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Parts Info Change

See Below

KR01461

SCREEN ASSY

#20

KS02022

43" Mirror Glass for Serial Numbers Less than V0E002684

#20

KS02024

43" Mirror Glass for Serial Numbers Greater than V0E002684

IPA

No. 0114

CONTENTS
SAFETY PRECAUTIONS ............................................. SERVICING PRECAUTIONS ........................................... TECHNICAL CAUTIONS .............................................. SPECIFICATIONS ................................................... CIRCUIT PROTECTION .............................................. GENERAL INFORMATION ............................................ CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS ..................... CAUTIONS WHEN CONNECTING/DISCONNECTING THE HV CONNECTOR SERVICE ADJUSTMENTS ............................................ TROUBLESHOOTING ............................................... PROTECTION CIRCUIT BLOCK DIAGRAM ............................... BASIC CIRCUIT DIAGRAM ........................................... PRINTED CIRCUIT BOARDS .......................................... BLOCK DIAGRAM .................................................. WIRING DIAGRAM .................................................. EXPLODED VIEW .................................................. REPLACEMENT PARTS LIST. ......................................... .3 .6 10 11 11 12 .13 .16 .17 .31 .38 .39 53 56 57 .61 .62

.....

CAUTION:

Before servicing this chassis, it is important that the service technician read the "Safety Precaution" and "Product Safety Notices" in this service manual.

SAFETY NOTICE USE ISOLATION TRANSFORMER WHEN SERVICING Components having special safety characteristics are identified by a Aon the schematics and on the parts list in this Service Data and its supplements and bulletins. Before servicing the chassis, it is important that the service technician read and follow the "Safety Precautions" and "Product Safety Notices" in this Service Manual. *For continued x-radiation protection, replace picture tube with original type of Hitachi approved equivalent type.

SPECIFICATIONS AND PARTS ARE SUBJECTTO CHANGE FOR IMPROVEMENT

PROJiCTlON
APRIL 1999

COLOR TELEVISION
HHEA-MANUFACTURING DIVISION

SAFETY NOTICE USE ISOLATION TRANSFORMER WHEN SERVICING
Components having special safety characteristics are identified by anon the schematics and on the parts list in this service manual and its supplements and bulletins. Before servicing this chassis, it is important that the service technician read and follow the "Safety Precautions" and the "Product Safety Notices" in this Service Manual. For continued X-Radiation protection, replace picture tube with original type or Hitachi approved equivalent type.

This Service Manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void warranty. If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the repair to a qualified service technician.

WARNING
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive may cause birth defects or other reproductive harm (California Health and Safety Code, Section 25249.5). toxicant which

When servicing or handling circuit boards and other components which contain with solder. Also, when soldering do not inhale any smoke or fumes produced.

lead in solder, avoid unprotected

skin contact

This television

receiver

provides

display

of television

closed captioning

in accordance

with section

15.119

of the FCC rules.

SAFETY

PRECAUTIONS

1. Before returning an instrument to the customer, always make a safety check of the entire instrument, including but not limited to tl-te following items. a. Be sure that no built-in protective devices are defective and/or have been deleted during servicing. (1) Protective shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2) When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place all protective devices, including but not limited to, nonmetallic control knobs, insulating fishpaper, adjustment and compartment covers/shields, and isolation resistor/capacitor networks. Do not operate this instrument or permit it to be operated without all protective devices correctly installed and functioning. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damage. b. Be sure that there are no cabinet openings through which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to (1) spacing between the picture tube and cabinet mask, (2) excessively wide cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly secured cabinet back cover.
C.

REVERSED (USING [email protected] ADAPTER PLUS AS REQUIRED)

AC Leakage

Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER OR BEFORE CONNECTING THE ANTENNA OR ACCESSORIES. e. High Voltage - This receiver is provided with a hold down circuit for clearly indicating that voltage has increased in excess of a predetermined value. Comply will all notes described in this Service Manual regarding this hold down circuit when servicing, so that this hold down circuit may correctly be operated. f. Service Warning -With maximum contrast, operating high voltage in this receiver is lower than 31.5 kV. In case any component having influence on high voltage is replaced, confirm that the high voltage with maximum contrast is lower than 31.5 kV. To measure H.V. use a high impedance H.V. meter. Connect (-) to chassis earth and (+) to the CRT anode button. (See the following connection diagram.) Note: Turn power switch off without fail before the connection to the anode button is made.

Antenna Cold Check -With the instrument AC plug removed from any AC source, connect an electrical jumper across the two AC plug prongs. Place the instrument AC switch in the on position. Connect one lead of an ohmmeter to the AC plug prongs tied together and touch the other ohmmeter lead in turn to each tuner antenna input, exposed terminal screw and, if applicable, to the coaxial connector. If the measured resistance is less than 1.0 megohms or greater than 5.2 megohms, an abnormality exists that must be corrected before the instrument is returned to the customer. Repeat this test with the instrument AC switch in the off position.

d. Leakage Current Hot Check - With the instrument completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) Cl01 .O Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument AC switch first in the on position and then in the off position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle bracket, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamps. Reverse the instrument power cord plug in the outlet and repeat test.

Chassis ground

I I

I I
/ Deflection

/
P.W.B.

High tmpedance H.V. meter

FBT (T702)

\ \ High voltage connector

3

g. X-radiation - TUBE: The primary source of Xradiation in this receiver is the picture tube. The tube utilized for the above mentioned function in this chassis is specially constructed to limit X-radiation emissions. For continued X-radiation protection, the replacement tube must be the same type as the original, Hitachi approved type. When troubleshooting and making test measurements in a receiver with a problem of excessive high voltage, avoid being unnecessarily close to the picture tube and the high voltage component. Do not operate the chassis longer than is necessar to locate the cause of excessive voltage.

h. X-radiation Shield 1. This receiver is provided with X-ray shield plates for protection against X-radiation. Do not remove X-ray shield plates A, B, C, or D shown in Fig. 1 unnecessarily, when troubleshooting and/or making test measurements. 2. To prevent X-radiation, after replacement of picture tube and lens, confirm these components to be fixed correctly to bracket and cabinet, and not to be taken off easily.

R-Lens G-Lens B-Lens

Shield

Plate A

/
Shield Plate C

Detailing Fig. 1. Detailing

X-radiation X-radiation

shield Shield

Read and comply with all caution and safety-related notes on or inside the receiver cabinet, on the receiver chassis, or on the picture tube.

Design Alteration Warning - Do not alter or add to the mechanical or electrical design of this TV receiver. Design alterations and additions including but not limited to circuit modifications and the addition of items such as auxiliary audio and/or video output connectors, might alter the safety characteristics of this receiver and create a hazard to the user. Any design alterations or additions may void the manufacturer's warranty and may make you, the servicer, responsible for personal injury or property damage resulting therefrom.

