Mitsubishi VS-60609, VS-55609, VS-50609, VS-70709, VS-45609 Service Manual

...

MITSUBISHI ELECTRIC

2001

Service Manual

PROJECTION TELEVISION VZ9 / VZ9+ CHASSIS

VZ9 MODELS

VS-45609 VS-50609 VS-55609

VZ9+ MODELS

VS-60719 VS-70709

VS-60609

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 Input : AC 120V, 60Hz

• Power : 200W Consumption

• Frequency : VHF 54 ~ 470MHz Range UHF 470 ~ 806MHz

• Antenna Input : VHF/UHF 75Ω unbalanced

Single axis input

• CRT Size :7"

• High Voltage : 32.0kV (at 0A)

• Speaker : [VZ9]

4" round type, full range 2 pcs. (8Ω 10W) [VZ9+] 5" round type, full range 2 pcs. (8Ω 10W)

• Cabinet : [Model] (H)x(W)x(D) Dimensions : [VS-45609] 48"x38.4"x22.2"

: [VS-50609] 50.4"x42.8"x23.8" : [VS-55609] 54.8"x46.4"x23.7" : [VS-60609] 60.8"x50.6"x29" : [VS-60719] 60.8"x50.6"x29" : [VS-70709] 70.5"x58.7"x29.4"

• 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 type) Y:1.0 Vp-p C:0.286Vp-p(BURST) 75Ω unbalanced

: Component Inputs (RCA Type)

Y: 1.0Vp-p Cr, Cb: 700mVp-p

• Weight : [VS-45609] 176 lbs [VS-50609] 198 lbs [VS-55609] 229 lbs [VS-60609] 259 lbs [VS-60719] 253 lbs [VS-70709] 369 lbs

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Road, Irvine, CA 92618-1904

• Output Level : VIDEO OUT JACK (RCA Type)

1.0Vp-p 75Ω unbalanced

: AUDIO OUT JACK (RCA Type)

-4.7dBm 4.7kΩ unbalanced

• Weight and dimensions shown are approximate.

• Design specifications are subject to change without notice.

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

CONTENTS

INTRODUCTION ................................................................................................................................5

PRODUCT SAFETY NOTICE ............................................................................................................. 5

SAFETY PRECAUTIONS ................................................................................................................... 6

DISASSEMBLY .................................................................................................................................. 7

Front Cabinet Components ............................................................................................................. 7

Rear Cabinet Components .............................................................................................................. 8

SERVICING THE LENTICULAR LENS AND FRESNEL SCREEN ....................................................... 9

Removal of the Lenticular Screen and Fresnel Lens ........................................................................ 9

Installation of the Lenticular Screen and Fresnel Lens ................................................................... 10

VS-70709 CABINET SEPARATION PROCEDURE ............................................................................ 11

SERVICING THE DIAMONDSHIELD

DiamondShieldTM Removal ............................................................................................................ 12

DiamondShieldTM Installation ......................................................................................................... 12

SERVICING PCBs ............................................................................................................................ 13

Chassis Removal & PCB Locations .............................................................................................. 13

Major Parts Locations ................................................................................................................... 13

CRT REPLACEMENT ....................................................................................................................... 14

CRT Removal ................................................................................................................................14

CRT Installation ............................................................................................................................ 15

ELECTRICAL ADJUSTMENTS ........................................................................................................ 17

Equipment .................................................................................................................................... 17

Initial Setup ................................................................................................................................... 18

LED Indicator Diagnostics ............................................................................................................. 19

Circuit Adjustment Mode............................................................................................................... 20

Convergence Adjustment Mode ..................................................................................................... 21

Adjustment Items List ................................................................................................................... 24

Test Points Locations ................................................................................................................... 27

Adjustment Procedures ................................................................................................................ 28

Audio Circuit ........................................................................................................................ 28

High Voltage Control ............................................................................................................ 29

Focus Adjustments .............................................................................................................. 29

CRT Adjustments ................................................................................................................. 30

Video Adjustments .............................................................................................................. 32

PIP Adjustments .................................................................................................................. 33

Cb, Cr Offset Adjustment ..................................................................................................... 34

Character Position ............................................................................................................... 34

Deflection/Convergence Geometry Presets .......................................................................... 35

Height and Vertical Linearity Adjustments ............................................................................ 36

Centering and Static Convergence ....................................................................................... 36

Convergence Geometry Adjustments ................................................................................... 37

Convergence Adjustments ................................................................................................... 38

r ........................................................................................... 12

Page 3

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

CHIP PARTS REPLACEMENT ......................................................................................................... 40

