Zenith C27A25, Service Manual

TABLE OF CONTENTS

CM154

XC - TOC

SECTION 1 .................... OVERVIEW

OVERVIEW ..................................................... 1-1
INTRODUCTION ............................................... 1-1
REMOTES ....................................................... 1-2

MBR3457T REMOTE CONTROL ......................... 1-2
MBR3458T REMOTE CONTROL ......................... 1-3
REMOTE PROGRAMMING ................................ 1-4
PROGRAMMING CODES .................................. 1-5

USER MENUS 905-10525 .................................. 1-8

SET UP MENU ............................................. 1-8
SOURCE MENU ........................................... 1-10
VIDEO MENU ............................................. 1-10
AUDIO MENU ............................................ 1-11
PARENTAL CONTROL .................................... 1-11
SPECIAL MENU .......................................... 1-12

SECTION 2 ............. FACTORY MENU

FACTORY MENU ADJUSTMENTS ........................... 2-1
FACTORY MENU SETTING ................................... 2-3

SECTION 3 .................... SERVICING

GENERAL INFORMATION .................................... 3-1

COMPONENT-LEVEL SERVICING ....................... 3-1

ADJUSTMENTS ................................................ 3-2

G2 ADJUSTMENT ......................................... 3-2
ADJUSTMENT OF RGB CUTOFF ........................ 3-2

IF AND AUDIO SERVICING ................................. 3-2

VIDEO DETECTOR ......................................... 3-2
AGC DELAY ................................................. 3-2
MTS STEREO DECODER ALIGNMENT .................. 3-2
STEREO LEVEL ADJUSTMENT .......................... 3-2

PURITY & CONVERGENCE SETUP PROCEDURE ......... 3-3

PRELIMINARY SETUP .................................... 3-3
PURITY ADJUSTMENT ................................... 3-3
CONVERGENCE ADJUSTMENT ........................... 3-3
VERTICAL-TILT WEDGE ADJUSTMENT ................ 3-4
HORIZONTAL-TILT WEDGE ADJUSTMENT ............ 3-4
UNUSUAL TILT CASE ..................................... 3-4
MODIFICATION ............................................ 3-4

TOC-1

MODIFICATION ............................................ 3-4

SECTION 4 ........................... PARTS

MODEL PARTS ................................................. 4-1
COMPONENT PARTS LIST ................................... 4-3

SECTION 5 .......... EXPLODED VIEWS

27V TABLE TOP EXPLODED VIEW ............................... 5-1
32V TABLE TOP EXPLODED VIEW ............................... 5-2
36V TABLE TOP EXPLODED VIEW ............................... 5-3

SECTION 6 .................. SCHEMATICS

INTERCONNECT DIAGRAM ......................................... 6-1
POWER SUPPLY ....................................................... 6-2
AUDIO PROCESSOR ................................................. 6-3
MAIN PROCESSOR ................................................... 6-4
VIDEO PROCESSOR .................................................. 6-5
HORIZONTAL/VERTICAL DEFLECTION ........................... 6-6
JACK AND SWITCH CIRCUIT ...................................... 6-7
VIDEO OUPUT ........................................................ 6-8
COMB FILTER MODULE ............................................. 6-9
PIP MODULE ........................................................ 6-10
PCB LAYOUT ........................................................ 6-11
SMD LAYOUT ........................................................ 6-12