 / WT-42413 PCB Locations Major Parts Locations Page 11...

  • Page 12: Crt Replacement

    MODEL: WT-42313 / WT-42413 ANODE LEAD REMOVAL CAUTION: To prevent damage, the following procedure must be used when removing an Anode Lead from the Flyback Transformer. 2) While holding the lead down rotate 1) Push the Anode Lead down. the lead 90º counter clockwise.
  • Page 13 MODEL: WT-42313 / WT-42413 Note: The 4 spring-loaded screws shown in Fig 2 and labeled as "DO NOT REMOVE", should not be loosened under any circumstance. Doing so will break the seal between the CRT and the CRT-Spacer, causing leakage of the CRT Coolant.
  • Page 14 MODEL: WT-42313 / WT-42413 1. Carefully position the replacement CRT and fasten in place using 4 screws "c". [Figure 2] 2. Install the Deflection Yoke on the CRT neck. [Figure 3] 3. Install the Lens that was removed in step 5 of Removal of the CRT.

  • Page 15: Electrical Adjustments

    MODEL: WT-42313 / WT-42413 ELECTRICAL ADJUSTMENTS Note: Perform only the adjustments required. Do not attempt an alignment if proper equipment is not available. 1. Test Equipment • Oscilloscope (Unless otherwise specified, use 10:1 probes) • Signal Generator (both SD and HD capable) •...

  • Page 16: Initial Setup

    MODEL: WT-42313 / WT-42413 3. Initial Setup A. Option Menu Setup Follow the steps below for the initial set-up: 1. Select the "MENU" display by pressing the "MENU" button once. 2. Press the number buttons "0", "3", "7", "0" in sequence to select the "OPTION MENU" display.

  • Page 17: Led Indicator Diagnostics

    MODEL: WT-42313 / WT-42413 Items in the table below are set to following after Initalization. AV Memory Initial Settings Ant-A NTSC A/V Memory COMP MonLink Ant-B 1/2/3 TV Contrast TV Brightness Center Center Center Center Center TV Sharpness Center Center...

  • Page 18: Circuit Adjustment Mode

    MODEL: WT-42313 / WT-42413 5. Circuit Adjustment Mode Except for the following, all adjustment items must be performed using the remote hand unit. • Lens Focus FUNCTION CHASSIS • Electrostatic Focus A. Activating the Circuit Adjustment Mode Video Chr 1. Press the "MENU" button on a remote hand unit.

  • Page 19: Service Mode Reset

    MODEL: WT-42313 / WT-42413 D. Saving Adjustment Data Press “ENTER” to save adjustment data in memory. The character display turns red for approximately one second in this step. Note: If the circuit adjustment mode is terminated without pressing “ENTER”, changes in adjustment data are not saved.
  • Page 20 MODEL: WT-42313 / WT-42413 D. CONV MISC (Press 6) This mode is used to preset data values controlling the Convergence Generator, and to perform the HV Regulation adjustment. Use the VIDEO button to select an item. Use the ADJUST buttons to change data.

  • Page 21: Adjustment Items List

    MODEL: WT-42313 / WT-42413 Cursor Coordinates Specific intersections in the Crosshatch are assigned vertical and horizontal coordinates. These are shown in the preceeding diagram. The Cursor can only be moved to those positions that have coordinates assigned. If the Cursor is at coordinates outside the screen area, the Cursor will not be visible.
  • Page 22 MODEL: WT-42313 / WT-42413 Deflection Jungle Menu-0-3-5-7 Item# Abbrev. Description Range HD Others HWID Width 0~63 HKEY Horiz. Keystone 0~63 VHGT Height 0~63 VLIN Vert. Linearity 0~15 VSCN Vert. S Corr. 0~15 VPOS Vert. Position 0~63 PINA Horiz. PC Corr.

  • Page 23: Crt Installation

    MODEL: WT-42313 / WT-42413 COARSE CONV GREEN (MENU-0-3-5-9-5) Abbrev. Description HSTA Horiz. Position VSTA Vert. Position SKEW Skew (Y axis) TILT Tilt (X axis) HWID Width HLIN Horiz. Linearity SPCC Side PC Corr. HKEY Horiz. Keystone TBPC Top/Bottom PC -180...

