LG RP-29FA40-O, RP-29FA40-P, RP-29FA40-R Service Manual

website:http://biz.LGservice.com

E-mail:http://www.LGEservice.com/techsup.html

COLOR TV

SERVICE MANUAL

CHASSIS : FA

MODEL : RP-29FA40-M

RP-29FA40-O

RP-29FA40-P

RP-29FA40-R

CAUTION

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

TABLE OF CONTENTS

TOC -1 FA - TOC

SECTION 3 SERVICING

SECTION 1 GENERAL INFORMATION

PRODUCT SAFETY SERVICING…..…….……... i-ii OVERVIEW…………………………….……... 1-2 REMOTE PROGRAMMING…………….…...….. 1-3 PROGRAMMING THE REMOTES……………. 1-4 AUTO FIND……………………………….. 1-4 CABLE BOX……………………………….. 1-4 VOLUME OVERRIDE……………………….. 1-4 AUXILIARY CAPABILITY………………….. 1-4 UNIVERSAL ERASER 911………………….. 1-5 PROGRAMMING CODES……………………. 1-6 USER MENUS…………………….……….….. 1-7 CHANNEL MENU…..…………………………. 1-7 PICTURE MENU…….………………………... 1-8 SOUN MENU...……………………………….. 1-8 LOCK MENU……..…………………………… 1-9 SPECIAL MENU……………………………… 1-11 MISC DISPLAYS……………………………… 1-12

SECTION 2 FACTORY MENU

INSTALLER MENU………………………… 2-1

VIDEO PROCESSOR ……………….…………. 6-11 EDGE CONNECTORS CIRCUIT…………………. 6-12 AUDIO VIDEO SWITCH………………………. 6-13 COMB FILTER CIRCUIT…..…………………… 6-14

LARGE SIGNAL……………………………. 3-1 POWER SUPPLY ALIGNMENT PROCEDURES………………… 3-2 DEFLECTION………………….…………… 3-3 SMALL SIGNAL……………………………. 3-3 SUMMARY OF AUDIO/VIDEO SIGNALS……. 3-5 DIGITAL COMB FILTER…………………… 3-6 ADJUSTMENT PROCEDURE ……………….. 3-7 IF & AUDIO SERVICING.………………….. 3-9

SECTION 4 PARTS

MODEL PARTS RP-29FA40………….…….….. 4-16

SECTION 5 EXPLODED VIEWS

RP-29FA40-M, RP-29FA40-P, RP-29FA40-O, RP-29FA40-M………………………………...

SECTION 6 SCHEMATICS

INTERCONNECT DIAGRAM……………………. 6-1 POWER SUPPLY………………………………. 6-2 VELOCITY SACN MOD………...………………. 6-3 VIDEO OUTPUT………………………………. 6-4 DEFLECTION CIRCUIT…..……………………. 6-5 PWS CIRCUIT…..……………………………. 6-6 MICROPROCESSOR… …..……………………. 6-7 KEYBOARD CIRCUIT…..……………………… 6-8 AUDIO CIRCUIT…..……….…………………. 6-9 FRONT JACK CIRCUIT…..……………………. 6-10 VIDEO PROCESSOR ……………….…………. 6-11

5-1

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS

IMPORTANT S AFETY NOTICE

This manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

Special components are also used to preven t x-radi ation, sh ock an d fir e hazard . These components are indicated by the letter “x” included in their component designators and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics Corporation.

Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of th e latest safety and perform ance improvem ent changes in to the set is not delayed until th e n ew servi ce liter ature is printed.

Caution: Do not attempt to modify this product in any way. Never perform customized installations without manufacturer’s approval. Unauthorized modifications will n ot only voi d th e warrant y, but may lead to property dam ag e or user injury.

Service work should be performed only after you are thoroughly familiar with these safety checks and servicin g guidelines.

Graphic symbols

The exclamati on point within an equilateral triangle is intended to alert the service personnel to important safety inf ormation in the service literature .

The lightning flash with arrowh ead symbol within an equilateral triangle is intended to alert th e service personnel to th e presen ce of noninsulated “dan g e r ous voltag e” that m ay be o f suffi ci en t magnitude to constitute a risk o f electric shock.

The pictorial repr esen tati on of a fuse and its rating within an equilateral triangle is inten ded to convey to the service personn el the following fuse r eplacemen t caution notice: CAUTION: FOR CONTINUED PROTECTION A G AINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RA TING AS MARKED NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transf orm er f or pr otecti on fr om A C lin e sh ock. After the original service problem has been corrected, make a check of the

following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of adjacent component shorts. This is especially important on items transported to and from the repair shop.

2. Verify that all protective devices such as insulators, barriers, covers, shields, strain reliefs, power supply cords, and other hardware have been reinstalled per the original design. Be sure that the safety purpose of the polarized line plug has not been defeated.

3. Soldering must be inspected to discover possible cold solder joints, solder splashes, or sharp solder points. Be certain to remove all loose foreign particles.

4. Check for physical evidence of damage or deterioration to parts and components, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.

5. No lead or component should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.

6. After re-assembly of the set, always perform an AC leakage test on all exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST . Use an AC voltm eter having 5000 ohm s per volt or more sensitivity in the following m ann er: Conn ect a 1500 ohm, 10 watt resistor, paralleled by .15 mfd 150V AC type capacitor between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15mfd capacitor. Reverse the AC plug by using a nonpolarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

A.C. Voltme ter

Good Earth Ground such as the Water Pipe, Conduit, etc.

0.15uF

1500 OHM

10 WATT

Place this probe on each exposed m e ta l pa rt.

X-RADIATION

1. Be sure procedures and instructions to all service personnel cover the subject of x-radiation. The only potential source of x-rays in current TV receivers is the picture tube . H owever, this tube does not emit x-r ays when the HV is at the factory-specified level. The proper value is given in the applicable schematic. Operation at higher voltages may cause a failure of the picture tube or high-voltage supply and, under certain circumstances may produce radiation in excess of desirable levels.

2. Only factory-specified CRT anode connectors must be used.

3. It is essential that the service personnel have available an accurate and reliable high-voltage m eter .

4. When the high-voltage cir cuitry is operating properly, there is n o possibility of an x-radiation problem. Every time a color chassis is serviced, the brightness should be run up and down while monitoring the high voltage with a meter, to be certain that the high voltage does not exceed the specified value and that it is regulating correctly.

5. When troubleshooting and making test measurements in a product with a problem of excessively high voltage, avoid being unnecessarily close to the picture tube and the high voltage power supply. Do not operate the product longer than necessary to locate the cause of excessive voltage.

