Panasonic TX-29FX20R Bedienungsanleitung

Power Source : AC SINGLE 220-240V, 50/60 Hz

Power Consumption : 98W

Aerial Impedance : 75Ωunbalanced

Coaxial type

Receiving System : 17 Systems

Receiving Channels :

VHF 2-12 PAL / SECAM B,K1

0-12 PAL B (AUST)

1-9 PAL B (N.Z)

1-12 PAL/SECAM D

1-12 NTSC M (JAPAN)

2-13 NTSC M (U.S.A)

UHF 21-69 PAL G,H,I / SECAM G,K,K1

28-69 PAL B (AUST)

13-57 PAL D,K

13-62 NTSC M (JAPAN)

13-69 NTSC M (USA)

CATV S1-S20 (OSCAR)

1-125 (U.S.A CATV)

C13-C49 (JAPAN)

S21-S41 (HYPER)

Z1-Z37 (CHINA)

5A, 9A (AUST)

Video / Audio Terminals :

DVD

Y1.0Vp-p, 75Ω

PB 0.7Vp-p, 75Ω

rights reserved. Unauthorized copying and

distribution is a violation of law.

TX-29FX20R

GP41 Chassis

PR 0.7Vp-p, 75Ω

AV 1,2,3

Video In 1Vp-p, 75Ω

Audio In Approx. 0.5V, 47kΩ

Monitor Out

Video Out 1Vp-p, 75Ω

Audio Out Approx. 0.5V, 1kΩ

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)

Colour 33.57 MHz (PAL)

33.6 MHz (SECAM)

33.75 MHz (SECAM)

34.42 MHz (NTSC)

High Voltage : 31.0kV ±1.0

at zero beam current

Picture Tube : A68LZU185X-E

67.6cm (29 inches)

Measured diagonally,

90° deflection

Audio Output : 16.0W

Dimensions : Height:578mm

Width : 786 mm

Colour Television

Specifications

ORDER NO. MTV0601420CE

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Depth : 508 mm

Mass : 43 kg (Net Wt.)

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. GP41 Chassis Block Diagram 4

2 Service Hints 5

2.1. Service Position for E-Board 5

2.2. Adjustment for White Balance 5

2.3. Adjustment for CRT CUT OFF 5

Specifications are subject to change without notice.

Mass and dimensions shown are approximate.

2.4. Adjustment Procedure 6

2.5. Adjustment 7

3 Conductor Views 9

4 Schematic Diagram 10

4.1. A Board 12

4.2. L Board 17

4.3. G Board 20

5 Parts Locations 23

6 Replacement Parts List 24

6.1. Replacement Parts List 25

CONTENTS

Page Page

TX-29FX20R

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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 32.0kV 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 32.0kV 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 31.0±1.0kV. 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-29FX20R

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1.5. GP41 Chassis Block Diagram

GP41 CHASSIS BLOCK DIAGRAM

CRT

defl.

coil

CRT

DRIVE

VM DRIVE

FRONT INPUTS

AV2 : V/L/R

MAIN

POWER

SWITCH

GEOMAGNETIC

WOOFER

AMP

IC2401

PVP

IC1801

R/G/B

SCL

SDA

CVBS IN

REAR INPUTS

AV1 : V/L/R

AV 3 : YUV/V/L/R

VCT-IF

IC601

CVBS OUT

MON_OUT

R/G/B

MON_OUT

V/L/R

EEPROM

IC1101

SCL SDA

IF H

AUDIO

OUT

SPEAKER

AUDIO

AMP

IC2301

V OUT

H OUT

TUNER

FRONT INPUTS

AV2 : V/L/R

29" models

PIP models

TX-29FX20R

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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. 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 = 6.5 ± 1.0 nit.

2. Adjustment R-CUT OFF, so that X = 0.247 ± 0.005 nit.

3. Adjustment G-CUT OFF, so that Y = 0.273 ± 0.005 nit.

Adjustment of High Light

1. Adjustment Sub Bright, so that Y = 150 nit.

2. Adjustment R-Drive, so that X = 0.261 ± 0.003 nit.

3. Adjustment B-Drive, so that Y = 0.267 ± 0.003 nit.

2.3. Adjustment for CRT CUT OFF

Preparation:

1. Connect the oscilloscope probe to (GREEN CATHODE) on L Board.

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” to set voltage as in table 1.

TX-29FX20R

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2.4. Adjustment Procedure

2.4.1. +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 15 : 3.35 ± 0.2V

TPA 16 : 141 ± 2V

TPA 17 : 8.2 ± 0.3V

TPA 18 : 1.9 ± 0.2V

TPA19 : 5.2 ± 0.2V

TPA20 : 220 ± 15V

2.4.2. 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 16 and confirm the +B voltage is 141.0 ± 2V.

2. Connect a high frequency voltmeter to heater and confirm that voltage reads 6.3 ± 0.24 (VRMS).

3. Normalize the brightness and contrast.

TX-29FX20R

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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.

2.5. Adjustment

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

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

TX-29FX20R

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Fig. 10

Fig. 11

Notes:

1. Wedge A, B and C should be inserted following the sequence of 1, 2 and 3 shown in Fig. 11.

2. The wedges should be set 120° apart from each other.

3. Be certain that three wedges are firmly fixed and the Deflection Yoke is tightly clamped in place.

Otherwise the Deflection Yoke may shift its position and cause a loss of convergence and purity.

TX-29FX20R

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3 Conductor Views

TX-29FX20R

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4 Schematic Diagram

TX-29FX20R

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