Panasonic CT-32D20B Technical Service Data

Also see for CT32D20B - 32" COLOR TV: Operating manual

Panasonic CT-32D20B Technical Service Data Manual pdf 1 page image

SAFETY PRECASAFETY PRECASAFETY PRECASAFETY PRECASAFETY PRECAUTIONSUTIONSUTIONSUTIONSUTIONSINDEXINDEXINDEXINDEXINDEXSET 4554SET 4554SET 4554SET 4554SET 4554MODEL CTMODEL CTMODEL CTMODEL CTMODEL CT-32D20B (CHASSIS AP341)-32D20B (CHASSIS AP341)-32D20B (CHASSIS AP341)-32D20B (CHASSIS AP341)-32D20B (CHASSIS AP341)PPPPPANASONICANASONICANASONICANASONICANASONICHorizontal Oscillator Disable Test ......... 1IC Functions ........................................... 1Important Parts Information ................... 1Miscellaneous Adjustments .................... 1Parts List ................................................. 4Placement Chart ..................................... 1Safety Precautions .................................. 1Schematic Component Location ............ 2Schematic Notes ..................................... 1SchematicsAudio ............................................... 3PIP ................................................... 4Power Supply .................................. 2System Control ................................ 2Television ........................................ 2Video ............................................... 3Test Equipment ....................................... 1Tuner Information .................................. 1For Supplier AdFor Supplier AdFor Supplier AdFor Supplier AdFor Supplier Address,dress,dress,dress,dress,See PHOSee PHOSee PHOSee PHOSee PHOTTTTTOFOFOFOFOFAAAAACT AnnCT AnnCT AnnCT AnnCT Annual Indeual Indeual Indeual Indeual IndexxxxxMARCHMARCHMARCHMARCHMARCH 2002 SET 45542002 SET 45542002 SET 45542002 SET 45542002 SET 4554PPPPPANASONICANASONICANASONICANASONICANASONICModel CTModel CTModel CTModel CTModel CT-32D20B (Chassis AP341)-32D20B (Chassis AP341)-32D20B (Chassis AP341)-32D20B (Chassis AP341)-32D20B (Chassis AP341)4554Technical Service DataSERSERSERSERSERVICEVICEVICEVICEVICE WARNINGWARNINGWARNINGWARNINGWARNINGOnly qualified service technicians who are familiar with safety checksand guidelines should perform service work. Before replacing parts,disconnect power source to protect electrostatically sensitive parts. Donot attempt to modify any circuit unless so recommended by themanufacturer. When servicing the receiver, use an isolation transformerbetween the line cord and power receptacle.SERSERSERSERSERVICINGVICINGVICINGVICINGVICING THE HIGHTHE HIGHTHE HIGHTHE HIGHTHE HIGH VVVVVOLOLOLOLOLTTTTTAAAAAGE AND CRGE AND CRGE AND CRGE AND CRGE AND CRTTTTTUse EXTREME CAUTION when servicing the high voltage circuits. Todischarge static high voltage, connect a 10K ohms resistor in series with atest lead between the receiver ground and CRT anode lead. DO NOT liftthe CRT by the neck. Always wear shatterproof goggles when handlingthe CRT to protect eyes in case of implosion.X-RAX-RAX-RAX-RAX-RAY RADIAY RADIAY RADIAY RADIAY RADIATION AND HIGHTION AND HIGHTION AND HIGHTION AND HIGHTION AND HIGH VVVVVOLOLOLOLOLTTTTTAAAAAGE LIMITSGE LIMITSGE LIMITSGE LIMITSGE LIMITSBe aware of the instructions and procedures covering X-ray radiation. Insolid-state receivers and monitors, the CRT is the only potential source ofX-rays. Keep an accurate high voltage meter available at all times. Checkmeter calibration periodically. Whenever servicing a receiver, check thehigh voltage at various brightness levels to be sure it is regulatingproperly. Keep high voltage at rated value, NO HIGHER. Excessive highvoltage may cause X-ray radiation or failure of associated components.DO NOT depend on protection circuits to keep voltage at rated value.When troubleshooting a receiver with excessive high voltage, avoid closecontact with the CRT. DO NOT operate the receiver longer thannecessary. To locate the cause of excessive high voltage, use a variableAC transformer to regulate voltage. In present receivers, many electricaland mechanical components have safety related characteristics which arenot detectable by visual inspection. Such components are identified by a##### on both the schematic and the parts list. For SAFETY, use onlyequivalent replacement parts