Panasonic BT-S1315DA User manual
bt_s1415.html
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/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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4.5 Notes
4.6 Switching between USER and
FACTORY Modes
4.7 Purity Adjustment
4.7.1 Equipment to be used
4.7.2 Adjustment Procedure
4.8 Convergence Adjustment
4.8.1 Equipment to be used
4.8.2 Adjustment Procedure
4.9 Deflection Adjustment and
Check
4.9.1 Equipment to be used
4.9.2 Initial Settings
4.9.3 Adjustment Procedure
4.10 Cut Off Adjustment
4.10.1 Equipment to be used
4.10.2 Initial Settings
4.10.3 Adjustment Procedure
4.11 Contrast Adjustment
4.11.1 Equipment to be used
4.11.2 Initial Settings
4.11.3 Adjustment Procedure
4.12 NTSC Color Output
Adjustment
4.12.1 Equipment to be used
4.12.2 Initial Settings
4.12.3 Adjustment Procedure
4.13 White Balance Adjustment
4.13.1 Equipment to be used
4.13.2 Initial Setting
© 2000 Matsushita Electric Industrial Co., Ltd./All rights reserved. Unauthorized copying and distribution is a violation of law.
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4.13.3 Preparations
4.13.4 6500K Adjustment
4.13.5 9300K Adjustment
4.14 SECAM Black Level
Adjustment
4.14.1 Equipment to be used
4.14.2 Initial Settings
4.14.3 Adjustment Procedure
4.15 Brightness and ABL
Adjustment
4.15.1 Equipment to be used
4.15.2 Initial Settings
4.15.3 Adjustment Procedure
4.16 Focus Adjustment
4.16.1 Equipment to be used
4.16.2 Initial Settings
4.16.3 Adjustment Procedure
4.17 C/Y Output Adjustment
(BT-S1315DAD/S1415DAD only)
4.17.1 Equipment to be used
4.17.2 Adjustment Procedure
4.18 X-radiation Protection Circuit
Adjustment
4.18.1 Equipment to be used
4.18.2 Initial Settings
4.18.3 Adjustment Procedure
5 Troubleshooting
5.1 The power is not turned on
5.2 No raster appears
5.3 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/DAD and BT-
S1415DA/DAD
9 Schematic Diagram
9.1 W-P.C.Board
9.2 A-P.C.Board(1/2)
9.3 A-P.C.Board(2/2)
9.4 B-P.C.Board(1/2)
9.5 B-P.C.Board(2/2)
10 Circuit Boards
10.1 A-P.C.Board
10.2 B-P.C.Board/ W-
P.C.Board(Foil Side)
10.3 B-P.C.Board (Component Side)
Y/S/T/N/ Board(Foil
Side)
11 Exproded Views
12 Replacement Parts List
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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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1.5 Horizontal Osc. Disable Circuit Test
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This test must be made as a final check before the monitor is returned to the customer./Fig. 2 shows
the horizontal osc. disable circuit.
1. With the rear cover removed, supply nominal 120 V AC for BT-S1315DA/DAD or 220 V AC
for BT-S1415DA/DAD to the monitor and turn the power on.
2. Set the customer controls to normal operating positions.
3. Input a monoscope pattern signal.
4. Short R571 with a 10 kΩ jumper wire.
5. Check that the high voltage vanishes, the raster stops, and the AC power supply voltage is 120
V for BT-S1315DA/DAD or 220 V for BT-S1415DA/DAD.
6. If these do not occur, the horizontal osc. disable circuit is not operating properly. Repair this
circuit according to the following procedure before returning the monitor to the customer.
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1.6 Repair Procedure of Horizontal Osc.
Disable Circuit
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1. Connect a DC voltmeter between the "+" side of C550 and a chassis ground. If the voltmeter
does not read nearly 20 V, check R569, D520, C550, R571 and R573.
2. Connect the "+" side of the DC voltmeter to the collector of Q803 and the "-" side to TPA4
(GND). The collector voltage of Q803 changes from nearly 11 V to 0.1 V when R571 is
shorted by 10 kΩ jumper. If this does not occur, checkQ518, C568, R581, Q515, C558, R574,
R575, Q514, C551, R570, D521, C554, C555, D524, R576, R582, R590, R577, C564, R591,
C562, Q517, D526, R579, D509, R571, R573, C550, D520, R569, R836, R835, C837, Q803,
D818, R834 and D823.
3. Carefully check the above specified parts and the related circuits and parts. When the circuit
has been repaired, make the horizontal osc. disable circuit test again.
Fig.2
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2 Disassembly Instructions
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Warnings:
Be sure to unplug the AC power cord from the AC power outlet before disassembling this monitor.
Cautions:
When turning over a printed circuit board, be sure to put a insulating material under it to prevent a
short circuit.
Printed circuit boards and wires must not be pulled forcibly, but be handled carefully.
Connectors also must be handled carefully.
After repairing this monitor, be sure to put back the wires and connectors to the original conditions.
When removing the rear panel, take care not to damage the neck of the picture tube.
Note:
After replacing any P.C. Board with a new one, be sure to check the picture quality. If there is a
problem, adjust the items related to its problem according to the chapter "Measurements and
Adjustments".
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/S1415DAD only)
2.5 Removal of B- andW-P.C.Boards
2.6 Removal of A-P.C.Board
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2.1 Printed Circuit Board Layout
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2.2 Removal of Top Cabinet
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1. Unscrew the 4 screws fixing the cabinet./(2 screws per side)
2. Unscrew the 6 screws fixing the cabinet.
3. After sliding the cabinet roughly 5 mm backward, lift it off while opening its bottom portions
approx. 10 mm.
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2.3 Removal of Rear Cover
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1. Unscrew the 6 screws fixing the rear cover.
2. Remove the rear cover backward.
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2.4 Removal of DS-P.C.Board (for BT-
S1315DAD/S1415DAD only)
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1. Remove the top cabinet according to the section 2.2."Removal of Top Cabinet".
2. Remove the rear cover according to the section 2.3. "Removal of Rear Cover".
3. Disconnect the wires connected from other P.C.Boards to DS-P.C.Board.
4. Unscrew the 4 screws and remove the SDI pack.
5. Unscrew the 4 screws and remove the SDI shield case.
6. Unscrew the 4 screws and remove the DS-P.C.Board.
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