Panasonic TX-29FX20R Manuel utilisateur

ORDER NO. MTV0601420CE

Colour Television

TX-29FX20R

GP41 Chassis

SPECIFICATIONS

Specifications

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

Power Consumption : 98W

Aerial Impedance : 75 unbalanced

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, 75

PB 0.7Vp-p, 75

PR 0.7Vp-p, 75

AV 1,2,3

Video In 1Vp-p, 75

Audio In Approx. 0.5V, 47k

Monitor Out

Video Out 1Vp-p, 75

Audio Out Approx. 0.5V, 1k

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 : 578 mm

Width : 786 mm

Depth : 508 mm

Mass : 43 kg (Net Wt.)

Specifications are subject to change without notice. / Mass

and dimensions shown are approximate.

Unauthorized copying and distribution is a violation of law.

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 M and 20

M . 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 k non-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.

1.5. GP41 Chassis Block Diagram

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.

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.

2.5. Adjustment

Before Colour Purity, Convergence and White Balance

adjustment are attempted,

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

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.

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.

3. Conductor Views

4. Schematic Diagram

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