Components, parts, and/or wiring that appear to have overheated or are otherwise damaged should be replaced with components, parts, or wiring that meet original specifications. Additionally, determine the cause of overheating and/or damage and, if necessary, take corrective action to remove any potential safety hazard. PRODUCT SAFETY NOTICE - Many TV electrical and mechanical parts have special safety-related characteristics some of which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified in Hitachi service data by shading on schematics and by a A in the parts list. Use of substitute replacement that does not have the same safety characteristics as the recommended replacement part in Hitachi service data parts list might create shock, fire, and/or other hazards. Product safety is under review continuously and new instructions are issued whenever appropriate. For the latest information, always consult the appropriate current Hitachi service literature. A subscription to, or additional copies of service literature may be obtained at a nominal charge from Hitachi.

Picture Tube Implosion Protection Warning - The picture tube in this receiver employs integral implosion protection. For continued implosion protection, replace the picture tube only with one of the same type number. Do not remove, install, or otherwise handle the picture tube in any manner without first putting on shatterproof goggles equipped with side shields. People not so equipped must be kept safely away while picture tubes are handled. Keep the picture tube away from your body. Do not handle the picture tube by its neck.

5. Hot Chassis Warning - a. Some TV receiver chassis are electrically connected directly to one conductor of the AC power cord and may be safely serviced without an isolation transformer only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC power source. Confirm that the AC power plug is inserted correctly with an AC voltmeter by measuring between the chassis and a known earth ground. If a voltage reading in excess of 1 .OV is obtained, remove and reinsert the AC power plug in the opposite polarity and again measure the voltage potential between the chassis and a known earth ground. b. Some TV receiver chassis normally have 85V AC (RMS) between chassis and earth ground regardless of the AC plug polarity. These chassis can be safely serviced only with an isolation transformer inserted in the power line between the receiver and the AC power source, for both personnel and test equipment protection. c. Some TV receiver chassis have a secondary ground system in addition to the main chassis ground. This secondary ground system is not isolated from the AC power line.The two ground systems are electrically separated by insulating material that must not be defeated or altered.

6. Observe original lead dress. Take extra care to assure correct lead dress in the following areas: a. near sharp edges, b. near thermally hot parts-be sure that leads and components do not touch thermally hot parts, c. the AC supply, d. high voltage and e. antenna wiring. Always inspect in all areas for pinched, out-of-plate, or frayed wiring. Do not change spacing between components and the printed circuit board. Check AC power cord for damage. 5

SERVICING
CAUTION: Before servicing instruments covered by this service data and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Guidelines 1. Always unplug the instrument AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly. b. Disconnecting or reconnecting any instrument electrical plug or other electrical connection. c. Connecting electrolytic CAUTION: a test substitute in parallel with an capacitor in the instrument. A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. the picture tube anode.

PRECAUTIONS
Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heatsinks are correctly installed. Always connect the test instrument ground lead to the appropriate instrument chassis ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last. Use with this instrument only the test fixtures specified in this service data. CAUTION: Do not connect the test fixture ground strap to any heatsink in this instrument. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some fietdeffect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped devices, place the assembly on a conductive such as aluminum foil, to prevent electrostatic buildup or exposure of the assembly. 3. Use only a grounded-tip desolder ES devices. soldering with ES surface charge

d. Discharging

2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc.) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc." The H.V. Distribution Box has an internal 400MR resistor (bleeder resistor) connected from the high voltage to ground. After power is removed from the instrument the high voltage will discharge through the high voltage bleeder resistor. If the tubes have high voltage after power is removed, then the bleeder resistor is defective or the bleeder ground is disconnected. 3. Discharge B outputs connecting degaussing the point conngcted, insulated distribution handle to the picture tube's anode at any of the R, G, or on the H.V. Distribution Box only by (a) first one end of an insulated clip lead to the or kine aquadag grounding system shield at where the picture tube socket ground lead is and then (b) touch the other end of the clip lead to the picture tube high voltage box R, G, or B output, using an insulated avoid personal contact with high voltage. on or near this instrument or any

iron to solder

or

4. Use only can anti-static type solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ES device. 5. Do not generate devices. use freon-propelled electrical charges chemicals. These sufficient to damage can ES

4. Do not spray chemicals of its assembfies.

5. Unless specified otherwise in these service data, clean electrical contracts by applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable nonabrasive applicator: 10% (by votume) Acetone and 90% (by volume) isopropyl alcohol (90%99% strength). CAUTION: This is a flammable mixture. Unless specified otherwise in these service data, lubrication of contacts is not required. 6. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service data might be equipped. 6

6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material.) 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric OPthe tifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)

General Soldering Guidelines 1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range 500F to 600F. 2. Use an appropriate gauge of resin-core of 60 parts tin/40 parts lead. 3. Keep the soldering solder composed

Removal 1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC. Replacement 1. Carefully insert the replacement 2. Carefully bend each and solder it. 3. Clean the soldered (It is not necessary

iron tip clean and well-tinned.

IC in the circuit board. the circuit foil pad

4. Thoroughly clean the surfaces to be soldered. Use a small wire-bristle (0.5 inch or 1.25 cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners. 5. Use the following desoldering technique. a. Allow the soldering iron tip to temperature (500F to 600F).

IC lead against

areas with a small wire-bristle brush. to reapply acrylic coating to areas.)

reach

normal "Small-signal" Discrete Transistor Removal/Replacement 1. Remove the defective transistor by clipping its leads as close as possible to the component body. 2. Bend into a "U" shape the end of each of three remaining on the circuit board. 3. Bend into a "U" shape 4. Connect to corresponding crimp the "U" metal contact, the replacement transistor leads

b. Heat the component lead until the solder melts. Quickly draw away the melted solder with an anti-static, suction-type solder removal device or with solder braid. CAUTION: Work quickly to avoid overheating the circuit board printed foil. 6. Use the following soldering technique. a. Allow the soldering iron tip to temperature (500F to 600F).

leads.

reach

normal

replacement transistor leads to the leads extending from the circuit board and with long nose pliers to insure metal to then solder each connection.

b. First, hold the soldering iron tip and solder strand against the component lead until the solder melts. c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil or components. d. Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush.

Power Output Transistor Devices Removal/Replacements 1. Heat and remove all solder from around the transistor leads. 2. Remove 3. Carefully the heatsink mounting screw (if so equipped). from the circuit board.

remove the transistor

4. Insert new transistor 5. Solder each transistor 6. Replace heatsink.

in circuit board. lead, and clip off excess lead.

Diode Removal/Replacement 1. Remove defective diode by clipping possible to diode body. 2. Bend the two circuit board. remaining leads

its leads as close as

perpendicularly

to the

3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board.
Use Solding Iron to Pry Leads

4. Securely IC Removal/Replacement Some Hitachi unitized chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above.

crimp each connection

and solder

it.

5. Inspect (on the circuit board copper side) the solder joints of the two "original leads". If they are not shiny, reheat them and, if necessary, apply additional solder.

Fuses and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of circuit board hollow stake. 2. Securely crimp leads of replacement stake l/8 inch from top. component around

At Other Connections Use the following technique to repair defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board.

