PRACTICAL SERVICE PRECAUTIONS
IT MAKES SENSE TO AVOID EXPOSURE TO ELECTRICAL SHOCK.
While some sources are
expected to have a possible dangerous impact, others of quite high potential are of limited current and are
sometimes held in less regard.
ALWAYS RESPECT VOLTAGES.
While some may not be dangerous in themselves, they can cause
unexpected reactions – reactions that are best avoided. Before reaching into the powered color TV set, it is
best to test the high voltage insulation. It is easy to do, and is just a good service precaution.
BEFORE POWERING UP THE TV WITH THE BACK OFF
(or on a test fixture), attach a clip lead to
the CRT DAG ground and to a screwdriver blade that has a well insulated handle. After the TV is powered
on and high voltage has developed, probe the anode lead with the blade, starting at the bottom of the High
Voltage Transformer (flyback – IFT). Move the blade to within two inches of the connector of the CRT.
IF
THERE IS AN ARC, YOU FOUND IT THE EASY WAY, WITHOUT GETTING A SHOCK!
If
there is an arc to the screwdriver blade, replace the High Voltage Transformer or the lead, (if removable)
whichever is causing the problem.
PICTURE TUBE REPLACEMENT PROCEDURE
Note: a. Two (2) people are required to handle this picture tube.
b. Safety Glasses must be worn during this procedure or whenever directly handling a picture tube.
c. Take care in each step not to damage the CRT or the cabinet.
1. Remove the Chassis and the CRT Socket Board Module from the cabinet.
2. A furniture pad or blanket should be positioned on the floor to support only the CRT Face. This pad or
blanket should be high enough to keep the CRT Face approximately 12 to 14 inches off the floor.
3. Using two people, place the cabinet in a front down position with the CRT Face on the pad or blanket.
4. Place padded blocks under each corner of the cabinet to keep it from rocking.
5. Remove the four screws, at the corners of the CRT.
6. With two people lowering the cabinet to the floor, leave the CRT elevated by the pad or blanket.
Note: Take care not to grasp the neck of the CRT during this procedure, as it is extremely fragile.
7. Two (2) people may then lift the CRT from the cabinet.
8. Remove the degaussing coil from the defective CRT and mount on the replacement. Take care to
maintain the exact shape and fit.
To install the new CRT, reverse steps 1 to 7.
Содержание 7629
Страница 1: ......
Страница 5: ......
Страница 14: ...AV2 In SVHS Connector Kind Value Symbol 1 gnd v 2 gnd v 3 Y 1 Vpp 75 O j 4 C 0 3 Vpp 75 O j ...
Страница 16: ...Figure ...
Страница 18: ...Figure ...
Страница 20: ...Figure Panel Removal 1 Lift the board out of its bracket after releasing the 2 fixation clamps Figure ...
Страница 48: ...Hardware Alignments Figure Mono Carrier Top View LS ...
Страница 76: ...Power Supply Figure Figure ...
Страница 101: ...T8 7629 ...
Страница 102: ...T8 7629 ...
Страница 103: ...T8 7629 ...
Страница 104: ...T8 7629 ...
Страница 105: ...All Models 7629 PCB Locations ...
Страница 106: ...All Models 7629 Power Supply Diagram A1 ...
Страница 107: ...All Models 7629 Line Deflection Diagram A2 ...
Страница 108: ...All Models 7629 Frame Deflection Diagram A3 ...
Страница 109: ...All Models 7629 Tuner IF Diagram A4 ...
Страница 110: ...All Models 7629 Video IF And Sound IF Diagram A5 ...
Страница 111: ...All Models 7629 Synchronization Diagram A6 ...
Страница 112: ...All Models 7629 Control Diagram A7 ...
Страница 113: ...All Models 7629 Audio Amplifier Diagram A8 ...
Страница 114: ...All Models 7629 BTSC Stereo SAP Decoder Diagram A9 ...
Страница 115: ...All Models 7629 Audio Video Source Switching Diagram A10 ...
Страница 116: ...All Models 7629 BTSC NDBX Stereo Decoder Diagram A11 ...
Страница 117: ...All Models 7629 Front I O Control Headphone Diagram A12 ...
Страница 118: ...All Models 7629 Rear I O Cinch Diagram A13 ...
Страница 119: ...All Models 7629 PIP Interface Diagram A16 ...
Страница 120: ...All Models 7629 CRT Panel Diagram B1 ...
Страница 122: ...USED ONLY IN MODELS 27PS50B321 32PS55S321 32PS61S321 32PS55S331 7629 Side AV and Headphone Panel Diagram E1 ...
Страница 123: ...USED ONLY IN MODELS 27PS60S321 27RF72S325 32PS61S321 7629 PIP Panel Diagram P ...
Страница 125: ...USED ONLY IN MODELS PC0125C321 PC0127C321 7629 EPS Panel Schematic ...
Страница 126: ...USED ONLY IN MODELS PC0125C321 PC0127C321 7629 Card Interface Schematic ...
Страница 127: ...USED ONLY IN MODELS PC0125C321 PC0127C321 PL0125C321 PLW225S321 PRF227S325 7629 SP LS Panel Schematic ...
Страница 128: ...All Models 7629 Main Panel component side ...
Страница 129: ...All Models 7629 Main Panel copper side ...
Страница 130: ...All Models 7629 CRT Panel component side ...
Страница 131: ...All Models 7629 CRT Panel copper side ...
Страница 132: ...All Models 7629 Headphone Panel component side ...
Страница 133: ...All Models 7629 Side AV Panel component side ...
Страница 134: ...All Models 7629 PIP panel component side ...
Страница 135: ...All Models 7629 PIP panel copper side ...
Страница 136: ...All Models 7629 Top Control Panel component side ...
Страница 137: ...All Models 7629 EPS Panel PCB Top View only ...
Страница 138: ...All Models 7629 Card Interface Panel PCB Top View ...
Страница 139: ...All Models 7629 Card Interface Panel PCB Bottom View ...
Страница 140: ...MAIN CABINET EXPLODED VIEW ...