REPLACEMENT PARTS .................................................................................................................. 41

Parts Ordering .............................................................................................................................. 41

Critical and Warranty Parts Designation........................................................................................ 41

Parts Tolerance Codes .................................................................................................................. 41

Model Abbreviations ...................................................................................................................... 41

Quick Reference List .................................................................................................................... 42

SERVICE PARTS LIST .................................................................................................................... 43

CIRCUITRY BLOCK DIAGRAMS ..................................................................................................... 54

Power Supply ............................................................................................................................... 54

Video/Color Signal Path ................................................................................................................ 55

Sound Circuit ................................................................................................................................ 56

Deflection and High Voltage .......................................................................................................... 56

Protect Circuitry ............................................................................................................................ 57

Convergence Circuitry ................................................................................................................... 57

Control Circuitry ............................................................................................................................ 58

SCHEMATIC DIAGRAMS

PCB LAYOUT DIAGRAMS

Page 4

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

INTRODUCTION

This service manual provides service instructions for PTV Models VS-45609, VS-50609, VS-55609 and VS-60609 which use the VZ9 chassis, and PTV Model VS-60719 and VS-70709 which use the VZ9+ 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 understanding 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 on the schematic diagram 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.

Page 5

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

SAFETY PRECAUTIONS

NOTICE: Observe all cautions and safety related notes located inside the receiver cabinet and on the

receiver chassis.

WARNING:

1. Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is not thoroughly familiar with the precautions necessary when working on high voltage equipment.

2. Do not install, remove or handle the picture tubes in any manner unless shatterproof goggles are worn. People not so equipped should be kept away while the picture tube is being handled. Keep the picture tube away from the body while handling.

3. When service is required, observe the original lead dress. Extra precaution should be taken to assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those components that indicate evidence of overheating.

X-Radiation warning

The surface of the cathode ray tubes (CRTs) may generate X-Radiation, so take proper precautions when servicing. It is recommended that a lead apron be used for shielding while handling the CRT. Use this method if possible.

When replacing the CRTs, use only the designated replacement part since it is a critical component with regard to X-Radiation. High voltage must be set as prescribed under the section titled Electrical Adjustments.

Leakage current check

Before returning the receiver to the customer, it is recommended that leakage current be measured according to the following methods.

1. Cold Check

With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug

prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal part (i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a return path to the chassis should be a minimum of 1Mega Ohm. Any resistance below this value indicates an abnormal condition and requires corrective action.

2. Hot Check ...Use the circuit shown below to perform the hot check test.

1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after

connection, and with the switching devices of the receiver in their operating positions, measure the leakage current for both positions of switch S2.

2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the

switching devices of the receiver in their operating positions, measure the leakage current for both positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).

Page 6

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

CABINET DISASSEMBLY (FRONT VIEW)

*Refer to PARTS LIST for Part Numbers

1.Front Cabinet Disassembly

1. Remove the Speaker Grille by pulling forward.

2. Remove the Front-Board by removing 4 screws "a".

3. Remove the Screen Assembly by removing screws "b". Disconnect all cable harnesses between the Screen Assembly and the PCB-Signal.

4. Lift the Screen Assembly and pull up and away from the cabinet as shown.

Page 7

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

CABINET DISASSEMBLY (REAR VIEW)

2. Rear Cabinet Disassembly

1. Remove the Back Board by removing 8 screws "a" and 4 screws “b”.

2. Remove the Rear Board-1 by removing 4 screws "c".

3. Remove 4 screws "e" (two not shown) and 8 screws "d" securing the Light Box Assembly and the Board Shelves.

4. Remove the Board Shelves by lifting up and out.

5. Be certain that all cables and connectors between the Light Box Assembly and external items are disconnected (e.g. speaker plugs).

6. Slide the Light Box Assembly out of the cabinet.

Page 8

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS

1. Removal of the Lenticular Screen and Fresnel Lens

CAUTION: Wear gloves when handling the Lenticular Screen and the Fresnel Lens.

This prevents cuts and finger prints. Do not place the Fresnel Lens in the sun. This may cause fire and heat related injuries.

1. Remove the screen assembly as shown in the Cabinet Disassembly procedure. [Figure 1-1]

2. Remove the Screen Holder by removing screws (a). [Figure 3-1]

3. Slide the Lenticular Screen and Fresnel Lens from the Screen Frame.

Note: When separating the Lenticular Screen from the Fresnel Lens, use caution

while prying the Screen and Lens apart. Use a slot type screw driver, and remove the pressure sensitive, double sided tape.