3. Solder the connections. CAUTION: Maintain original spacing between the and adjacent replaced component components and the circuit board, to prevent excessive component temperatures. Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board, causing the foil to separate from, or "lift-off," the board. The following guidelines and procedures should be followed whenever this condition is encountered. In Critical Copper Pattern Areas High component/copper pattern density and/or special voltage/current characteristics make the spacing and integrity of copper pattern in some circuit board areas more critical than in others. The circuit foil in these areas is designated as Critical Copper Pattern. Because Critical Copper Pattern requires special soldering techniques to ensure the maintenance of reliability and safety standards, contact your Hitachi personnel. At IC Connections To repair defective copper pattern at IC connections, use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections.) 1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary.) 2. Carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern.

DEFECTIVE

Insulated Remove Remove condition

Jumper

Wire

the defective copper pattern with a sharp knife. at least l/4 inch of copper, to ensure hazardous will not exist if the jumper wire opens.

Trace along the copper pattern from both wire sides of the pattern break and locate the nearest component directly connected to the affected copper pattern. Connect insulated 20-gauge jumper wire from the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch components or sharp edges. Frequency Synthesis (FS) Tuning Systems Aiways-unplug the &.trument-Ad power cord before disconnecting or reconnecting FS tuning system cables and before removing or inserting FS tuning system modules. The FS tuner must never be disconnected from the FS tuning control module while power is applied to the instrument. When troubleshooting intermittent problems that might be caused by defective cable connection(s) to the FS tuning system, remove the instrument AC power as soon as the defective connector is found and finish confirming the bad connection with a continuity test. This procedure will reduce the probability of electrical overstress of the FS system semi-conductor components.

Install

Jumper

Wire and Solder

3. Bend a small "U" in one end of a small-gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection. 4. Route the jumper wire along the path of the cut-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area, and clip off any excess jumper wire.

8

NOTE: These components are affixed with glue. Be careful not to break or damage any foil under the component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the comoonent loose. I

Leadless Chip Components (surface mount)
Chip components must be replaced with identical chips due to critical foil track spacing. There are no holes in the board to mount standard transistors or diodes. Some chip capacitor or resistor board solder pads may have holes through the board, however the hole diameter limits standard resistor replacement to 118 watt. Standard capacitors may also be limited for the same reason. It is recommended that identical chip components be used.. Chip resistors have a three digit numerical resistance code -1st and 2nd significant digits and a multiplier. Example: 162 = 1600 or 1.6K resistor, 0 = 0 (jumper). Chip capacitors generally do not have the value indicated on the capacitor. The color of the component indicates the general range of the capacitance. Chip transistors are identified by a two letter code. The first letter indicates the type and the second letter, the grade of transistor. Chip diodes have a two letter identification code as per the code chart and are a dual diode pack with either common anode or common cathode. Check the parts list for correct diode number.

How to Replace Flat-IC -Required Tools. Soldering iron iron wire or small awl De-solder braids Magnifier 1. Remove the solder from all of the pins of a Flat-IC by using a de-solder braid.
l l l

Flat-K

De-Solder Braid Soldering Iron

2.

Put the iron wire under the pins of the Flat-IC and pull it in the direction indicated while heating the pins using a soldering iron. A small awl can be used instead of the iron wire. ,
Iron Wire Awl

3.

Component
1. 2. 3.

Removal

Use solder wick to remove solder from component end caps or terminals. Without pulling up, carefully twist the component with tweezers to break the adhesive. Do not reuse removed leadless or chip components since they are subject to stress fracture during removal .

Remove the solder from all of the pads of the Fiat-K by using a de-solder braid.

Chip Component
1. 2.

Installation

4.

Put a small amount of solder on the board soldering pads. Hold the chip component against the soldering pads with tweezers or with a miniature alligator clip and apply heat to the pad area with a 30 watt iron until solder flows. Do not apply heat for more than 3 seconds 5. Chip Components

Position the new Flat-IC in place (apply the pins of the Flat-IC to the soldering pads where the pins need to be soldered). Properly Polarity Symbot determine the positions of the soldering pads and pins by correctly aligning the polarity symbol.

Solder all pins to the soldering tipped soldering iron. ..

pads using a fine

1ST DIGIT

6. Check with a magnifier for solder bridge between the pins or for dry joint between pins and soldering pads. To remove a solder bridge, use a de-solder braid as shown in the figure below.

MH DIODE

RES tSTOR

Bridge Solder 9

oldering Iron

TECHNICAL
High Voltage limiter circuit operation check. Turn off TV and connect jig as shown in Figure 2. Adjust jig fully counter-clockwise for minimum resistance. Set the AC input to 120V AC and turn on TV. Confirm test pattern on CRT is a usable slowly adjust jig until the picture disappears down. picture, then and TV shuts

CAUTIONS
4. When the limiter circuit is operating properly, High Voltage will be less than 36.5 kV at 0.6mA when TV shuts down. 5. Turn off set immediately after checking to reset circuit operation. shutdown circuit.

6. Unplug set for one minute Remove jig and voltmeter.

Chassis \ I 0 \ High voltage connector Deflection P.W.B. High impedance H.V. meter I FBT (T702)

(Disconnect the # @) pin of 1905 from +B line. Connect jig (15wZ VR) between +B line and # @

pin of 1905)

+line 6 c!d
POWER/DEFLECTION

1905 #l pin

+l!T
15KRVR li Jig

@

PWB

Fig. 2. Deflection/Power

P.C.B.

10

Model: Cathode-Ray Tube:

50GX49B

Audio Input: Stereo Audio Output:

470 mVrms, 47 k Ohm 470 mVrms, 1 k Ohm

R=l80DLB22R G=i 80DLB22G B=180DLB22B

Audio Output Power:
Front 12 watts at 10% distortion, 8 ohm Impedance

Power Input: Power Consumption:

120 volts AC, 60 Hz 184 Watts - Maximum 152 Watts - Operating

Max output - 24 watts

Anode Voltage:

35.0 + 1.5kv (contrast, brightness=max) 205 cd/m2 (white screen) 2 Woofers - 5 inch

Antenna Impedance:

75 ohm Unbalanced VHF / UHF / CATV

Brightness:

Receiving Channel:

BAND VHF UHF EXT. Mid CATV Mid. CATV Super CATV Hyper

G!d 2-13 14-69 (A-5)-(A-l), A-l J-W (W+l)-(W+28) 4+

Speakers:

(12 cm) round

Dimension:
Height (in.)

50GX49B
51 718 43 `1.J 23 314 185

Width (in.) Depth (in.) Weight (Ibs.)

Intermediate Frequency:

Picture I-F Carrier 45.75 MHz Sound I-F Carrier 41.25 MHz Color Sub Carrier 42.17 MHz

Circuit Board Assemblies:
C.P.T. (B) P.W.B. Terminal P.W.B. C.P.T. (G) P.W.B. C.P.T. (R) P.W.B. Signal P.W.B. Signat Sub P.W.B. VM P.W.B. SP Matrix P.W.B. Power/Deflection P.W.8. Control P.W.B.

