Panasonic TC-20B10P User Manual

Order no. DCS - SET2000 - 001- MS

Service Manual

Color Television

TC-14B10P TC-20B10P

Chassis MX5Y

Specifications

TV MODEL

Power Source

Power consumption, Max (A)

Antenna Input

Colour System

Tuning System

110/220 V AC, 50/60 Hz

75Ω - VHF/UHF/CATV

NTSC/AUTO/PAL-M/PAL-N

TC-14B10P

automatic switch

80W

F.S.T

ENGLISHESPAÑOL

TC-20B10P

110/220 V AC, 50/60 Hz

automatic switch

90W

75Ω - VHF/UHF/CATV

NTSC/AUTO/PAL-M/PAL-N

F.S.T

Channels Receiving

Picture Tube (Measured Diagonally)

Audio Output

AV Input

Dimensions (W x H x D)

Weight

Remote Control Transmiter:

Power Source 3V (2 R6 batteries) Infrared Length 9500 A (Angstron) Number of Buttons 27 buttons Dimensions (W x H x D) (51 x 28 x 150) mm Wight 55g

Design and specifications are subject to change without notice

2 to 13 (VHF)

14 to 69 (UHF)

1 to 125 (CATV)

3W max (RMS)

1 (front) - 1 (rear)

370 x 351 x 366 mm

Panasonic

34 cm

9,6 kg

2 to 13 (VHF)

14 to 69 (UHF)

1 to 125 (CATV)

48 cm

3W max (RMS)

1 (front) - 1 (rear)

502 x 455 x 471 mm

17 kg

Provided accessories

1 Remote Control Transmiter

1 Balum 300Ω / 75Ω (Balum)

2 R6 size batteries 1,5V (ABNT/IEC)

1 Internal antenna (only for 14 models)

Important Safety Notice

Special components are used in this television set which are important for safety. These parts are identified on the schematic diagram by the symbol . It is essential that these critical parts are replaced whit the manufacturers specified replacement parts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design whitout manufacturers permission.

