Symphonic SRT2232S Schematic

SERVICE MANUAL

32" COLOR TELEVISION

SRT2232S

IMPORTANT SAFETY NOTICE

Proper service and repair is important to the safe, reliable operation of all Funai Equipment. The service procedures recommended by Funai and described in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended.

It is important to note that this service manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Funai could not possibly know, evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, Funai has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Funai must first use all precautions thoroughly so that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

TABLE OF CONTENTS

Specifications ........................................................ 1-1

Important Safety Precautions................................ 2-1

Standard Notes for Servicing ................................ 3-1

Disassembly Instructions ...................................... 4-1

Electrical Adjustment Instructions ......................... 5-1

Block Diagram....................................................... 6-1

Schematic Diagram / CBA's and Test Points ....... 7-1

Schematic Diagram .............................................. 7-3

CBA Views and Test Points.................................. 7-15

Wave Forms .......................................................... 8-1

Wiring Diagram...................................................... 9-1

IC Pin Function .................................................... 10-1

Cabinet Exploded View ....................................... 11-1

Packing Exploded View ....................................... 11-3

Mechanical Parts List .......................................... 12-1

Electrical Parts List.............................................. 13-1

SPECIFICATIONS

<TUNER>

Description Condition Unit Nominal Limit

1. Intermediate Freq. Picture

2. Peak Picture Sens VHF

3. AFT Pull In Range (10mV input)

ANT. Input ------------------ 75ohm Unbal., F type Reference Level ----------- 20Vp-p (CRT Green Cathode)

Test Input Signal ---------- 400Hz 30% modulation

Sound

CATV

UHF

Description Condition Unit Nominal Limit

1. Deflection Freq. Horizontal Vertical

2. Linearity Horizontal Vertical

3. Over Scan

4. High Voltage

MHz MHz

dBµV dBµV dBµV

MHz ±2.2 ±0.7

KHz

% %

%10

KV 29

45.75

41.25

15 15 15

15.734 60

30 30 40

±15 ±10

Description Condition Unit Nominal Limit

1. Misconvergence Center Side

Corner

2. Brightness APL 100% Ft-L 30 15

3. Color Temperature

4. Resolution Horizontal

<AUDIO>

Description Condition Unit Nominal Limit

1. Audio Output Power 10% THD W 3 2.4

2. Audio Distortion (w/LPF) 500mW % 2 7

3. Audio Freq. Response -3dB Hz 90~11K

Note:

Nominal specifications represent the design specifications. All units should be able to approximate these. Some will exceed and some may drop slightly below these specifications. Limit specifications represent the absolute worst condition that still might be considered acceptable. In no case should a unit fail to meet limit specifications.

All items are measured across 8Ω load at speaker output terminal.

Vertical

mm mm mm

°K 9200°K

Line Line

250 300

0.4

1.5

2.1

1-1 L6250SP

IMPORTANT SAFETY PRECAUTIONS

Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Safety Precautions for TV Circuit

1. Before returning an instrument to the custom-

always make a safety check of the entire instru-

er,

ment, including, but not limited to, the following items:

Be sure that no built-in protective devices are de-

fective and have been defeated 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 fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks.

ate 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 the cabinet mask, (2) excessively wide cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly secured cabinet back cover.

c. Antenna Cold Check -

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 megohm or greater than 5.2 megohm, 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 -

ment completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leak-

With the instrument AC

Do not oper-

With the instru-

age current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 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 water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, 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 milli-ampere. Reverse the instrument power cord plug in the outlet and repeat the test.

