Zenith A27A12D Service Manual

SERVICE MANUALPublished by Technical PublicationsZenith Electronics Corporation201 James Record Road - Huntsville, Alabama 35824-1513ÓCopyright Februa

CM150 1-6 GA - REMOTESPROGRAMMING THE MBR3446 AND MBR3447 REMOTESIf you’re using Zenith products, the remote is alreadyprogrammed for most common code

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CM150 1-7 GA - REMOTESDaewoo 148Emerson 158Funai 154Goldstar 153Hitachi 154LXI 154Magnavox 173, 181Panasonic 174RCA 179Samsung 180Sansui 182Sharp 179S

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

PRINTING THE SERVICE MANUALThe PDF of this service manual is not designed to be printed from cover to cover. The pages vary in size, and must therefor

CM150 2-1 GA - INSTALLER MENUSINSTALLER’S MENUACCESSAccess the Service Menu by using the remote control orthe keyboard on the front of the set.With th

CM150 2-2 GA - INSTALLER MENUS03 H Pos: Moves On Screen Displays horizontally. Rangeis 0 - 13. Generally set at 9.04 Level: There are three positions

CM150 2-3 GA - INSTALLER MENUSINSTALLERS MENU 221-01164-01/02 (continued)FACTORY RECOMMENDED SETTINGS 221-01164-01* 04 Level 0 and 1 are used for Zeni

CM150 2-4 GA - INSTALLER MENUSINSTALLERS MENU 221-01164-01/02 (continued)FACTORY RECOMMENDED SETTINGS 221-01164-02* 04 Level 0 and 1 are used for Zeni

CM150 2-5 GA - INSTALLER MENUS1305 MICRO00 F MODE: (Factory Mode) Use Select key to selectitem #00, which is the first item in the Service Menu,the F

CM150 2-6 GA - INSTALLER MENUS18 H Afc: There are two setting 0 and 1. Setting isusually 1.19 WhComp: (White Compression) There are twosettings 0 and

CM150 2-7 GA - INSTALLER MENUSITEM RANGE 25” 27"00 F Mode 0-1 0 001 Pre Px 0-1 1 102 V Pos 0-24 14 1703 H Pos 0-13 6 804 Level 0-2 0* 0*05

PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTSiIMPORTANT SAFETY NOTICEThis manual was prepared for use only by properly trained audio-vi

CM150 3-1 GA - SERVICINGSERVICINGGENERAL INFORMATIONNOTE: 19" and 20" GA1 chassis is a line connectedchassis. When servicing chassis, use a

CM150 3-2 GA - SERVICINGSERVICING (continued)HV MEASUREMENT PROCEDUREApply signal through the video generator, or tune theTV color receiver to crossh

CM150 3-3 GA - SERVICINGSERVICING (continued)+35 volts DC at CX3272+215 volts DC at junction CX3296 and RX3277CRT filament at pins 1 and 2 of connect

CM150 3-4 GA - SERVICINGSERVICING (continued)volt P-P at emitter of Q9706.2. Audio Balance (19"/20" Models) Adjusts R9745 forequal output

CM150 3-5 GA - SERVICINGSERVICING (continued)the chroma Off. Check that the set displays a goodgray scale from black to white. If black level is toohi

CM150 3-6 GA - SERVICINGSERVICING (continued)PRELIMINARY SETUP1. Allow receiver to warm up for 15 to 20 minutes.2. Degauss receiver.3. Connect crossh

CM150 3-7 GA - SERVICINGSERVICING (continued)VERTICAL-TILT WEDGE ADJUSTMENTThe vertical lines at 6 and 12 o’clock are converged byvertically tilting t

CM150 3-8 GA - IC DESCRIPTIONSIC DESCRIPTIONSIC DESCRIPTIONSAT24C04ATMEL$$$*1'9&&:36&/6'$IC60014K Bit Serial EEPROM2

CM150 3-9 GA - IC DESCRIPTIONSIC DESCRIPTIONS (continued)Pin Configuration221-00907Pilot detectorPilot detectorResonatorStereo/mono selectStereo prese

TABLE OF CONTENTSSECTION 1 GENERAL INFOOVERVIEW ... 1-1MODEL INFORMATION ...

