Panasonic TX-28F250A-AUSTRALIA User manual

Order No. MTV0501356C3

Colour Television

TX-28F250A-AUSTRALIA

GP2 Chassis

SPECIFICATIONS

Specification

Power Source AC SINGLE 230-240V, 50 Hz

Power Consumption 149 W

Standbycondition : 2W

Aerial Terminal Impedance : 75 , Coaxial type

Tuning System FrequencySynthesizer

AutoSearchTuning

Pos: 100 Positions

Receiving System 21 Systems

Receiving Channels Regular TV

VHFBAND 0-12 (PAL/SECAM B, K1)

0-12 (PALB AUST.)

1-9(PALB N.Z.)

1-12 (PAL/SECAM D)

1-12 (NTSC M JAPAN)

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

UHFBAND 21-69 (PALG, H, I/SECAM G, K,

K1)

28-69 (PALB AUST.)

13-57 (PALD, 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.)

IntermediateFrequency 38.0MHz

Video 31.5MHz (D, K) / 32.5MHz (B, G)

32.0MHz (I) / 32.5MHz (M)

Sound 33.57 MHz (PAL) /

Colour 33.6MHz (SECAM)

34.42 MHz (NTSC) /

33.75 MHz (SECAM)

Video/Audio/Terminals

AV 1, 2, 3, 4 S-VideoIn

Y:1Vp-p, 75

C:0.3Vp-p, 75

DVD

Y1.0Vp-p, 75

PB0.7Vp-p, 75

PR0.7Vp-p, 75

VideoIn 1Vp-p, 75

AudioIn Approx. 0.5V, 47K

MonitorOut

VideoIn 1Vp-p, 75

AudioIn Approx. 0.5V, 47K

High Voltage 31.0±1.0at zero

beam current

Picture Tube W66MAF185X Type28 (65.6cm)

Measureddiagonally

104° deflection

AudioOutput 20 Wspeaker

Dimensions(WxD xH) 731 mm x545 mm x498 mm

Weight (Mass) 41 kg(Net)

Note:

Specificationsare subject tochangewithout notice. Mass and

dimensionsshownare approximate.

Unauthorized copying and distribution isaviolation of law.

1. Safety Precautions

1.1. General Guide

1. Itisadvisableto insert an isolation transformer inthe AC supply

before servicing ahot chassis. Fig. 1.

Fig. 1

2. When servicing, observe the original lead dress, especiallythe

lead dress inthe high voltage circuits. Ifashort circuitisfound,

replace all parts which have been overheated or damaged bythe

short circuit.

3. After servicing, observe that all the protective devices such as

insulation barriers, insulation papers, shields, and isolation R-C

combinations, are properlyinstalled.

4. When the receiver isnot to be used for along period of time,

unplug the power cord from the AC outlet.

5. Potential, as high as 32kV ispresent when thisreceiver isin

operation. Operation of the receiver without the receiver power

supply. Servicing shouldnot be attempted byanyone who isnot

thoroughlyfamiliar with the precautions necessarywhen working

on high voltage equipment. Alwaysdischarge the anode of the

picture tube to the receiver chassisbefore 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 ColdCheck

1. Unplug the AC cord and connect ajumper between the two

prongs on the plug. Fig. 2. Fig. 2

2. Turn on the receiver’spower switch.

3. Measure the resistance value, with an ohmmeter, between the

jumpered AC plug and each exposed metalliccabinet part on the

receiver, such as screw heads, aerials, connectors, control shafts,

etc. When the exposed metallicpart has areturn path to the

chassis, the reading shouldbe between 4M and 20M . When

the exposed metal does not have areturn path to the chassis, the

reading must be zero.

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

1. Plug the AC cord directlyinto the AC outlet. Donot use an

isolation transformer for thischeck.

2. Connect a2k , 10 Wresistor inseries with an exposed metallic

part on the receiver and an earth such as awater pipe.

3. Use an AC voltmeter, with high impedance type, to measure the

potential across the resistor.

4. Check each exposed metallicpart, and measure the voltage at

each point. Fig. 3. Fig. 3

5. Reverse the AC plug inthe AC outlet and repeat each of the above

measurements.

6. The potential anypoint shouldnot exceed 1.0V rms. Inthe case of

ameasurement being outside of the limits specified, there isa

possibilityof ashock hazard, and the receiver shouldbe repaired

and re-checked before itisreturned to the customer. Fig. 4.