READING SHOULD NOT BE ABOVE 0.5 mA

LEAKAGE

DEVICE

BEING

TESTED

TEST ALL EXPOSED

METAL SURFACES

ALSO TEST WITH PLUG REVERSED USING AC ADAPTER PLUG AS REQUIRED

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. X-Radiation and High Voltage Limits -

the picture tube is the primary potential source of X-radiation in solid-state TV receivers, it is specially constructed to prohibit X-radiation emissions. For continued X-radiation protection, the replacement picture tube must be the same type as the original. Also, because the picture tube shields and mounting hardware perform an X-radiation protection function, they must be correctly in place. High voltage must be measured each time servic-

CURRENT

TESTER

EARTH GROUND

Because

2-1 L6115IMP

ing is performed that involves B+, horizontal deflection or high voltage. Correct operation of the Xradiation protection circuits also must be reconfirmed each time they are serviced. (X-radiation protection circuits also may be called "horizontal disable" or "hold down.") Read and apply the high voltage limits and, if the chassis is so equipped, the X-radiation protection circuit specifications given on instrument labels and in the Product Safety & X-Radiation Warning note on the service data chassis schematic. High voltage is maintained within specified limits by close tolerance safety-related components/adjustments in the high-voltage circuit. If high voltage exceeds specified limits, check each component specified on the chassis schematic and take corrective action.

2.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.

3. Design Alteration Warning -

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 connections, might alter the safety characteristics of this receiver and create a hazard to the user. Any design alterations or additions will void the manufacturer's warranty and may make you, the servicer, responsible for personal injury or property damage resulting therefrom.

4. 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. Some "in-line" picture tubes are equipped with a permanently attached deflection yoke; because of potential hazard, do not try to remove such "permanently attached" yokes from the picture tube.

5. Hot Chassis Warning -

a.Some TV receiver chassis are electrically connect-

ed directly to one conductor of the AC power cord and maybe safety-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. To confirm that the AC power plug is inserted correctly, with an AC voltmeter, measure between the chassis and a known

Do not alter or add

earth ground. If a voltage reading in excess of 1.0V 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.

Some TV receiver chassis normally have 85V

AC(RMS) between chassis and earth ground regardless of the AC plug polarity. This chassis can be safety-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.

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 insulation material that must not be defeated or altered.

Observe original lead dress. Take extra care to as-

sure 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 place, or frayed wiring. Check AC power cord for damage.

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.

8. Product Safety Notice -

chanical parts have special safety-related characteristics 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 by a ( # ) on schematics and in parts lists. Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire, and/or other hazards. The product's safety is under review continuously and new instructions are issued whenever appropriate. Prior to shipment from the factory, our products are strictly inspected to confirm they comply with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Some electrical and me-

2-2 L6115IMP

Precautions during Servicing

A.Parts identified by the ( # ) symbol are critical for

safety. Replace only with part number specified.

B.In addition to safety, other parts and assemblies

are specified for conformance with regulations applying to spurious radiation. These must also be replaced only with specified replacements.

Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.

C.Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

D.Use specified insulating materials for hazardous

live parts. Note especially:

1) Insulation Tape

2) PVC tubing

3) Spacers

4) Insulators for transistors.

E.When replacing AC primary side components

(transformers, power cord, etc.), wrap ends of wires securely about the terminals before soldering.

F.Observe that the wires do not contact heat produc-

ing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.)

G.Check that replaced wires do not contact sharp

edged or pointed parts.

H.When a power cord has been replaced, check that

5~6 kg of force in any direction will not loosen it.

I.Also check areas surrounding repaired locations.

J.Use care that foreign objects (screws, solder drop-

lets, etc.) do not remain inside the set.

K.Crimp type wire connector

The power transformer uses crimp type connectors which connect the power cord and the primary side of the transformer. When replacing the transformer, follow these steps carefully and precisely to prevent shock hazards. Replacement procedure

1) Remove the old connector by cutting the wires at a point close to the connector. Important: Do not re-use a connector (discard it).

2) Strip about 15 mm of the insulation from the ends of the wires. If the wires are stranded, twist the strands to avoid frayed conductors.

3) Align the lengths of the wires to be connected. Insert the wires fully into the connector.

4) Use the crimping tool to crimp the metal sleeve at the center position. Be sure to crimp fully to the complete closure of the tool.

L.When connecting or disconnecting the internal

connectors, first, disconnect the AC plug from the AC supply outlet.