CM150 3-10 GA - IC DESCRIPTIONSIC DESCRIPTIONS (continued)Pin Definition221-00981Test Circuit

CM150 3-11 GA - IC DESCRIPTIONSIC DESCRIPTIONS (continued)IC6000

CM150 3-12 GA - IC DESCRIPTIONSIC DESCRIPTIONS (continued)12345678910111213141516171819202122232425265251504948474645444342414039383736353433323130292

CM150 4-1 GA - MODEL PARTSMODEL PARTSGA-1 MODELSA19A02DPart# Description009-01869-01 MODULE, MAIN, 19, 20V MONAURAL, GA1 CHASSIS014-12290-14 CABINET

CM150 4-2 GA - MODEL PARTSMODEL PARTSA-18681 LINE CORD ASSY , WITH YEONHO CONNECTORA-18695-11 GND STRAP ASSY , CRTA19A11DPart# Description009-01870-

CM150 4-3 GA - MODEL PARTSMODEL PARTSA-07690-06 MAGNET ASSEMBLY, STATIC CONVERGENCE ANDPURITYA-18671 CRT AND YOKE, ASSEMBLYA-18681 LINE CORD ASSY ,

CM150 4-4 GA - MODEL PARTSMODEL PARTS152-00338 WEDGE, YOKE SPACER192-00916 LENS, IR206-03379 INSTR BOOK, OPERATION GUIDE, DAEWOO,SPANISHA-14323 BA

CM150 4-5 GA - MODEL PARTSMODEL PARTS192-00916 LENS, IR206-03379 INSTR BOOK, OPERATION GUIDE, DAEWOO,SPANISHA-14323 BALUN ASSEMBLYA-18588 LINE CORD

CM150 4-6 GA - MODEL PARTSMODEL PARTS049-01369 SPEAKER, OVAL, 6 X 9 CM050-02576-04 CONNECTOR&CABLE, ASSY, 2.5MM, 4 CONTACT, 1 UP124-00213-16 SP

CM150 4-7 GA - MODEL PARTSMODEL PARTSA-07690-06 MAGNET ASSEMBLY, STATIC CONVERGENCE ANDPURITYA-14323 BALUN ASSEMBLYA-18681 LINE CORD ASSY , WITH YEO

A25A12D4 ... 4-11A25A74R ... 4-11A25A74R7 ...

CM150 4-8 GA - MODEL PARTSMODEL PARTS152-00335 WEDGE, YOKE SPACER, POSITIONER192-00917 LENS, IR206-03380 INSTR BOOK, OPERATION GUIDE, ZENITH, SPAN

CM150 4-9 GA - MODEL PARTSMODEL PARTSGA-2 MODELSA25A02DPart# Description009-01789-01 MODULE, MAIN, 25V MONAURAL, GA2 CHASSIS014-12296-09 CABINET FRONT

CM150 4-10 GA - MODEL PARTSMODEL PARTS152-00335 WEDGE, YOKE SPACER,POSITIONER192-00916 LENS, IR206-03369 INSTR BOOK, OPERATION GUIDEA-07690-06 MAGNET

CM150 4-11 GA - MODEL PARTSMODEL PARTS124-00213-16 SPACE COMMAND, TRANSMITTER, TV ONLY152-00335 WEDGE, YOKE SPACER,POSITIONER192-00916 LENS, IR206-033

CM150 4-12 GA - MODEL PARTSMODEL PARTS095-04456-03 DEFLECTION YOKEA63AGD01X VACUUM TUBE, CRT, COLOR, 25 INCH DIAGONAL124-00212-35 SPACE COMMAND, TRANS

CM150 4-13 GA - MODEL PARTSMODEL PARTSA63AFW36X VACUUM TUBE, CRT, COLOR, 25 INCH DIAGONAL110-00687-59 GRILLE CLOTH, RECTANGULAR124-00212-35 SPACE COMM