6. Refer to HV, B+, and shutdown adjustment procedures described in the appropriate schematics and diagrams (where used).

IMPLOSION

1. All direct view picture tubes are equipped with an integral implosion protection system; take care to avoid damage during installation.

2. Use only the recommended factory replacement tubes.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a factor, near steam radi ators where steam leak age is a factor, etc.

3. Avoid placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that might obstruct ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit must follow the factory-approved mounting instructions. A product mounted to a shelf or platform must retain its original feet (or the equivalent thickness in spacers) to provide adequate air flow across the bottom. Bolts or screws used for fasteners must not touch any parts or wiring. Perform leakage tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart. Caution the customer on the hazards of trying to roll a cart with small casters across thresholds or deep pile carpets.

7. Caution customers against using a cart or stand that has not been listed by Underwriters Laboratories, Inc. for use with its specific model of television receiver or generically approved for use with TVs of the same or larger screen size.

8. Caution customers against using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS

X-RADATION

To prevent possible exposure to x-radiation caused by excessive CRT Anode Voltage, the FA Chassis incorporates a “High Voltage Shutdown” circuit. This cir cuit senses the level of a flyback pulse from the “Flyback Transformer” representative of the actual high voltage on the CRT anod e. Wh en this level exceeds a pr edetermined voltage, the circuit shuts down the horizontal drive, preventing further generation of anode voltage. In this condition, the horizontal drive is ‘‘latched’’ off for about 5 seconds, after which, restart, is attempted.

SHUTDOWN CIRCUIT OPERA TION

The Shutdown pulse voltage from pin 3 of TX3200 (Flyback Transformer) is peak detected (rectified bythe action of diode DX3001 and capacitor CX3001. This form a DC voltage appearing on CX3 representative of the CRT anode voltage (HV) produced by TX3200. This voltage is divided down by precision resistors RX3003 and RX3004. This lower voltage appears on Emitter of QX3001. In the event the CRT anode voltage become excessive, the voltage in Emitter of QX3001 will be higher than voltage in Base of QX3001 (Base voltage is fixed by ZDX3002) and therefore QX3001 enters in conduction mode. Therefore a dc voltage will appear on RX3007 and this voltage will put QX3002 in saturation. A high voltage level (5.66V aprox.) is sent to pin 32 (X-Ray) of video processor IC2200 stopping H oscillation and H output (pin 34) becom es low. If the shutdown condition disappears TV set can be turned-on by using the on/off button.

SHUTDO WN SAFETY CIR C UIT

HV SHUTDOWN MEASUREMENT PROCEDURE

1. Adjust the beam current to OmA in NTSC mode.

2. Apply a variable DC voltage to pin 10 of th e PTD1 connector , from 20 to 0 Vdc, starting at 20 Vdc.

3. Slowly decrease supply towards zero.

4. Remote DC voltage from pin 10 of PTD1.

5. After approximately 5 seconds, verify that the HV must be reestablished (High Voltage Reset).

HIGH VOLT A GE SHUTDOWN TEST

Before to turn the TV on, and after discharging the CRT, connect a high impedance – high voltage meter to the CRT anode. Apply a voltage signal from an external power supply through the shutdown test circuit (see Fig. below). Turn the television ‘on’ and confirm a good signal is being displayed. Reduce Brightness and Contrast settings until the picture is well extinguished. Wait until the Video Menu or display may disappear. Read HV meter, ramping up the external power supply from 0 to 8 volts, the HV increase until the High Voltage shutdown, read the high voltage on the HV meter just before the voltage start dropping.

CRT Anode Voltage

CRT Screen SIZE Nominal Anode Voltage Min. Shutdown Voltage Max. Shutdown Voltage

27 Flat 30 – 1.0 Nominal HV + 2 36

(KV) (KV) (KV)

1212

CRT ANODE HIGH VOL TA GE MEASUREMENT PROCEDURE

Each CRT screen has it’s own safe opreating Anode Voltage and shutdown voltage. Critical Safety components (designated and shutdown voltage. Cristal Safety components (desiganted with a n “X” in the components desigantor) are designed to operate the CRT at a safe operating . Anode voltage and provide proper shutdown thresholds. If replacement of any ofv these components are deemed necessary, it is important to use original type Zenith replacement components. After a replacement is made, confirm proper Anode voltage using the following precedure. Measurement of the CRT Anode voltage must be performed whit not visible raster on the screen and operating at nominal horizontal scanning frecuency 15.734 Khz. After discharging the CRT, connect a high impedance high voltage meter to the CRT anode. Turn the television ‘on’ and confirm a good signal is being displayed. Reduce Brightness and Contrast settings until the picture is well extinguished. Observe the Anode voltage meter reading and compare with the table for the proper CRT screen size. If the voltage reading is higher than the maximum, verify circuit component values and proper operation.

MBR3447LG MODEL REMOTE CONTROL

124-00233-P09

FLASHBK (Flashback)

Returns to previous Channel.

SURF

Turns Channel Preview On/Off.

When on, the Channel Up/Down

keys only Scroll through channels

selected in the Add/Del/Blnk.

POWER

Turns TV On or Off.

MODE

Selects the remote's mode of operation

MUTE

Turns sound Off and On while picture remains.

CHANNEL (Up/Down)

Selects next channel in

TV’s memory. Press

and hold to repeat.

NUMBER PAD

Selects channels directly.

Displays menus for TV

and other options.

LEFT/RIGHT ARROWS

Chooses and shows the

desired menu option.

A, B, C Keys

In commercial TV’s, doesn’t

have functionallity.

TIMER

Displays the Sleep Timer menu.

Press repeatedly to set desired

TV shut-off time.

VOLUME (Left/Right)

Increases TV’s sound level.

ENTER

Shows Channel/Time, enters channel, or removes any on-screen menus.

QUIT/ (Three Functions Key)

It doesn’t function in commercial TV.

UP and DOWN ARROWS

Moves highlighted bar within menu to select an option.

Displays closed caption menu.

TV/VCR SOURCE

Steps through source options.

MBR3447LG

1-3 FA - REMOTES

REMOTE PROGRAMMING

PROGRAMMING THE REMOTE

If you’re using Zenith products, the remote is already programmed for most common codes: TV= 101, VCR= 201, CABLE=353, and AUX=401. For other brands, or if your remote fails to control your Zenith products, you’ll have to program the remote.

After installing the batteries, follow these steps for each product:

1. Press and hold PRG using a blunt pointed object. Release PRG after the indicator light turns on.

2. Press the device button to be programmed (CATV, VCR, AUX, or TV).

3. Enter the 3-digit product code from chart on the next page.

4. Press and release ENTER to save the code.

5. Point the remote at product and press POWER to test the product’s operation. If it does not turn on, reprogram remote using a different code.