Video Input:

1 Volt p-p, 75 Ohm 1 Volt p-p, 75 Ohm (Y) 0.7 Volt p-p, 75 Ohm, (Cb, Cr)

Video Output:

1 Volt p-p, 75 ohm

CARCUlT PROTECTION
CAUTION:
Below is an EXAMPLE only. See Replacement Parts List for details. The following symbol fuse indicates fast operation fuse (to be replaced). Fuse ratings appear within the symbol. near the

Example:

F901

"RISK OF FIRE - REPLACE FUSE AS MARKED"
11

The rating of fuse F901 is 5.OA - 125V. Replace with the same type fuse for continued against fire.

protection

GENERAL

INFORMATION

TVNideo

Source

Selector

Digital Array

Fig. 3. Control Panel

Rear Speaker Terminals

/
C)

_ S-Video Inputs

\

C

J

Surround Switch

I

Audio Antenna Inputs/Outputs Inl;uts 1 and 2 output
Panel

Variable Output

Fig. 4. Rear Connections

12

CUSTOMIZED
Select VIDEO

PICTURE AND SOUND ADJUSTMENTS
and improve picture quality.

to adjust picture settings

CURSOR

I

'
CONTRAST BRIGHTNESS COLOR TINT SHARPNESS RESET ADVANCED SETTINGS 41',75% 4-I, 4-I) 4---I 4-I, 0 50% 50% 50%

I

CURSOR

I

'
CONTRAST BRIGHTNESS COLOR TINT SHARPNESS RESET ADVANCED SETTINGS 4-b 4-b 4-b 4---r 4-b cl 98% 50% 50% 50%

'

I

MENU

IT0

MENU

BAR

TO QUIT

1 EXIT

MENU

IT0

MENU

BAR

TO

QUIT

1 EXIT

Use the CURSOR A or v buttons to highlight the function Press the CURSOR 4 or b buttons to adjust the function. Press EXIT to quit menu.

to be adjusted.

NOTE:

l

l

If CONTRAST is selected, you are adjusting CONTRAST. The additional menu items BRIGHTNESS, COLOR, TINT, and SHARPNESS can be selected and adjusted in the same manner. Contrast and Brightness adjustments will affect only the main picture. These adjustments will not affect the sub-picture (PIP).

Use this function affect the picture

to change the contrast between when ADVANCED SETTINGS

black ULTRA

and white levels Al is OFF.

in the picture.

This

adjustment

will only

BRIGHTNESS

Use this function

to adjust

overall

picture

brightness.

COLOR

Use this function

to adjust

the level

of color

in the picture.

Use this optimum

function picture

to adjust flesh tones so they appear quality when using the COMPONENT:

natural. Y-C&R

(It may be necessary Input 2 jacks).

to adjust

TINT

to obtain

SHARPNESS

Use this function

to adjust

the amount

of fine detail

in the picture.

RESET

When

RESET

is selected,

press

CURSOR

b to return

video

adjustments

to factory

preset

conditions.

13

Select

AUDIO

SETTINGS

to adjust

the TV to your

preference

and

to improve

the sound

quality.

CURSOR

BASS TREBLE BALANCE RESET ADVANCED SETTINGS

4-I) 4-I) 4---r

72% 50%

CURSOR

q

BASS TREBLE BALANCE RESET ADVANCED SETTINGS

4r-1,90% 4-I, 4---r 0

50%

4ENU

IT0

MENU

BAR

TO

QUIT

1 EXIT

JENU

(TO

MENU

BAR

TO

QUIT

1 EXIT

Use CURSOR A or v to highlight Press CURSOR 4 or b to adjust Press EXIT to quit menu.

the function the function.

to be adjusted.

NOTE:

If BASS selected

is selected and adjusted

you are adjusting BASS. in the same manner.

The

additional

menu

items

TREBLE

and

BALANCE

can

be

piiT-

This

function

controls

the

low frequency

audio

to all speakers.

This

function

controls

the high

frequency

audio

to all speakers.

v

This function output.

will control

the

left to right

balance

of the

TV

internal

speakers,

the

AUDIO

TO

HI FI

E

When RESET conditions.

is selected,

press

CURSOR

b

to

return

audio

adjustments

to

factory

preset

14

1

DIGITAL ARRAY

1

4

Use the number buttons to select which point to adjust: Q - Upper Left, Q Q - Center, 8 - Center Right, Q - Bottom Left, @I- Bottom Middle, a Four lines surrounding adjusted. Press the CURSOR a crosshatch indicate the point being adjusted.

- Upper Middle, Q - Bottom Right.

- Upper Right, (20 - Center Left, lines indicates the color being

the color of these surrounding

buttons to move the displayed

color up, down, left or right.

Press MENU to change the color you want to adjust (Red or Blue). Press the front panel DIGITAL ARRAY button or the remote control MOVE button when adjustment adjustment into memory. is done. This will save your

15

CAUTIONS

WHEN CONNECTING

/ DISCONNECTING

THE HV CONNECTOR

Perform the following when the HV connector (anode connector) is removed or inserted for CPT replacement, etc.

Anode connector

Deflection P.W.B.

FBT

Roll out silicon cover from FBT's contact area slowly. the connector about 90 degrees following the arrow (0 position), push the connector slightly towards the case. (Fig. A)

Fig. A

Silicon cover

3.

Remove the connector slowly by pulling it away from the case.

Fig. B

During Insertion 1. Please refer to direction for insertion as shown in Fig. B (L position). Insert connector until "CLICK" sound is heard. 2. Make sure the connector is pressed right in, so that it has a good contact with the spring. 3. Confirm the contact by pulling the connector slightly. (Don't pull hard because it may damage the connector). 4. Cover the high voltage output by carefully pushing silicon cover onto it. (Don't turn the connector). (REMARK) Make sure the silicon cover is covering the high voltage output.

1.

A

d

I

Silicon Cover less than 1 mm

16

SERVICE ADJUSTMENTS
1. ASSEMBLED P.W.B. ADJUSTMENT ..................................................... l-l. Memory Initialization ............................................................ l-2. Comb Filter Operation Check ..................................................... .............................................. l-3. Sub Picture (PIP) Position Adjustment .18 .18 .18 .18

2. FINAL 2-1. 2-2. 2-3. 2-4. 2-5. 2-6 2-7. 2-8. 2-9. 2-10. 2-11. 2-12. 2-13. 2-14.

ASSEMBLY ADJUSTMENT ...................................................... FocusAdjustment...............................................................l White Balance Adjustment ....................................................... Sub Brightness Adjustment ...................................................... Sub Picture White Balance Adjustment .............................................. SP Matrix Check ............................................................. Raster Inclination Adjustment (Deflection Yoke) ........................................ Raster Position Adjustment ....................................................... Vertical Size Adjustment (R630) ................................................... Horizontal Size Adjustment (R603) ................................................. BeamAlignment................................................................2 Beam Shape Adjustment ....................................................... Static Focus Adjustment ......................................................... ........................................................ Blue Defocus Adjustment Digital Convergence Adjustment ................................................... 2-14-1. Phase Adjustment (service mode) ....................................... 2-l 4-2. Raster Position Adjustment ............................................ 2-14-3. Convergence Point Adjustment ......................................... 2-l d-4 Digital Convergence Remote Control .....................................