TABLE OF CONTENTS

OPERATION GUIDE ............................................................................. 03

SERVICE ADJUSTMENTS AND CALIBRATIONS

HOW TO OPERATE THE DAC CONTROLS ..................................... 06

HOW TO ENTER THE SERVICEMAN MODE ..................................... 06

HOW TO EXIT THE SERVICEMAN MODE ......................................... 06

DAC DIRECT TABLE ............................................................................ 07

MEMORY - DIRECT ACCESS METHOD ............................................. 07

EEPROM - MEMORY MAP .................................................................. 07

ELECTRICAL INSPECTION .................................................................. 07

INSPECTION OF THE DEFLECTION CIRCUITS ................................ 07

CUT OFF - PRE ADJUSTMENTS ........................................................ 08

CALIBRATION OF VIDEO IF ................................................................ 08

AFT ADJUSTMENTS ............................................................................. 09

AGC-RF ADJUSTMENTS ...................................................................... 09

NOISE LEVEL ADJUSTMENTS ............................................................ 09

VIDEO OUT ADJUSTMENTS ............................................................... 10

SUB-CONTRAST ADJUSTMENTS ....................................................... 10

COLOUR SATURATION ADJUSTMENTS .......................................... 10

SHARPNESS ADJUSTMENTS ............................................................. 10

SHUT DOWN SYSTEM COFIRMATION .............................................. 10

HORIZONTAL WIDTH AND CENTERING ADJUSTMENTS .............. 11

VERTICAL HEIGHT AND CENTERING ADJUSTMENTS ................... 11

WHITE BALANCE PRE ADJUSTMENTS ........................................... 11

CRT CUT OFF ADJUSTMENTS ........................................................... 11

FOCUS ADJUSTMENTS ..................................................................... 12

FRONT PANEL CHECKING ................................................................. 12

AV IN TERMINALS CHECKING ........................................................... 12

AUTOMATIC AND MANUAL MEMORIZATION .................................... 13

TUNE CHECKING ................................................................................. 13

AUDIO CHECKING ................................................................................ 13

PURITY AND CONVERGENCE ADJUSTMENTS .............................. 14

SCHEMATICS DIAGRAMS ................................................................... 15

IC601 BLOCK DIAGRAM / PINS AND FUNCTIONS ........................... 16

WAVE FORMS ...................................................................................... 17

CABINET PARTS LOCATION ............................................................... 19

CABINET REPLACEMENT PARTS LIST ............................................. 20

ELECTRICAL REPLACEMENT PARTS LIST ...................................... 21

General Guidelines

An Isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the Receiver from being damaged by accidental shorting that may occur during servicing. When servicing, observe the original lead dress, especially in the high voltage circuit. Replace all damaged parts (also parts that show signs of overheating.) Always Replace Protective Devices, such as fishpaper, isolation resistors and capacitors, and shields after servicing the Receiver. Use only manufacturers recommended rating for fuses, circuit breakers, etc. High potentials are present when this Receiver is operating. Operation of the Receiver without the rear cover introduces danger from electrical shock. Servicing should not be performed by anyone who is not thoroughly familiar with the necessary precautions when servicing high-voltage equipment. Extreme care should be practiced when Handling the Picture Tube. Rough handling may cause it to implode due to atmospheric pressure (14.7 lbs per sq. in). Do not sick or scratch the glass or subject it to any undue pressure. When handling, use safety goggles and heavy gloves for protection. Discharge the picture tube by shorting the anode to chassis ground (not to the cabinet or to other mounting hardware). When discharging, connect cold ground (i.e. dag ground lead) to the anode with a well insulated wire or use a grounding probe. Avoid prolonged exposure at close range to unshielded areas of the picture tube to prevent exposure to X-ray radiation. The Test Picture Tube used for servicing the chassis at the bench should incorporate safety glass and magnetic shielding. The safety glass provides shieldinf for the tube viewing area against X-ray radiation as well as implosion. The magnetic shield limits X-ray radiation around the bell of the picture tube in addition to restricting magnetic effects. When using a picture tube test jig for service, ensure that the jig is capable of handling 31kV without causing X-ray radiation. Before returning a serviced receiver to the owner, the service technician must thoroughly test the unit to ensure that is completely safe to operatore. Do not use a line isolation transformer when testing.

Warning !

It is essential that these critical parts are replaced with the manufacturers specified replacement parts to prevent X-ray radiation, shock, fire or other hazards.

WARNING !!

Esquema Elétrico do chassi MX5Y ................. (em anexo)

Conserve-o sempre junto deste manual.

- 2 -

HOW TO OPEN THE CABINET

Screw

Operation Guide TC-14B10P / TC-20B10P

ENGLISH

- 3 -

Operation Guide TC-14B10P / TC-20B10P

- 4 -

Operation Guide TC-14B10P / TC-20B10P

ENGLISH

- 5 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

HOW TO OPERATE THE DAC CONTROL MX5Y

FUNCTIONS ADJUSTMENTS

1- SERVICEMAN MODE

1.1- TO ENTER CHQ MODE (SERVICE):

Set the OFF TIMER to 30 using the remote control and adjust minimum volume at the TV panel. Press simultaneously RECALL at the remote control and VOL(-) at the tv panel. The white screen will appear on receiver. Press RECALL again and the letters CHQ will appear magenta with a blue background.

1.2- To alternate between CHQ modes, press 1 or 2

at the remote control (CHQ1 to CHQ5)

1.3- TO EXIT CHQ MODE (SERVICE):

Press N at the remote control, or just turn off the TV using the remote control.

CHQ1

1.1- Press3or 4 to alternate the existing options: from OP1 to OP6.

1.2- To change the data inside each sub-item press VOL(+) or VOL(_) (the letter will be red). To memorize the modifications press 0 (the letter will come back to green).

OP1 (Colour system)

This option alternates between colour systems that will be available within the TV set. OP1=0 auto/PAL-M/NTSC (mod. Binorma) OP2=1 auto/PAL-M/PAL-N/NTSC (mod. Trinorma) OP1=2 Pal-M (mod.Pal-M)

OP2 (Game Function) This option may turn the function GAME on/off.

OP3 (PANASONIC DEMO) This option may turn the function DEMO on/off.

OP4 (TELE-TEXT) - not available This option may turn the function TELE-TEXT on/off.

CHQ2

1.1- Press 3 or 4 to alternate between existing positions like the sequence below: To change between the data of each sub-item press VOL(+) or VOL(_), the letter will stay green. No need to memorize.