6. Write the code on the label inside the battery compartment for future reference.

AUTO FIND

If none of the codes in the code table operate your equipment, use Auto Find to search for the proper code.

1. Turn on the product you want to operate.

2. Press and hold PRG using a blunt pointed object. Release PRG after the indicator ligth turns on.

3. Press any key to be programmed (CAT, VCR, AUX, or TV).

4. Enter ”000”, then press ENTER within two seconds. Auto Find is active after the indicator light flashes and remains lit.

5. Point the remote at the product.

6. Press and release POWER repeatedly, about once a second, until your products turns off. The indicator light turns off when you press POWER and on when you release it.

7. Press ENTER immediately to save the code. The indicator light flashes to indicate the code has been saved.

8. Press POWER to turn On your product.

9. Test your product. If the remote fails to operate some of the basic functions, use Auto Find again to search for a better code. (Auto Find resumes its search after the last code that was entered and saved in step 7).

NOTE: If the indicator light stays on as you press POWER,

Auto Find has tried all of the codes. If the product you want to control has not turned off, your remote will not work with that product. To cancel Auto Find, press PRG at any time during Auto Find.

CABLE BOX

This remote can control the cable/converter box volume and muting (instead of the TV’s) is available on your equipment.

1. Program the cable/coverter box normally.

2. After programming the cable/converter box. Press and hold PRG again using a blunt pointed object. Release PRG after the indicator light turns on.

3. Press and release the device button the cable box is assigned to.

4.This time, enter the special code 3-9-9 instead of the product code.

5. Press and release ENTER to save.

VOLUME OVERRIDE

These remotes can override TV, VCR, or Video Disk Player volume functions with an amplifier’s volume and muting.

1. Program the amplifier normally.

2. After programming the amplifier, Press and hold PRG again using a blunt pointed object. Release PRG after the indicator light turns on.

3. Press and release the device button whose volume control is to be replaced by the amplifier volume control. For example, pressing TV will operate the amplifier’s volume while the remote is in TV mode.

4. This time, enter the special code 4-9-9 instead of the product code.

5. Press and release ENTER to save.

AUXILIARY CAPABILITY

This remote can control up to seven devices. If the remote has been programmed for four components using the TV, VCR, CABLE, and AUX keys, you may also program it for up to three additional using AUX+1, AUX+2 and AUX+3

To Program AUX+1, AUX+2 AND AUX+3

1. Locate three digit code for product in code table.

2. Press and hold PRG until indicator lights up

3. Press the AUX and 1 simultaneously to select AUX+1.

4. Enter the three-digit code and press ENTER. The indicator light should flash and then turn off to indicate the code has been accepted. If the light stays on, repeat steps 3 and 4 or try a different code.

5. Repeat steps 2-4 for AUX+2 and AUX+3.

6. Write the codes on the labels inside battery compartment for future reference. Hold down AUX and press 1,2 or 3 to access AUX+1, +2 or +3 mode.

FA - REMOTES 1-4

REMOTE PROGRAMMING (continued)

UNIVERSAL ERASER 911

To restore the transmitter back to its initial default settings, enter the Programming Mode as usual (by holding PRG until the LED indicator lights), and press 9 1 1, followed by ENTER. The LED indicator will flash three times to indicate that the transmitter has returned to its initial default brand codes. Universal Erase will work in any mode.

1-5 FA - REMOTES

PROGRAMMING CODES

TV’s

Daewoo 149 ProScan 216,260,266, Sprucer 313 Sharp 441,442 Zenith 101,121,149 282,725 Stargate 326,379 Sherwood 449 152 Quasar 259,295 Standard Comp 335 Hitachi 950

TV/VCR

Adventura TV/VCR 154 240,242,249, Tocom 317,318,346 Luxman 930 Daewoo TV/VCR 148 260,266,282, Unika 325,348,362 Magnavox 421,422,433, Funai TV/VCR 154 283,284,285, Universal 325,358,362 434 Goldstar TV/VCR 153,172 286,287,288, Vid Tech 340 Sony 420,443,444, Symphonic TV/VCR 154 708,710,711, Video Way 349 445,934 Zenith TV/VCR 150,153,154 725 V i ewstar 327,35 4,35 5, Soundesign 461,498,901, 172 Realistic 212,213,265, 372 902

VCR’s

Admiral 261 Salora 297 Technics 432 Akai 292,717,718, Samsung 220,230

719,720 Sansui 289,292,709, Alphastar 516 Zenith CD Reco Audio Dynamics 726 726 Chaparral 501,502 Zenith 460,461,498, Bell + Howell 247 Sanyo 212,247,294 Cheyenne 502 901,902 Broksonic 221,250,255, Scott 243,290,729 Dishnet 515

729 Sears 211,212,213, Drake 503 Candle 727 265,274 GE 510,517 Citizen 914 Canon 704 Sharp 261,730 General Instruments 504,505 GE 916 Capeheart 728 Signature 2000 216,219,249 Hitachi 519,520 Goldstar 460,474 Citizen 727 Sony 232,723,724 Hughes Network 514 Hitachi 919 Craig 212 Sylvania 275,297 JVC 518 JVC 908 Curtis Mathes 259,266,725, Tatung 268,292 Macom 314 Kenwood 484

727 Teac 268 Magnavox 521 Luxman 467 Daewoo 244,246,248, Teknika 272 Philips 521 Marantz 903,913

254,703,729 Toshiba 213,274,290, PrimeStar 513 Memorex 485 Daytron 246 297 ProScan 510,517 Nad 904 DBX 726 Vector Research 726,727 RCA DSS 373 Nakamichi 493 Electrohome 730 Victor 726 RCA 510,517 Onkyo 471,906 Emerson 203,221,243, Video Concepts 726,727 Realistic 506 Optimus 905

250,293,721, XR - 1000 243 Sierra I 502 Panasonic 912

722,729,730, Yamaha 726 Sierra II 502 Pioneer 470,485,907

731,732 Zenith 201,224,225, Sierra III 502 Proton 910 Fisher 211,212,213, 229 Sony 511 Quasar 912

247,265,274 STS1 507 RCA 909 GE 216,220,266, STS3 508 Sharp 483,917,918

282,701,702,

725 Allegro 358,362 Uniden 522 Sony 486,489,490, Go Video 256,262,263, Allegro A-B Switch 361 United 344 491,492

700 Archer 325 Zenith Drake 312,328,330 Soundesign 461,498,901, Goldstar 253 Century 325 Zenith 351,378,500 902 Harman Kardon 296 Citizen 325 Toshiba 915 Hitachi 257,270,273, Comtronic 326