2-3 L6115IMP

Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

1. Clearance Distance

When replacing primary circuit components, confirm specified clearance distance (d) and (d') between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)

Table 1 : Ratings for selected area

AC Line Voltage Region

110 to 130 V

This table is unofficial and for reference only.

Note:

Be sure to confirm the precise values.

USA or

CANADA

Clearance

Distance (d) (d')

≥ 3.2 mm

(0.126 inches)

2. Leakage Current Test

Confirm the specified (or lower) leakage current between B (earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is lower than or equal to the specified value in the table below.

Measuring Method : (Power ON)

Insert load Z between B (earth ground, power cord plug prongs) and exposed accessible parts. Use an AC voltmeter to measure across both terminals of load Z. See Fig. 2 and following table.

1.5kΩ

Chassis or Secondary Conductor

Primary Circuit Terminals

dd'

Exposed Accessible Part

AC Voltmeter

0.15µF

Earth Ground

Power Cord Plug Prongs

(High Impedance)

Fig. 1

Fig. 2

Table 2 : Leakage current ratings for selected areas

AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:

0.15µF CAP. & 1.5kΩ

110 to 130 V USA

This table is unofficial and for reference only. Be sure to confirm the precise values.

Note:

RES. connected in

parallel

2-4 L6115IMP

i≤0.5mA rms

Exposed accessible

parts

STANDARD NOTES FOR SERVICING

Circuit Board Indications

a. The output pin of the 3 pin Regulator ICs is indicat-

ed as shown.

Top View

Out

b. For other ICs, pin 1 and every fifth pin are indicat-

ed as shown.

Pin 1

c. The 1st pin of every male connector is indicated as

shown.

Pin 1

Input

Bottom View

(2) Remove the flat pack-IC with tweezers while ap-

plying the hot air.

(3) Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

(4) Release the flat pack-IC from the CBA using twee-

zers. (Fig. S-1-6)

Caution:

1. Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)

2. The flat pack-IC on the CBA is affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it.

Hot-air Flat Pack-IC Desoldering Machine

CBA

How to Remove / Install Flat Pack-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:

(1) Prepare the hot-air flat pack-IC desoldering ma-

chine, then apply hot air to the Flat Pack-IC (about 5 to 6 seconds). (Fig. S-1-1)

Fig. S-1-1

Masking Tape

Tweezers

Flat Pack-IC

Fig. S-1-2

3-1 L6115STA

With Soldering Iron:

(1) Using desoldering braid, remove the solder from

all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

(2) Lift each lead of the flat pack-IC upward one by

one, using a sharp pin or wire to which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine.(Fig. S-1-4)

soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

(5) Release the flat pack-IC from the CBA using twee-

zers. (Fig. S-1-6)

Note:

When using a soldering iron, care must be taken to ensure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied.

Hot Air Blower

Iron Wire

Soldering Iron

To Solid Mounting Point

Fig. S-1-5

Sharp Pin

Fine Tip Soldering Iron

Fig. S-1-4

(3) Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

(4) Release the flat pack-IC from the CBA using twee-

zers. (Fig. S-1-6)

With Iron Wire:

(1) Using desoldering braid, remove the solder from

all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

(2) Affix the wire to a workbench or solid mounting

point, as shown in Fig. S-1-5.

(3) While heating the pins using a fine tip soldering

iron or hot air blower, pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig. S-1-5.

(4) Bottom of the flat pack-IC is fixed with glue to the

CBA; when removing entire flat pack-IC, first apply

CBA

Tweezers

Fine Tip Soldering Iron

Flat Pack-IC

Fig. S-1-6

3-2 L6115STA

2. Installation

(1) Using desoldering braid, remove the solder from

the foil of each pin of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily.

(2) The "I" mark on the flat pack-IC indicates pin 1.

(See Fig. S-1-7.) Be sure this mark matches the 1 on the PCB when positioning for installation. Then pre- solder the four corners of the flat pack-IC. (See Fig. S-1-8.)

