Text preview for : TX-21JT1P.pdf part of Panasonic TX-21JT1P Service Manual for Colour Television models: TX-21JT1P TC-21JR1P TX-14JT1P TC-14JR1P /B (B is Black Cabinet)



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ORDER No. 00-SM-005

Colour Television

TX-21JT1P TC-21JR1P TX-14JT1P TC-14JR1P
Z7 Chassis

(Information in brackets {} refer to TX-14JT1P,TC-14JR1P)

SPECIFICATION

Power Source: Power Consumption: Stand-by Power Consumption: Aerial Impedance: Receiving System: Receiving Channels: VHF E2-E12 VHF A-H (ITALY) CATV (S01-S05) CATV S11-S20 (U1-U10) VHF R1-R2 VHF R6-R12

220-240V a.c., 50Hz 72W {47W} 1,1W 75 unbalanced, Coaxial Type

RCA IN RCA IN High Voltage: Picture Tube: Audio Output: Headphones:

Video 1V p-p 75 Audio 500mV rms 10k 26,7kV ±1kV {22,7kV ±1kV} A51EAL155X13 51cm {A34EAC01X13 34cm} 6W (M.P.O.) 3W (R.M.S.) 8 Impedance 8 Impedance Remote Control 2 x R6 (UM3) Batteries 476mm 512mm 470mm 20,6kg {352mm} {371mm} {371,5mm} {9,5kg}

PAL B/G, D/K,PAL-60 SECAM B/G, D/K VHF H1-H2 (ITALY) UHF E21-E69 CATV S1-S10 (M1-M10) CATV S21-S41(HYPERBAND) VHF R3-R5

Accessories supplied : Dimensions: Height: Width: Depth: Net weight:

Intermediate Frequency: Video/Audio Video 38,9 MHz Audio 33,4 MHz, 32,4 MHz Colour 34,47 MHz(PAL) 34,5 MHz(SECAM) 34,65 MHz(SECAM) Terminals: AV1 IN Video (21 pin) 1V p-p 75 Audio (21 pin) 500mVrms 10k RGB (21 pin) Video (21 pin) 1V p-p 75 Audio (21 pin) 500mV rms 1k

Specifications are subject to change without notice. Weights and dimensions shown are approximate. NOTE: This Service Manual should be used in conjunction with the Z7 Technical guide.

AV1 OUT

CONTENTS
SAFETY PRECAUTIONS..........................................................................................................................................................2 SERVICE HINTS .......................................................................................................................................................................3 ADJUSTMENT PROCEDURE AND FACTORY SETTINGS .....................................................................................................4 WAVEFORM PATTERN TABLE ...............................................................................................................................................5 ALIGNMENT SETTINGS...........................................................................................................................................................6 BLOCK DIAGRAMS ..................................................................................................................................................................7 PARTS LOCATION .................................................................................................................................................................10 REPLACEMENT PARTS LIST ................................................................................................................................................11 SCHEMATIC DIAGRAMS .......................................................................................................................................................20 CONDUCTOR VIEWS.............................................................................................................................................................27

SAFETY PRECAUTIONS
1. 2.

GENERAL GUIDE LINES

3.

4. 5.

6.

LEAKAGE CURRENT COLD CHECK
1. 2. 3.

It is advisable to insert an isolation transformer in the a.c. supply before servicing a hot chassis. When servicing, observe the original lead dress in the high voltage circuits. If a short circuit is found, replace all parts that have been overheated or damaged by the short circuit. After servicing, see that all the protective devices such as insulation barriers, insulation papers, shields and isolation R-C combinations are correctly installed. When the receiver is not being used for a long period of time, unplug the power cord from the a.c. outlet. Potentials as high as 27,7kV {23,7kV} are 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 familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the tube. After servicing make the following leakage current checks to prevent the customer from being exposed to shock hazard. Unplug the a.c. cord and connect a jumper between the two prongs of the plug. Turn on the receivers power switch. Measure the resistance value with an ohmmeter, between the jumpered a.c. 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 4M ohm and 20M ohm. When the exposed metal does not have a return path to the chassis, the reading must be infinite.

5. 6.

Reverse the a.c. plug at the outlet and repeat each of the above measurements. The potential at any point should not exceed 1,4Vrms. In case a measurement is outside the 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.

HOT CHECK CIRCUIT
a.c. VOLTMETER

2k

10 Watts

WATER PIPE (EARTH)

TO INSTRUMENT'S EXPOSED METALLIC PARTS

Fig. 1.

X-RADIATION WARNING
1. 2.

The potential sources of X-Radiation in TV sets are the high voltage section and the picture tube. When using a picture tube test jig for service, ensure that the jig is capable of handling 27,7kV {23,7kV} without causing X-Radiation.

LEAKAGE CURRENT HOT CHECK
1. 2. 3. 4.

