Panasonic TX-21RX25R Manuel utilisateur

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

Power Consumption : 86 W

Aerial Impedance : 75 Ωunbalanced

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. ZEALAND)

1-12 PAL / SECAM D

1-12 NTSC M (JAPAN)

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

UHF 21-69PALG,H,I/SECAMG,K,K1

28-69 PAL B (AUST)

13-57 PAL D, K

13-62 NTSC M (JAPAN)

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

CATV S1-S20 (OSCAR)

1-125 (U.S.A. CATV)

C13-C49 (JAPAN)

S21-S41 (HYPER)

Z1-Z37 (CHINA)

5A, 9A (AUST)

rights reserved. Unauthorized copying and

distribution is a violation of law.

TX-21RX25R

GP41Z Chassis

Video / Audio Terminal :

DVD

Y1.0 Vp-p 75 Ω

PB0.7 Vp-p 75 Ω

PR0.7 Vp-p 75 Ω

V1,2,3

Video In 1Vp-p75Ω

Audio In Approx. 0.5 V, 47 kΩ

Monitor Out

Video Out 1Vp-p75Ω

Audio Out Approx. 0.5 V, 1 kΩ

High Voltage : 24.0 kV ± 1.5

at zero beam current

Picture Tube : A51QGA993X01

51.0 cm (21 inches)

Measured diagonally,

90° deflection

Audio Output : 20.0 W

Dimensions : Height : 431 mm

Width : 596 mm

Depth : 340 mm

Mass : 20.5 kg (Net)

Specifications are subject to change without notice.

Mass and dimensions shown are approximate.

Colour Television

Specifications

ORDER NO. MTV0801590CE

1 Safety Precautions 3

1.1. General Guidelines 3

1.2. Leakage Current Cold Check 3

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

1.4. X-Radiation 4

1.5. SW-Board Fix to Cabinet 4

1.6. GP41Z Chassis Block Diagram 5

2 Service Hints 6

2.1. Service Position for E-Board 6

2.2. Service Mode Explanation 6

2.3. Adjustment for White Balance 7

2.4. Adjustment for CRT CUT OFF 7

2.5. Adjustment Procedure 7

2.6. Adjustment of Purity 8

3 Location of Lead Wiring 20

3.1. Wire Dressing 20

3.2. Wire Dressing and Connections 21

4 Conductor Views 22

5 Schematic Diagram 23

5.1. A Board 25

5.2. L Board 30

5.3. V Board 33

5.4. PP Board 35

5.5. G Board 37

5.6. K Board 39

5.7. P Board 40

5.8. SW Board 41

6 Parts Locations 43

6.1. Packing Exploded View - A 43

6.2. Packing Exploded View - B 44

6.3. Parts Locations 45

7 Replacement Parts List 46

7.1. Replacement Parts List 47

CONTENTS

Page Page

TX-21RX25R

1 Safety Precautions

1.1. General Guidelines

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 power socket.

5.Potential, as high as 25.0 kV 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 check to

prevent the customer from being exposed to shock hazards.

1.2. Leakage Current Cold Check

1.Unplug the power 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 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 power cord directly into the power socket. Do not use an isolation transformer for this check.

2.Check that a 2 kΩnon-inductive resistor and an AC/DC current meter are 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

TX-21RX25R

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 the jig is capable of handling 25.5 kV 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 remote to get into Service Mode.

3.Measure the EHT. The meter reading should indicate 24.0 ± 1.5 kV. If the meter indication is out of tolerance, immediate

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

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

necessary.

1.5. SW-Board Fix to Cabinet

TX-21RX25R

1.6. GP41Z Chassis Block Diagram

ONLY FOR MODEL WITH

5TH HARMONIC COIL

CRT

defl.

coil

CRT

DRIVE

MAIN

POWER

SWITCH

PVP

IC1801

R/G/B

SCL

SDA

CVBS IN

REAR INPUTS

AV1 : V/L/R

AV3 : YUV/V/L/R

VCT-IF

IC601

V_IN

CVBS OUT

MON_OUT

R/G/B

MON_OUT

V/L/R

EEPROM

IC1101

SCL SDA

A_IN

IF H

AUDIO

OUT

SPEAKER

AUDIO

AMP

IC2301

V OUT

TUNER

GEOMAGNETIC

GEO

SIDE INPUTS

AV2 : V/L/R

PANEL KEY

REMOTE RECEIVER

LED

VLINE FILTER

PIP MODEL

H OUT

TX-21RX25R

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 Fig. 2.

Fig. 2

2.2. Service Mode Explanation

1.Service Mode Access

a) Set the timer ON.

b) Press remote’s RECALL ( ) and panel’s volume down key simultaneously to enter SERVICE 1.

2.Service Mode 1 Controls

Key 3/4 Previous/Next Service 1 Item

Key 8/9 Adjust user Brightness (-/+)

Program up/down Program position up/down

Volume + Increment of selected item

Volume - Decrement of selected item

OK Store/Save selected item

Normalize Exit service mode

3.Service Mode 2 Controls

To enter SERVICE 2; press channel key ‘1’ in SERVICE 1 entry screen.