(3) Solder all pins of the flat pack-IC. Be sure that

none of the pins have solder bridges.

Example :

Pin 1 of the Flat Pack-IC is indicated by a " " mark.

Fig. S-1-7

Instructions for Handling Semiconductors

Electrostatic breakdown of the semiconductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a grounding band (1MΩ) that is properly grounded to remove any static electricity that may be charged on the body.

2. Ground for Workbench

Be sure to place a conductive sheet or copper plate with proper grounding (1MΩ) on the workbench or other surface, where the semiconductors are to be placed. Because the static electricity charge on clothing will not escape through the body grounding band, be careful to avoid contacting semiconductors with your clothing.

CBA

Presolder

Flat Pack-IC

Fig. S-1-8

1MΩ

CBA

Grounding Band

1MΩ

CBA

Conductive Sheet or Copper Plate

3-3 L6115STA

CABINET DISASSEMBLY INSTRUCTIONS

1. Disassembly Flowchart

This flowchart indicates the disassembly steps for the cabinet parts, and the CBA in order to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route and dress the cables as they were.

Caution !

When removing the CRT, be sure to discharge the Anode Lead of the CRT with the CRT Ground Wire before removing the Anode Cap.

[1] Rear Cabinet

[2] CRT CBA

[3] Main CBA

[4] CRT

Note:

(1) Order of steps in procedure. When reassembling,

follow the steps in reverse order.These numbers are also used as the Identification (location) No. of parts in figures.

(2) Parts to be removed or installed.

(3) Fig. No. showing procedure of part location

(4) Identification of part to be removed, unhooked, un-

locked, released, unplugged, unclamped, or desoldered.

S=Screw, P=Spring, L=Locking Tab, CN=Connector, *=Unhook, Unlock, Release, Unplug, or Desolder

2(S-2) = two Screws (S-2)

(5) Refer to the following "Reference Notes in the

Table."

Reference Notes in the Table

1. Removal of the Rear Cabinet. Remove screws 7(S-1), 1(S-2) and 3(S-4) then slide the Rear Cabinet backward.

2. Removal of the CRT CBA. Disconnect CN1501 then pull the CRT CBA backward.

2. Disassembly Method

Removal

Step/

Loc. No.

[1]

[2] CRT CBA 4,5 CN1501 2

[3] Main CBA 3,5

[4] CRT 4 4(S-3) 4

Part

Rear Cabinet

Fig.

1,2

↓↓↓↓↓

(1) (2) (3) (4) (5)

Remove/*unlock/

release/unplug/

unclamp/desolder

7(S-1), 1(S-2), 3(S-4)

CN571, CN801, CN802, CN691, Anode Cap

Note

Caution !

Discharge the Anode Lead of the CRT with the CRT Ground Wire before removing the Anode Cap.

3. Removal of the Main CBA. First, disconnect CN571, CN801, CN802, and CN691 on the Main CBA. Second, remove Anode Cap. then slide the Main CBA backward.

4. Removal of the CRT. Remove screws 4(S-3) then slide the CRT backward.

4-1 L6250DC

S-1

S-2

S-4

S-1

[1] Rear Cabinet

S-1

Fig. 1

S-1

S-3

[3] Main CBA

Fig. 3

Anode Cap

S-1

[1] Rear Cabinet

S-4

S-1

Fig. 2

S-2

S-3

S-1

[4] CRT

4-2 L6250DC

S-3

Fig. 4

TV Cable Wiring Diagram

SP802

SP801

DG691 DEGAUSSING COIL

MAIN CBA

CN691

FLYBACK TRANSFORMER

T571

CLN802

CLN801

CN801

CN802

WH301A

TU1 TUNER

AC601 AC CORD

CN571

FOCUS

SCREEN

ANODE

WH501A

JK1501

CN1501

TO CRT GROUND

WH301B

WH501B

Fig. 5

4-3 L6250DC

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note: "CBA" is abbreviation for "Circuit Board Assembly".

