DAEWOO chassis CN-201A(B) free download

File name DAEWOO chassis CN-201A(B).pdf

Service Manual Color Television MODEL: CN-201A/B NTSC-M SYSTEM DTQ-14Q1FS, DTQ-14Q2TS DTQ-14Q3FS, DTQ-14T1AS DTQ-14T2FS, DTQ-20Q1FS DTQ-20Q2FS, DTQ-20Q3FS DTQ-20T1AS, DTQ-20T2AS DTQ-20T1FS, DTQ-20T2FS DTQ-20T3FS, DTQ-21T1FS DTQ-21T2FS, DTQ-21T5FS DTQ-21T9FS, DTQ-20T1FC CHASSIS : Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). DAEWOO ELECTRONICS CO., LTD. FEATURES FS (Frequency Synthesizer) Tuning System CATV Ready High Focus Minineck CRT ELECTRICAL SPECIFICATIONS POWER INPUT AC90V - AC250V DTQ-20T1FC : 120V POWER RATING 14" Model 20" MONO Model 20" ST Model 21" ST Model INTERMEDIATE FREQUENCIES PICTURE IF CARRIER FREQUENCY SOUND IF CARRIER FREQUENCY COLOR SUB CARRIER FREQUENCY AUDIO OUTPUT RATING SPEAKER ANTENNA INPUT IMPEDANCE TUNING RANGES VHF UHF CATV 50/60Hz 60HZ ONLY 60W 70W 80W 80W 45.75MHz 41.25MHz 42.17MHz MONO(2W) ST(3W+3W) 3W 16ohm VHF/UHF 75 ohm UNBALANCED 2 THRU 13 14 THRU 69 1 THRU 125 CONTENTS Safety Precautions Control View Important Service Notes Block Diagram General Adjustments Operation Charaeteristic of Power Block Trouble Shooting Charts Description of Semiconductors Printed Circuit Board Diagram Exploded Views Schematic Diagram with Waveforms Parts List Option List 3 6 8 9 10 14 22 28 32 33 50 51 65 2 PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO VIDEO PRODUCTS CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY. NEVER SUBJECT : X-RADIATION 950ART94 1009 PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANT RESULTING PROPERTY DAMAGE OR USER INJURY. SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER. WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK. 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, AMY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS. 2. ONLY FACTORY SPECIFIED C.R.T ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS. ALWAYS REINSTALL THEM. 3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD. SUCH AS T