Acer 7277e Service Manual page 4

1.5 Physical Specifications ........................................................................................................................................ 1-17
1.5.1 Physical Diminution & Appearance ................................................................................................... 1-17
1.5.2 Construction and Materials on Outer Surface..................................................................................... 1-17
1.5.3 Base & Swivel .................................................................................................................................... 1-17
1.5.4 Marking & Labels............................................................................................................................... 1-17
1.5.5 Packaging ........................................................................................................................................... 1-18
1.6 Maintainability Specifications ............................................................................................................................. 1-18
1.6.1 General & Requirements .................................................................................................................... 1-18
1.6.2 Mean Time to Repair .......................................................................................................................... 1-18
1.6.3 Accessibility ....................................................................................................................................... 1-18
1.6.4 Equipment & Tools Required............................................................................................................. 1-18
2. CIRCUIT OPERATION THEORY..................................................................................................................................... 2-1
2. 1 Deflection CKT .................................................................................................................................................. 2-1
2.1.1 The Block Diagram of Deflection ...................................................................................................... 2-1
2.1.2 Autosync Deflection Controller (TDA4854) ...................................................................................... 2-1
2.1.3 H-Driver & Output CKT .................................................................................................................... 2-2
2.1.4 Dynamic Focus CKT .......................................................................................................................... 2-2
2.1.5 Brightness & Spot Killer CKT ........................................................................................................... 2-3
2.1.6 BDRV and Step-up CKT .................................................................................................................... 2-4
2.1.7 H-center CKT ..................................................................................................................................... 2-5
2.1.8 HV Shutdown Circuit ......................................................................................................................... 2-5
2.1.9 Horizontal Linearity CKT .................................................................................................................. 2-5
2.1.10 ABL CIRCUIT ................................................................................................................................. 2-6
2.1.11 TILT CKT ........................................................................................................................................ 2-7
2.1.12 Vertical Output Circuit ..................................................................................................................... 2-7
2.2 Switching Power Supply Operation Theory ........................................................................................................ 2-8
2.2.1 General Specification ......................................................................................................................... 2-8
2.2.2 Block Diagram.................................................................................................................................... 2-8
2.2.3 Circuit Operation Theorem................................................................................................................. 2-8
2.2.4 Video C.K.T. Block Diagram ............................................................................................................. 2-11
2.3 Microcontroller Circuit Operation Theory........................................................................................................... 2-12
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1.5.1.1 Overall Dimensions ........................................................................................................... 1-17
1.5.1.2 Net Weight......................................................................................................................... 1-17
1.5.1.3 Outer Appearance .............................................................................................................. 1-17
1.5.4.1 Reference Label (Rear panel) ............................................................................................ 1-17
1.5.4.2 Controls & Connectors ...................................................................................................... 1-17
1.5.5.1 Carton Dimension.............................................................................................................. 1-18
1.5.5.2 Shipping Weight ................................................................................................................ 1-18
1.6.1.1 Installation ......................................................................................................................... 1-18
1.6.1.2 Periodic Maintenance ........................................................................................................ 1-18
1.6.1.3 Repair & Calibration ......................................................................................................... 1-18
1.6.2.1 Module Level..................................................................................................................... 1-18
1.6.2.2 Component Level .............................................................................................................. 1-18
1.6.3.1 General .............................................................................................................................. 1-18
1.6.3.2 Outside Cabinet, Access to the Following Elements ......................................................... 1-18
1.6.3.3 Cover Removal, Access..................................................................................................... 1-18
1.6.4.1 Standard Test Equipment................................................................................................... 1-18
2.1.4.1 Vertical Dynamic Focus .................................................................................................... 2-3
2.1.4.2 Horizontal Dynamic Focus ................................................................................................ 2-3
2.1.5.1 G1 CKT ............................................................................................................................. 2-3
2.1.5.2 Blanking CKT ................................................................................................................... 2-3
2.2.3.1 RFI Filter ........................................................................................................................... 2-8
2.2.3.2 Rectifier and Filter............................................................................................................. 2-8
2.2.3.3 Switching Element and Isolation Transformer .................................................................. 2-9
2.2.3.4 Output Rectifier and Filter................................................................................................. 2-9
2.2.3.5 Control Circuit................................................................................................................... 2-9
2.2.3.6 Feedback Circuit................................................................................................................ 2-10
2.2.3.7 Degauss Circuit ................................................................................................................. 2-10
2.2.3.8 Power Saving Control........................................................................................................ 2-11
2.2.4.1 OSD Preamp CKT ............................................................................................................. 2-11
2.2.4.2 CRT DRIVER CKT .......................................................................................................... 2-12
2.2.4.3 DC Restore CKT ............................................................................................................... 2-12
2.2.4.4 ABL CKT (Auto Brightness Limit)................................................................................... 2-12
2.2.4.5 H-BLANK CKT ................................................................................................................ 2-12
2.2.4.6 Brightness, V-blank, Change Mode Blank, Spotkiller CKT.............................................. 2-12
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7277e Monitor Service Guide