NOTE:

Electrical adjustments are required after replacing circuit components and certain mechanical parts. It is important to perform these adjustments only after all repairs and replacements have been completed. Also, do not attempt these adjustments unless the proper equipment is available.

Test Equipment Required

1. NTSC Pattern Generator (Color Bar W/White Window, Red Color, Dot Pattern, Gray Scale, Monoscope, Multi-Burst)

2. DC Voltmeter

3. Oscilloscope: Dual-trace with 10:1 probe, V-Range:0.001~50V/Div, F-Range: DC~AC-60MHz

4. Plastic Tip Driver

5. Remote control unit: Part No. N0121UD or N0134UD

6. DC power supply 13.2V/5A

How to set up the service mode:

Service mode:

1. Use the service remote control unit.

2. Turn the power on. (Use main power on the TV unit.)

3. Press " SLEEP " button on the service remote control unit. Version of micro computer will display on the CRT. (Ex: 5Z38-919)

4. Check the display on the lower left is "AE" and if it is not "AE", set it at "AE" according to "3-1 LANGUAGE, STEREO TYPE, ACCESS CODE, STABLE SOUND, COMB FILTER, COMPONENT, AV MEMORY".

1. +B Adjustment

Purpose:

Symptom of Misadjustment:

the unit does not operate correctly.

Test Point Adj. Point Mode Input

TP601(+B)

TP300(GND)

To obtain correct operation.

The picture is dark and

VR661 --- ---

Tape M. EQ. Spec.

2-1. Setting for 7F, CHROMA, LAN-

GUAGE, STEREO TYPE, ACCESS CODE, STABLE SOUND, COMB FILTER, COMPONENT and AV MEMORY data Values

General

1. Enter the Service mode. (See page 5-1)

2. Press " VOL p " button on the Service remote con-

trol unit. Display changes " C/D ", " 7F ", " CHROMA ", " LANGUAGE ", " STEREO TYPE ", " ACCESS CODE ", " STABLE SOUND ", " COMB FILTER ", " COMPONENT " and " AV MEMORY " cyclically when " VOL p " button is pressed.

Press " CH o / p " buttons on the Service remote control unit. Then choose " FF ".

CHROMA

Press " CH o / p " buttons on the Service remote control unit. Then choose " AUTO ".

LANGUAGE

Press " CH o / p " buttons on the Service remote control unit. Then choose " SPA ".

STEREO TYPE

Press " CH o / p " buttons on the Service remote control unit. Then choose " MTS ".

ACCESS CODE

Press " CH o / p " buttons on the Service remote control unit. Then choose " ON ".

STABLE SOUND

Press " CH o / p " buttons on the Service remote control unit. Then choose " OFF ".

COMB FILTER

Press " CH o / p " buttons on the Service remote control unit. Then choose " ON ".

COMPONENT

Press " CH o / p " buttons on the Service remote control unit. Then choose " OFF ".

AV MEMORY

Press " CH o / p " buttons on the Service remote control unit. Then choose " ON ".

--- DC Voltmeter +138±0.5V DC.

TP601, TP300(GND), VR661 --- Main CBA

Note:

1. Connect DC Volt Meter to TP601 and TP300(GND).

2. Adjust VR661 so that the voltage of TP601 becomes +138±0.5V DC.

Note: C/D

5-1 L6250EA

data values do not need to be adjusted at

this moment.

2-2. Setting for CONTRAST,

COLOR, TINT, V-TINT, S-TINT and SHARPNESS data Values

General

1. Enter the Service mode. (See page 5-1)

2. Press " MENU " button on the Service remote control unit. Display changes " BRT ", " CNT ", " CLR ", " TNT ", " V-TINT ", " S-TINT " and " SHARPNESS " cyclically when " MENU " button is pressed.