COLOUR ..........................USER

SUB-COLOUR .................CALIBRATION

TINT .................................USER

SUB-TINT ........................CALIBRATION

BRIGHT ........................... USER

SUB-BRIGHT .................. CALIBRATION

CONTRAST ..................... USER

SUB-CONTRAST ............ CALIBRATION

PURITY ............................USER

SUB-PURITY ...................CALIBRATION

CHQ3

1.1- Press 3 or 4 to alternate between the existing options, as sequence below: To change between the data in each sub-item press VOL(+) or VOL(_), the letter will stay green. No need to memorize.

HC ....................... HORIZONTAL CENTERING

VC ....................... VERTICAL CENTERING

V ALT .................. VERTICAL HEIGHT

CHQ4

AFT ..................... AFT CALIBRATION

VID................ VIDEO LEVEL CALIBRATION

RF..............AGC-RF CALIBRATION

CHQ5

1.1- Press 3or 4 to alternate between the existing options, as sequence below: To change between the data in each sub-item press VOL(+) or VOL(_), the letter will stay green. No need to memorize.

CHQ5  Options:

OP5 (SASO) - not available This option may turn the function SASO on/off.

OP6 (NOISE MUTE) - not available

This operation may turn the function NOISE MUTE on/off. Without the blue screen, it cuts off the noise when you are working on a channel without reception or very weak signal.

B-CUT...........BLUE LOW LIGHT CALIBRATION

G-CUT.......... GREEN LOW LIGHT CALIBRATION

R-CUT...........RED LOW LIGHT CALIBRATION

B-DR......... BLUE HIGHT LIGHT CALIBRATION

R-DR......... RED HIGH LIGHT CALIBRATION

SUB-BR........ SUB BRIGHT CALIBRATION

BRIGHT........ BRIGHT CALIBRATION

- 6 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

1.2- Press 5 at the remote control to make appear a white line for screen calibration. In order to make tHe line disappear press 5 again.

DAC DIRECT TABLE

CHQ1 CHQ2 CHQ3 CHQ4 CHQ5

OP1 SUB-COR HC AFT B-CUT OP2 COR VC VID G-CUT OP3 SUB-NITIDEZ V ALT RF R-CUT OP4 NITIDEZ --- B-DR OP5 SUB-CONTRAST R-DR OP6 CONTRAST SUB BR

--- SUB-BRIGHT BRIGHT

--- BRIGHT ---

--- SUB-MATIZ ---

--- MATIZ ---

---

MEMORY - DIRECT ACCESS METHOD

1.1- To obtain direct access to memory go to item CHQ1, press simultaneously VOL(_) at the TV set and mute at the remote control.

1.2- To alternate between memory positions press 3or 4.

1.3- To change the contents of each memory positions press VOL(+) or VOL(_), the letter will remain red. To memorize the changes press 0, the letter will go back to white.

1.4- To exit memory press 1 or 2 to alternate between the CHQs or press N to exit SERVICE MODE .

DATA MEMORY ON THE SCREEN

ELECTRICAL INSPECTION

1- EQUIPMENTS REQUIRED

1.1- High voltage meter, range to 30kv (eletrostatic or resistive)

1.2- Voltmeter, range 30VDC, 150 VDC and 300VAC

1.3- Voltmeter RMS

1.4- DY,CY,CRT

2- PREPARATION

2.1- Position controls on the following positions:

NORMAL IMAGE....ADJUSTED

VOLUME.......... MINIMUM

TV/VIDEO............ TV

POT SCREEN................CENTER

POT FOCUS...........BEST POINT ( VISUAL)

3- VOLTAGE INSPECTION

3.1- Adjust AC input voltage to 110V.

3.2- Turn on the S801 switch.

3.3- Apply a CROSS HATCH pattern.

3.4- Adjust controls SUB BRIGHT ( SUB BR) in CHQ5 and SCREEN to obtain corrente de feixe zero.

3.5- Verify the voltage on the points below:

VOLTAGE

90V ± 2,0V

190V ± 15V E33 - PIN 1 300V

22V ± 2,0V D850 (K) 30V 44V ± 2,5V D852 (K) 50V

9V ± 1V TPE9 30V 5V ± 1V TPE10 30V

6,3 V

± 0,24V

RMS

180V ± 15V E33 - PINO 1 300V

TEST POINT METER

C823 (+) 300V

Y33 - PIN 4

For 14 models only

30V

RMS

ENGLISH

EEPROM MEMORY MAP

3.6- Position SCREEN and SUB BRIGHT ( SUB BR) to a level where image is visible.