.19 9 .20 .20 .21 ..2 1 .21 .22 .22 .23 3 ..2 3 .24 .24 .24 .25 .25 .26 .26

3. ADJUSTMENT POINT ................................................................ 3-1. CRT (R)(G)(B), Cabinet Locations ................................................... 3-2. Main Chassis (Signal P.W.B.) ....................................................... 3-3. Main Chassis (Power/Deflection P.W.B.) ............................................... 3-4. CPT (R)(G)(B), Focus Pack, Control P.W.B. ............................................

.27 .27 .28 .29 .30

17

1. ASSEMBLED P.W.B. ADJUSTMENT 1 .l Memory Initialization Adjustment procedure (1) Press INPUT key on Control Panel and then Power On to access Video Chroma adjustment mode. (2) Receive signal on main picture. (3) Check the OSD according to table below, using Av buttons on Remote Control.
P.01 SERVICE -SUB CONT SUB COLOR CINT SUB SHARP EXT RGB BRIGHT EXT RGB CONT BRIGHTNESS SUB BRIGHT ADJ. INITIAL SET 0 p.02 G DRIVE GAIN B DRIVE GAIN H POSITION AFC G H BLK END PHASE V BLK PHASE V FREQUENCY V POSITION R-Y POSITION R-Y LEVEL G-Y LEVEL GPPHS AP92 __ 0 AFL 1A 40 38 40 -__ 60 80 0 P.04 DC T.C. POINT DC T.C. RATIO DC T.C. LIMIT B.E P LIMIT B.E. P. POINT1 B.E. P. POINT2 B.L.S. B.L.C. B.S.G. B.D.L. BEARE DC GAIN P.05 WPDL HI BRT OSACL APACON PEAK WHITE PEAK D. ABL POINT D. ABL GAIN ABL POINT ABL GAIN [BLANK) VAPINV VAPGAIN PO6 ii POSI (CENT) V POSI (CENT) H DLY OSD V POSI (CENT) 1 ST L AFTER V H DLY VBI VIDEO FIELD CLAMP DELAY INITIAL SET 0 AP92 0 0 0 0 5 0 0 1 0 0 0 6

1.2 Comb filter operation check Adjustment preparation (1) Receive the color bar signal at the regular tuning point. (2) Set the CONTRAST control to MAX and the other controls to center. (3) Set the Al to OFF Adjustment procedure (1) Check that between the color bars there are line dots every second color bar as shown in the drawing.

*

AP92

1
F( 1 AP92 1 04 07 A 5 29 2 1 34 18

I

Check @and

@line

dots.

1.3 Sub-picture (PIP) position adjustment Adjustment preparation (1) Select signal on main picture. (2) Video settings have to be at normal condition. Adjustment procedure (1) Press the INPUT and POWER button on Control Panel at same time to access VIDEO CHROMA ADJUST mode. (2) Select H POSI and V POSI using Av buttons. (3) Adjust the H POSI (HORIZONTAL) and V POSI (VERTICAL) position using 4 b buttons. (4) Press MENU button to exit VIDEO CHROMA ADJUST mode. (5) Select single PINP mode and move the sub picture, using the MOVE button. Distance between PINP and edge of screen should be equal when moved. If it is not, repeat (1) - (5). NOTE: Check the position of MULTI PINP mode. Check the right edge of the sub pictures for MV-4 to make sure there is no separation between the MULTI PINP and the edge of the screen.

C TRAP TOF FQ TOF Q COLOR SYSTEM DY GAIN

0 0 0 0 9

*: Adjustable data Others: Fixed data (be careful not to change) (4) Press MENU key to exit VIDEO CHROMA ADJUST mode. NOTE: (1) If there is a different value than shown in table above, for fixed data, adjust it using 4 b buttons (only in this case). (2) When exchanging microprocessor and TV is turned on for first time, it requires initialization of VIDEO CHROMA ADJ on Pl and P6. (3) Should be changed to OFF for FIRST TIME TOUR at first Power ON by pressing MENU key during FIRSTTIME TOUR running.

2. FINAL ASSEMBLY ADJUSTMENT 2.1 Focus adjustment Adjustment preparation (1) The set can face in any direction: west, east, north or south. (2) Receive the cross-hatch pattern signal. CONTRAST : HALF BRIGHTNESS : MINIMUM (3) The electrical focus adjustment should have been completed. (4) The centering DY inclination should have been adjusted. Adjustment procedure (1) Loosen the fixing screw on the lens cylinder so that the lens cylinder can be turned. (Be careful not to loosen too much. If it is loosened too much, rattling when tightening becomes greater and the focus may drift). After completing steps (5), (6) and (7) below, tighten the fixing screws for each lens with a torque of 12-l 7 Kgf cm. (2) Apply covers to 2 of R, G and B lenses, and project a single color on the screen and adjust in sequence. (The adjustment order of R, G and B is only an example.) (3) For each of the R, G and B lenses, observe the color abberation generated on the outer circumference of the cross-hatch bright line at the center section +3 pitches vertically and horizontally from the center. (4) If the lens adjustment knob is turned clockwise, viewed from the front, the color aberration changes as follows.
Lens R lens G lens B lens Change of color aberration

Set Size 50"

Pitch between 3.0 cross-hatch

Ll & L2 pitches

(6) In case of R lens, set to the position where the chromatic aberration changes from red to crimson. As shown below, observe the vertical bright line at the center and set to the position where the crimson chromatic aberration slightly appears inside and red outside (reference value: l -3mm) within the cross-hatch pitches specified in next table.

RED CHROMATIC ABERRATION

SLIGHTLY CRIMSON CHROMATIC ABERRATION

Red + Crimson Blue + Red Purple + Green

(5) In case of G lens, set to the point where the chromatic aberration switches from blue to red. If the chromatic aberration appearing all over the screen is not the same, observe the vertical bright line at the center of the screen and set to the position where red chromatic aberration slightly appears inside and blue outside (reference value: 1-3mm) within the cross-hatch pitches specified in next table. When the red chromatic aberration appearing at both sides of the bright line is not equal, observe the side with larger chromatic aberration when adjusting.

(7) In case of B lens, set to the position where the chromatic aberration changes from purple to green. As shown below, observe the vertical bright line at the center and set to the position where green chromatic aberration slightly appears inside and purple outside (reference value: l-3mm) within the cross-hatch pitches specified in next table.