Fig. 4

1.4. X-Radiation

Warning :

1. The potential sources of X-Radiation inTV sets are the EHT

section and the picture tube. /

2. When using apicture tube test rigfor service, ensure that the rig

iscapableof handling 30 kV without causing X-Radiation. /

Note: It is important touse anaccurate periodicallycalibratedhigh voltage meter. /

1. Set the brightness to minimum.

2. Measure the High Voltage. The meter reading shouldindicate 31.0

± 1.0kV. Ifthe meter indication isout of tolerance, immediate

service and correction isrequired to prevent the possibilityof

premature component failure.

3. To prevent the possibilityof X-Radiation, itisessential to use the

specified picture tube.

1.5. GP2 Block Diagram

2. Service Hints

2.1. How to move chassisinto service position

1. Remove 9screws.

2. Draw out MainChassis.

3. Stand the MainChassis.

3. Market Mode Function

Outline:

MPU controls the functions switching foreachICs through IIC bus inthis chassis. The following

setting and adjustment canbe adjustedbyremote control inMarket Mode.

1. Selection of Market Mode

Adjust the VOLUME “zero” and set OFF TIMERButton to 30 min.

Then, simultaneouslypress the RECALL Button on the remote

control and the VOLUME DOWNbutton -the TV set.

2. Selection of Service Mode

Press green button to select for adjustment mode, to adjust press

yellow or blue button.

3. Set to normal mode

Press the volume downbutton on front control, together press the

off timer button on remote control.

1. Service 1

H-Pos ..... 33

V-pos ..... -19

H-Pos ..... -17

V-Amp ..... 6

Ew-AMP ..... 6

Lower Corner ..... 20

Trapez 1..... -2

Upper Corner ..... 15

V-Lin..... -8

V-Sym..... 56

Angle..... 2

Bow ..... -4

DVCO ..... 3

2. HIGH..... 0327, 0323, 0324

3. LOW..... 0173, 0204, 0232

Sub Brightness 67

4. Adjustment Procedure

4.1. Adjustment Procedure

4.1.1. +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:

TPD2:144.8± 1V

TPD21 :13.5V ± 1V

TPD3~ TPD4:32V ± 3V

4.1.2. RFAGC

Item/ preparation

1. Receive acolour bar signal at an RFlevel of 69 +1-2 dBU with 75

loaded.

2. Connect digital multimeter to RFAGCat Tuner.

Adjustment procedure

1. Select “RFAGC”indication inCHK2, on Screen byremote control

at factorymode.

2. Set RFAGCbyusing remote control Volume (+)or Volume (-)

button until voltage AGCat Tuner reaches 2.6± 0.1V at TPA15

(Tuner point).

3. Increase RFsignal strength by2dB, confirm AGCat Tuner voltage

drop.

4.1.3. High Voltage

Item/ preparation

1. Receive the crosshatch pattern.

2. Set to 0Beam.

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

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

Adjustment procedure

1. Connect aDC voltage meter to TPD2and confirm the +Bvoltage

is144.8± 1V.

2. Connect ahigh frequencyvoltmeter to heater and confirm that

voltage reads 6.3± 0.24 (VRMS).

3. Normalize the brightness and contrast.

4.1.4. NTSC TINTCOLOUR

Item/ preparation

1. Connect oscilloscope probe to A2(ROUT) with 10k series

resistor.

2. Press MainMenu and set system to use AV-NTSC(3.58 MHz).

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

Channel CLRSet ..... STD

Adjustment procedure

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

similar to Fig. 3.

2. Confirm phase at Tint ischanges more than ± 15 byTint control.

3. Confirm that colour level ismaximum when colour DAC is

adjusted to maximum position.

Note: Use remote control onlywhen adjusting user mode to Sub-

Tint.

4.2. Colour Purity

1. Set Bright and Contrast controlsto theirmaximum positions.

2. Operate the TV set over 60 minutes.

3. Full degauss the picture tube byusing an external degaussing

coil. Byrotating R-Bstaticconvergence magnet.

4. Applyacrosshatch pattern signal and adjust roughlythe static

convergence magnets.

5. Applyagreen pattern signal.

6. Loosen aclamp screw for the Deflection Yoke and move the

Deflection Yoke as close to the puritymagnet as possible.

7. Adjust the puritymagnet so that avertical green fieldisobtained

at the center of the screen.

8. Slowlypress the Deflection Yoke and set itwhere auniform green

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