CNT

1. Press " MENU " button on the Service remote control unit. Then select " CONTRAST " (CNT) display.

2. Press " CH o / p " buttons on the Service remote control unit so that the value of " CONTRAST " (CNT) becomes 78.

CLR

1. Press " MENU " button on the Service remote control unit. Then select " COLOR " (CLR) display.

2. Press " CH o / p " buttons on the Service remote control unit so that the value of " COLOR " (CLR) becomes 60.

3. AFT Adjustment

Purpose: Symptom of Misadjustment:

correctly and/or synchronization is faulty.

Test Point Adj. Point Mode Input

To operate AFT correctly.

VCO does not work

TP303

(AFT)

TP300

(GND)

Tape M. EQ. Spec.

--- --- ---

L33 ---

Figure

USA 4ch

80dBµ

Color

Bar

TNT

1. Press " MENU " button on the Service remote control unit. Then select " TINT " (TNT) display.

2. Press " CH o / p " buttons on the Service remote control unit so that the value of " TINT " (TNT) becomes 68.

V-TNT

1. Press " MENU " button on the Service remote control unit. Then select " V-TINT " (V-TNT) display.

2. Press " CH o / p " buttons on the Service remote control unit so that the value of " V-TINT " (V-TNT) becomes 68.

S-TNT

1. Press " MENU " button on the Service remote control unit. Then select " S-TINT " (S-TNT) display.

2. Press " CH o / p " buttons on the Service remote control unit so that the value of " S-TINT " (S-TNT) becomes 62.

SHARPNESS

1. Press " MENU " button on the Service remote control unit. Then select " SHR " (SHARPNESS) display.

2. Press " CH o / p " buttons on the Service remote control unit and select " 18 ".

Note: BRIGHT

ed at this moment.

data value does not need to be adjust-

Fig. 1

Use service remote control unit.

Note:

1. Enter the Service mode. (See Page 5-1)

2. Put the core(L33) at the same level of the case.

3. Make the core down till the adjustment point (See Fig. 1).

5-2 L6250EA

4. AGC Adjustment

Purpose:

Symptom of Misadjustment:

chronize correctly when RF input level is too weak and picture distortion may occur if it is too strong.

Test Point Adj. Point Mode Input

Notes:

1. Enter the Service mode. (See Page 5-1) Then

2. Receive the Color Bar signal for channel 4

3. Press " CH o / p " buttons so that the voltage of

4. Turn the Power off and on again. (Main power but-

Set AGC (Auto Gain Control) Level.

AGC does not syn-

TP301 (AGC) TP300 (GND)

Tape M. EQ. Spec.

---

TP300, TP301 --- Main CBA

Use Service remote control unit.

press number " 2 " button on the Service remote control unit and select TV AGC.

(67.25MHz). (RF Input Level: 60dBµV)

TP301 becomes +2.5±0.1V DC. If the tuner is used TEDH9-300A. (Tuner type number)

ton on the TV unit.)

CH o / p

buttons

Pattern

Generator DC

Volt Meter

Color Bar

67.25MHz 60dBµV

+2.5±0.1VDC

5. V. Size Adjustment

Purpose: Symptom of Misadjustment:

cal size of image on the screen may not be properly displayed.

Test Point Adj. Point Mode Input

Note:

1. Operate the unit for at least 20 minutes.

2. Enter the Service mode. (See page 5-1)

3. Receive the Monoscope Pattern.

4. Press " 9 " button on the Service remote control unit

5. Press " CH o / p " buttons on the Service remote

To obtain correct vertical width of screen image.

If V. Size is incorrect, verti-

Screen Control

---

Tape M. EQ. Spec.

--- Monoscope 90±5%

Use service remote control unit.

and select " V-S " mode. (Display changes " V-S ", " V-P ", " V-LI " and " V-SC " cyclically when " 9 " button is pressed).

control unit so that the monoscope pattern will be 90±5% of display size and the circle is round.

CH o / p

buttons [ V-S ]

Mode

Mono-

scope

6. Turn the power off and on again. (Main power button on the TV unit.)

6. V. Position Adjustment

Purpose:

image.

Symptom of misadjustment:

rect, vertical height of image on the screen may not be properly displayed.

