Service Manuals, User Guides, Schematic Diagrams or docs for : BELSON TV BSV-29251 BELSON BSV29251

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BELSON BSV29251


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C.E.C BELSON/DPTO.TECNICO/MOD:BSV-29251/Ed.01




                        Belson
                              SERVICE

                          MANUAL

                       BSV-29251
                                           CONTENTS
SAFETY INSTRUCTION AND PRODUCT SAFETY NOTICE...................................1
X-RAY RADIATION PRECAUTION...............................................................1
SAFETY PRECAUTION.............................................................................1
PRODUCT SAFETY NOTICE......................................................................2
ALIGNMENT PROCEDURE......................................................................3
TEST EQUIPMENT ..............................................................................3
ALIGNMENT INSTRUCTION..........................................................................3
B+ CONFIRM................................................................................................3
AGC ALIGNMENT..........................................................................................4
SOUND CHECK.............................................................................................4
FOCUS POTENTIOMETER ADJUSTMENT.........................................................4
H-CENTER ADJUSTMENT..............................................................................4
V-SIZE, VERTICAL S-CORRECTION, V-CENTER, H-SIZE, E/W CORRECTION
ADJUSTMENT.......................................................................................4
SCREEN-GRID VOLTAGE VG2 ADJUSTMENT................................................4
WHITE BALANCE ADJUSTMENT(AUTO DARK BALANCE).................................4
LUMINANCE/CHROMA TIME DELAY ADJUSTMENT..........................................5
HIGH VOLTAGE AND FILAMENT VOLTAGE CHECK..........................................5
X-RAY PROTECTION CHECK........................................................................5
BEAM CURRENT CHECK..............................................................................5
AV FUNCTION CHECK.................................................................................5
OUT-FACTORY STATUS SETTING..................................................................5
APPENDIX 1................................................................................................6
APPENDIX 2................................................................................................8
WIRING DIAGRAM..................................................................................9
BLOCK DIAGRAM....................................................................................10
IC BLOCK DIAGRAM................................................................................11
SCHEMATIC DIAGRAM............................................................................15
ELECTRICAL PARTS LIST........................................................................16




                                                    1
    CAUTION: THIS SERVICE MANUAL IS ONLY FOR PROFESSIONAL SERVICE PERSONNEL'S
                 REFERENCE.         BEFORE      SERVICING       THIS     CHASSIS,      PLEASE      READ      THE
                 FOLLOWING NOTICE ITEMS.



1.     SAFETY INSTRUCTION AND PRODUCT SAFETY NOTICE
    Before servicing and aligning this equipment, please read the following "X-RAY RADIATION
    PRECAUTION" ,"SAFETY             PRECAUTION" and "PRODUCT SAFETY NOTICE".


1.1 X-RAY RADIATION PRECAUTION
1    Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards,
     the high voltage must not be above the specified limit. The normal value of the high voltage of this
     receiver is: 26.5kV(25") at 1.3mA beam current; 29kV(29" super flat) at 1.4mA beam current; 30kV(29"
     pure flat) at 1.4mA beam current.        The high voltage must not, under any circumstances, exceed
     31kV(25")/33kV(29")/35kV(29" pure flat).
2    Each time a receiver requires servicing, the high voltage should be checked following the HIGH
     VOLTAGE CHECK procedure in this manual. It is recommended the reading of the high voltage be
     recorded as a part of service record. It is important to use an accurate and reliable high voltage meter.
3    The primary source of X-RAY RADIATION in this TV receiver is the picture tube. For continuous X-RAY
     RADIATION protection, the replacement tube must be exactly the same type tube as specified in the parts
     list.
4    Some parts in this receiver have special safety-related characteristics for X-RAY RADIATION protection.
     For continuous safety, parts replacement should be undertaken only after referring to the PRODUCT
     SAFETY NOTICE below.

1.2 SAFETY PRECAUTION
WARNING:
Service should not be attempted by anyone unfamiliar with the necessary precaution on this receiver. The
following are the necessary precautions to be observed before servicing this chassis.
1) Since the power supply circuit of this receiver is directly connected to the AC power line, an isolation
     transformer should be used during any dynamic service to avoid possible shock hazard.
2) Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube.
     The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter
     proof goggles and keep picture tube away from the unprotected body while handling.
3) When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in
     place, such as: non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network
     etc.
4) When replacing parts or circuit boards, disconnect the power cord.
5) When replacing a high wattage resistor (oxiode metal film resistor) on the circuit board, keep the resistor
     10mm (1/2in) away from circuit board.

                                                          1
6) Connection wires must be kept away from components with high voltage or high temperature.
7) If any fuse in this TV receiver is blown, replace it with the FUSE specified in the chassis parts list.
8) Before returning the set to your customer, always perform an AC leakage current check on the exposed
   metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to
   be sure the set is safe to operate without danger of electrical shock. Plug the AC power cord into a 220V
   AC outlet (do not use a line isolation transformer during this check). Use an AC voltmeter having 5000
   ohms per volt or more sensitivity in the following manner:
   Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15



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