Sanyo CE14A2-C, Service Manual

Service manual

CHASSIS 2112-Series EC7-A

2

4.3.5.1

Heater supply. .................................................................................................................................. 12

4.3.6

EHT discharge. ....................................................................................................................................... 12

4.3.7

Protections.............................................................................................................................................. 12

4.3.7.1

Low Flyback protection..................................................................................................................... 12

4.3.7.2

Heater short-circuit protection. ......................................................................................................... 12

4.3.7.3

Beam current overconsumption protection. ..................................................................................... 13

4.3.7.4

C656 open-circuit protection. ........................................................................................................... 13

4.4

V

ERTICAL DEFLECTION

. ................................................................................................................................... 13

4.4.1

Vertical deflection suppliers. ................................................................................................................... 13

4.4.2

Vertical deflection protection................................................................................................................... 13

4.5

B

EAM CURRENT LIMITER AND GEOMETRY COMPENSATIONS

................................................................................ 13

4.5.1

BCl signal generation.............................................................................................................................. 13

4.5.2

Geometry compensations....................................................................................................................... 13

4.5.2.1

Width and height compensation....................................................................................................... 13

4.5.2.2

Phase compensation........................................................................................................................ 13

4.5.3

ABL description....................................................................................................................................... 14

4.5.3.1

BCL signal generation. ..................................................................................................................... 14

4.5.3.2

Contrast and brightness reduction. .................................................................................................. 14

4.6

T

UNER AND TUNING CIRCUIT

. ........................................................................................................................... 14

4.7

V

IDEO SIGNAL PROCESSING

. ............................................................................................................................ 14

4.7.1

Video processor...................................................................................................................................... 14

4.7.1.1

Video processor versions................................................................................................................. 14

4.7.1.2

IF video............................................................................................................................................. 14

4.7.1.3

Horizontal and vertical synchronisation. ........................................................................................... 15

4.7.1.4

Geometry processor......................................................................................................................... 15

4.7.1.5

Video filter and switches................................................................................................................... 16

4.7.1.6

Colour decoder................................................................................................................................. 16

4.7.1.7

RGB processing. .............................................................................................................................. 16

4.7.1.8

RGB control...................................................................................................................................... 16

4.7.1.9

Supply and Bandgap. ....................................................................................................................... 17

4.7.2

Block diagrams of video paths................................................................................................................ 17

4.8

A

UDIO SIGNAL PROCESSING

. ............................................................................................................................ 17

4.8.1

Audio processor...................................................................................................................................... 17

4.8.2

AM sound................................................................................................................................................ 17

4.8.3

L’ system................................................................................................................................................. 18

4.8.4

Audio switching. ...................................................................................................................................... 18

4.8.5

Speaker amplifier. ................................................................................................................................... 19

4.9

RGB 

AMPLIFIER

. ............................................................................................................................................. 19

4.10

CRT 

SOCKET CONNECTOR

. .......................................................................................................................... 19

4.11

P

ERIPHERAL CONNECTIONS TO 

TV 

SET

. ........................................................................................................ 19

5.

CONFIGURATION AND ADJUSTMENTS.......................................................................................................... 19

5.1

S

ERVICE MENU

................................................................................................................................................ 19

5.1.1

Service menu navigation. ....................................................................................................................... 20

5.1.2

Meaning of each adjustment................................................................................................................... 21

5.2

A

DJUSTMENTS

. ............................................................................................................................................... 22

6.

SPECIAL MODES AND PROCEDURES. ........................................................................................................... 23

6.1

S

ECAM 

B/G – L 

ADAPTATION

. .......................................................................................................................... 23

6.2

NTSC M (NTSC 3, 579545) 

ADAPTATION

....................................................................................................... 24

6.3

P

ROCEDURE OF SUBSTITUTION OF MICROPROCESSOR 

IC100. ........................................................................... 24

6.3.1

TV sets without TXT: OTP replacement with a mask. ............................................................................ 24

6.3.2

TV sets with TXT: OTP replacement with a mask. ................................................................................. 25

6.4

I

NITIAL AUTO TUNING SETTING

. ......................................................................................................................... 25

6.5

P

ROCEDURE OF NON

-

VOLATILE MEMORY SUBSTITUTION

. ................................................................................... 25

6.6

“F

ACTORY

” 

MODE DESCRIPTION

. ...................................................................................................................... 25

6.7

D

ESCRIPTION OF 

“H

OTEL

” 

AND 

“R

ENTAL

” 

MODES

.............................................................................................. 25

7.

FAILURE LOCATION.......................................................................................................................................... 26

7.1

I

NTRODUCTION

. ............................................................................................................................................... 26

7.2

T

HE START

-

UP PROCEDURE

. ............................................................................................................................ 26

7.3

P

ROTECTIONS

. ................................................................................................................................................ 26

7.4

I

NDICATION OF ERRORS 

(LED 

BLINKING

). ......................................................................................................... 26