Test Point Adj. Point Mode Input

Note:

1. Operate the unit for at least 20 minutes.

2. Enter the Service Mode. (See page 5-1)

3. Receive the Monoscope Pattern.

4. Press " 9 " button on the Service remote control unit

5. Press " CH o / p " buttons on the Service remote

6. Turn the Power off and on again. (Main power but-

To obtain correct vertical width of screen

If V. Position is incor-

Screen Control

---

Tape M. EQ. Spec.

--- Monoscope 90±5%

Use Service remote control unit

and select " V-P "mode. (Display change " V-S ", " V-P ", " V-LI " and " V-SC " cyclically when " 9 " button is pressed).

control unit so that the top and bottom of the monoscope pattern will be equal of each other.

ton on the TV unit.)

CH o / p

buttons [ V-P ]

Mode

Mono-

scope

7. H. Position Adjustment

Purpose:

screen image.

Symptom of Misadjustment:

rect, horizontal position of image on the screen may not be properly displayed.

Test Point Adj. Point Mode Input

Note:

1. Operate the unit for at least 20 minutes.

2. Enter the Service mode. (See page 5-1)

3. Receive the Monoscope Pattern.

4. Press " 8 " button on the remote control unit and

To obtain correct horizontal position of

If H. Position is incor-

Screen Control

---

Tape M. EQ. Spec.

--- Monoscope 90±5%

Use Service remote control unit

select " H-P "mode.

CH o / p

buttons [ H-P ]

Mode

Mono-

scope

5-3 L6250EA

5. Press " CH o / p " buttons on the Service remote

control unit so that the monoscope pattern will be 90±5% of display size and the circle is round.

6. Turn the Power off and on again. (Main power button on the TV unit.)

8. V-LINIARITY and S CORRECTION

Adjustment

Purpose:

screen image.

Symptom of Misadjustment:

rect, horizontal position of image on the screen may not be properly displayed.

Test Point Adj. Point Mode Input

Note:

1. Operate the unit for at least 20 minutes.

2. Enter the Service mode. (See page 5-1)

3. Receive the Monoscope Pattern.

4. Press " 9 " button on the Service remote control unit

5. Press " CH o / p " buttons on the Service remote

6. Turn the Power off and on again. (Main power but-

To obtain correct horizontal position of

If H. Position is incor-

Screen Control

---

Tape M. EQ. Spec.

--- Monoscope ---

Use Service remote control unit

and select " V-P " mode. (Display change " V-S ", " V-P ", " V-LI " and " V-SC " cyclically when " 9 " button is pressed).

control unit so that " V-LI " value becomes 11 and " V-SC " value becomes 20.

ton on the TV unit.)

CH o / p

buttons [ H-P ]

Mode

Mono-

scope

9. H. Size Adjustment

Purpose:

image.

Symptom of Misadjustment:

horizontal size of image on the screen may not be properly displayed.

Test Point Adj. Point Mode Input

Note:

1. Operate the unit for at least 20 minutes.

2. Receive the Monoscope Pattern.

3. Adjust VR561 so that the monoscope pattern will

4. Turn the Power off and on again. (Main power but-

To obtain correct horizontal size of screen

If H. Size is incorrect,

--- VR561 RF

Tape M. EQ. Spec.

--- Monoscope 90±5%

Use Service remote control unit

be 90±5% of display size and circle is round.

ton on the TV unit.)

Mono-

scope

10. PIN Cushion Adjustment

Purpose

screen image.

Symptom of Misadjustment:

rect, vertical line of image on the screen may not be properly displayed.

Test Point Adj. Point Mode Input

Note:

1. Operate the unit for at least 20 minutes.

2. Receive the Cross hatch Pattern.

3. Adjust VR562 so that the cross hatch pattern will

4. Turn the Power off and on again. (Main power but-

: To obtain correct straight vertical line of

If H.Pin cushion is incor-

--- VR562 RF

Tape M. EQ. Spec.

--- Cross hatch

Use Service remote control unit

be straight line of display.

ton on the TV unit.)