292,705,706, Everquest 379 Sony 452 Victor 908

707,708 Garrard 325 Zenith 460,461,498, JC Penney 268,726 GE 367 Jensen 292 Gemini 305,331,338 ADC 940 JVC 224,225,258, General Instrument 304,305,306, ADO 939

268,292,299, 307,308,309, Aiwa 938 JVC 965

726 310,318 Akai 937 Mitsubishi 964 Kenwood 268,292,726, Hamlin 302,303,345, Denon 935 Pioneer 963

727 365,366 Dynatech 953 Sony 962 Magnavox 275 Jasco 325 Emerson 952 Toshiba 961 Marantz 267,268,726, Jerrold 304,307,308, Fisher 438,933,951 Zenith 960

727 309,310,318, GE 932 Memorex 212,298 360,363 Goldstar 460 MGA 297,730 Kale Vision 335 Hitachi 950 Mitsubishi 276,277,278, Macom 321 Kenwood 441, 931, 948

279,280,296, Magnavox 327,334 JVC 949, 954

297,730 NSC 335,339,368, Luxman 930 Montgomery Ward 216,219,249, 369,370 Marantz 929,947

291,730 Oak 311,332,342 MCS 928 Multitech 727 Panasonic 313,320 Mitsubishi 927 NEC 267,268,269, Philips 325,327,347, Nakamichi 925,926

281,292,709, 350,352,354, Onkyo 923,924,946

726 355 Optimus 920,921,922 Orion 250 Pioneer 315,343 Panasonic 431,432,945 Panasonic 245,251,259, RCA 341 Philips 421,433,434

713,714,715, Regency 329 Pioneer 431,435,944

716 Samsung 326,335 Quasar 432 Pentax 708,727 Scientific Atlanta 316,323,336, Radio Shack 431,441 Philco 275 337,364 RCA 437,943 Pioneer 210,282,726 Signal 326 Sanyo 438,439

Portland 246,727 SL Marx 326 Sears 936

Radio Shack 213,265,730 Teleview 326 JVC 949,954 RCA 216,220,228, Texscan 339,356,371 Kenwood 441,931,948

Saisho 722 Zenith PM 374 Teac 418,419

730 Zenith HT-2000 353 Sylvania 433

SATELLITE

Yamaha 414,941,942

415

TUNER/AMP

CATV

Toshiba 509,512 Sherwood 900

AUDIO - TAPE DECKS

COMPACT DISC

Technics 912

901,902

DVD Players

FA - REMOTES 1-6

USER MENUS P221-01524-00

CHANNEL MENU

Below is the Channel Menu for the FA chassis with each of its options.

EZ PROGRAM

The EZ Program feature automatically searches for all available channels and marks them as ‘Added’ so that they may be accessed via the channel Up/Down key.

CHAN NEL

EZ Program Add/Del/Surf EZ Clock Captions Caption/T Langua ge Source

MOVE NEXT EXIT

In the EZ Program option, the current RF input type (Off Air Antenna or Cable TV) is highlighted. Use the Up/ Down Arrow keys to change the RF input type.

To start th e EZ Progr am, press th e Right Arr ow key. If the Cable TV input type is selected, the EZ Program routine will determine what type of cable system is present.

ext

ENTER

ADD/DEL/SURF

After running the Auto Program, all channels found by the Auto Program feature will be marked ‘Added’. However, some of these channels may be scrambled, or undesired by the customer. The Add/Del/Surf feature allows the customer to selectively mark any channel as ‘Deleted’ or ‘ A d d ed’. To change the status of a channel, press the Up/Down Arrow keys. To change the channel while adding or deleting channels, use the Channel Up/Down keys, or press the desired channel digits, followed by the ENTER key. If only one channel is present, to change the channel the customer must use the digit keypad to select a channel.

EZ CLOCK

When the EZ Clock item is selected, pressing the Right Arrow key allows entry into the clock set menu.

CLOCK

Manual

Clock M ode

Time S et

MOVE MOVE NEXTNEXT BACKBACK

Manual

Auto

ENTERENTER

Notes:

• EZ Program clears all Surfing channels, which were added.

• While searching for channels, all keys except for the Power key are disabled. This prevents an incomplete EZ Program procedure.

• Running the Auto Program will clear the factory mode, if it was active. This happens at the end of the EZ Program.

• If the EZ Program line in the Setup Menu is ‘red’, this indicates that the module did not pass by Chassis. When ‘green’, this indicates that the module did not pass by Tracking. When ‘blue’, this indicates that the module did not pass by Programming. To clear this line to ‘white’, set the upper nibble of the EEPROM location $1FFh to $B0h.

• If no channels are found then the following message will appear: “Make sure that the cable/ant. is

connected, and try again.”

DAYLIGHT SAVINGS TIME

The customer also has the option of selecting the Daylight Savings Time to be On, Off or Auto using the Left/ Right Arrow keys.

CAPTIONS

This feature allows the customer to select: Off, On, or EZ when Muted options. To change the status of captions, press the Left/Right Arrow key to select either On, Off, or EZ Mute.

CAPTION/TEXT

This feature allows the customer to activate or desactivate Captions or Text. Pressing the Left/Right Arrow keys sequentially through each of the following Caption/Text options. Caption 1 Caption 2 Caption 3 Caption 4 Text 1 Text 2 Text 3 Text 4

1-7 FA - MENUS

USER MENUS P221-01524-00 (continued)

Notes:

• When the Text option is selected and a text box appears, if the CC key is pressed, the Caption box that allows setting to On, EZ Mute or Off will appear ,

• When captions are being displayed, if one of the V olume Up/Down keys is pressed, the volume bar will not appear.

• When the Captions are not activated and the CC key is pressed, the Caption Box will appear, that allows choose On, EZ Mute or Off.

LANGUAGE

This feature allows the customer to change the menu language to English, Spanish or French by pressing the Up/Down Arrow keys.

SOURCE

This feature allows the customer to select: Antenna, Rear Video, Rear-SV, Front Video, or Comp. Video.

PICTURE MENU

All menu items are adjusted with the Left/Right Arrow keys.

COLOR TEMP

Sets the color temperature. The two settings are COOL and WARM.

EZ PICTURE

This feature allows the customer to maintain 8 separate Contrasts, Brightness, Color, Tint, Sharpness by setting “Custom, Normal, Movie, Digital, Video Game, Sports, Night Time, Weak Signal”.

SOUND MENU

All menu items are adjustment with the Left/Right Arrow keys.

