Toshiba MM20E45 Guida all'installazione

COLOUR TELEVISION

MM20E45

TECHNICAL TRAINING MANUAL

FILE NO.016-9502

N5MM1 Chassis

CONTENTS

SECTION I

OUTLINE

SECTION II

CHANNEL SELECTION CIRCUIT

SECTION III

RGB SIGNAL PROCESSING CIRCUIT

SECTION IV

CRT DRIVE CIRCUIT

SECTION V

MODE DISCRIMINATING CIRCUIT AND SYNC SIGNAL PROCESSING CIRCUIT

SECTION VI

SYNC SEPARATION CIRCUIT OF TV MODE

SECTION VII

HORIZONTAL AND VERTICAL OSCILLATION CIRCUIT

SECTION VIII

VERTICAL DEFLECTION CIRCUIT

SECTION IX

HORIZONTAL DEFLECTION CIRCUIT

SECTION X

PROTECTION CIRCUIT

SECTION XI

OSD STABILIZATION CIRCUIT

SECTION XII

PICTURE TUBE

SECTION XIII

POWER SUPPLY CIRCUIT

SECTION XIV

FAILURE DIAGNOSIS PROCEDURES

1-1

SECTION I OUTLINE

1. OUTLINE OF N5MM1 CHASSIS

(MM20E45)

Thismodelisa20”colorTVwith181channeltunerandbuilt

in VGA and Mac II capability. The hybrid design of this

model allows it to serve several purposes. Television

reception, a monitor running Multimedia, PC applications,

or for playback of video games. The 20” FST picture tube

features a stripe pitch 0.58mm, providing a favourable

comparisonstoconventionaldesignswhichgenerallymeasure

0.75 to 0.9mm.

2. PC BOARD CONFIGURATION

(1) Power/V.C.D. PB5226

PB5226-1 Power

PB5226-2 V.C.D.

(2) Deflection PB5227

(3) Signal/Video PB5228

PB5228-1 Signal

PB5228-2 Video

PB5228-3 D-SUB

1-2

3. CONSTRUCTION OF CHASSIS

Power unit

Converter trans

Stand by trans

Sound out radiator

V out radiator

Choke coils

Choke trnas

H out radiator

Signal unit

Jack board

S-VIDEO

Tuner

Video unit

D-sub unit

D-sub connector

Front keys

Power LED

Remote control

receiver

Flyback trans

Def unit

V/C/D unit

Rectifier

Power radiator

1-3

4. LOCATION OF CONTROLS

4-1 TV Set

RGB/

TV/VIDEO

button

MENU button

ADV button

VOLUME

CHANNEL

POWER indicator

REMOTE senser

POWER button

1-4

4-2 Remote Control

ThisRemoteControlallowsyoutocontrolthefunctionsofyourTVsetfrom16feet(5m)away.The“*”markedfunctionbuttons

do not have duplicate locations on your TV set. They can be controlled only by the Remote Control.

Aim at the TV set

TIMER button*

Channel Number

buttons*

CH RTN (Channel Return)

button*

MTS button*

POWER button

MUTE button

SET UP button*

-/+ buttons

OPTION button*

RESET button*

PIC (Picture)* button

V/VIDEO button

RECALL button*

AUD (Audio) button*

CHANNEL button

VOLUME buttons

1-5

4-3 Monitor Panel

This TV set is equipped with RGB INPUT connector, RGB AUDIO INPUT jacks, S-VIDEO INPUT jack, VIDEO/AUDIO

INPUT jacks and VARIABLE AUDIO OUTPUT jacks of connecting your desired personal computer and video/audio

equipment.

TV Rear

34251

RGB INPUT Connector – provide for direct connection of a personal computer.

RGB AUDIO INPUT Jacks – provide for direct connection of a personal computer with audio output terminals.

S-VIDEO INPUT Jack – provide for direct S-video connection from an S VHS VCR or a video disc player.