Key 3/4 Previous/Next Service 2 Item

Key 8/9 Toggle for option bit 0-7

Program up/down Program position up/down

Volume + Increment of selected item

Volume - Decrement of selected item

OK Store/Save selected item

Normalize Exit service mode

NOTE:- Service Mode 2 options bit refer to each model front cover spec.

4.Service Mode 3 Controls

To enter SERVICE 3; press channel key ‘1’ in SERVICE 2 entry screen.

Key 3/4 Previous/Next Service 1 Item

Program up/down Program position up/down

Volume + Increment of selected item

Volume - Decrement of selected item

OK Store/Save selected item

Normalize Exit service mode

TX-21RX25R

2.3. Adjustment for White Balance

Preparation:

1.Receive the white balance pattern and aging should be 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 = 0.241 ± 0.005 nit.

3.Adjustment G-CUT OFF, so that Y = 0.242 ± 0.005 nit.

Adjustment of High Light

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

2.Adjustment R-Drive, so that X = 0.263 ± 0.003 nit.

3.Adjustment B-Drive, so that Y = 0.261 ± 0.003 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 presing the volume down or up

button.

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

2.5. Adjustment Procedure

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 15 : 3.35 ± 0.2 V

TPA 16 : 130 ± 2 V

TPA 17 : 8.25 ± 0.35 V

TPA 18 : 1.85 ± 0.15 V

TPA 19 : 5.30 ± 0.2 V

TPA 20 : 188 ± 15 V

TX-21RX25R

2.5.2. 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 130.0 V ± 2.

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

3.Normalize the brightness and contrast.

2.6. Adjustment of Purity

1.INSTRUMENTS

a.Purity Jig

b.Helmhortz device

2.PREPARATION

a.Set the Helmhortz device to local magnetic field.

Horizontal : 0 ± 0.03 × 10-4T

b.Aging should be performed over 60 minutes.

c.Receive the purity pattern (White pattern).

d.Picture menu : CONTRAST ... Max. BRIGHT ... Max.

e.Set V-CENTER to [4].

f.Static convergence should have been roughly adjusted.

g.Connect DC current meter through FBT (pin 3) and adjust to [1200 ± 10%] µA.

3.ADJUSTMENT

a.Set both purity magnet´s knobs to top.

b.Adjust the purity so that the markers on monitor scope of purity jig become symmetrical in horizontal direction.

c.Only for stripe CRT, correct vertical centre by purity magnet too.

d.Set up deflection yoke so that the position of deflection yoke becomes [10 µm ± 5] forward on monitor scope at this time by

attention note to tile deflection yoke.

e.Repeat procedures (a) ~ (d).

f.Tighten deflection yoke band.

g.Adjust beam landing by microscope. (Only for model change or check instruments)

TX-21RX25R

ADJUSTMENT OF CONVERGENCE

1.INSTRUMENT

a.Helmhortz device

2.PREPARATION

a.Set the Helmhortz device to local magnetic field.

Horizontal : 0 ± 0.03 × 10-4T

b.Receive the crosshatch pattern.

c.Picture menu : DYNAMIC Normal and adjust BRIGHT DAC until gray portion of crosshatch.

d.Set DY to CRT not to tilt (up and down and left right).

3.ADJUSTMENT

a.Static Convergence Adjustment

a.Make sure that the magnets are positioned as shown as in Fig. 1.

b.Adjust the 4-pole magnets (Fig. 1) to align centre dots of R and B adjust 6-pole magnets to align centre dots to G.

c.After adjustment, secure magnets with magnet lock of white lacquer.

• Beams move with rotating when static magnet is turned. Rotational reduce of beams differs by angle of two

magnets. Therefore, repeat magnet adjustment several times so that all aligned completely.

b.YHC, YV, XV Adjustment (Fig. 2)

a.Adjust that static and Dynamic convergence is best with YHC VR, YV VR and XV coil. In case of static convergence

is tilted, repeat (1) Static Convergence Adjustment.

c.Dynamic Convergence Adjustment

a.When dynamic convergence is bad, fixing permalloy between neck and DY so that dynamic convergence best.

Fig. 1

4.CONFIRM THAT LEFT UPPER SIDE LINE IS STRAIGHT.

When left upper side line is not straight, put magnet on DY and adjust the left upper side line to straight.

Fig. 2

TX-21RX25R

ADJUSTMENT OF CRT VRS

1.PREPARATION

a.Set DY to CRT not to tilt up and down left and right deflection. (Fig. 1)

b.Set CY to CRT and set CY magnet primarily.

Pur Mg : Set Pur Mg that 2 magnets are horizontal position.

VRS Mag : Set VRS Mg that 2 magnets are top position.

c.Set geomagnetic correction DAC. As in TABLE 1.

2.ADJUSTMENT

a.Receive the white balance pattern.

b.Adjust V-CENTER.

c.Set R,B CUT OFF to minimum, and set G CUT OFF to centre.

d.Receive the aging pattern.

e.Set 2 magnets of vertical position to up and down equally so that centre part of CRT. (Fig. 2)

MANUAL

DAC 0

TABLE 1

Fig. 1

Fig. 2

TX-21RX25R

Table des matières

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