SOUND

Bass Treble Balance Audio m ode Front Surr EZ Soundrite EZ Sound

MOVE NEXT EXIT

ENTER

PICTURE

Contrast Brightness Color Tint Sha rpness Color Temp EZ Picture

MOVE NEXT EXIT

ENTER

CONTRAST

Contrast adjustment has 101 steps (0 to 100).

BRIGHTNESS

The brightness value sent to the video processor is (RfBrt + Customer Brightness) if the source is the RF source, or (AuxBrt + Customer Brightness) if the source is the AUX source. RfBrt and AuxBrt appears in the factory menu.

COLOR

Color adjustment has 101 steps (0 to 100). The color value sent to the video processor is according to the next equation and look up table.

TINT

Tint Adjustment has 101 steps (0 to 100). A center mark indicates step 50. The tint value sent to the video processor is (custom Tint + TintOffset)*127

SHARPNESS

Sharpness adjustment has 101 steps (0 to 100).The sharpness value is sent to the video processor as (Custom Sharpness).

BASS

Bass adjustment has 101 steps (0 to 100).

TREBLE

Treble adjustment has 15 steps (0 to 14).

BALANCE

Balance adjustment has 29 steps (0 to 28).

AUDIO MODE

There are three audio modes available: Mono, Stereo, 2 Audio/SAP. If 2nd Audio/SAP is selected, but the current channel does not support SAP, then either Stereo or Mono will be heard.

FRONT SURR

Front Surround can be set ‘ON’ or ‘Off’, regardless of the current Audio Mode setting. However, the Front Surround effect can only be heard when the Audio Mode has been set to ‘Stereo’ and a Stereo signal is present. When this condition exists, there will be a short mute (200ms) while toggling the Surround ‘On’ to ‘Off’, to embellish Front Surround activation.

FA - MENUS 1-8

USER MENUS P221-01524-00 (continued)

EZ SOUNDRITE

The Sound Rite feature is used to obtain a uniform volume level, particularly while changing channels. The Sound Rite feature can be best demonstrated on a channel with no signal (snow).

EZ SOUND

The EZ Sound Control has six selections the customer can select. The selections available are: Custom, Normal, Stadium, News, M usi c and Theater. The Left/Right Arrow keys may be used to select any of the choices mentioned.

LOCK MENU

As show above, with the Lock Menu on-screen, use the Up/Down arrow to highlight an option Like Content Blk, then press ENTER. Use the Up/Down/Left/Right arrows to select and adjust or set the rating for an option. For Sex Scenes for example , use the “From TV-PG” setting. (See the Mini Glossary, Ratings Charts on this and the previous page for rating definitions).

LOCK

Aux Sources MPAA Age Block Conten t Blk Cdn. Ratings Set Hours Set Password Lock On/Off

MOVE NEXT EXIT

AUX SOURCES

To Block or Unblock the sources, press the Up/Down Arrow keys. The SOURCE key may be used to view the other source.

MPAA

The MPAA selector allows the customer to select either to have the channel Unblocked, G and Above, PG and Above, PG-13 and Above, R and Above, NC-17 and Above, or X.

AGE BLOCK

Use the Right Arrow key to select the Age Block Menu. Once entered into the Age Block Menu, the customer has the option to block channels for general age or to block channels for children.

ENTER

GENERAL BLOCK

To block channels for a general age, the customer may either select: Unblocked, TV-G and Above, TV-PG and Above, TV-14 and Above or TV-MA.

AGE

General

Children

MOVE NEXT BACK

Unblocked TV-G TV-PG TV-14 TV-MA

ENTER

CHILDREN BLOCK

T o block chann els f or children, select either: Unblocked, TV-Y and Above or TV-Y7.

CONTENT BLOCK

To block a television program according to its content, use the Right Arrow key to select the Content Block Menu.

CONTENT

Dialog

General

Language Violence Sex Scenes F Violence No Rating

MOVE NEXT BACK

Unblocked TV-PG TV-14

ENTER

DIALOG BLOCK

T o block a television pr ogr am with Dialog r ating, use th e Up/Down Arrow keys to select either: Unblocked, TV-PG and Above or TV-14.

LANGUAGE BLOCK

To block a television program with Language rating, use the Up/Down Arrow keys to select either: Unblocked, TV-PG and Above, TV-14 and Above, or TV-MA.

VIOLENCE BLOCK

To block a television program with Violence rating, use the Up/Down Arrow keys to select either: Unblocked, TV-PG and Above, TV-14 and Above, or TV-MA.

SEX SCENES BLOCK

To block a television program with Sex Scenes rating, use the Up/Down Arrow keys to select either: Unblocked, TV-PG and Above, TV-14 and Above, or TV-MA.

1-9 FA - MENUS

USER MENUS P221-01524-00 (continued)

F VIOLENCE BLOCK

To block a televisi on program with F Violence ratin g, use the Up/Down Arrow keys to select either: Unblocked, TV-Y7.

NO RATING BLOCK

To block a television program with No Rating , use the Up/Down Arrow keys to select either: Unblocked and Blocked.

CANADIAN RATINGS

Use the Right Arrow key to select the Content Block, and use the Left/Right Arrow keys to select the Cnd. English or Cdn. French.

CDN. RATINGS

Cdn. English

General

Cd. French

MOVE NEXT BACK

Exempt Children 8+ General PG 14+ 18+

ENTER

SET HOURS

Use the Up/Down Arrow keys to adjust the number of hours the Parental Control feature will be active. The valid hour range is 1 through 99 hours.

SET PASSWORD

Press the Right Arrow key to allow Password entry.

TO ENTER PASSWORD

The software accepts four-digit codes only. The customer must enter a password

RE-ENTERING PARENTAL CONTROL MENU

If the Parental Control feature has been activated, the software will not allow immediately entry into the Parental Control Menu. Instead, it will prompt for the correct password. If the correct password is entered, the Parental Control menu will be unlocked so the user can change the configuration for parental options. If an incorrect password is entered, an error message (“Not Accepted!) appears, and will not disappear until 5 seconds. This extended time provision increases the amount of time necessary for a child to “crack” the password.

Notes:

• The Parental Control menu will remain up for 15 seconds after the last key press.

• The QUIT key may be pressed to remove the PC menu.

• Entry into the Factory Menu will immediately turn off the PC feature

• The PC Hours and Password will be cleared upon exit of the Parental Ctrl menu (unless the Parental Ctrl feature has been turned on.)

DISPLAY WHEN PARENTAL CONTROL IS ACTIVE

When the Parental Control has been activated the channel is blocked. The display on the screen shows two lines. The first line displays a message saying that the “PARENTAL LOCKOUT IS ACTIVE.” The second line displays the amount of time (in hours) left in the lockout.