INSPECTION OF THE DEFLECTION

CIRCUITS AND PRE-ADJUSTMENTS

1- REQUIRED EQUIPMENTS.

1.1- High voltage meter, range up to 30Kv (eletrostatic or resitor).

2- PROCEDURES.

2.1- Apply a PHILIPS pattern.

2.2- Select VERTICAL HEIGHT (V ALT) in CHQ3.

2.3- Adjust the heigth to obtain a correct image.

2.4- Apply a CROSS HATCH pattern.

2.5- Adjust BRIGHT, SUB BR, in CHQ5, SCREEN minimum to obtain current=0

2.6- Measure high voltage with the voltmeter and verify if is within the limits below:

METER

ELETROSTÁTICO RESISTIVO

- 7 -

20 INCHES 14 INCHES

26,5 + 1,0 _ 1,5KV 24,5 + 1,0 _ 1,5KV 26,0 + 1,0 _ 1,5KV 24,0 + 1,0 _ 1,5KV

TC-14B10P / TC-20B10PService Adjustments and Calibrations

2.7- Apply a PHILIPS pattern.

2.8- Adjust BRIGHT, SUB BR, in CHQ5, SCREEN to obtain normal image.

2.9- Check if horizontal width is normal

2.10- Select SUB BR in CHQ5 and check if BRIGHT is controlled by varying SUB BR in CHQ5.

2.11- Select HORIZONTAL CENTERING (HC) in CHQ3 (Service Mode) and adjust convergence.

2.12- Select VERTICAL CENTERING (VC) in CHQ3 (Service Mode) and adjust convergence.

3- PRÉ AJUSTE DO AGC RF.

3.1- Apply a PHILIPS pattern.

3.2- Adjust the signal level to 65±2bB (75Ω open).

3.3- Select RF AGC in CHQ4 Service Mode and increase

it pressing VOL(+). Verify if snow appear when the RF AGC register is increased. Then decrease it slowly by using VOL(_) until the snow has disappeared.

CUT OFF - PRE ADJUSTMENTS

1- REQUIRED EQUIPMENTS.

1.1- Oscilloscope.

1.2- Connect oscilloscope between TPY1 (Q352-C) and

ground.

1.3- Position controls/adjust following the information

below:

R HIGH LIGHT (R-DR)..................40H

B HIGH LIGHT (B-DR)...................40H

R LOW LIGHT (R-CUT).................000H

B LOW LIGHT (B-CUT).................000H

G LOW LIGHT (G-CUT)................ 125H

COR...............................................MINIMUM

CONTRASTE................................ MAXIMUM

SCREEN........................................MINIMUM

1.4- Apply a PHILIPS pattern.

1.5- Press 5 at the remote control to obtain a simple

horizontal line

1.6- Adjust G-CUT to obtain a reading at TPY1, as figure

below.(*)

1- SOUND INSPECTION

1.1- Verify if sound varies correctly pressing VOL(+) or VOL(_).

1.2- Verify if tone is adjusted using the TONEcontrol at the SOUND Menu.

2- INSPECTION OF COLOUR CONTROL

2.1- Apply a PHILIPS pattern.

2.2- Select Pic. Menu DYNAMIC, and adjust NORMAL IMAGE using the remote control.

2.3- To access the function NORMAL IMAGE press MAIN MENU and next press the < or > navigation keys to select the function IMAGE. Press the   navigation keys to enter menu. Press the N key at the remote control to activate function NORMAL IMAGE.

2.4- Verify if saturation is normal and sufficcient.

2.5- Confirm the variation of the colour phase acting at the TINT control, receiving NTSC pattern.

3- OTHER INSPECTIONS.

3.1- Tune the VHF, UHF and CATV channels and check if there is good reception.

3.2- Press the key TV/VIDEO and verify ON SCREEN.

3.3- Return to the TV Mode.

