Panasonic BT-S1315DA User manual

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Table Of Contents 
COVER 
1 Safety Precautions 
1.1 General Guidelines 
1.2 Leakage Current Cold Check 
1.3 Leakage Current Hot Check 
1.4 X-Radiation 
1.5 Horizontal Osc. Disable Circuit 
Test 
1.6 Repair Procedure of Horizontal 
Osc. Disable Circuit 
2 Disassembly Instructions 
2.1 Printed Circuit Board Layout 
2.2 Removal of Top Cabinet 
2.3 Removal of Rear Cover 
2.4 Removal of DS-P.C.Board (for 
BT-S1315DAD&sol;S1415DAD only) 
2.5 Removal of B- andW-
P.C.Boards 
2.6 Removal of A-P.C.Board 
3 Picture Tube Replacement 
3.1 Replacement Procedure 
3.2 Location of Magnets 
4 Measurements and Adjustments 
4.1 Adjustment procedure Flowchart 
4.2 Location of Test Points and 
Adjustment Control 
4.3 Warnings 
4.4 Caution 
Service Manual
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VED0006296C0
D6
Color Video Monitor
BT-S1315DA/BT-S1315DAD/BT-S1415DA/BT-S1415DAD
G19M-1 Chassis
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5 Notes 
6 Switching between USER and 
FACTORY Modes 
7 Purity Adjustment 
7.1 Equipment to be used 
7.2 Adjustment Procedure 
8 Convergence Adjustment 
8.1 Equipment to be used 
8.2 Adjustment Procedure 
9 Deflection Adjustment and 
Check 
9.1 Equipment to be used 
9.2 Initial Settings 
9.3 Adjustment Procedure 
10 Cut Off Adjustment 
10.1 Equipment to be used 
10.2 Initial Settings 
10.3 Adjustment Procedure 
11 Contrast Adjustment 
11.1 Equipment to be used 
11.2 Initial Settings 
11.3 Adjustment Procedure 
12 NTSC Color Output 
Adjustment 
12.1 Equipment to be used 
12.2 Initial Settings 
12.3 Adjustment Procedure 
13 White Balance Adjustment 
13.1 Equipment to be used 
13.2 Initial Setting 
© 2000 Matsushita Electric Industrial Co., Ltd./All rights reserved. Unauthorized copying and distribution is a violation of law.
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13.3 Preparations 
13.4 6500K Adjustment 
13.5 9300K Adjustment 
14 SECAM Black Level 
Adjustment 
14.1 Equipment to be used 
14.2 Initial Settings 
14.3 Adjustment Procedure 
15 Brightness and ABL 
Adjustment 
15.1 Equipment to be used 
15.2 Initial Settings 
15.3 Adjustment Procedure 
16 Focus Adjustment 
16.1 Equipment to be used 
16.2 Initial Settings 
16.3 Adjustment Procedure 
17 C&sol;Y Output Adjustment 
(BT-S1315DAD&sol;S1415DAD only) 
17.1 Equipment to be used 
17.2 Adjustment Procedure 
18 X-radiation Protection Circuit 
Adjustment 
18.1 Equipment to be used 
18.2 Initial Settings 
18.3 Adjustment Procedure 
Troubleshooting 
1 The power is not turned on 
2 No raster appears 
3 The raster is a horizontal 
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5.4 No picture appears 
5.5 No on-screen display appears 
5.6 No sound comes out 
6 Operating Instructions 
7 Block Diagram 
8 Schematic Diagram for Models BT-
S1315DA&sol;DAD and BT-
S1415DA&sol;DAD 
9 Schematic Diagram 
9.1 W-P.C.Board 
9.2 A-P.C.Board(1&sol;2) 
9.3 A-P.C.Board(2&sol;2) 
9.4 B-P.C.Board(1&sol;2) 
9.5 B-P.C.Board(2&sol;2) 
10 Circuit Boards 
10.1 A-P.C.Board 
10.2 B-P.C.Board&sol; W-
P.C.Board(Foil Side) 
10.3 B-P.C.Board (Component Side) 
Y&sol;S&sol;T&sol;N&sol; Board(Foil 
Side) 
11 Exproded Views   
12 Replacement Parts List 
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PV

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1 Safety Precautions

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1.1 General Guidelines

1.2 Leakage Current Cold Check

1.3 Leakage Current Hot Check

1.4 X-Radiation

1.5 Horizontal Osc. Disable Circuit Test

1.6 Repair Procedure of Horizontal Osc. Disable Circuit

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1.1 General Guidelines

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It is advisable to insert an isolation transformer in the power line and AC supply before servicing a hot

chassis.

When servicing this monitor, 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.

After the service, check that all the protective devices such as insulation barriers, insulation papers,

shields, and isolation R-C combinations are properly installed.

Before turning the monitor on, measure the resistance between B+ Iine and chassis ground. Connect

the "-" side of an ohmmeter to each B+ Iine, and the "+" side to chassis ground. The resistance of each

line must behigher than specified as follows:

When the monitor is not used for a long period of time, unplug the power cord from the AC outlet.

High voltage points, as high as 23.5 kV, are present when this monitor is in operation. Operating the

monitor without the rear cover involves you in a dangerous electric shock from the monitor power

supply. Servicing must not be attempted byanyone who is not thoroughly familiar with the necessary

precautions when working on high voltage equipment. Always discharge the anode of the picture tube

to the chassis ground before handling the picture tube.

After the service, make the following leakage current checks to prevent the customer from getting an

electric shock.

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1.2 Leakage Current Cold Check

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1. Unplug the AC power cord and connect a jumper wire between the two prongs of the AC plug.

2. Set the power switch of this monitor to the ON position.

3. Measure the resistance with an ohmmeter between the prongs of the AC plug and each exposed

metallic cabinet part on the monitor such as screw heads, connectors, and control shafts. When

the exposed metallic part has a return path to the chassis,the ohmmeter should read between 5

MΩ and 15 MΩ. When the exposed metallic part does not have a return path to the chassis, the

reading must be infinity.

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1.3 Leakage Current Hot Check

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1. Plug the AC power cord directly into the AC outlet. Do not use an isolation transformer for

this check.

2. Connect the test jig shown in Fig.1 between each exposed metallic part on the monitor and an

earth ground such as a water pipe.

3. Use an AC voltmeter having high impedance (1 kΩ/V or higher) to measure the voltage.

4. Measure the voltage at each exposed metallic part.

5. The voltage at any point must be less than 0.25 V[rms].

6. A Ieakage current tester (Simpson Model 228 or equivalent) may be used to make the hot

checks. In this case, the current must be less than 0.5 mA.

7. If the reading is outside of the specified limit, the monitor must be repaired and rechecked

before it is returned to the customer because of a possibility of an electric shock.

Fig.1

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1.4 X-Radiation

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Warnings:

The potential sources of X-Radiation in the monitor are the high voltage section and the picture tube.

When using a picture tube test jig for service, check that the jig is capable of handling 28.5 kV

without causing X-Radiation.

Note:

It is important to use an accurate, periodically calibrated high-voltage meter (electrostatic type).

1. Turn the BRIGHT and CONTRAST controls counterclockwise fully.

2. Check that the high voltage is 23.5 kV±1.5 kV. If not, immediate service and correction is

required to prevent a possibility of premature component failure.

3. To prevent an X-Radiation possibility, it is essential to use the specified picture tube.

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