Panasonic TX-21FG20R Bedienungsanleitung

Power Source : AC AUTO 110-240V, 50/60 Hz

Power Consumption : 83W

Aerial Impedance : 75Ωunbalanced

Coaxial type

Receiving System : 17 Systems

Receiving Channels :

VHF 1-11 PAL B (Australia & N.Zealand)

1-12 PAL/SECAM D

1-12 NTSC M JAPAN

2-12 PAL/SECAM B, G

2-13 NTSC M U.S.A.

UHF 21-69 PAL G I/SECAM B, G, K1

28-69 PAL G (Australia)

13-56 PAL D

13-52 NTSC M JAPAN

14-69 NTSC NTSC M U.S.A.

CATV S1-S41 (Hyper)

Intermediate Frequency :

Video 38.0 MHz

Sound 31.5 MHz (D, K, K1)

32 MHz (I)

32.5 MHz (B, G)

33.5 MHz (M)

rights reserved. Unauthorized copying and

distribution is a violation of law.

TX-21FG20R

GP31 Chassis

Colour 33.57 MHz (PAL)

33.6 MHz (SECAM)

33.75 MHz (SECAM)

34.42 MHz (NTSC)

ideo / Terminals : AV1, 2

RAV In VideoIn1Vp-p75Ω

Audio In Approx. 400mVrms

Monitor Out Video Out 1 Vp-p 75Ω

Audio Out Approx. 400mVrms

High Voltage : 27.5kV±1.5

at zero beam current

Picture Tube : A51LXR195X

51cm (21 inches)

Measured diagonally,

90° deflection

Audio Output : 16.0W

Dimensions : Height : 473 mm

Width:648mm

Depth : 488 mm

Mass : 24 kg (Net Wt.)

Specifications are subject to change without notice.

Mass and dimensions shown are approximate.

Colour Television

Specifications

ORDER NO. MTV0501367C3

1 Safety Precautions 3

1.1. General Guide Lines 3

1.2. Leakage Current Cold Check 3

1.3. Leakage Current Hot Check (Fig. 1) 3

1.4. X-Radiation 3

1.5. GP31 Chassis Block Diagram 4

2 Service Hints 5

2.1. Service Position for E-Board 5

2.2. Factory Mode Adjustment 5

2.3. Adjustment for White Balance 6

2.4. Adjustment for CRT CUT OFF 6

2.5. Adjustment Procedure 7

2.6. PAL Colour 8

2.7. Adjustment 8

3 Conductor Views 12

4 Schematic Diagram 13

4.1. A Board 15

4.2. L Board 21

5 Parts Locations 24

6 Replacement Parts List 25

6.1. Replacement Parts List 26

CONTENTS

Page Page

TX-21FG20R

1 Safety Precautions

1.1. General Guide Lines

1. It is advisable to insert an isolation transformer in the AC supply before servicing this hot chassis.

2. When servicing, observe the original lead dress, especially the lead dress in the high voltage circuits. If a short circuit is found,

replace all parts which have been overheated or damaged by the short circuit.

3. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers, shields and isolation R-C

combinations, are properly installed.

4. When the receiver is not to be used for a long period of time, unplug the power cord from the AC cord outlet.

5. Potential, as high as 29.0kV is present when this receiver is in operation. Operation of the receiver without the rear cover

involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by anyone who is not

thoroughly familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the

picture tube to the receiver chassis before handling the tube. After servicing make the following leakage current checks to

prevent the customer from being exposed to shock hazards.

1.2. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the two prongs on the plug.

2. Turn on the receiver’s power switch.

Measure the resistance value, with an ohmmeter, between the jumper AC plug and each exposed metallic cabinet part on the

receiver, such as screw heads, aerials, connectors, control shafts, etc. When the exposed metallic part has a return path to the

chassis, the reading should be between 4 MΩand 20 MΩ. When the exposed metal does not have a return path to the chassis,

the reading must be infinite.

1.3. Leakage Current Hot Check (Fig. 1)

1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2. Check a 2 kΩnon-inductive resistor and an AC/DC current meter, in series with each exposed metallic part on the receiver in

turn and an earth such as a water pipe.

The current from any point should not exceed 0.7 mA peak AC or 2 mA DC. In the case of a measurement being outside of

these limits specified, there is a possibility of a shock hazard and the receiver should be repaired and rechecked before it is

returned to the customer.

Fig. 1

1.4. X-Radiation

Warning:

The potential sources of X-Radiation in TV set are the EHT section and the picture tube. When using a picture tube test jig for

service, ensure that jig is capable of handling 29.0kV without causing X-Radiation.