Plug the a.c. cord directly into the a.c. outlet. Do not use an isolation transformer for this check. Connect a 2k 10W resistor in series with an exposed metallic part on the receiver and an earth, such as a water pipe. Use an a.c. voltmeter with high impedance to measure the potential across the resistor. Check each exposed metallic part and check the voltage at each point.

NOTE: It is important to use an accurate periodically calibrated high voltage meter. 1. Set the brightness to minimum. 2. Measure the high voltage. The meter should indicate 26,7kV ± 1kV {22,7kV ± 1kV}. If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure. 3. To prevent any X-Radiation possibility, it is essential to use the specified tube.

2

SERVICE HINTS
How to remove the rear cover
1. Remove the 5 screws as shown in Fig.2.

Screews Fig.2.

LOCATION OF CONTROLS

E - Board

Y - Board

Screen Fig.3.

Focus

3

ADJUSTMENT PROCEDURE
Item / Preparation +B SET-UP
1. Operate the TV set, pattern crosshatch. 2. Set the controls : Brightness Contrast Volume Minimum Minimum Minimum Confirm the following voltages. TPE1 TPE2 TPE3 10 5,2 13 {13,5 TPE4 21,5 {20,5 TPE5 5 TPE6 9 TPE9 30,4 {31 TPE10 191 {147 ± ± ± ± ± ± ± ± ± ± ± ± 1V 0,3V 1V 1V} 1,5V 1,5V} 0,3V 1V 2,5V 2,5V} 10V 10V} TPE11 -13,2 {-13,8 TPE12 13,2 {12,8 TPE13 125 {104 TPE14 7,9 TPE18 8,2 {8,1 TPE19 31 {30,6 ± ± ± ± ± ± ± ± ± ± ± 1V 1V} 1,5V 1,5V} 1,5V 1,5V} 1V 1V 1V} 1V 1,5V}

Adjustments

FACTORY SETTINGS
To return customer settings to factory settings and clear owner ID of all information input by the customer, enter Self-Check mode. Press the down (-/v) button on the customer controls at the front of the TV set, at the same time pressing the STATUS button on the remote control. To exit Self Check, switch off the TV set at the power button. NOTE: Self Check should only be used when refurbishing the TV set and not during normal repair work.

OPTION

F7

Service Aids

To aid in the service of our current chassis there are a number of Service Aids which have been made available. LUCI interface kit (Linked Utility Computer Interface) Part number: TZS6EZ002 This contains interface and cables for connecting TV service connector and a PC as well as diagnostic software. As new models are introduced upgrade software will become available. VICI (Visual Interactive Computer Information) These C.D.'s contain multimedia documentation providing quick access to service information. Part No. TZS7EZ006, TZS7EZ005, TZS8EZ001& TZS9EZ001 1. Service Manuals 2. Instruction Books 3. Technical Information TASMIN (Technically Advanced System for Multimedia Interactive Notes) As well as providing a first step towards more interactive training this product also achieves quick access to Technical Information.

4

WAVEFORM PATTERN TABLE

CONDITIONS:
Contrast: MAX Brightness: MID Colour: MID CATS: OFF Sharpness: MID

5

ALIGNMENT SETTINGS
1. 2. 3. 4. 5. 6. Select program position 60 and set the sharpness to minimum. Press the Off Timer button on the remote control and at the same time press the controls at the front of the TV, this will place the TV into Service Mode. Press the / buttons to step up / down through the functions. (down) button on the customer

Press the + / - buttons to after the function values. Press the STORE button after each adjustment has been made to store the required values. To exit Service Mode press the Normalization button.

NOTE : The figures used below are nominal and used for representative purposes only. Alignment Function 1. Vertical amplitude Setting indication Note: All setting values are approximate V-Amp 31 2. Vertical position V-Pos 22 3. Horizontal centre H-Ctr 07 4. Red cutoff R-Cut 148 5. Green cutoff G-Cut 146 6. Blue cutoff B-Cut 163 7. Red drive R-Drv 37 8. Blue drive B-Drv 25 9. AGC AGC 29 10. Sub contrast S-Con 26 11. Sub colour S-Col 49 12. Sub bright S-Bri 43 Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting. Optimum setting Settings / Special features Optimum setting

6

PARTS LOCATION
NOTE:
The numbers on the exploded view below refer to the exploded view section of the Replacement Parts List.

17 2 6 12 16 4 1 7 20 22 13

8 11 15 14 10 21 19 3 5 9

10

18

SCHEMATIC DIAGRAMS FOR MODEL TX-21JT1P, TC-21JR1P, TX-14JT1P, TC-14JR1P (Z7 CHASSIS)
Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacturers' specified parts.