REPEAT PASSWORD

After a four-digit code has been entered, the software requires the customer to re-enter the same four-digit code.

PASSWORD NOT ACCEPTED!

If an invalid code is entered, or the two codes entered do not match, a blinking error message (“Not Accepted!”) will appear . This error message also appears wh en no code is entered for the password or if only one digit is entered and no other digit has been entered.

LOCK ON/OFF

This item turns the Parental feature On or Off. The Parental Ctrl. feature can only be turned on if the hours > 0, and a password has been set. Otherwise the Lock On/ Off line will display either of the following error messages: “Must Set Hours” or “Must Set Password.”

FA - MENUS 1-10

USER MENUS P221-01524-00 (continued)

SPECIAL MENU

This Menu contains the EZ Timer , Ch. Labels, XDS Display, EZ Demo and EZ Help.

SPECIAL

EZ Timer CH. Labels XDS Display EZ Demo EZ Help

MOVE NEXT EXIT

EZ TIMER

The Timer Menu contains the Sleep Timer and the On/Off Timer features.

SLEEP TIMER

Sleep Timer (via Timer Menu) The Left/Right Arrows can be used to adjust the current sleep timer setting: Off, 0:10, 0:20, 0:30, 1:00, 1:30, 2:00, 3:00 or 4:00

SPECIAL

EZ Timer

EZ Tim er

CH. Labels XDS Display EZ Demo EZ Help

MOVE NEXT BACK

ENTER

PRESS

TO SET

CHANNEL LABELS OPTION

This feature allows the customer to select a channel label for the current station. This channel label is displayed in the Channel/Time display. Initially , all channel labels are set to ‘——‘, which results in no channel being displayed in the Channel/Time display.

CHANN EL LABE LS

A&E CMTV ESPN HSE NOS TBN VC ABC CNCB ESP2 HSN PBS TELE VCR ACTS CNN ET IC PLAY TLC VH-1 ADC COM EWTN INSP PTL TMC VISN AMC CSPN FAM JCN QVC TNN VJN BCC CSP2 FNN LIFE RDS TNT WB BET CTN FOX MAX REQ TRAV WGN BRAV CTV F&V ME /U SC TSN WTBS CA D IS FX MMT SCFI TVA WWOR CBC DISC GALA MTV SHOW TWC YTV CBN E! HBO NBC SIN UPN ---CBS ENC HN NICK TBS USA

None

T o chan g e the current channel label, press the Up/Down Arrow key. To change the channel while adjusting channel labels, use the Channel Up/Down keys, or press the desired channel digits, followed by ‘Enter’. (If Channel Up/Down is pressed, the next or previous channel which was marked ‘Added’ will appear.)

ON/OFF TIMER

This feature consists of three menu lines: “On Time”, “Off Time”, and “On/Off Timer”. This feature allows the set to turn on and off at the times specified in “On Time” and “Off Time”. The “On Time” and “Off Time” are set identical to the Clock Set feature in the Channel Menu. An Off Time must be specified, before turning on the “EZ Timer”—otherwise an error message (“Must Set On/Off”) will be displayed on the On/Off Timer line. The On/ Off Timer option turns the Timer On or Off. If there is no Off Time set, then the On/Off Timer displays the above message saying: “Must Set Off Timer.” Once the Off timer has been set, the customer can then set the option to either On or Off.

Note:

• When in the channel label is selected ————, then the Auto channel label is activated, in other words, the program automatically take the channel label of the signal that is send by broadcasting through the XDS service.

• If the label None is selected, the Auto channel label is disactivated.

XDS DISPLA Y

Pressing the Left/Right Arrow Keys allows the customer to select the XDS Display either On or Off.

1-11 FA - MENUS

USER MENUS P221-01524-00 (continued)

EZ DEMO

The EZ Demo is designed to show-off the icon menus and other icon displays on the sales floor . The EZ Demo feature can be turned On/Off with the Up/Down Arrow keys. Initially, when the feature is activated, as soon as the OSD times out, the EZ Demo will start. At this point, pressing any key will temporarily disable the EZ Demo for 18 seconds, and if the EZ Demo is working and the Menu key is pressed then the Special Menu will be displayed and the EZ Demo feature will be selected allowing the customer to disable it.

Note:

• The Auto Demo On/Off setting is not stored to the EEPROM.

EZ HELP

The special features EZ Help option may be accessed using the Right Arrow key. The EZ Help feature provides help on certain options and also provides support for the EZ Programm, Add/Surf/Del, Degaussing, EZ Picture and EZ SoundRite features. There is a simple explanation of each options.

The EZ Help has a main screen called EZ Help. This screen gives a solution to the most common problems that a customer may encounter; i.e., To program channels.

MISC DISPLAYS

SLEEP TIMER

To press the timer key for activate the sleep timer. The user can choose to activate the timer to turn off the Television in 10, 20 or 30 minutes or 1, 1:30, 2,3 or 4 hours just by clicking on the sleep timer clock.

VOLUME DISPLA Y

When the Volume key is pressed, the following display appears on the screen.

CLOSED CAPTIONS

If the CC key is pressed the following displays appears. The customer may change the settings of the Closed Captions to Off, On or EZMute

CHANNEL/TIME/AUDIO DISPLA Y

Pressing the ENTER Key allows the customer to display the channel, time audio mode as well as information of the current program along with the rating of the program.

OFF

FA - MENUS 1-12

SECTION 2

INSTALLERS MENU

FACTORY MENU

INSTALLERS MENU

Access the Installer’s Menu by using the remote control or the keyboard on the front of the set.

With the remote: Press & Hold MENU key until the Channel/Time display appears, then press 9, 8, 7, 6, and ENTER.

With 6 button keyboard: Press and hold MENU until the Channel/Time display appears. Simultaneously press the VOLUME UP and CHANNEL DOWN keys.

Notes:

• When the factory mode is set to “1”, then

press ‘9’, ‘8’, ‘7’, and ‘6’, followed by ‘ENTER’ to access the Installer’s Menu.

• To acces the G2 re-adjustment mode, press 2 hold

the Menu key until the Channel/Time display appears, then press ‘9’, ‘8’, ‘7’, ‘6’, and quit key.

00 Fact Menu: Use the Select key to select item #00,

which is the first item in the Installer’s Menu. The Factory Mode item should always be left off (Zero is off). When left in this mode, only items from 0 to 27 are visible. When the factory mode is set to 1, all menu (Audio or Video settings) items will be available. Also they will appear on the screen one at a time at the top left of the screen.

