Colour Television |
Chassis |
L9.2A
AA
CL 96532047_013.eps
270599
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Contents |
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1. |
Technical Specifications |
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2. |
Safetyand maintenance instructions, |
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warnings and notes. |
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3. |
Directions for use |
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4. |
Mechanical instructions |
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5. |
Service modes, faultfinding and repair tips |
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6. |
Faultfinding trees |
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Supply voltage diagram |
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Blockdiagram |
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Testpointsoverview and oscillograms |
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7. |
Electrical diagram’s en PWB’s |
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Diagram PWB |
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Power supply |
(Diagram A1) |
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34/37 |
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Diversity table A1 |
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Horizontal deflection |
(Diagram A2) |
30 |
34/37 |
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Vertical deflection |
(Diagram A3) |
31 |
34/37 |
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Synchronisation |
(Diagram A4) |
31 |
34/37 |
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Tuner en video IF (TDA 8844) |
(Diagram A5) |
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34/37 |
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Diversity table A5 |
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Video processing |
(Diagram A6) |
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34/37 |
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Control |
(Diagram A7) |
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34/37 |
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Front control |
(Diagram A8) |
40 |
34/37 |
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Smart sound & mono amplifier |
(Diagram A10) |
41 |
34/37 |
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Front cinch and headphone |
(Diagram A11) |
42 |
34/37 |
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Rear IO Cinches |
(Diagram A12) |
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34/37 |
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CRT Panel |
(Diagram B) |
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BTSC decoder |
(Diagram C1) |
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BTSC Audio amplifier |
(Diagram C2) |
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48 |
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ITT Audio decodering |
(Diagram D1) |
49 |
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ITT Audio amplifier |
(Diagram D2) |
50 |
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Side AV panel |
(Diagram E) |
51 |
51 |
8. |
Alignments |
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53 |
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9. |
Circuit description new circuits and |
56 |
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list of abbreviations |
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61 |
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10. |
Spareparts list |
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64 |
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Copyright reserved 1999 Philips Consumer Electronics B.V. Eindhoven, The Netherlands. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.
Published by JvR 9965 Service PaCE |
Printed in the Netherlands |
Subject to modification |
54822 727 21705 |
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GB 2 |
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1. |
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L9.2A |
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Technical Specifications |
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1. |
Technical Specifications |
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1.1 |
Specifications |
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Off air |
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100dBV |
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On air |
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90dBV |
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Mains voltage |
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150V - 276Vac; |
Audio output |
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• Stereo : 2 * 3W; 2 * 1W |
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Mains frequency |
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50 - 60Hz |
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• Mono : 2 * 2W; 4W; 3W; 2W; 1W |
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Maximum power consumption |
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•14" : 40W +/- 10%
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20" : 56W |
+/- 10% |
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Tuners |
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UV 1316/AI-2 (PAL) |
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21" : 58W |
+/- 10% |
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UV 1316/AIU-2 (PAL) |
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Standby power consumption |
: 10W +/- 10% |
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UV 1356C/AI (PAL) |
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Max. Antenne-input |
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1.2Specification of the terminal sockets
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IR |
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+ - |
+ |
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Volume Channel |
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Red |
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CL 86532104_011.eps |
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080299 |
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Video |
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S-Video |
L |
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Audio |
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R |
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IN IN OUT |
CL 86532104_069.AI 290399
1.3Specification of the terminal sockets
1.3.1Inputs (AV1, AV2 and Side AV)
- Cinch |
CVBS (yellow) (1Vpp +/- 3dB 75Ω) |
q |
- Cinch |
Audio R (red) (0.2-2VRMS 10kΩ) |
q |
- Cinch |
Audio L (white) (0.2-2VRMS 10kΩ) |
q |
1.3.2Outputs (MONITOR out)
- Cinch |
CVBS (yellow) (1Vpp +/- 3dB 75Ω) |
q |
- Cinch |
Audio R (red) (0.5VRMS < 1kΩ) |
q |
- Cinch |
Audio L (white) (0.5VRMS < 1kΩ) |
q |
1.3.3Headphone
- Jack |
8-600 (4mW) |
t |
1.3.4SVHS
1 |
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Ground |
v |
2 |
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Ground |
v |
3 |
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Y (1Vpp +/- 3dB 75Ω) |
p |
4 |
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C (0.3Vpp +/- 3dB 75Ω) |
p |
Safety instructions, maintenance instruction, warnings and Notes |
L9.2A |
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2. |
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GB 3 |
1.4PCB location drawing
E |
SIDE AV PANEL |
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CRT PANEL |
B |
D1 ITT AUDIO DECODING |
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AUDIO PANEL |
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D2 |
ITT AUDIO AMPLIFIER |
POWER SUPPLY |
A1 |
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MAIN |
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OR |
LINE DEFLECTION |
A2 |
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C1 |
BTSC DECODER |
FRAME DEFLECTION |
A3 |
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C2 |
AUDIO AMPLIFIER |
SYNCHRONISATION |
A4 |
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TUNER VIDEO IF |
A5 |
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VIDEO PROCESSING |
A6 |
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CONTROL |
A7 |
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FRONT CONTROL |
A8 |
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SMART SOUND + |
A10 |
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MONO SOUND AMPLIFIER |
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FRONT CINCH + |
A11 |
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HEADPHONE |
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REAR I/O CINCHES |
A12 |
CL 96532047_014.eps
270599
2. Safety instructions, maintenance instruction, warnings and Notes
2.1Safety instructions for repairs h?????????