IMPORTANT SAFETY NOTICE

NOTE
1. 2. 3. 4. RESISTOR All resistors are carbon ¼W resistor, unless marked otherwise. Unit of resistance is OHM ( ) (k=1,000, M=1,000,000) CAPACITORS All capacitors are ceramic 50V unless marked otherwise. Unit of capacitance is F unless otherwise stated. COIL Unit of inductance is H, unless otherwise stated. TEST POINT Test Point Position EARTH SYMBOL Chassis Earth (Cold) Line Earth (Hot) 6. VOLTAGE MEASUREMENT Voltage is measured by a d.c. voltmeter. Measurement conditions are as follows: Power source a.c. 220V-240V, 50Hz Receiving Signal Colour Bar signal (RF) All customer controls Maximum position

5.

7. Indicates the Video signal path Indicates the Audio signal path These schematic diagrams are the latest at time of printing and are subject to change without notice.

REMARKS
a. b. c. d. Do not touch the hot part, or the hot and cold parts at the same time, as you are liable to a shock hazard. Do not short circuit the hot and cold circuits as electrical components may be damaged. Do not connect an instrument, such as an oscilloscope, to the hot and cold circuits simultaneously as this may cause fuse failure. Connect the earth of the instruments to the earth connection of the circuit being measured. Make sure to disconnect the power plug before removing the chassis.

NOTE
1. The Power Supply Circuit contains a circuit area, which uses a separate power supply to isolate the earth connection. The circuit is defined by HOT and COLD indications in the schematic diagram. All circuits, except the Power Circuit, are COLD.

20

CONDUCTOR VIEWS FOR MODELS TX-21JT1P, TC-21JR1P, TX-14JT1P, TC-14JR1P

Y-BOARD TNP8EY011
TRAN´S Q351 B2 Q352 C1 Q353 A2 Q354 C1 DIODES D351 C1 D352 C1 D353 C1 D354 C1 T.P.´S TPY4 B2 TPY5 B1

1

2

C

B

A

27

E-BOARD TNP8EE007
TC-21JR1P TC-14JR1P TC-21JR1P TC-14JR1P TC-21JR1P
NO

TRAN'S Q101 B5 Q201 A3 Q202 A4 Q203 A4 Q251 D3 Q301 B4 Q302 C3 Q303 B5 Q453 E6 Q454 E6 Q501 F5 Q502 B4 Q503 E5 Q504 E5 Q507 B5 Q551 H4 Q801 F3 Q802 G3 Q1201 G1 Q1202 E2 Q1203 E2 Q1204 E2 Q1205 C3 Q1207 C4 Q1208 C4 Q1209 C4 Q1210 E3 Q1211 C3 Q1212 D2 Q1213 C4 Q1214 C4 Q1215 B4 Q1216 D2 Q1217 D2 Q1240 C6 Q1295 C5 Q1296 D6 Q3101 D5 Q3103 A4 Q3104 A4 Q3105 C5 Q3106 D5 Q3107 D5 Q3108 C6 DIODES D010 E6 D011 E6 D201 A4

NO NO

NO NO NO

NO NO NO

D202 D304 D306 D307 D452 D453 D454 D455 D503 D504 D505 D506 D507 D541 D542 D551 D552 D553 D554 D555 D556 D557 D801 D802 D803 D804 D805 D808 D809 D810 D811 D812 D814 D815 D816 D851 D852 D857 D858 D859 D860 D861 D1202 D1205 D1207 D1208 D1209 D1210 D1211 D1212

A4 B5 B6 B5 E6 E6 E6 E6 C5 C6 E5 C5 D5 F6 E6 H5 H4 F6 G6 F6 F6 E5 G2 G2 H2 H2 F2 G3 G3 G4 G3 G3 E2 G3 G3 E4 F4 E5 E5 E5 D5 D4 E2 E1 D1 E1 E2 D2 D4 E2

D1213 D1214 D1217 D1218 D1219 D1220 D1221 D1222 D1223 D1224 D1225 D1226 D1227 D1228 D1301 D1311 D1312 D3101 D3108

E3 E3 C4 C4 C4 C5 C5 C5 C3 D2 F5 D2 D2 C2 D5 E3 B2 D6 C6

NO

NO NO

I.C.'S IC251 D3 IC451 E6 IC601 B4 IC602 B3 IC603 B3 IC801 G3 IC851 E5 IC852 E4 IC853 D5 IC1201 D2 IC1202 D1 IC1204 G1 IC1205 D2 T.P.'S TPE1 E2 TPE2 E2 TPE3 E4 TPE4 E4 TPE5 E5 TPE6 E4 TPE9 E5 TPE10 F6 TPE11 E6 TPE12 F6 TPE13 G5 TPE14 D4 TPE18 B5 TPE19 A6

28

TC-14JR1P

TX-21JT1P

TX-14JT1P

TX-21JT1P

TX-14JT1P

TX-21JT1P

TX-14JT1P

E ­ BOARD TNP8EE007

1

2

3

29
F E D C B A

4

5

6

H

G

NOTES

30