Cross

hatch

5-4 L6250EA

11. Cut-off Adjustment

Purpose:

screen voltage.

Symptom of Misadjustment:

reddish, greenish or bluish.

To adjust the beam current of R, G, B, and

White color may be

12. White Balance Adjustment

Purpose:

for pure white.

Symptom of Misadjustment:

or reddish.

To mix red, green and blue beams correctly

White becomes bluish

Test Point Adj. Point Mode Input

Screen-Control

---

Tape M. EQ. Spec.

---

Screen Control FBT --- Main CBA

Note:

F.B.T= Fly Back Transformer Use Service remote control unit

1. Degauss the CRT and allow CRT to operate for 20 minutes before starting the alignment.

2. Input the Black Raster Signal from RF Input.

3. Enter the Service mode. (See page 5-1)

4. Press " VOL p " button on the Service remote control unit and select " C/D " mode. (Display changes " C/D ", " CHROMA ", " 7F ", " LANGUAGE ", " STEREO TYPE ", " ACCESS CODE ", " STABLE SOUND ", " COMB FILTER ", " COMPONENT " and " AV MEMORY " cyclically when " VOL p " button is pressed.) then press " 1 ". The display will momentarily show " CUT OFF R " (R= Red). Now there should be a horizontal line across the center of the picture tube. If needed gradually turn the screen control on the flyback, clockwise until the horizontal line appears. Adjust the Red Cut off by pressing the " CH o / p " buttons. Proceed to Step 5 when the Red Cut off adjustment is done.

5. Press the " 2 "button. The display will momentarily show " CUT OFF G " (G=Green). Adjust the Green Cut off by pressing the " CH o / p " buttons. Proceed to step 6 when the Green Cut off adjustment is done.

6. Press the " 3 " button. The display will momentarily show " CUT OFF B " (B=Blue). Adjust the Blue cut off by pressing the " CH o / p " buttons. When done with steps 4, 5 and 6 the horizontal line should be pure white if not, then attempt the Cut off adjustment again.

CH o / p

buttons

Pattern

Generator

Figure

PATTERN GENERATOR

RF INPUT

See Reference

Notes below.

Fig. 2

Black

Raster

Test Point Adj. Point Mode Input

White

Screen

Tape M. EQ. Spec.

Use Service remote control unit

Note:

1. Operate the unit more than 20 minutes.

2. Face the unit to east. Degauss the CRT using Degaussing Coil.

3. Input the White Raster (APL 100%).

4. Set the color analyzer to the CHROMA mode and after zero point calibration, bring the optical receptor to the center on the tube surface (CRT).

5. Enter the Service mode. Press " VOL p " button on the Service remote control unit and select " C/D " mode. (Display changes " C/D ", " CHROMA ", " 7F ", " LANGUAGE ", " STEREO TYPE ", " ACCESS CODE ", " STABLE SOUND ", " COMB FILTER ", " COMPONENT " and " AV MEMORY " cyclically when " VOL p " button is pressed.) then Press No. 8 button on the Service remote control Unit.

6. Press No. 4 button on the service remote control unit for Red adjustment. Press N0. 5 button on the Service remote control unit for Blue adjustment.

7. In each color mode, Press " CH o / p " button to adjust the values of color.

8. Adjusting Red and Blue color so that the temperature becomes 9200K (x: 286 / y: 294)±3%.

9. At this time, Re-check that Horizontal line is white. If not, Re-adjust Cut-off Adjustment until the Horizontal Line becomes pure white.

10. Turn off and on again to return to normal mode. Receive APL 100% white signal and Check Chroma temperatures become 9200K (x: 286 / y: 294)±3%.

Confirm that Cut Off Adj. is correct after this

Note:

adjustment, and attempt Cut Off Adj. if needed.

CH o / p

buttons

Pattern

Generator,

Color analyzer

Figure

Color Analyzer

Raster

(APL

100%)

See below

Fig. 3

5-5 L6250EA

+ 39 hidden pages