CM150 4-14 GA - MODEL PARTSMODEL PARTS020-04330-30 COIL, DEGAUSSER046-10578 KNOB ARRAY, PUSH BUTTON, 6 POSITION049-01368-03 SPEAKER, OVAL, 6 X 13 CM05

CM150 4-15 GA - MODEL PARTSMODEL PARTS046-10578 KNOB ARRAY, PUSH BUTTON, 6 POSITION049-01368-03 SPEAKER, OVAL, 6 X 13 CM050-01989 CONNECTOR AND, CABLE

CM150 4-16 GA - MODEL PARTSMODEL PARTSA-18681-01 LINE CORD ASSY , WITH YEONHO CONNECTORA-18695-10 GND STRAP ASSY , CRTLGA26A11DM7Part# Description009-

CM150 4-17 GA - MODEL PARTSMODEL PARTS124-00213-16 SPACE COMMAND, TRANSMITTER, TV ONLY152-00335 WEDGE, YOKE SPACER,POSITIONER192-00916 LENS, IR206-033

CM150 1-1 GA - GENERALOVERVIEWSECTION 1OVERVIEWMODEL INFORMATIONThe GA series chassis was developed for Sentry 2, screensizes 19" through 27"

CM150 4-18 GA - MODEL PARTSMODEL PARTSA-18588-01 LINE CORD ASSY , WITH YEONHO CONNECTORA-18695-02 GND STRAP ASSY , CRTLGA29A12DM4Part# Description009-

CM150 4-19 GA - MODEL PARTSMODEL PARTSA25A22BT64Part# Description009-01996 MODULE, MAIN, 25V MTS, GA3 CHASSIS012-10571 METAL STAMPING , BRACKET, CRT M

CM150 4-20 GA - MODEL PARTSMODEL PARTS012-10858-04 MOLDED PLASTIC , PANEL, JACK PACK, CA CHASSIS014-12038-02 CABINET TRAY, TV, MOLDED PLASTIC014-12229

CM150 4-21 GA - MODEL PARTSMODEL PARTSA-07690-06 MAGNET ASSEMBLY, STATIC CONVERGENCE ANDPURITYA-18681-01 LINE CORD ASSY , WITH YEONHO CONNECTORA-18695

CM150 4-22 GA - MODEL PARTSMODEL PARTS012-10858-04 MOLDED PLASTIC , PANEL, JACK PACK, CA CHASSIS014-12143-02 CABINET TRAY, MOLDED PLASTIC014-12181-09

CM150 4-23 GA - MODEL PARTSMODEL PARTSA27A23WPart# Description009-01997 MODULE, MAIN, WITH MTS, 27V GA3 CHASSIS012-10858-04 MOLDED PLASTIC , PANEL, JA

CM150 4-24 GA - MODEL PARTSMODEL PARTS030-01455-09 DECORATIVE ITEM, CABINET HARDWARE049-01334-02 SPEAKER, OVAL, 3X6.500050-01699-06 CONNECTOR&CABL

CM150 4-25 GA - MODEL PARTSMODEL PARTSA-18232 KEYBOARD ASSEMBLY, WITH IR RECEIVERLGA26A23WM7Part# Description009-02041 MODULE, MAIN, 25V MTS, GA3 CHAS

CM150 4-26 GA - MODEL PARTSMODEL PARTS049-01368-03 SPEAKER, OVAL, 6 X 13 CM050-01699-03 CONNECTOR&CABLE, ASSY, 2.5 MM, 5 CONTACT, 2 UP050-02576 CO

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA1 MODULE PARTS LISTCM150 4-1 GA - MODULE PARTSCritic

CM150 1-2 GA - REMOTESSC3492A MODEL REMOTE CONTROLMUTEPress to turn off sound whilepicture remains. Press againto restore sound.FLSHBKPress to return

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA1 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA1 MODULE PARTS LISTCM150 4-3 GA - MODULE PARTSCritic

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA1 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA1 MODULE PARTS LISTCM150 4-5 GA - MODULE PARTSCritic

-4-6-

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA2 MODULE PARTS LISTCM150 4-7 GA - MODULE PARTSCritic