When The Factory Mode is on, the Factory Menu line appears at the middle of the screen to allow for proper setting of the video.

When the Factory Mode is turned off, all TV functions are returned to normal. The simbols at the top of the channel menu icons is removed indicating that the Factory Mode is off. There are 4 ways to turn off the Factory Mode:

1. Change Installer’s Menu Item “00 F Mode” to 0.

2. Run Auto Program.

3. Use the Clock Set feature to set the time.

4. Use Factory off IR code.

Notes:

• Video Preference Settings Inhibited: In the Video

Menu, the Custom Video Preference settings are inhibited while the Factory Mode is on and will NOT be stored in EEPROM. (This allows the factory to temporarily change the settings and not store them permanently .)

01 Preset Px: Used to store the customer menu adjust-

ments in the nonvolatile memory of the EAROM. Settings for Contrast, Brightness, Color and Tint are stored in this manner. 0 is Custom and 1 is Preset.

02 Preset Ax: Saves your custom audio settings

(Bass,treble,balance,audio mode,sound rite,front surr,speaker) in nonvolatile memory (not affected by power loss). Memory status is indicated by a 1 for “custom settings already stored”, or 0 for “custom settings have not been stored.”

03 Vert Pos: Sets On Scree Display vertical position. Use

the ADJUST keys.

04 Horz Pos: Sets On Screen Display horizontal position.

Use the ADJUST keys.

05 Band/Afc: There are 8 possible settings for this op-

tion.

06 Ac on: Allows the TV to turn ON just by applying AC

power. Pressing the ON button is not necessary. This is desirable when the TV is plugged into a cable box or a power outlet controlled by a wall switch. Use adjust to select 0 or 1, where 0 is OFF and 1 is ON.

Note: When set to 1 (ON), the TV does not respond to

ON/OFF commands from either the remote or the control panel, and the SLEEP TIMER is also nonfunctional.

07 Feature Level: Set to 1 to see Zenith Code, when set

to 0 Private Codes are shown.

08 Trap: Turn On 3.58 MHz internal trap in Video Proces-

sor.

09 RF Band Pass Activates the Band Pass Filter for RF

(Antenna) input

1 0 RF BRT Set Black Level for RF input (Antenna) 11 Aux BRT Set Black Level for Auxiliar input (Video:

Composite & Y/C)

12 Yuv BRT Set Black Level for YUV input (Component

Video)

1 3Max Bright Set maximum internal Brightness Register 1 4Max Contrast Set maximum internal Contrast Register 15 Vert Size: Vertical amplitude adjustment Variable in

factory menu. Range: 0-127, Initial value: 63.

16 Horz Size: Horizontal amplitude adjustment Variable

in factory menu. Range: 0-63, Initial value: 31.

17 Vert Phase: Adjust the Vertical Phase, screen up -

down. Range 0-5. Initial value: 0

18 Horz Phase: Adjust the Horizontal Phase, screen left-

right. Range: 0-31. Initial value: 32

19 Audio Level: Adjust the composite audio level aoutput

of the video processor.

20 RF AGC: Adjust the AGC delay for maximum gain with

a reference level of 0 dBmV.

2-1 FA - INSTALLERS MENU

FACTORY MENU (continued)

21 Horz AFC: Set the automatic horizontal frecuency con-

trol on, should be 1.

22 WPL: Activates White Peak Limiter 23 Tint Offset: Set the Tint offset 24Red Cut: Set the Red Cutoff of Low Luminance White

Balance adjustment

25 Green Cut: Set the Green Cutoff of Low Luminance

White Balance adjustment

2 6Blue Cut: Set the Blue Cutoff of Low Luminance White

Balance adjustment

27 Green Gain: Set the Green Gain of High Luminance

White Balance adjustment

2 8Blue Gain: Set the Blue Gain of High Luminance White

Balance adjustment

29Air AFT: Set the AFT when watching air signal. 30 A ATT: Adjust the composite input level to the audio

decoder to have the standard input level.

31 A VCO: Adjust Stereo VCO and SAP VCO free running

frequency.

32 A Filter: Adjust the filter for Stereo, SAP and DBX.

45 H EHT Comp: Horizontal Extremely High Tension

Compesation. Range 0-7. Initial value: 4

46 V EHT Comp: Vertical Extremely High Tension

Compesation. Range 0-7. Initial value: 6

47DC Rest Set the DC Restoration level 48BLK Stretch Set the Black Stretch start point 4 9ABL Gain Set the Automatic Black Level Gain 50SVM GAIN Adjust the Scan Velocity Modulator gain 51SVM PH Adjust the Scan Velocity Modulator Phase 5 2ACB SW Activates Automatic Control Beam 53 SHARP PF Sharpness peak frequency selection: 0 to

3.2 MHz and 1 to 4.0 MHz

54CORING Activates the enhancement of Sharpness from

1 to 2 MHz

55B-Y ATT Set the attenuation level of Cb of YUV signal 56R-Y ATT Set the attenuation level of Cr of YUV signal 57AUTO FLESH Activates the Flesh tone control 5 8 ABL START POINT Set the Automati c Black Level Start

Point

33 A Spectral: Adjust high frequency stereo separation

(3KHz.)

34 Wide Band: Adjust low frequency stereo separation

(300Hz.)

35 Max Blk. Hrs: Adjust the maximun number of hours

the TV can remain Blocked (even 99 hours)

3 6RGB Contrast: Set OSD Contrast level 37SUB Contrast: Set internal Sub-Contrast Register 38 EW Correct: East- West Correction. Range 0-63, Ini-

tial value:26

39 EW T op-Corr East-West Corner Corr ection (top). Rang e

0-31, Initial value: 14

40 EW Bott-Corr: East-West Corner Correction (bottom).

Range 0-31, Initial value: 23

41 EW Trap-Corr: East-West Trapezium Correction.Range

0-63. Initial value 30. Range 0-31, Initial value: 23

42 V Centering: Vertical Centering. Range 0-63. Initial

value: 30

43 V Linearity: Vertical Linearity. Range 0-15. Initial

value: 12

59 Y GAMMA Set the non-linear Gamma curve for Lumi-

nance signal

6 0ACB PULSE P Set Automatic Control Beam Start Point 61SCREEN Not used 6 2AKB SETUP Mute the RGB Cathodes 63 AUX BAND PASS Activates the Band Pass Filter for

Auxiliar (Composite, Y/C, YUV) input

64 CD MATRIX Set the relative phase and amplitude of

Color response to demodulate de Chroma

65YCbCr Select the Demodulation System for Component

Video YUV or YCbCr

6 6C GAMMA Switch the Color Gamma

44 V S-Corr: Vertical S-Correction. Range 0-15. Initial

value: 11

FA - MENUS 2-2

SERVICING

LARGE SIGNAL

POWER SUPPL Y

The FA is a COLD chassis of a single sided circuit board, developed for a 27”. The power supply section features four IC’s for voltages sources. The FA chassis has the capability to meet the Energy Star requirement for a low power consumption on stand-by mode.