PURPLE CHROMATIC ABERRATION

SLIGHTLY GREEN CHROMATIC ABERRATION

RED CHROMATIC ABERRATION SLIGHTLY BLUE CHROMATIC ABERRATION OR NO COLOR

19

Notes: (1) Fixing screw
FIXING SCREW

(2) Color aberration
COLOR ABERRATION

hL

LENS ==Tlc
6 CROSS-HATCH

(5) Select the input signal for high brightness (Video level = 0.7iSVpp). (6) Adjust the high brightness white balance using the drive adjustment VRs (red, green). (7) Select the signal for low brightness (Video level = 0.145Vpp) (8) Adjust the low brightness white balance using the screen adjustment VRs (red, green, blue). (Visually adjust). (9) Check that high brightness white balance is obtained. If it does not, return to step (7). NOTE: Before adjusting the White Balance, check that the screen adjustment VRs are turned fully counterclockwise. Since the phosphorescent surface of the CRT is likely to be burned, be careful. White balance = Color coordinate = 9300" K + OMPCD x . . . . . . 0.285 Y . . . . . . 0.295

(3) Since the G light is very important for picture quality and performance, pay special attention in its adjustment. Note: Be careful not to touch the lens with your fingers when adjusting.

(4) For red, setting to the center between red and crimson is optimum. (5) For blue, setting to the center between purple and green is optimum.

2.3 Sub brightness 2.2 White balance adjustment (1) Screen adjustment (2) High brightness white balance. (3) Low brightness balance.

adjustment

Adjustment preparation (I) Start adjustment 20 minutes or more after the power is turned ON. Receive the color bar signal. (2) Set the contrast and color controls to minimum. (3) The vertical incident illumination on the screen should be 20 lux or less.

Adjustment preparation (I) Start adjustment 20 minutes or more after the power is turned on. (2) The vertical incident illumination on the screen should be 20 lux or less. (3) Set the video settings (CONTRAST: MAX, others: center) to standard condition. (4) For low brightness white balance adjustment, input a white raster signal level of 0.145 Vp-p (Video input level). (5) For high brightness white balance adjustment, input a white raster signal level of 0.715Vp-p (Video input level). (6) Set the drive adjustment VRs (red and green) to 12 - 2 o'clock position. (7) Turn the screen adjustment VRs (red, green and blue) fully counterclockwise. (8) Set video advanced setting white control to COOL position. Adjustment procedure (1) Go to VIDEO CHROMA ADJUST mode by pressing INPUT and Power button on Control Panel at the same time. (2) In "SERVICE" mode push b button and screen turns to black. Gradually turn the screen adjustment VRs (red, green, blue) clockwise and set them where the red, green and blue slightly bright lines just appear evenly on the screen. (3) Push the b button again to return to "Normal" side. (4) Press "MENU" button to exit VIDEO CHROMA ADJUST.
20

LIF,aY

CY G MG R 5 A7 IA6 1 A5 IA4 1A3 1 A2 1 Al b\\
. C

d \ Q I w 100% BLK '

Should sink to black `Should rise slightly from

black

Adjustment procedure (1) Go to "Sub Brightness" adjustment in VIDEO CHROMA ADJUST mode (press Input and Power button on Control panel at same time), using A v buttons and then b button. (2) Then adjust "Sub Brightness" using 4 b buttons to increase or decrease the value, according to figure. (Visually adjust). (3) After adjustment, press MENU button to exit VIDEO CHROMA ADJUST mode. (Data is stored in memory).

Note: When selecting SUB-BRIGHTNESS mode the microprocessor sets the CONTRAST and COLOR to MIN. automatically, but make sure that the other conditions are center. Directly observe the screen by eye without using a mirror.

2.4 Sub picture white balance (ROM4, ROM6, ROM8)

adjustment

Adjustment preparation (1) Start adjustment after power is ON for 20 minutes. (2) Use a white raster signal for adjustment. (3) Press "FREEZE" on the remote control and select "SINGLE" freeze mode to display the sub picture. (4) Set CONTRAST to Maximum, Other conditions to center. Adjustment procedure (1) Connect oscilloscope to P802 and adjust ROM8 to match blue level of main and sub pictures. (2) Repeat for P832 and ROM6 Green, P862 and ROM4 for Red.

Adjustment procedure (1) Check that the waveforms shown below are obtained (Input signal @ and a), at rear SP Terminal Out.

(a) SP MATRIX RR

mode

RL

(b) IV

EXT mode RR

K

w

-a

I VPP

RL

0

no signal

2.6 Raster Inclination

adjustment

(Deflection

Yoke)

Note:

If the sub picture has a signal sag, adjust level at center point. IV

`I

MRllcN SAG .4.._.... ....... ENlER .. .. P0lN-l 9

Adjustment preparation The set'can face east or west. (2) Input the single cross test signal. Set video conditions to factory reset. The lens focus adjustment should have been completed. The electric focus should have been coarse adjusted. (6) The digital convergence RAM should be cleared (uncorrected state). With the TV set off, press and hold the service switch located on the Power/Deflection PWB and then press the power button. (7) Start adjustment 20 minutes or more after TV is turned on.

(1) I:; (5)

2.5 SP Matrix Check Adjustment preparation (1) Input the following audio signals to the audio input of the VIDEO INPUT terminals, when checking SP Matrix:

Adjustment procedure (1) Apply covers to the R and B lenses and project only green light. (2) Turn the G deflection yoke and adjust the vertical raster inclination. (3) Then, remove the cover of R or B lens and project red or blue light and green light together on the screen.

0
@

R ch: 435mVrms L ch: no signal

.

.
l

Set the AUDIO ADVANCED SETTING for INT. SPEAKERS: ON, LOUDNESS: OFF and PERFECT VOLUME: OFF. Set the volume control of FRONT to 20 step. Set the BALANCE, TREBLE and BASS to Normal. Front waveform: the set. front speaker output of

Note:

21

(4) Turn the deflection yoke of R or B and set so that the inclination of R or B with respect to the green light is as shown below on the top and bottom sides. (5) After raster inclination adjustment, fixing screw of DY should be screwed with 12+2kg-cm torque.

h

cLII4-

t, s +2 mm

Geometric center of the screen

NOTES: (1) If internal cross-hatch does not appear after clearing RAM data, press service switch again. (2) To restore old RAM data, turn TV off and on.
CROSSHATCH (GREEN)

2.8 Vertical

size adjustment

(R630)

4, &

+2mm

Notes:

(1) If internal cross-hatch does not appear after clearing RAM data, press service switch again, on POWER/DEFLECTION PWB. (2) To restore old RAM data, turn TV off and on.

2.7 Raster position

adjustment

Adjustment preparation (1) The set can face east or west. (2) Input the single cross test signal. (3) Set video conditions to factory reset. (4) The lens focus adjustment should have been completed. (5) The electric focus should have been coarse adjusted. (6) The digital convergence RAM should be cleared (uncorrected state). With the TV set off, press and hold the service switch located on the Power/Deflection PWB and then press the power button. (7) Start adjustment 20 minutes or more after TV is turned on. Adjustment procedure (1) Turn the centering magnets for red, green, and blue to satisfy the condition below. The red and blue horizontal lines should match with green.