Note: It is important to use an accurate periodically calibrated high voltage meter.

1. Set the brightness to minimum.

2. Use the remocon to get into Service Mode.

3. Measure the EHT. The meter reading should indicate 27.5±1.5kV. If the meter indication is out of tolerance, immediate service

and correction is required to prevent the possibility of premature component failure.

4. To prevent the possibility X-Radiation, it is essential to use the specified picture tube, if service replacement becomes

necessary.

TX-21FG20R

1.5. GP31 Chassis Block Diagram

MONITOR

OUT

IC801

T801

IC880

STBY 5V

IC1201

3.3V

EEPROM

IC1103

V OUT

IC601

UOC

SAW

AV1

AV2

YUV1

H OUT

MSP

IC2101

AUDIO

AMP

IC2301A

SDA SCL

PRIMARY

LIFE CCT

QIF / AUDIO

DEEMP

AV1

AV2

AUDIO

AMP

IC2301

IC851

5V & 8V

Antenna

CRT

SAW SIF

SPEAKER

YUV

AMOUT SOUND

TRAP

AUDIO

SWITCH

IC3151

defl.

coil

TUNER

IFVO

CVBS1

CVBSO

CVBS2

CVBS3

SOUND MODULATION

MONO

STEREO

TX-21FG20R

2 Service Hints

2.1. Service Position for E-Board

1. Remove the back cover.

2. Stand the TV set as shown in Fig. 2.

3. Remove the A-Board from the TV set by pulling the main board out as shown in Figure 2.

Fig. 2

2.2. Factory Mode Adjustment

How to set : To set the Factory mode, press Volume 0 dac on the TV and Timer Setting 30 min. on

the remote control and press Volume (-) Down button on the TV together press recall on

the remote control.

CHK should appear on right of TV screen.

To move from CHK1 to CHK2 mode, etc. please follow below rotation :

To Set Self-Check : Press the Volume Down button on TV then press the Off Timer button on remote

control.

TX-21FG20R

2.3. Adjustment for White Balance

Preparation:

1. Receive the white balance pattern and aging should have been performed over 30 minutes.

2. Set the picture menu to DYNAMIC NORMAL.

3. Degausse the CRT face.

4. Fix the CRT colour analyzer receiver unit to CRT face.

Adjustment of Low Light.

1. Adjustment Sub Bright, so that Y = 6.3 ± 1.0 nit.

2. Adjustment R-CUT OFF, so that X = 0.235 ± 0.010 nit.

3. Adjustment G-CUT OFF, so that Y = 0.235 ± 0.010 nit.

Adjustment of High Light

1. Adjustment Sub Bright, so that Y = 270 nit.

2. Adjustment R-Drive, so that X = 0.265 ± 0.010 nit.

3. Adjustment B-Drive, so that Y = 0.265 ± 0.010 nit.

2.4. Adjustment for CRT CUT OFF

Preparation:

1. Connect the oscilloscope probe to TPL5.

2. Screen VR min.

3. Set the data Sub Bright, Bright.

4. In service Mode at “Bright” dac press [5] in factory mode to enter vertical line and adjust by volume down or up button.

5. Adjust “Screen VR” until 1-H Line appears.

TX-21FG20R

2.5.1. +B Voltage

Item / preparation

1. Operate the TV set.

2. Set control as follows :

Brightness ........... minimum

Contrast ............... minimum

Adjustment procedure

1. Confirm the DC voltage at the indicated test points, as

follows :

TPA 10 : 141.0 ± 1.5V

TPA 8 : 8 ± 1V

TPA 9 : 5 ± 1V

TPA 21 : 175 ± 15V

2.5.2. RF AGC

Item / preparation

1. Receive a colour bar signal at an RF level of 69 ± 1-2 dBU

with 75Ωloaded.

2. Connect digital multimeter to RF AGC at Tuner.

Adjustment procedure

1. Select “RF AGC” indication in CHK2, on Screen by remote

control at factory mode.

2. Set RF AGC by using remote control Volume (+) or Volume

(-) button until voltage AGC at Tuner reaches 2.3 ± 0.1V at

TPA 15 (Tuner point).

3. Increase RF signal strength by 2dB, confirm AGC at Tuner

voltage drop.

2.5.3. High Voltage

Item / preparation

1. Receive the crosshatch pattern.

2. Set to 0 Beam.

Screen VR .......... minimum

Contrast .............. minimum

Adjustment procedure

1. Connect a DC voltage meter to TPA 10 and confirm the +B

voltage is 141.0 ± 1.5V.

