Panasonic TX-21PM30T Manuel utilisateur

Service Manual

Colour Television

TX-21PM30T

MX-7 Chassis

Specifications

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

FAV In : Video In 1 Vp-p 75

Power Consumption : 86W Audio In Approx, 400mVrms

RAV In : Video In 1 Vp-p 75

Aerial Impedance:75 unbalanced Audio In Approx, 400mVrms

Coaxial type Monitor Out :Video Out1 Vp-p 75

Audio OutApprox, 400mVrms

Receiving System : 17 System

Receiving Channels : High Voltage : 28.0 kV ( +/- 1.0 )

VHF 2-12 (PAL/SECAM B,K1) at zero beam current

0-12 (PAL B AUST)

1-9 (PAL B N.Z) Picture Tube : A51LSK955X-A

1-12 (PAL/SECAM D) 51cm (21 inches)

1-12 (NTSC M JAPAN) Measured diagonally, 90 deflection

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

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

28-69 (PAL B AUST) Audio Output : 3.5W x 2 = 7W

13-57 (PAL D,K)

13-62 (NTSC M JAPAN)

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

CATV S1-S41(OSCAR) Dimensions : Height : 473.6 mm

1-125 (U.S.A CATV) Width : 600.0 mm

C13-C41(JAPAN) Depth : 484.4 mm

S21-S41 (HYPER)

Z1-Z37 (CHINA) Mass : 23.4 kg

Intermediate Frequency :

Video 38.0 MHz Specifications are subject to change without

Sound 31.5 MHz (D,K) / 32.5MHz (B,G) notice.Mass and dimensions shown are approxi

32.0 MHz (I) / 33.5MHz (M) mate.

Colour 33.57 MHz (PAL)

33.6 MHz (SECAM)

32.5 MHz (B,G)

33.75 MHz (SECAM)

34.42 MHz (NTSC)

Panasonic

2000 Matsushita Electric Industrial Co., Ltd.

distribution is a violation of law.

ORDER NO. MTV 0010154C3

Ω

Contents

.Safety Precautions ........................................................................................ 2

.MX-7 Chassis Block Diagram .................................................................... 4

.Service Hints ................................................................................................. 5

.Adjustments ...................................................................................................7

.Conductor Views ...........................................................................................13

.Parts Location ...............................................................................................18

.Replacement Part List ................................................................................. 19

This service literature is designed for experienced repair technicians only and is not designed for use by the

general public. It does not contain warning cautions to advise non-technical individuals of potential dangers in

attempting to service a product. Product powered by electricity should be serviced or repaired only by

experienced professional technicians. Any attempt to service or repair the product or products dealt with in this

service literature by anyone else could result in serious injury or death.

WARNING !

Safety Precautions

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 circuits 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 28.0kV. 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.

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 metal-

lic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts, ect. When the

exposed metallic part has a return path to the chassis, the reading should be between 4 Mohm and 20

Mohm.When the exposed metal does not have a return path to the chassis, the reading must be infinite.

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 kohm 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 2mA DC. In the case of a measure-

ment 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

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 28.0kV 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 27.0(±1.0)kV. 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 specifield picture tube, if service replacement becomes

necessary.

1.5. MX-7 Chassis Block Diagram

TX-21PM3 T

TUNER SAW

AUDIO

EAR

PHONE

SPEAKER

V OUT

H OUT

FBT

SCREEN

FOCUS

RGB

IC6 1

EHT

CRT

TONE

CIRCUIT

SIF

TRAP

POWER

SAW

FM DEMOD.

( Z - BOARD ).

Service Hints.

Service Position for E-Board

1. Remote the back cover.

2. Stand the TV set as shown in fig. 7.

3. Remove the A-Board from the TV set by pulling the main board out as shown in figure 7.

Fig.7

Factory mode adjustment :

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

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 than press the off timer button on

remote control.

Pull out this way

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 to DYNAMIC NORMAL.

3. Degause 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 +- 1.0nit.

2. Adjust R-CUT OFF, so that X = 0.235 +- 0.01nit.

3. Adjust G-CUT OFF, so that y = 0.235 +- 0.01nit.

Adjustment of High Light.

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

2. Adjust R-Drive, so that X = 0.265 +- 0.01nit.

3. Adjust B-Drive, so that y = 0.265 +- 0.01nit.

Adjustment for CRT CUT OFF.

Preparation :

1. Connect ocilloscope probe to TPL7.

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.