Figure 3-1

Page 9

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

2. Installation of the Lenticular Screen and Fresnel Lens

Note: Store the Lenticular Screen and Fresnel Lens in a cool dry place. High humidity may

deform the Lenticular Screen and Fresnel Lens.

1. Apply double coated tape (Part # LENS-TAPE) along the top front edge of the Fresnel Lens as shown in figure 3-2. Refer to Table A for proper tape length.

2. Place the Fresnel Lens on top of the Lenticular Screen and apply pressure at the top edge to bond them together as shown in figure 3-2.

3. Install CUSHION-CORNER pads at the bottom corners on the back of the Fresnel Lens, as shown in figure 3-3.

To p

Bottom

( * X ) inch

Double Sided Tape (Part# LENS-TAPE)

Lenticular Screen

Fresnel Lens

Figure 3-2

Top

Bottom

To p

Fresnel Lens

Lenticular Screen

0.16 inch

* Tape Application Guide

MODEL

VS-45609 45" 36" VS-50609 50" 40" VS-55609 55" 44" VS-60609 60" 48" VS-60719 60" 48" VS-70709 70" 56"

SCREEN

SIZE

Table A

TAPE

LENGTH

Fresnel Lens

(Rear)

Bottom

CUSHION-CORNER(B)

Part #622D757060

CUSHION-CORNER(A)

Part #622D757050

Figure 3-3

Page 10

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

CABINET SEPARATION PROCEDURE (VS-70709)

Model VS-70709 cabinets are assembled in two pieces. These two pieces may be separated to allow easier delivery and setup.

Note:

ing and installing. DO NOT tilt the cabinet top while resting on the guide pins.

The Guide Pins under the cabinet top may break if mishandled. Keep the cabinet top straight when remov-

1c. VS-70709 Cabinet Separation Precedure

1. Remove the Screen Assembly and disconnect all cable harnesses between the Frame Assembly and the PCB-SIGNAL (refer to

Front Cabinet Disassembly

2. Remove 4 screws “a” securing the top and bottom cabinet sections (Figure 1-3).

3. Lift the cabinet top straight up until the guide pins are clear.

4. Carefully place the cabinet top on the floor.

5. Place the cabinet bottom in the desired location.

6. Reverse the procedure and mount the cabinet top on the cabinet bottom.

7. Reinstall the the Screen Assembly and connect all cable harnesses between the Screen Assembly and the PCB-SIGNAL.

1a.

Page 11

Figure 1-3

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

SERVICING THE DIAMONDSHIELD™

1. DiamondShield™ Removal Procedure

The location of the DiamondShieldTM molding clips may vary between models, top and bottom, or sides. Use the appropriate disassembly procedure given below.

Note:

Wear gloves when handling the DiamondShield™ to prevent finger prints.

Top & Bottom Molding Clips

1. Gently insert a small screwdriver between the DiamondShield™ and one end of the clip to pry the clip loose.

Side Molding Clips

1. Gently insert a small screwdriver between the DiamondShield™ and one end of the clip to pry the clip loose.

2. Remove both clips by pulling them toward you.

3. Carefully insert a small screwdriver into the gap at the top/center point of the Shield and pull the Shield slightly away from the unit. Place your hands at the points shown and gently bow the Shield toward you and remove from the unit. Then re-install the two clips.

2. DiamondShield™ Installation Procedure

*(See the Parts List for DiamondShield™ part numbers)

To install the DiamondShieldTM, reverse the above Removal Procedure.

2. Remove both clips by pulling them toward you.

3. Carefully insert a small screwdriver into the gap at the side/center point of the Shield and pull the Shield slightly away from the unit. Place your hands at the points shown and gently bow the Shield toward you and remove from the unit. Then re-install the two clips.

Page 12

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

SERVICING PCBs

Chassis Removal and PCB Locations

Chassis Removal

1) Remove 3 screws “a” from the Main Chassis.

2) Raise the two chassis locks on the inner sides of the Lightbox Assembly and slide the chassis towards the rear.

Major Parts Locations

Page 13

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

CRT REPLACEMENT

1. Removal of the CRT

Caution! High voltage should be completely discharged prior to CRT removal.

Since The CRTs receive high voltage from the CR Block, discharge by shorting the open end of the respective high voltage cable to chassis ground.

Note: Refer to figures 1-1 through 2-2 when performing steps 1 through 4.