1.Safety regulations require that during a repair:
–The set should be connected to the mains via an isolating transformer;
–Safety components, indicated by the symbol h, should be replaced by components identical to the original ones;
–When replacing the CRT, safety goggles must be worn.
2.Safety regulations require that after a repair the set must be returned in its original condition. In particular attention should be paid to the following points.
–As a strict precaution, we advise you to resolder the solder joints through which the horizontal deflection current is flowing, in particular ('general repair instruction'):
•All pins of the line output transformer (LOT);
•Fly-back capacitor(s);
•S-correction capacitor(s);
•Line output transistor;
•Pins of the connector with wires to the deflection coil;
•Other components through which the deflection current flows.
•Note:
•This resoldering is advised to prevent bad connections due to metal fatigue in solder joints and is therefore only necessary for television sets older than 2 years.
–The wire trees and EHT cable should be routed correctly and fixed with the mounted cable clamps.
–The insulation of the mains lead should be checked for external damage.
–The mains lead strain relief should be checked for its function in order to avoid touching the CRT, hot components or heat sinks.
–The electrical DC resistance between the mains plug and the secondary side should be checked (only for sets which have a mains isolated power supply). This check can be done as follows:
•Unplug the mains cord and connect a wire between the two pins of the mains plug;
•Set the mains switch to the "on" position (keep the mains cord unplugged!);
•Measure the resistance value between the pins of the mains plug and the metal shielding of the tuner
or the aerial connection on the set. The reading should be between 4.5 MΩ and 12 MΩ
•Switch off the TV and remove the wire between the two pins of the mains plug.
–The cabinet should be checked for defects to avoid touching of any inner parts by the customer.
2.2Maintenance instruction
It is recommended to have a maintenance inspection carried out by a qualified service employee. The interval depends on the usage conditions:
–When the set is used under normal circumstances, for example in a living room, the recommended interval is 3 to 5 years.
–When the set is used in circumstances with higher dust, grease or moisture levels, for example in a kitchen, the recommended interval is 1 year.
–The maintenance inspection contains the following actions:
•Execute the above mentioned 'general repair instruction'.
GB 4 |
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2. |
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L9.2A |
Safety instructions, maintenance instruction, warnings and Notes |
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• Clean the power supply and deflection circuitry on the |
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chassis. |
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• Clean the picture tube panel and the neck of the picture |
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tube. |
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2.3 |
Warnings |
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1. ESD w |
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2. All ICs and many other semiconductors are susceptible to |
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electrostatic discharges (ESD). Careless handling during |
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repair can reduce life drastically. When repairing, make |
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sure that you are connected with the same potential as the |
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mass of the set by a wristband with resistance. Keep |
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components and tools also at this same potential. |
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3. Available ESD protection equipment: |
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– Complete kit ESD3 (small table mat, Wristband, |
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Connection box, Extension cable and Earth cable) |
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4822 310 10671 |
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– Wristband tester 4822 344 13999 |
Figure 2-1 |
4.In order to prevent damage to ICs and transistors, all highvoltage flashovers must be avoided. In order to prevent damage to the picture tube, the method shown in Fig. 2.1 should be used to discharge the picture tube. Use a highvoltage probe and a multimeter (position DC-V). Discharge until the meter reading is 0V (after approx. 30s).
5.Together with the deflection unit and any multipole unit, the flat square picture tubes used form an integrated unit. The deflection and the multipole units are set optimally at the factory. Adjustment of this unit during repair is therefore not recommended.
6.Be careful during measurements in the high-voltage section and on the picture tube.
7.Never replace modules or other components while the unit is switched on.
8.When making settings, use plastic rather than metal tools. This will prevent any short circuits and the danger of a circuit becoming unstable.
9.Wear safety goggles during replacement of the picture tube.
CL 26532098/042 140792
2.4Notes
The direct voltages and oscillograms should be measured with regard to the tuner earth (v), or hot earth (u) as this is called. The direct voltages and oscillograms shown in the diagrams are indicative and should be measured in the Service Default Mode (see chapter 8) with a colour bar signal and stereo sound (L:3 kHz, R:1 kHz unless stated otherwise) and picture carrier at 475.25 MHz.
Where necessary, the oscillograms and direct voltages are measured with (D) and without aerial signal (E). Voltages in the power supply section are measured both for normal operation (G) and in standby (F). These values are indicated by means of the appropriate symbols.
The picture tube PWB has printed spark gaps. Each spark gap is connected between an electrode of the picture tube and the Aquadag coating.
The semiconductors indicated in the circuit diagram and in the parts lists are completely interchangeable per position with the semiconductors in the unit, irrespective of the type indication on these semiconductors.
Directions for use |
L9.2A |
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3. |
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GB 5 |
3. Directions for use
GB 6 |
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3. |
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L9.2A |
Directions for use |
Directions for use |
L9.2A |
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3. |
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GB 7 |
GB 8 |
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3. |
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L9.2A |
Directions for use |
Directions for use |
L9.2A |
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3. |
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GB 9 |
GB 10 |
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3. |
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L9.2A |
Directions for use |
Directions for use |
L9.2A |
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3. |
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GB 11 |
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