2. Connect a high frequency voltmeter to heater and confirm

that voltage reads 6.3 ± 0.24 (VRMS).

3. Normalize the brightness and contrast.

2.5.4. NTSC TINT COLOUR

Item / preparation

1. Connect oscilloscope probe to TPL1 (R OUT) with 10kΩ

series resistor.

2. Press Main Menu and set system to use AV-NTSC (3.58

MHz).

DYNAMIC ................... Normal

Channel CLR Set ..... STD

Adjustment procedure

1. Adjust Sub-Tint so that No. 2, 3 and 4 becomes level

waveform is similar to Fig. 3.

2. Confirm phase at Tint is changes more than ± 15 by Tint

control.

3. Confirm that colour level is maximum when colour DAC is

adjusted to maximum position.

Note: Use remote control only when adjusting user mode to

Sub-Tint.

2.5. Adjustment Procedure

TX-21FG20R

2.7. Adjustment

2.6. PAL Colour

1. Receive the PAL B/G studio colour bar pattern and adjust local frequency at the best tuned position.

2. Pic Menu: Dynamic Normal, Confirm Contrast - 100 DAC, Sub Contrast - 21 dac.

3. Channel colour set --------- STD

4. “CHK2” and press digit key “5” (AKB OFF) also confirm OSD become blue colour.

5. Set (A) to 2.1 ± 0.1V by BRT (CHK2) at measurement point TPL 2 Fig. 4.

1. Connect oscilloscope probe to TPL 2 (G OUT) with 10kΩseries resistor and adjust Contrast so that (B) as in Fig. 4 is 2.4 ±

0.05V.

2. Adjust “Sub Colour” so that waveform as in Fig. 4 (1) 2.5 ± 0.1V.

3. Connect oscilloscope probe to TPL 1 (R OUT) with 10kΩseries resistor and confirm waveform as in Fig. 5 is (2) 2.7 ± 0.4V.

4. Press digit key “5” (AKB ON) and confirm the OSD become white colour.

TX-21FG20R

Colour Purity

1. Set the Brightness and Contrast controls to their maximum

positions.

2. Operate the TV set for 60 minutes.

3. Fully degausse the picture tube by using an external

degaussing coil.

4. Apply a crosshatch pattern signal and adjust the static

convergence magnets to the approximately correct position.

5. Receive a black and white signal.

6. Set the control as follows:

Red................minimum

Green.............minimum

Blue...............minimum

Press the Shipping button on the remote control twice to

select CRT Adjustment Mode to select low light.

7. Loosen the clamp screw for the Deflection Yoke A in Fig. 10

and move the Deflection Yoke as close to the purity magnet

as possible.

8. Adjust the purity magnetic rings so that a vertical green field

is obtained at the centre of the screen.

Fig. 6

9. Slowly push the Deflection Yoke and set it where a uniform

green field is obtained.

Fig. 21

10. Re-adjust the Low Light controls to their correct settings

and make sure that a uniform white field is obtained.

11. Tighten the clamp screw A in Fig. 10.

Convergence

1. Apply a crosshatch pattern signal and Normalize Contrast

control to the maximum positions.

2. Adjust Brightness until the grey position of the crosshatch

pattern just becomes black.

3. Adjust the Red and Blue line at the centre of the screen by

rotating the R-B static.

Fig. 8

4. Adjust Red and Blue with Green line at centre of the screen

by rotating (RB)-G static convergence magnetic rings.

5. Lock convergence magnets with silicone sealer.

6. Remove the DY wedges and slightly tilt the Deflection Yoke

vertically and horizontally to obtain the good overall

convergence.

Fig. 9

7. Fix the Deflection Yoke by reinserting the DY wedges. Refer

to Fig. 10.

8. If purity error is found, repeat “Colour Purity” adjustment.

Before Colour Purity, Convergence and White Balance adjustment are attempted,

V. Height, H. Centre and Focus adjustments must be completed.

TX-21FG20R

Adjustment of CRT VRS

1. Preparation

a. Set DY to CRT not to tilt up and down left and right deflection.

b. Set CY to CRT and set CY magnet primarily (Fig. 1)

Purity magnet : Set purity magnet that 2 magnets are (TOP POSITION)

VRS magnet : Set purity magnet 2 magnets are (HORIZONTAL POSITION)

2. Adjustment

a. Receive that Cross Hatch pattern.

b. Adjust V-SHIFT -50Hz.

c. Set 2 magnets of horizontal position to up and down equally so that it will be the center part of CRT. (Fig. 2)

TX-21FG20R

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