Adjustment preparation (1) The set can face east or west. (2) Input the single cross test signal. (3) Set video conditions to factory reset. (4) The lens focus adjustment should have been completed. (5) The electric focus should have been coarse adjusted. (6) The digital convergence RAM should be cleared (uncorrected state) With the TV set off, press and hold the service switch located on the POWER/DEFLECTION PWB and then press the power button. (7) Start adjustment 20 minutes or more after TV is turned on. Adjustment procedure (1) Turn only the green by applying covers to the red and blue lens or shorting the 2 pin TS connectors on the red and blue CPT P.W.B. (2) Count the vertical lines of the DCU cross hatch. If the number of vertical lines is 9, go to step (3). If the number of vertical lines is 8, push "HELP" key and then "5" key on the R/C so the number of vertical lines becomes "9". (3) Turn vertical amplitude adjustment VR (R630) so that the distance between the top and bottom horizontal lines is equal to the size shown in the table.

Note:

(1) If internal cross-hatch does not appear after clearing RAM data, press service switch again (on POWER/DEFLECTION PWB). (2) To restore old RAM data, turn TV off and on.

22

(5) Short-circuit all metal parts (metal fittings, centering magnet) installed on the projection tubes to GND's of the projection tubes. Since metal parts are charaed with electricitv, shocks may be caused if they are not short circuited. 2.9 Horizontal size adjustment (R603) Adjustment procedure (1) Green (G) tube beam alignment adjustment. Short-circuit 2P subminiature connector plug pins of Red (R) and Blue (B) on the CPT boards and project only Green (G) tube. (2) Put Green (G) tube beam alignment magnet to the cancel state as shown below. Adjustment preparation (I) The set can face east or west. (2) Input the single cross test signal. (3) Set video conditions to factory reset. (4) The lens focus adjustment should have been completed. (5) The electric focus should have been coarse adjusted. (6) The digital convergence RAM should be cleared (uncorrected state). With the TV set off, press and hold the service switch located on the POWER/DEFLECTION PWB and then press the power button. (7) Start adjustment 20 minutes or more after TV is turned on. Adjustment procedure (1) Project only green, the same as Vertical size adjustment. (2) Turn horizontal amplitude adjustment VR (R603) so distance between the left and right vertical lines is equal to the size shown in the table.

! +
i
l ( i! m

(3) Turn the Green (G) static focus (Focus Pack) counterclockwise all the way and make sure of position of cross-hatch center on screen. (Halo state.) (4) Turn the Green (G) static focus (Focus Pack) ctockwise all the way. (Blooming state.) (5) Turn two magnets forming alignment magnet in any desired direction and move cross-hatch center to position found in (3). (6) If image position does not shift when Green (G) static focus (Focus Pack) is turned. Green (G) beam alignment has been completed. (7) If image position shifts when Green (G) static focus (Focus Pack) is turned, repeat (2)-(6). (8) Conduct beam alignment for red (R) focus: Focus Pack UFPK, Blue (B) focus: Focus Pack UFPK. (9) Upon completion of adjustment, fix beam alignment magnets with white paint. 2.11 Beam shape adjustment Adjustment preparation (1) The beam alignment should have been completed. (2) The raster inclination, centering, horizontal/ vertical amplitude and optical focus adjustments should have been completed. (3) Set video conditions to factory reset. (4) Input the dot signal. Adjustment procedure PRT beam shape adjustment. Shortcircuit 2P sub-mini connectors on Red and Blue CPT PW.B.s to project only the Green beam. (2) Turn the green static focus fully clockwise. (Blooming.) (3) Make the dot at the screen center a true circle using the 4-pole magnet as shown below. Also adjust the Red and Blue PRT beam shapes (4) according to the steps (I) to (3). (5) After the adjustment has been completed, return R, G and B static VRs to the just focus point.

Note:

(1) If internal cross-hatch does not appear after clearing RAM data, press service switch again. (2) To restore old RAM data, turn TV off and on.

2.10 Beam alignment Adjustment preparation (1) Adjust at least 30 minutes after switch. (21 Raster inclination, centering, vertical amplitudes and optical should be completed. (3) Set video conditions to factory (4 Receive cross-hatch signals. cross-hatch signals allowed.) turning on power horizontal and focus adjustment reset. (Use of internal

(1) Green

23

PRT SURFACE

SIDE

`ION

ZERO FIELD SPACER IN0 ADJUSTMENT) TRUE CIRCLE SPECIFICATION

ALIGNMENT MAGNET

(3) Turn the B Focus VR (Focus Pack) fully clockwise. (4) Measure the brightness at the center of the screen and turn the B FOCUS VR (Focus Pack) counterclockwise to adjust the brightness of blue as shown in Table. (5) After the adjustment is completed, if blue exceeds the specification, turn and adjust focus so that the sticking out part of blue satisfies the specification.

TRUE CIRCLE DEGREE: a/b SPECIFICATION: 0.9-l .l

~rw'~Y-4~~~~~~~

2.12 Static focus adjustment Adjustment preparation (1) The raster. inclination, centering, horizontal/ vertical amplitude and optical/electrical focus beam alignment should have been adjusted. (2) The static convergence data should be cleared. (3) Set video conditions to factory reset. (4) Receive the cross-hatch pattern signal. (5) Apply covers to the lenses of colors other than the color to be adjusted and project a single color. Adjustment procedure (1) Red (Rj, Green (G) and Blue (B) static focus adjustment. Vary the static focus VR (focus pack UFPK) and make the center of the cross-hatch pattern clearest. (2) Observe the corners of the picture and check that the focus does not get conspicuously worse.
OBSERVING CORNER POINTS OF THE OF THE PICTURE

6-l IF/
Defocus stickina

OUT

OF BLUE

out specification

I Screen Size
I
Condition:
50"

1 Blue sticking out 1 I 1 .Omm I

User controls are set to the initial set positions (for shipment) Measuring point Screen center. Correct the brightness gauge and amplitude of the all-white signal periodically. The aperture angle of the brightness gauge is 1". Use a cross-hatch pattern to check.

Cautions:

2.14 Digital

convergence

adjustment

Adjustment preparation Receive an RF or video signal. Set controls to factory preset. Install jig screen on the set. Note the center of the video pattern displayed. This is necessary to match dotted lines (adjustment point viewed) and actual point that is adjusted and displayed by the video signal.

OBSERVING POINTS 2.13 Blue defocus adjustment Adjustment Preparation (1) Optical and electrical focus adjustment should have been completed. (2) The convergence adjustment should have been completed. (3) Set Video conditions to factory reset. Adjustment procedure (I) Input an all-white signal shown below to VIDEO input. (2) Short-circuit 2P sub-mini connectors on the red and green CPT P.W.Bs. to display only the blue

(5) Press (6)

switch the service only (on POWER/DEFLECTION PWB). The pattern displayed is now the digital convergence mode. digital performing a complete When convergence adjustment CLEAR DATA in RAM. See 2.6. (1) - (7).