when replacing these components.GENERAL GUIDELINESGENERAL GUIDELINESGENERAL GUIDELINESGENERAL GUIDELINESGENERAL GUIDELINESPerform a final SAFETY CHECK before returning receiver to customer.Check repaired area for poorly soldered connections, and check entirecircuit board for solder splashes. Check board wiring for pinched wires orwires contacting any high wattage resistors. Check that all control knobs,shields, covers, grounds, and mounting hardware have been replaced. Besure to replace all insulators and restore proper lead dress.SAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARDCold LeakaCold LeakaCold LeakaCold LeakaCold Leakaggggge Chece Chece Chece Chece Checks fks fks fks fks for Receiveror Receiveror Receiveror Receiveror Receivers with Isolated Grs with Isolated Grs with Isolated Grs with Isolated Grs with Isolated GroundoundoundoundoundUnplug the AC cord, connect a jumper across the plug prongs, and turnthe power switch on (if applicable). Use an ohmmeter to measure theresistance between the jumped AC plug and any exposed metal cabinetparts such as antenna screw heads, control shafts, or handle brackets.Exposed metal parts with a return path should measure between 1Mohms and 5.2M ohms. Parts without a return path must measure infinity.Hot LeakaHot LeakaHot LeakaHot LeakaHot Leakaggggge Current Chece Current Chece Current Chece Current Chece Current CheckkkkkPlug the AC cord directly into an AC outlet. DO NOT use an isolationtransformer. Use a 1500 ohms, 10W resistor in parallel with a .15μFcapacitor to connect between any exposed metal parts on the receiver anda good earth ground. (See figure below.) Use an AC voltmeter with atleast 5000 ohms per volt sensitivity to measure the voltage across theresistor. Check all exposed metal parts and measure voltage at each point.Voltage measurements should not exceed .75VAC, 500μA. Any valueexceeding this limit constitutes a potential shock hazard and must becorrected. If the AC plug is not polarized, reverse the AC plug and repeatexposed metal part voltage measurement at each point.The listing of any available replacement part herein in no case constitutes a recommendation, warranty, or guarantee bySAMS Technical Publishing as to the quality and suitability of such replacement part. The numbers of the listed parts havebeen compiled from information furnished to SAMS Technical Publishing by the manufacturers of the specific type ofreplacement part listed.Reproduction or use, without express permission, of editorial or pictorial content, in any manner, is prohibited. No patentliability is assumed with respect to the use of the information contained herein.© 20025436 West 78th StreetIndianapolis, IN 46268-4149Printed in the United States of America 5 4 3 2 1 02PF01922PPPPPaaaaaggggge 1e 1e 1e 1e 1 SET 4554SET 4554SET 4554SET 4554SET 455445544554Essential coEssential coEssential coEssential coEssential coveraveraveraveraveragggggeeeeefffffor seror seror seror seror servicing a televicing a televicing a televicing a televicing a television receivervision receivervision receivervision receivervision receiver...............• ScScScScSchematicshematicshematicshematicshematics• Component locationsComponent locationsComponent locationsComponent locationsComponent locations• PPPPParararararts listts listts listts listts listRepresentative ModelUPCHEREHORIZONTHORIZONTHORIZONTHORIZONTHORIZONTAL OSCILLAAL OSCILLAAL OSCILLAAL OSCILLAAL OSCILLATTTTTOR DISABLEOR DISABLEOR DISABLEOR DISABLEOR DISABLE TESTTESTTESTTESTTESTPlace a jumper between pins 3 and 4 of IC803. Apply 9.0V to the cathode of D001. Connect ahigh voltage probe to the CRT anode. Set the AC supply to 45VAC. Turn the receiver on andslowly increase the AC supply. Confirm the high voltage does not exceed 37.1kV when thehorizontal just begins to pull out of sync. If the high voltage should exceed 37.1kV or thereceiver fails to lose horizontal sync, the horizontal oscillator disable circuit should be repaired.Remove jumper and the 9.0V DC supply.Coverage includes these additional models and chassis:ModelsModelsModelsModelsModels ChassisChassisChassisChassisChassisCT-32D20UB AP341CT-32D30B BP341CT-32D30CB BP341CT-32D30UB BP341