CALIBRATION OF VIDEO IF

1- REQUIRED EQUIPMENT

1.1- Monitor

1.2- VIF generator

1.3- VIF detector

1.4- Power source of 9,0 ±0,1V and 4,0 ±0,1V

1.5- Bias box to AGC

1.6- Resistor Jumper of 1KΩ

CONEXIONS

(*) 20 inch 160 ± 2Vo-p

(*) 14 inch 140 ± 2Vo-p

1.7- Adjust SCREEN until a first line appears at the screen, and dont change it after this.

1.8- Adjust the other DACs that match the other two colours (R-CUT, B-CUT) until it turns the line white.

1.9- Exit to Normal Mode pressing NORMAL at the remote control.

- 8 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

CALIBRATION OF VIDEO IF ( continuing)

1- PREPARATION

2.1- Connect the VIF generator positive output cable to TPE33 and the negative to ground.

2.2- Connect the VIF detector positive output cable to TPE13 and negative to ground.

2.3- Connect the +9V power source positive to pin 3 of IC851 and negative to ground.

2.4- Connect the +4V power source positive in series with 1KΩ resistor to pin 63 of IC601 and negative to ground.

2.5- Connect the polarization of AGC with positive to TPE21 (IF AGC) and negative to the ground.

2.6- Enter Serviceman Mode.

2- ADJUSTMENTS

3.1- Calibrate monitor to 200mVp-p

3.2- Decrease the VIF generator output to minimum signal.

3.3- First, turn on the instruments and after that, the power sources.

3.4- Adjust bias AGC to obtain maximum gain.

3.5- Adjust the VIF generator output to obtain 200mVp-p at the monitor.

3.6- Increase 20dB to VIF generator output and adjust the Bias AGC to obtain 200mVp-p at the monitor

3.7- Confirm that the level of CC (42,17 MHz) and PC ( 45,75 MHz) are within the especificated below.

ZERO BEAT

↓

42,75

200m Vp-p

CC 42,17

45 ± 15%

45,00

PC 45,75

45 ± 15%

3- ADJUSTMENTS

3.1- Adjust AFT using coil L167 until the voltage below (*) is obtained at TPE29. (*) 4,0±1,0V (after 10 seconds ON) (*) 4.5±1,0V (after heating)

3.2- Vary the frequency of CW oscillator between ±100KHz and verify if tension variation at the multimeter is higher than ±1,2V

AGC-RF ADJUSTMENTS

ENGLISH

1- REQUIRED EQUIPMENT

1.1- Digital Multimeter

1.2- Attenuator

2- PREPARATION

2.1- Tune a COLORBAR patten.

2.2- Adjust the input signal level to 64±2dB ( 75Ω open).

2.3- Connect Digital multimeter between TPE23 and ground

3- ADJUSTMENTS

3.1- Select DAC AGC RF(RF) CHQ4 (Service Mode)

3.2- Adjust the DAC using the keys VOL(+) and VOL(_) until ±6,2V at TPE23.

NOISE LEVEL ADJUSTMENTS

1- REQUIRED EQUIPMENTS

1.1- Oscilloscope

1.2- 7KHz filter

41,65

39,75

41,25

47,25

AFT ADJUSTMENTS

1- REQUIRED EQUIPMENTS

1.1- Oscilator CW 45,75 MHz

1.2- VIF detector

1.3- Digital multimeter

1.4- Short Jumper

2- PREPARATION

2.1- Disconnect the signal from the antenna terminal

2.2- Connect the multimeter between TPE29 and ground

2.3- Connect the CW oscilator using VIF detector between TPE33 and ground

2.4- Adjust the CW oscilator output to 90+-5dBu (75Ω open).

2.5- Position the DAC AFT in 80H.

Oscilloscope

2- PREPARATION

2.1- Tune a COLORBAR patten (no sound modulation).

2.2- Position tone control to center

2.3- Position VOLUME control to maximum.

2.4- Connect Oscilloscope to speakers terminals.

3- VERIFICATION

3.1- The maximum amplitude of the noise signal should be less than 1,5Vp-p.

3.2- When it is higher than 1,5Vp-p, activate 7KHz filter at the speakers terminals and verify if noise level is less than 0,5Vp-p.

1,5Vp-p

- 9 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

VIDEO OUT ADJUSTMENT

1- REQUIRED EQUIPMENT

1.1- Oscilloscope

1.2- Attenuator

2- PREPARATION

2.1- Apply a COLORBAR patten.