·9Volts, 1Amp ON/OFF Switch Regulator, 221-01460-07

·5Volts, 1Amp ON/OFF Switch Regulator, 221-01460-03

·5Volts, 0.150 Amp Switch Linear Regulator, 0IKE780500P

·Main regulator for Horizontal Deflection (B+), +15V, Switch mode regulator 223-00061-01.

·Error amplifier 221-00265-03A.

+33VSW

+15VSB@100mA

HORIZONTAL

DRIVE

+5VSW@ 100mA

+33VSW@ 15mA

TUNER

SWITCH MODE REGULA TOR

The FA chassis employs a switching power supply, quasiresonant topology type. The AC line is supplied thru the bridge rectifier BRX3400 and CX3410 circuit through the fuse FX3400 (5A @ 250 V fast blow), The AC operation range is between 90 Vrms to 135 Vrms (see TABLE

1.1) and a filter, consisting of LX3400, LX3401, CX3401, CX3403 and CX3408, which is employed before the rectifier circuit to reduce noise from the AC line and vice versa (EMI). The voltage output of the rectifier, VDC, is supplied to the Switch Mode Regulator Power Supply, and its output should be in this range [127 VDC to 352.5 VDC]. The SMPS consisting of ICX3612, ICX3701, ICX3702 and the chopper transformer TX3600. Through 100 KOHM resistor (Rst), RX3601 and CX3604 (Cst), which is derived the VCC from CX3410. These feed the pin 3 into the internal zener diode located within ICX3612.

-14VSW

205VSW

+35VSW

+12~14VSW

6.3Vrms

6.3Vrms@315mA

+130V@900mA

SWEEP

TRANSFORME

AC LINE

LINE

FILTER

RECTIFER

SECTION

MPI

SWITCHING

HYBRID IC

+5VSB@2mA

+12VSB@600mA

PROTECTION

+5VSB

OPTO

DEVICE

MICROPROCESSO

LSP

+21VL

+VAUD

+16VSB

+12VUP

SHUNT

REGULATOR

+5VSBF@27mA

+9VSW@ 120mA

B+

+9VSW

+5VSW

+5VSBF

PWR CTRL

POWER SUPPLY BLOCK SCHEMATIC

ABL

+5VSW@ 70mA

+VAUD@1400mA

PROCESS OR

ST AUDIO

VIDEO

+5VSW@ 80mA

COMB FILTE R

+9VSW@ 50mA

+9VSW@ 55mA

+9VSW@ 5mA

+9VSW@ 70mA

STEREO SWITCH & VOL -

-14VSW@

VERTICAL

DEFLECTION

SWITCHER CXA2089S

FILAMENT

+14VSW@

3-1 FA - SERVICING

SERVICING (continued)

PIN DESCRIPTION

PIN # DESCRIPTION FUNCTION

1 POWER MOSFET DRAIN To drive the chopper xfmr,capable of switching a max of 650V. 2GROUND (HOT) 3DRIVE (+VCC) Positive supply voltage, 32VDC 4 FEEDBACK (Vfb The output voltage error is applied to this pin. 5SYNCHRONY (Vs/s External sync signal & Soft star capacitor.

MOSFET Source connect ion.

At the same time this voltage is also applied to an internal comparator . So th e voltage of this power sour ce must be within a set range, between a 5VDC reference (Vref)

and a 32VDC zener diode (Vz).

This set range is verified through the UVLO (Under Voltage Lock Out) circuit of the Switch Power IC.

START UP

When the VCC reaches a upper threshold voltage (15 VDC) the comparator switches to enable the ICX3612

including all internal bias circuits, control circuits, PWM modulator & Power MOSFET. Due the demand of energy from Cst and Rst the VCC voltage starts to fall. Before to fall too low, a bootstrap winding on the power transformer (pins 13 & 16) reforces adequately the VCC power to keep the full system operation.

VOL TAGE SOURCES

There are Five secondary windings on the TX3600 and each has its own half wave rectifier. Consequently there are Five stand-by DC voltages: B+,

24V AUD, 21VL, 16VSB & 12VUP.

The first is used to source the horizontal sweep circuit, HOT (Horizontal Output Transistor). The second is used for audio. The third is exclusively for the LSP source, which is always on stand-by. The four is used for video low signal processing and The fifth is used for microcontroller.

The main microprocessor IC6000 and the EAROM memory IC6001 are supplied by a five volts stand-by source, +5V SB, which is derived through ICX3820 (0IKE78500P).

The +16 VSB and +12 VUP volts stand-by are protected by fuses FX3613 and FX3614 ( 4A @ 125V) Very Fast Acting, the +21VL and +24 VAUD volts stand-by are protected by fuses FX3611 and FX3612 ( 4A @ 125V) Slow Blow . B+ as m ent ion ed bef ore ar e pr otected by th e OCP circuit. So they do not need fuse.

The FA chassis can be turn it on with the keyboard on the front of the set or with the remote hand control. The microcontroller IC6000 receive a signal and it output a high, about 4.8V, on pin 32 which is called PWRCTL. This pin is connected to RX3832, RX3831 and RX3540; producing the +VAUD, +9VSW, +5VSW.

DEGAUSSING

The FA chassis employs a new method of degaussing, which is performed through software. The IC6000 generate a pulse of about 1 second, time fixed, on pin 43. This pin is set to high, about 4.8 VDC, through R3900,

4.7K 5% ¼watt. And it applies to Q3900, which drives the 12 VCD relay KX3900. So the degaussing is performed when the degauss coil is plugged to CN3T8 connector.

POWER SUPPL Y ALIGNMENT PROCEDURES

ELECTRICAL ADJUSTMENT

The FA chassis SMPS does not need any manual measurement. All the output voltages are regulated through ICX3702 (221-265-03A), error amplifier. The ICX3702 keeps the regulation using a reference voltage, through a voltage divider. The voltage divider is formed by two precision RX3706 and RX3704. The values of these resistors depends of the B+ output voltage.

NOTES:

·When servicing make sure to use a 120 VAC- 60Hz 25 Amp isolated source.

·Use a full white field on the video pattern generator.

FA - SERVICING 3-2

+ 39 hidden pages