VIDEO/AUDIOINPUTJacks–providefordirectconnectionofvideodevices(VCR,videodiscplayer,camcorder,etc.)

with video/audio outputs.

VARIABLE AUDIO OUTPUT Jacks – feed volume-controlled stereo audio out from whatever displayed on the screen,

allows connection of audio amplifier and lets you adjust sound level with TV’s remote.

1-6

5. MM20E45 BLOCK DIAGRAM

Tuner/IF module

20VMMTV BLOCK DIAGRAM

Signal switching

TC4053BP

Audio control

CXA1774S

Micro-computer

Memory

Band

pass

Audio output

TA8200AH

C. CAP slicer

Synchronizing signal

process M52346SP

Signal switching

TA7730

R-output

Vertical output

LA7837

Horizontal drive Horizontal

output

Mode distinction

TA75339AP

TC74HC86AP

TC4514P

TA75902 Horizontal/vertical

oscillation LA7860

S-shape

capacitor

switching

Linear coil

switching

Resonance

capacitor

switching

Drive

switching

Synchronizing

signal switching

TC40538P

F/V conversion

IR9331 Horizontal amplitude

control chopper Horizontal drive Horizontal

output

Power unit

To be added

for MM

Model change

( ) For MM

RGB

VIDEO

D.L

Signal

switching

AN5862K

Resonance

capacitor

switching

V/C/D

TA8801

OSD

R-Y G-Y B-Y -Y

G-output

B-output

VAR. OUT

FBT

VIDEO

(VERT)

(+15V)

(HEATER)

DAC

DPC

TA8859AP

HEATER

+15V

AUDIO

VERT.

+100V

TV & MM

H.Sync

V.Sync

Syncon G

High voltage

control chopper

Drive

switching

1-7

6. SPECIFICATIONS

SPECIFICATIONS MODEL No. MM20E45

GENERAL

1 Picture Tube D/T Invar

2 Channel Capacity 181ch

3 C. Caption

4 MTS with dbx

5 Bass, Treble, Balance

6 Sub Audio Program

7 Remote hand unit Regu.

8 Nbr of RMT Button 29key

9 LED Indicators (P)

10 Local Keys 8key

11 Front Surround –

12 Sub Bass System

13 Audio Output 5W x 2

14 Speaker Size & Nbr 80 x 120 x 2

15 Comb Filter (GLS)

16 Black Level Expand –

17 Horizontal Resolution 500

18 Parental-Ch Lock

19 Channel Caption –

20 Off Timer (180min)

21 Channel Search –

22 S-Video In-Term (1)

23 Audio, Video In-Term (1)

24 Variable Audio Out (RCA Jack)

25 RGB Audio (L, R)

26 Mini D-Sub 15pin

27 Rod-Ant/Adapter –/–

NEW

SOUND

PICTURE

OTHER

CABINET

TERM

1-8

MM20E45 PC BOARD CONSTRUCTION

ITEM MM20E45 NEW MODEL CIRCUIT NOTE

DEF

PB5227

POWER/VCD

PB5226

SIGNAL/

VIDEO

PB5228

Def.

PB5227

(249.0 x 330.0)

Power/Audio

PB5226-1

(153.0 x 317.0)

Video/Chroma/Def

PB5226-2

(96.0 x 160.0)

Signal

PB5228-1

(110.0 x 330.0)

Video (CRT/D)

PB5228-2

(119.0 x 210.0)

D-Sub

PB5228-3

(28.5 x 41.5)

Printed wiring board

part code

P/P-M/P:

23534680B

Printed wiring board

part code

P/P-M/P:

23534679B

Printed wiring board

part code

P/P: 23534681B

M/P: 23534681C

249 x 330

dro

Hole draw-

ing: New Hole drawing: New

249 x 330

Hole drawing: New

249 x 330

Hole drawing: New

SIGNAL

VIDEO

CUT LINE

drop

D-SUB

Hole draw-

ing: New

POWER

V-CUT LINE

V/C/D

drop

Hole draw-

ing: New

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