2.2- Adjust the input signal level to 75dB (75Ω open).

2.3- Connect the test tip of oscilloscope to TPE11

3- ADJUSTMENTS

3.1- Select DAC VIDEO (VID) CHQ4 (Service Mode).

3.2- Adjust the video signal level to 1,0±0,05Vo-p using the keys VOL(+) and VOL(_).

1,0Vo-p

SUB-CONTRAST ADJUSTMENTS

1- REQUIRED EQUIPMENT

1.1- Oscilloscope

1.2- Jumper

1.3- Attenuator

COLOUR-SATURATION ADJUSTMENT

1- REQUIRED EQUIPMENT

1.1- Oscilloscope

1.2- Jumper

2- PREPARATION

2.1- Tune a COLORBAR patten.

2.2- Adjust the input signal level to 75dB (75Ω Open).

2.3- Confirm that the Picture Menu is DYNAMIC

2.4- Confirm that channel colour is NORMAL

2.5- Confirm that temperature of colour is NORMAL

2.6- Connect oscilloscope between TPE27 and ground

2.7- Connect the jumper between TPE3 and ground

2.8- Position controls at the following positions:

G LOW LIGHT (G-CUT)25H

BRIGHT.......NORMAL OR CENTER

CONTRAST.... NORMAL OR MAX.

COLOUR NORMAL OR CENTER

3- ADJUSTMENTS

3.1- Select DAC SUB BRIGHT at CHQ2.

3.2- Adjust SUB BRIGHT to make the pedestal level remain 2,2±0,1Vp-p and confirm that there is no deformation of waveform.

3.3- Select DAC SUB-COLOUR at CHQ2.

3.4- Adjust SUB- COLOUR level to 2,5±0,1Vp-p at TPE27, as shown on figure below:

2- PREPARATION

2.1- Tune a COLORBAR patten.

2.2- Adjust the input signal level to 75dB (75Ω open )

2.3- Connect the jumper between TPE3 and ground

2.4- Connect the oscilloscope between TPE27 and ground.

2.5- Confirm if Picture Menu is DYNAMIC.

2.6- Position the controls at the following positions: G LOW LIGHT (G-CUT)...125H BRIGHT..CENTER CONTRASTNORMAL OR MAX. COLOUR.MINIMUM

3- CALIBRATION

3.1- Select DAC SUB BRIGHT (SUB BR) CHQ2.

3.2- Adjust SUB BR until you have a level of 2,2±0,1Vp-p and confirm if there is no deformation of waveform.

3.3- Select DAC SUB-CONTRAST, CHQ2.

3.4- Adjust SUB-CONTRAST level to 2,9±0,1Vp-p at TPE27, as figure below.

Ajusted by Sub-Contraste

← 2,9 ± 0,1 Vp-p

Pedestal level

Ajusted by Sub-Bright

GND

← 2,2 ± 0,1 Vp-p

Adjusted by Sub-Color

← 2,5±0,1 Vp-p

Pedestal level

Adjusted by Sub-Bright

GND

← 2,2±0,1 Vp-p

SHARPNESS ADJUSTMENT

1- PREPARATION

1.1- Select sharpness control using Menu IMAGE

1.2- Adjust the control SHARPNESS to center.

2- ADJUSTMENTS

2.1- Select DAC SUB-SHARPNESS at CHQ2.

2.2- Adjust SUB SHARPNESS to(*) using the remote control. (*)14=17H (*)20=1BH

2.3- Press key N to exit SERVICE mode.

SHUT DOWN SYSTEM CONFIRMATION

1- REQUIRED EQUIPMENT

1.1- DC power source

1.2- Voltmeter

- 10 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

2- PREPARATION

2.1- Apply a CROSS HATCH pattern.

2.2- Adjust the controls BRIGHT and CONTRAST until current turns to zero.

3- CONFIRMATION

3.1- Connect the DC voltmeter to cathode of D591 and confirm that voltage is lower than level(*)A.

3.2- Adjust the DC power source to level(*)B and confirm that SHUTDOWN is not acting.

3.3- Adjust the DC power source to level(*)C and confirm that SHUTDOWN is not acting.