  • Page 24: Adjustment Test Points

    MODEL: WT-42313 / WT-42413 Adjustment Test Point Location Test Points DT pin 3 - HV Adjust DT pin 6 - Ground DT pin 7 - 12 Volts DT pin 8 - ACL JA pin 14- Main Picture (Y) JA pin 18 - Main Color (Cr)

  • Page 25: Adjustment Procedures High Voltage Regulation

    MODEL: WT-42313 / WT-42413 To set the CRT Anode voltage. Purpose: [HV Circuit] Dark Picture Symptom: 1. HV Regulation Measuring DC Voltmeter Note: This adjustment must be rechecked following Adjustment 9 CRT Cutoff. Instrument Test Point DT connector pins 3 & 6 1.

  • Page 26: Main/Sub Color Level

    MODEL: WT-42313 / WT-42413 Purpose: To match the sub picture color to that of the main picture. [Video Circuit] Symptom: 3. Main/Sub Color Level Main and sub pictures colors differ. Measuring Oscilloscope Instrument 1. Supply an NTSC signal to an External Video Input.

  • Page 27: White Balance (Ntsc)

    MODEL: WT-42313 / WT-42413 Purpose: [CRT Circuit] To set the CRTs white level in the NTSC mode. Symptom: 5. White Balance (NTSC) Monochrome has a color tint. Measuring Note: Use the “FORMAT” button to activate the Expand mode (full screen).

  • Page 28: Black Level

    MODEL: WT-42313 / WT-42413 Purpose: [Video Circuit] To set the black level of the picture. Excess or insufficient brightness. Symptom: 7. Black Level Measuring ----- Instrument 1. Supply a Monoscope signal to a Video Input. 2. Activate the Adjust Mode, Video Chroma Function.

  • Page 29: Dynamic Focus Preset

    MODEL: WT-42313 / WT-42413 [Focus Circuit] Purpose: To improve edge focus. 9. Dynamic Focus Preset Symptom: Poor focus at the edges of the screen. Measuring ----- 1. Supply a Monoscope signal to a Video Input Instrument 2. Activate the Convergence Mode.

  • Page 30: Electrostatic Focus

    MODEL: WT-42313 / WT-42413 [CRT Circuit] Purpose: To set electrostatic focus to the optimum point. Symptom: Poor focus. 11. Electrostatic Focus Measuring ----- Instrument Note: This adjustment must be performed after the Sub Contrast adjustment. Test Point ----- Static Focus Adjustment ------ Ext.

  • Page 31: Deflection/Convergence Geometry Presets

    MODEL: WT-42313 / WT-42413 [Conv/Defl] To preset data controlling raster geometry Purpose: 13. Geometry Preset Raster distortion. Symptom: ----- Measuring Note: This procedure is usually only necessary if an E2PROM is replaced in the TV Instrument ------ Control or Convergence circuits.

  • Page 32: Deflection Circuit Geometry Adjustments

    MODEL: WT-42313 / WT-42413 Purpose: [Deflection Circuit] To set the height, width and linearity of the raster. Symptom: 14: Deflection Geometry Incorrect height, width and/or linearity. Height & Width Adjustment Measuring Instrument ----- Preliminary: Test Point 1. DO NOT change the initial values for “#8 VLIN” in the Defl. Jungle Function.

  • Page 33: Convergence Circuit Geometry Adjustments

    MODEL: WT-42313 / WT-42413 [Convergence Circuit] To set the Convergence circuit geometry adjustments. Purpose: 15. Convergence Geometry Symptom: Raster distortion at the top, bottom or sides of the picture. Adjustment ----- Measuring Note: Deflection Circuit Geometry must be performed before this adjustment.

  • Page 34: Centering And Static Convergence

    MODEL: WT-42313 / WT-42413 Purpose: [Convergence Circuit] To converge red, green and blue at the center of the screen Symptom: 16. Centering and Static Color edging over the entire picture. Convergence Measuring Instrument ----- Preliminary Test Point Degauss the shield cover and bracket unit of the CRT assembly and chassis.

  • Page 35: Coarse Convergence Adjustments

    MODEL: WT-42313 / WT-42413 [Convergence Circuit] Purpose: To converge red and blue on green at the edges of the screen. 17. Coarse Convergence Symptom: Color edging at the top, bottom and sides of the screen. Measuring SD mode ----- Instrument 1.

  • Page 36: Fine Convergence Adjustments

    MODEL: WT-42313 / WT-42413 Purpose: [Convergence Circuit] To converge red, green and blue at the edges of the screen Symptom: 18. Fine Convergence Color edging at the edges of the picture. Measuring ----- Instrument SD Fine Adjustment Test Point ----- 1.