(2) Identify
(3) (4) (5) (6)

(7)

the bent lines and use the cursor buttons to move the dotted lines in between as shown. Press HELP to exit PHASE mode. Press EXIT 5 times to display external signal. Identify center of active video, then press EXIT 5 times to return to internal cross-hatch. Press HELP (phase adj.), and use 2,4, 5 and 6 to position internal cross-hatch center on active video center identified in step (5). Press HELP to exit PHASE mode.

Adjustment Point

ACTIVE VIDEO CENTER FROM STEP (5)

USE CURSOR KEYS TO MOVE DOTTED LINES BETWEEN BENT LINES FIRST

JIG SCREEN SPECIFICATION
GEOMETRIC 84.9 THEN USE NUMBER KEYS TO MATCH INTERNAL CROSSHATCH CENTER TO ACTIVE VIDEO CENTER CENTER OF THE SCREEN

AFTER

t; i5 6
Note:

2.14.2 Raster position
MODEL: 50" UNIT mm

adjustment

If only minor adjustments to convergence are needed, the jig screen is not necessary. Use digital data stored in memory and one color as a reference (red, green, or blue). 00 NOT CLEAR DATA and WRITE to ROM memory.

Adjustment preparation (1) Position adjustment - This will move an entire color. Use this adjustment to match colors at the center of the screen. {Active video center from external signal and physical screen center should now match from phase adj. 2.15.1.). (2) Use the buttons below to switch color to adjust. "RECALL' - Green "0" - Red "INPUT" - Blue Adjustment procedure (1) Press the FRZ button. Extra horizontal lines appear to confirm raster position mode. (2) Use the cursor buttons to adjust position. (3) Press FRZ again to exit raster position mode. Notes: (1) Other functions cannot be accessed when in raster position adjustment mode. Press FRZ and confirm extra horizontal lines disappear to exit raster position mode. (2) Press MENU to switch between all colors displayed or adjustment color and Green only.
25

2.14.1 Phase adjustment

(service

mode)

Adjustment preparation (1) PHASE adjustment - This is to match the digital convergence cursor position to the video image displayed, and to match the digital convergence cursor position (dotted lines) to digital convergence data position (bent lines). Adjustment procedure (1) Press the HELP button on the remote to select phase adjustment. (Only Green displayed).

2.14.3 Convergence

point adjustment

Adjustment preparation (1) Select color to adjust. "RECALC' - Green "0" - Red "INPUT" - Blue (2) Use 4, 6, 2, and 5 to move the cursor position (dotted lines). (3) Use cursor buttons to move the convergence point. (4) Three adjustment modes are available: 1. (3x3) Press "RECALL" 5 times 2. (7x5) Press "0" 5 times 3. (13x9) Press "INPUT" 5 times NOTE: 3 x 3 mode can only be accessed at start of adjustment from clear data in ram adj. mode.

(5) Existing DATA in ROM can be read by pressing the SWAP button 2 times. This data can be used after replacing a component (CRT, DY, etc.) Where complete convergence adjustment is not necessary be careful not to overwrite this data. DO NOT write cleared RAM data into ROM or a complete convergence adjustment will be necessary.

2.14.4 Digital Convergence

Remote

Control

For touch-up, only the (13x9) mode is necessary. This will adjust every cross-hatch intersection point on the screen. For complete adjustment, start with (3x3) mode. This will adjust center point and eight edge points only, but will greatly reduce adjustment time. Then use (7x5) mode, and finally (13x9) mode to finish convergence. If "S" distortion appears between cross-hatch lines repeat (7x5) mode to change calculation process while adjusting to remove distortion, then return to (13x9) mode to finish touch-up convergence. Adjustment procedure (1) Start adjustment at the center of the screen. (2) Continue adjustment at next closest position. (3) Adjust center area first, ending with edge sections. (4) When convergence is acceptable, press MOVE to write data to ROM memory. ROM WRITE? is displayed to alarm system that ROM will be overwritten with new data. Press the MOVE button again to write displayed data to ROM. (5) DATA WRITE TO ROM will take approximately 20 seconds and no picture will be displayed. (6) Green dots will be displayed when operation is complete. (7) Press MUTE to return to convergence pattern, then confirm again convergence is acceptable. Notes: (1) Display only green for easier adjustment and match to jig screen. Press "MENU", THEN PRESS "RECALL'. (2) Write data to ROM after green adjustment. Once green has been confirmed to match jig screen, the jig screen can be removed. Do not readjust the green color after jig screen has been removed. This is now your reference color. (3) Display green and red only and match red to green. (4) Display all colors and match blue to green and red. Touch-up red color if necessary.

Cl
POWER

HELP

PIPCH

PhasePIP SWAP MOVE FRZ

Raster Position ROM Read ROM Write

LST-CH

0
MUTE

-Video Remove Color Green (3 X 3 Adj.)
EXIT

Crosshatch/ Mode

-Adjustment

CURSOR

CONTROL

-Cursor

Up

Cursor Cursor

Left Down -

-Cursor

Right

Blue (13 X 9 Adj.) -(7 XRs"dAdj.)

HWACHI
CLU-435UI

26

3. ADJUSTMENT POINT 3.1 CRT, cabinet locations

FRONT OF TV

I. CENTERING MAGNET FOR RED PRT 2.CENTERtNG MAGNET FOR GREEN PRT 3.CENTERlNG MAGNET FOR BLUE PRT 4.4-POLE MAGNET FOR BEAM FORM ADJUSTMENT 5. BEAM ALIGNMENT MAGNET 6. DIGITAL CONVERGENCE MODULE (On Power/Deflection Board) 7. FOCUS PACK (Top Adjustments for SCREEN, Bottom for FOCUS)

27

3.2 MAN CHASSIS (Signal P.W.B.)

240

0u
IO01 1102 SP MatrixP.W.B. SIGNALSUB P.W.B. PIP
TUNER VJTH MT!3 (MAIN `ICTURE' .PlP TUNER

ROM8 ROM6 ROM4 (Blue) (Green)(Red)

VM P.W.E

/

u102

Rear View 20

3.3 MAIN CHASSIS (Power/Deflection

P.W.B.)

305 3*+------

SKOl: SERVtCE ONLY button (COW. ADJ) I

0 I -325

II

PSDI

q q
0946 TV 9v

D939 TV 5v

l601 `r

q
[xl

D967 -23V El D940 +B 120V

E D966 +2N

I

I

PSD4

@ El (1 0912 PROTECT (RED) Y2 III 0

I
I PSD5

E3l

cl947 AUDIO 27V

a
CB a SERVICE LED.

Rear View

29

3.3 CPT (R) (G) (B), Focus

Pack, Control

P.W.B.

CPT (B)
GND

CPT (G)
GND GREEN DRIVE

CPT (R)
GND

Focus Pack (UFPK)

---

Screen Adj. VR

//--Focus

Adj. VR

Control P.W.B.

MENU

INPUT/EXIT

VOL (+)

(3-l (+I

DIMMER CONTROL LIGHT RECEIVER

ARRAY

30

TROUBLESHOOTING 1, No Raster and No Power (REPAIR METH