LEVELS 14 (V) 20 (V)

(*)A (*)B

(*)C

21,60 22,30 23,60 24,10 25,60 26,10

HORIZONTAL WIDTH AND CENTERING

ADJUSTMENTS

1- ADJUSTMENT OF HORIZONTAL CENTERING

1.1- Position the control BRIGHT to minimum.

1.2- Tune to PHILIPS standards.

1.3- Select the DAC of HORIZONTAL CENTERING (HC) at CHQ3 Service Mode.

1.4- Adjust the HORIZONTAL CENTERING using the keys VOL(+) OR VOL(-).

2- VERIFICATION OF HORIZONTAL WIDTH

2.1- Verify if horizontal width, is within the specifications below:

VERTICAL HEIGHT AND CENTERING

ADJUSTMENTS

1- ADJUSTMENTS.

1.1- Tune a Philips pattern.

1.2- Select the DAC of VERTICAL CENTERING at CHQ3 Service Mode.

1.3- Adjust the vertical placement pressing the VOL(+) or VOL(_) keys until the image is centered. Suggestion: the center line of CRT should coincide with the centerline of PHILIPS pattern).

1.4- Select the DAC VERTICAL ALTITUDE (V ALT) AT CHQ3 at SERVICE mode.

1.5- Adjust the correct altitude pressing VOL(+) or VOL(_) keys

WHITE BALANCE PRE ADJUSTMENT AND

CRT CUT OFF ADJUSTMENT

IMPORTANT: This adjustment should be done after 15

minutes heating time.

1- REQUIRED INSTRUMENTS

1.1- Oscilloscope

2- PREPARATION.

2.1- Connect oscilloscope between TPY1 and ground.

2.2- Apply a PHILIPS pattern.

2.3- Confirm if Picture Menu is DYNAMIC

2.4- Confirm if Channel Color is NORMAL

2.5- Confirm Colour Temperature in NORMAL

2.6- Enter Service Mode at CHQ5.

2.7- Position controls at the following positions:

R HIGH LIGHT(R-DR).........40H

B HIGH LIGHT(B-DR)......... 4OH

R LOW LIGHT (R-CUT)..........000H

B LOW LIGHT(B-CUT)........000H

GLOW LIGHT(G-CUT)........125H

SCREEN........MINIMUM

ENGLISH

DIÂMETRO A MODELO

20 polegadas290 ± 5 mm 14 polegadas200 ± 5 mm

3- ADJUSTMENTS

3.1- Press 5 at the remote control to obtain a simple horizontal line.

3.2- Confirm that the Pedestal level value at pin TPE27 is 2,2±0,1Vp-p.

3.3- Adjust G-CUT to obtain (*A) at TPY1, as figure below:

(*A) 14 140±2Vp-p (*A) 20 160±2Vp-p

0 V

3.4- Adjust SCREEN until a first line appears at the screen, and dont change it after this.

3.5- Adjust the other DACs that correspond to the other two colours (R-CUT,B-CUT) until line turns white.

3.6- Exit to normal mode pressing the key NORMAL at the remote control.

- 11 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

FOCUS ADJUSTMENT

1- PREPARATION

1.1- Apply a MONOSCOPE or PHILIPS pattern.

1.2- Confirm that Picture Menu is NORMAL DINAMIC

1.3- Adjust the controls to the following positions:

CONTRAST.....MAXIMUM

BRIGHT........... NORMAL

IMPORTANT:SUB BRIGHT adjustment should

have been done before.

2- ADJUSTMENTS

2.1- Adjust the FOCUS meter (FBT) until the best focalization of image is obtained.

FRONT PANEL CHECKING

1- TV/AV VERIFICATION

1.1- Apply a PHILIPS pattern.

1.2- Press TV/AV button and verify if AV shows up ON SCREEN

2- VOLUME VERIFICATION

2.1- Press VOL(+) or VOL(_) button and watch for a slight variation.

2.2- Confirm that indication of volume position change slightly on ON SCREEN.

3- CONFIRMING THE FUNCTION TURN ON/OFF OF

AC SWITCH

3.1- Turn OFF and turn ON the AC switch. Confirm that previous memory position is saved. (it shows PHILIPS pattern).

3.2- Confirm that volume is minimum and the other controls are on the final adjustment condition.

3.3- Verify if led is on.