  • Page 37: Chip Parts Replacement

    MODEL: WT-42313 / WT-42413 CHIP PARTS REPLACEMENT Some resistors, shorting jumpers (0 Ohm resistors), Chip Parts Removal (Transistors) ceramic capacitors, transistors and diodes are chip parts. Melt the solder of one lead and lift the side of The following precautions should be taken when replacing that lead upward.

  • Page 38: Replacement Parts

    MODEL: WT-42313 / WT-42413 REPLACEMENT PARTS Parts Ordering To expedite delivery of replacement parts orders, specify the following: Model Number/Serial Number Part Number and description Quantity Note: Unless complete information is supplied, delay in processing of orders will result. Critical and Warranty Parts Designation Critical Electrical Components are indicated by Bold Type in the Parts List, and in the schematic diagrams by shading.

  • Page 39: Quick Reference List

    MODEL: WT-42313 / WT-42413 QUICK REFERENCE FOR COMMON REPLACEMENT PARTS CRT ASSEMBLIES PART NO. DESCRIPTION 251C219010 ASSY-CRT-RED 251C219020 ASSY-CRT-GREEN 252C219030 ASSY-CRT-BLUE REMOTE CONTROL 290P116010 REMOTE CONTROL WT-42313 290P117010 REMOTE CONTROL WT-42413 HIGH VOLTAGE / DEFLECTION COMPONENTS Q5A31 261P122010 HORIZ-OUT 2SC5778...

  • Page 40: Service Parts List

    MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description TUBES IC7D10 275P769010 IC-C-MOS - TC74AC157FT IC7D11 275P769010 IC-C-MOS - TC74AC157FT 251C219010 ASSY-CRT-RED...
  • Page 41 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description Q5A05 260C004050 TR - 2SA933S-R,S/2SA1309A-R,S D5A33 264P669030 DIODE - S3L20U Q5A06 260C004050 TR - 2SA933S-R,S/2SA1309A-R,S...
  • Page 42 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description D9B02 264P045080 DIODE - 1S2076A/1S2471OM L2W02 409P923060 EMI-F-CHIP - BLM21B272S D9B03 264P045080 DIODE - 1S2076A/1S2471OM...
  • Page 43 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description L7E12 409P777020 EMI-F-CHIP - BLM21A05 L8G01 409P777080 EMI-F-CHIP - BLM21P221S L7E13 325C241030 COIL-CHIP - 10MH-K...
  • Page 44 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description LC7G04 409P876020 EMI-F-CHIP - CNF20C470S/CKD510JB1H470S Part No. Value Part No. Value LC7G05 409P876020...
  • Page 45 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description R5A21 103P713030 R-CARBON - 1/4W 4.7K-J R5A80 109P175010 R-WIRE - 2W 0.12-J R5A22...
  • Page 46 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description R5K10 103P711010 R-CARBON - 1/4W 68-J R6R02 103P713090 R-CARBON - 1/4W 15K-J R5K11...
  • Page 47 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description R8C62 103P713010 R-CARBON - 1/4W 3.3K-J CAPACITORS R8C63 103P713010 R-CARBON - 1/4W 3.3K-J...
  • Page 48 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description C2L12 181P355040 C-ELEC - 50V 4.7M-M C2V14 181P352040 C-ELEC - 16V 100M-M C2L14...
  • Page 49 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description C3K25 181P352030 C-ELEC - 16V 47M-M C5A72 181P355010 C-ELEC - 50V 1M-M C4B01 172P261030 C-M-POLY - 50V 0.01M-J C5A73 172P264010 C-M-POLY - 50V 2.2M-J...
  • Page 50 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description C6R12 155P239040 C-CER - CH50V 100P-J C9A07 189P153040 C-M-POLY - 250VAC 0.1M-M C6R13...
  • Page 51 MODEL: WT-42313 / WT-42413 [#] Model Legend: (1) WT-42313, (2) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description C9C31 181P351080 C-ELEC - 10V 1000M-M PJ2J05 440C408010 PIN-JACK-BOARD-3P C9C32 181P352030 C-ELEC - 16V 47M-M...

  • Page 52: Screen Parts List

    MODELS: WS-42311 / WT-42413 [[#] Model Legend: (a) WT-42313, (b) WT-42413 Ref # Part # Part Name & Description Ref # Part # Part Name & Description SCREEN ASSEMBLY PARTS 491P136020 SCREEN-LENTICULAR 491P137020 LENS-FRESNEL 596C569010 SCREEN - BRACKET-CORNER 598D298010 SCREEN - BRACKET-MASK...
  • Page 62 Page 62...

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