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA2 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA2 MODULE PARTS LISTCM150 4-9 GA - MODULE PARTSCritic

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA2 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA2 MODULE PARTS LISTCM150 4-11 GA - MODULE PARTSCriti

CM150 1-3 GA - REMOTESMBR3447 MODEL REMOTE CONTROLFLASHBK (Flashback)Returns to previous Channel.POWERTurns TV On or Off.MODESelects the remote’s mode

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA2 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA3 MODULE PARTS LISTCM150 4-13 GA - MODULE PARTSCriti

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA3 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA3 MODULE PARTS LISTCM150 4-15 GA - MODULE PARTSCriti

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA3 MODULE PARTS LISTCritical safety components are id

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA3 MODULE PARTS LISTCM150 4-17 GA - MODULE PARTSCriti

NOTE: This list will enable you to determine the parts used on each Model, Chassis, or Assembly.GA3 MODULE PARTS LISTCritical safety components are id

CM150 5-1 GA - EXPLODED VIEWSGA1 19/20V MONO TABLE TOP SET EXPLODED VIEWREF DESCRIPTION A19A02D A19A02D4 A19A02D7 A19A02D74 A19A02D8 A19A02D84 LGA20A0

CM150 1-4 GA - REMOTESMBR3447A MODEL REMOTE CONTROLFLASHBK (Flashback)Returns to previous Channel.POWERTurns TV On or Off.MODESelects the remote’s mod

CM150 5-2 GA - EXPLODED VIEWSGA1 19/20V STEREO TABLE TOP SET EXPLODED VIEWREF DESCRIPTION A19A11D A19A11D4 A19A11D7 A19A11D74 A19A11D8 A19A11D84 A20A2

CM150 5-3 GA - EXPLODED VIEWSGA2 25/26V TABLE TOP SET EXPLODED VIEWREF DESCRIPTION A25A02D A25A02D4 A25A02D64 A25A02D7 A25A02D74 A25A02D8 A25A02D84 A2

CM150 5-4 GA - EXPLODED VIEWSGA2 25V TRADITIONAL CONSOLE EXPLODED VIEW23MBR3447124-00212-351845673REF DESCRIPTION A25A74R A25A74R7 A25A74R81 ESCUTCHEO

CM150 5-5 GA - EXPLODED VIEWSGA2 25V CONTEMPORARY CONSOLE EXPLODED VIEWMBR3447124-00212-356143872REF DESCRIPTION A25A76R A25A76R7 A25A76R81 ESCUTCHEON

CM150 5-6 GA - EXPLODED VIEWSGA2 27/29V TABLE TOP SET EXPLODED VIEWREF DESCRIPTION A27A11D A27A11D4 A27A11D8 A27A11D84 A27A12D A27A12D4 A27A12D8 LGA26

CM150 5-7 GA - EXPLODED VIEWSGA3 25/26V TABLE TOP SET EXPLODED VIEWREF DESCRIPTION A25A22BT A25A22BT4 A25A22BT64 A25A22BT7 A25A22BT74 A25A22BT8 A25A22

CM150 5-8 GA - EXPLODED VIEWSGA3 27/29V TABLE TOP SET EXPLODED VIEW3421765MBR3447124-00212-358REF DESCRIPTION A27A22BT A27A22BT4 A27A22BT8 A27A22BT84

CM150 5-9 GA - EXPLODED VIEWSGA3 27V TRADITIONAL CONSOLE EXPLODED VIEWREF DESCRIPTION A27A74R A27A74R81 FRONT CABINET 014-12326 014-123262 SPEAKER 049

CM150 5-10 GA - EXPLODED VIEWSGA3 27V CONTEMPORARY CONSOLE EXPLODED VIEWREF DESCRIPTION A27A76R A27A76R81 FRONT CABINET 014-12327 014-123272 SPEAKER 0

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CM150 1-5 GA - REMOTESMBR3446 MODEL REMOTE CONTROLFLASHBK (Flashback)Returns to previous Channel.POWERTurns TV On or Off.MODESelects the remote’s mode

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH

CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X“ IN THEIRCOMPONENT DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED.ALL SYMBOLS WITH