1. Remove the Speaker Grille, Front Board, and Screen Assy.

2. Remove the Back Board.

3. Remove the Anode Lead Wire from the CR Block.

4. Remove the PCB-CRT.

5. Remove 4 hex-screws "a" retaining the Optical Unit. [Figure 5-1]

6. Remove 4 screws "b" retaining the Lens.

Note: DO NOT loosen the RED screws. Doing so will break the seal between the

C-Element and the # 6 Lens, causing leakage of the CRT Coolant.

7. Remove 4 screws "c" retaining the CRT. [Figure 5-2]

8. Remove the Deflection Yoke from the neck of the CRT. [Figure 5-7]

Figure 5-1

Figure 5-2

Note: The 4 spring-loaded screws shown

in Fig 5-2 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

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

2. Installation of the CRT

Note: The replacement CRT is supplied as an assembly comprised of the CRT and the

Inner Lens with the space between them filled with ethylene glycol. Care should be taken during handling and installation to prevent shock from disrupting the seal or alignment between the CRT and Inner Lens. [Figure 5-3]

Figure 5-3

Note: The CRT fixing screws should not be loosened nor should they be removed. [Figure 5-4]

Figure 5-4

1. Carefully position the replacement CRT and fasten in place using 4 screws "d". [Figure 5-6]

Figure 5-6

Figure 5-5

Page 15

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

2. Install the Deflection Yoke on the CRT neck. [Figure 5-7]

3. Install the Lens that was removed in steps 5 and 6 of Removal Of The CRT. [ Figures 5-1 and 5-2 ] a) Position the Lens so that the Label faces the direction shown in Figure 5-8. b) Install the mounting screws. [Figure 5-1]

4. Install the PCB-CRT.

5. Insert the Optical Unit into the Light Box Assembly.

6. Insert the Anode Lead Wire into the Flyback Transformer.

7. Re-clamp the Lead Wire in its original position.

Figure 5-7

Figure 5-8

Adjustment procedures after replacing the CRT(s)

• CRT Cut Off / White Balance Adjustment

• Static Convergence Adjustment

• Dynamic Convergence Adjustment

Page 16

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

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

• Frequency Counter

• Direct Current Voltmeter

Direct Current Power Supply

• Multiplex Audio Signal Generator

• Direct Current Ampere Meter

2. Test Signal

A. Monoscope Signal

Note: If you do not have

a monoscope signal source, connect the unit to a VCR and play a Monoscope *alignment tape. (* Part Number: 859C568060)

B. Color Bar Signal

Use the color bar signal shown below, unless otherwise specified in this manual.

100%

75%

40%

Monoscope Signal

Split-Field Color Bars (100% window)

Page 17

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709

3. Initial Setup

1. 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", "1", "7", "0" in sequence to select the "OPTION MENU" display.

3. Press the "ADJUST" button to select "INITIAL."

4. Press "ENTER."

NOTE: At this time channel 3 is automatically selected.

OPTION MENU

INITIAL

POWER RESTORE :OFF DIRECT KEY MODE :OFF VIDEO MUTE TIME OUT :OFF

(MENU-0-1-7-0)

2. Default Settings

INITIAL SETTINGS

Item Description Initial Setting Item Description Initial Setting

1 Input TV 11 TV Brightness 50% 2 Receiving Channel 003 CH TV Sharpness 50% 3 TV/CATV CATV TV Color 50% 4 QV Recalls previous ch. 12 Speaker ON 5 Channel Memory All CH (0,0) 13 Background Gray 6 V-CHIP LOCK 14 Closed Caption On if Mute

Lock by Time OFF 15 PIP SOURCE TV Lock Time 12:00 AM 16 PIP POSITION Lower Right

UnlocK Time 12:00 AM 17 VIDEO MUTE OFF 7 Lock Channels OFF 18 INPUT, NAME All inputs name OFF 8 LOCK CODE - - - - 19 TIMER OFF 9 VOLUME 30% 20 SQV All Ch Clear (deleted)

10 AUDIO FUNCTIONS 21 SYSTEM 4* OFF

TV Listen to STEREO 22 LANGUAGE English

TV Bass 50% 23 Name The Channels All Labels Cleared

TV Treble 50% 24 Locked to Input No

TV Balance 50% 25 External Audio System No

TV Surround OFF 26 Vol. change by AV Rec. N/A

TV Level sound OFF 27 Auto Clock Setting OFF

11 VIDEO FUNCTIONS 28 Front Lock Function OFF

TV Tint 50% 29 PIP Demo Mode OFF

TV Color temp High 30 Clock Time - -:- -

TV Noise Reduction OFF 31 Set Day Sunday

TV Contrast 100%

* Note: System 4 in VS-60719 & VS-70709 only

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