130V

Adjustment Procedure

Item / Preparation Adjustment Procedure

+B Voltage

1. Operate the TV set. Confirm the DC voltage at the indicated test points,

as follow :

2. Set control as follow : TPA 12 : 141.2 +- 0.8V TPA 21 : 215 +- 15V

Brightness ..... minimum TPA 11 : 8 +- 1V

Contrast ........ minimum TPA 10 : 5 +- 1V

RF AGC

1. Receive a colour bar signal at an 1. Select“RFAGC” indication in CHK 2, onScreen

RF level of 69dBU with 75 by remote control at factory mode.

loaded.

2. Connect digital multimeter to RF AGC 2. Set RF AGC by using remote control volume (+)

at Tuner. or volume (-) button until voltage AGC at Tuner

reach 2.7 +- 0.1V.

3. Increase RF signal strenght by 2dB, confirm

AGC at Tuner voltage drop.

High Voltage

1. Receive the crosshatch pattern. 1. Connect a DC voltage meter to TPA 12

and confirm the +B voltage is 141.2 +- 0.8V.

2. Set to 0 Beam . 2. Connect a high frequency voltmeter to heater and

Screen VR ..... minimum confirm that voltage reads 6.3+- 0.24 (VRMS).

Contrast ....... minimum 3. Normalize the brightness and contrast.

Item / Preparation Adjustment Produre

Connect a short jumper between TPA 10 1. Adjust Sub-Tint so that No.2,3 and 4 becomes

and TPA 20. level waveform is similiar to Fig. 10.

Press Main Menu and Set system to 2. Confirm phase at Tint is changes more than

Use AV-NTSC (3.58MHz). +/- 30 by Tint control.

DYNAMIC ....... Normal 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.

0.5a

7 8 9 10

1 2 3 4 5 6

Fig. 10

Ω

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 - 63 , Sub Contrast - 21.

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

4. Connect TPA 10 to TPA 20.

5. Set (A) to 2.3 +- 0.2V by BRT (CHK2) Fig. 1.

Adjustment

1. Connect oscilloscope probe to TPA 31 (G OUT) with 10k series resistor and adjust Contrast so

that (B) as in Fig.1 is 2.8 +- 0.1V.

2. Adjust ‘Sub Colour’ so that waveform as in Fig.1 (1) 2.55 +- 0.1V.

3. Connect oscilloscope probe to TPA 32 (R OUT) with 10k series resistor and confirm waveform as in

Fig.2 is (2).2.7 +- 0.4V

Fig. 1 Fig. 2

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

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

Colour Purity Convergence

1. Set the Brightness and Contrast controls to 1. Apply a crosshatch pattern signal and

their maximum postions. Normalize Contrast control to the

2. Operate the TV set for 30 minutes. maximum positions.

3. Fully degauss the picture tube by using an 2. Adjust Brightness until the grey position of

external degaussing coil. the crosshacth pattern just becomes black.

4. Apply a crosshatch pattern signal and adjust 3. Adjust the Red and Blue line at the centre of

the static convergence magnets to the the screen by rotating the R-B static

approximately correct position.

5. Receive a black and White signal.

6. Set the control as following:

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

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

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

Press the Shipping button on the remote control

twice to select CRT Adjustment Mode as per

Fig. 16 to select low light.

7. Loosen the clamp screw for the deflection yoke

A in Fig. 24 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 cntre of the screen. Fig.22

4. Adjust Red and Blue with Green line at

centre of the screen by rotating (RB) -G

static convergence magnetic rings.

5. Lock convergence magnetic with silicne

sealer.

6. Remove the DY wedges and slightly tilt the

deflection yoke vertically and horizontally to

obtain the good overall convergence.

Fig.20

9. Slowly push the deflection yoke and set it where

a uniform green field is obtained.

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

tings and make sure that a uniform white field is

obtained. 7. Fix the deflection yoke by re-inserting the DY

11. Tighten the clamp screw A in Fig. 24. wedges.Refer to Fig. 24.

8. If purity error is found, repeat “Colour

Purity” adjustment.

Slide magnetic tabs toward or away from

each other.

R-B Static

Convergence Magnet

Vertical

Convergence

Red & Blue

Horizontal

Convergence

Red & Blue

Rotate both magnetic rings together.

R-B Static

Convergence Magnet

Vertical

Horizontal

RGB

BGR

Purity Magnet Green Field

Colour Purity

Green

Uniform

green

Fig. 21

Fig. 23

Fig. 24

Fig. 25

Note :

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

in Fig. 25.

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

3. Be certain that four 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.

25.3 mm

R-B Static

Convergence Magnet

Purity Magnet(RB)-G Static

Convergence Magnet

Clamp for

Convergence &

Purity Magnet

Deflection Yoke

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