FINAL POSITION OF CONTROLS

VOLUME.........MINIMUM

COLOUR................CENTER

BRIGHT.......... CENTER

CONTRAST........MAXIMUM

6- VERIFICATION OF THE FUNC KEY

6.1- Press the FUNC key at the front panel and verify if

the following sequence appears: AUTOMATIC TUNING SKIPP CHANNEL OFF ANTENNA TV

7- HOTEL MODE CONFIRMATION

7.1- Adjust the volume to 15.

7.2- Enter HOTEL MODE. To enter, set OFF TIMER to 30 and press simultaneously CH(+) at the front panel and RECALL at the remote control.

7.3- Confirm that the MAIN MENU and OFF TIMER are not operating.

7.4- Confirm that the maximum volume possible is 15

7.5- Exit HOTEL MODE. To exit, press simultaneously VOL(_) at the front panel and OFF TIMER at the remote control.

7.6- Confirm that OFF TIMER operates normally.

AV IN TERMINALS CHECKING

1- REQUIRED INSTRUMENTS

1.1- TV pattern signal generator

2- PREPARATION

2.1- The colour adjustment should already been done.

2.1- Set the TV/AV switch to AV position.

3- CONFIRMATION

3.1- Confirm that AV appears on ON SCREEN

3.2- Confirm that image and sound disappears

3.3- Connect the pattern signal generator to the rear AV input terminal and confirm that noise and image appears.

3.4- Connect the other source to the front AV input terminal and confirm that the pattern signal connected to the rear AV input terminal was substituted by the signal of front AV input terminal.

3.5- Set the TV/AV switch to TV position.

4- CHECKING THE MICROPROCESSOR

4.1- Press the CH(+) or CH(_) button at the remote control and confirm that ON SCREEN of the number of channels previously tuned, up and down.

5- STAND BY OPERATION

5.1- Turn the TV on using the ON/OFF switch.

5.2- Press the ON/OFF button at the remote control to enter in the STAND BY mode.

5.3- Disconnect and reconnect the power supply cable.

5.4- Confirm if TV set is at STAND BY.

5.5- Press the CH(+) or CH(_) button at the remote control and verify if the TV turns on.

- 12 -

TC-14B10P / TC-20B10PService Adjustments and Calibrations

AUTOMATIC AND MANUAL MEMORIZATION

1- VERIFICATION OF AUTOMATIC MEMORIZATION.

1.1- Adjust the input pattern signal level to 40 dB

1.2- Press FUNC at the front panel and it will appear an indication of AUTOMATIC SINTONY. Press VOL(+) at the front panel to begin automatic memorization.

1.3- Verify the following items:

-Channel changes

-Automatic sintony

1.4- When memorization process is over, turn off the TV using ON/OFF button.

1.5- Turn on the TV again using ON/OFF button and verify the memorized channels using CH(+) or CH(_).

2- VERIFICATION OF MANUAL MEMORIZATION.

2.1- Press FUNC at front panel until select SKIP channel.

2.2- To add a channel press VOL(+) or VOL(_) until OFF  appears.

2.3- To take one channel out press VOL(+) or VOL(_) at the set until ON appears.

2.4- To change channels press the CH(+) or CH(_).

AUDIO CHECKING

1- CONFIRMING TONE AND VOLUME

1.1- Apply a pattern signal with sound.

1.2- Confirm that high frequency sound is altered when tone level is varied at Sound menu.

1.3- Press the VOL(+) or VOL(_) at the remote control and notice a slight variation.

2- CONFIRMATION OF NOISE MUTE AND

BLUE SCREEN

2.1- Apply a PHILIPS pattern.

2.2- Turn on BLUE-BACK at the FUNC MENU. Confirm if audio output is normal.

2.3- Eliminate antenna signal or reduce the signal strenght. Confirm if blue screen appears and audio is cut off.

2.4- Turn off BLUE-BACK at the FUNC MENU. Verify if blue screen doesnt appear and if sound exist (noise)

2.5- Turn BLUE-BACK again at FUNC MENU.

TUNE CHECKING

1- PREPARATION

1.1- Turn on the TV set using On/OFF switch.

2- VERIFICATION

2.1- Turn on signal at the TV set.

2.2- Press any existing channel number using the remote control and verify if channel is selected.

2.3- Verify at bands VHF LOW, VHF HIGH, UHF and CATV.

- 13 -

+ 30 hidden pages