TEAC CTM-6854-S Service manual

V

SERVICE MANUAL

CTM6854S

68 CM CTV

MAR03 CTM6854SER

SUPPLY VOLTAGE : AC220V 50Hz > + 10% / -20%

SPECIFICATION

SYSTEM :

CHANNEL L - VHF : H - VHF : UHF :

VIF FREQUENCY : SIF FREQUENCY : CHROMA IF FREQUENCY : INTER-CARRIER FREQUENCY : SCANNING HORIZONT AL :

VERTICAL : ANTENNA INPUT IMPEDANCE :

SM-37PM P. 1

CRT :

PAL - I / I

4 - 13

21 - 69

38.9

32.9

34.47

6.0

P AL - BG

2 - 4

5 -12

21 - 69

38.9

33.4

34.47

5.5

PAL - I

(UK)

21 -69

39.5

33.5

35.07 6

P AL - SECAM -

BG / DK

1 - 5

6 - 12

21 - 69

38.0

31.5 32.5

33.57 33.57

6.5 5.5

P AL - SECAM -

BG / DK

( HYPER )

1 - 5

6 - 12

21 - 69

38.9

32.4 33.4

34.47 34.47

5.5 6.5 15625 LINE

50 Hz

75 OHM

25" 29"

P AL - BG

( HYPER )

E2 - S10 E5 - S41

E21 - E69

38.9

33.4

34.47

5.5

P AL - BG

( CATV )

E2 - S2

E5 - S20

E21 - E69

38.9

33.4

34.47

5.5

SECAM - L

1 - Q

21 - 69

38.9

32.4

34.47

6.5

L'

FB - FC

32.7

39.2

6.5

CH CH

CH MHz MHz MHz MHz

ITEMS OF MEASUREMENT

ST ANDARD

UNIT

VIDEO SENS. AT S/N 30db

L - VHF

H - VHF

UHF

SOUND SENS. A T S/N 30db

L - VHF

H - VHF

UHF AGC CHARACTER SELECTIVITY -1.5 MHz

+ 8 MHz COLOR SENS. COLOR LOCK - IN RANGE VERTICAL LOCK - IN RANGE HORIZONTAL LOCK - IN RANGE MAX BRIGHTNESS MAX OUTPUT POWER OUTPUT POWER AT 10% THD

< 57 < 57 < 60

< 42 < 42 < 48

> 60 > 35

> 40 < 45 > +300 > 6 > 400 > 100 > 4.5 > 3.5

dbuv dbuv dbuv

db db

db

dbuv

Hz Hz Hz

cd/m2

W

W BUZZ AFC RANGE

MIN. VOL HUM RESOLUTION HORIZONT AL

VERTICAL

LINEARITY DISTORTION VERTICAL

HORIZONTAL RASTER DISTORTION REMOTE CONTROL DISTANCE

ANGLE

POWER CONSUMPTION ( A T NORMAL CONDITION ) POWER CONSUMPTION ( AT MAX. CONDITION )

CONVERGENCE DISLOCATION AT AREA "A"

AREA "B"

( see fig.1 )

< -40 > +1

> -0.5 < 20 > 300

> 400 < 10

< 10 < 5 > 5

> +15 < 120

< 150 < 0.4

< 0.8

db

MHz MHz

mV

LINES LINES

% %

%

METER

DEGREE

WATTS WATTS

% %

0

VIDEO INPUT LEVEL : 1.0V P-P + 3dB AUDIO INPUT LEVEL : 0.5V RMS + 3dB

Fig.1

A

SM-37PM P. 2

B

ALIGNMENT INSTRUCTION

I. PLEASE READ BEFORE A TTEMPTING SER VICE

1. Never disconnect any leads while receiver is in operation.

2. Disconnect all power before attempting any repairs.

3. Do not short any portion of the circuit while power is on.

4. For safety reasons, all parts replaced should be identical, ( for parts and part numbers see parts list ).

5. Before alignment the set must be pre-heated for 30 minutes or more and erase magnetism thoroughly from CRT front chassis frame by erase coil. ( Except IF, SYNC, COLOR, SECAM, B+, SOUND )

II.

TEST EQUIPMENT

1. Colour Bar, Dot, Cross Hatch Generator

2. DC Power Supply

3. Oscilloscope

4. Vacuum T ube Voltmeter

5. Volt Ohmmeter

6. High Voltage Meter

7. Ampere Meter ( 0.5 Class, DC 3mA Max )

8. Demagentizing Coil

9. Philips Pattern Generator

10. High Pot Tester

III. FACTORY ADJUSTMENT : See table 1- 4

1. Press REMOTE FACTOR Y ON button.

2. Press REMOTE FACT ORY button.

3. Press REMOTE UP or DOWN button select item.

4. Press REMOTE value (+) (-) button,adjust the value.

5. REMOTE DIALOG CENTRE button can turn off factory mode function. REMARK : NO this factory on Normal remote control .

IV.B+ ADJUSTMENT

1. Connect a digital voltmeter between the W234 and Ground.

2. Press REMOTE Picture button.

3. Press REMOTE UP/DOWN and value (-) button set Brigntness,contrast,color to minimum.

4. Adjust Screen Volume on FBT Until the picture can just been seen

5. Adjust VR901 and obtain a reading of 143V +1V (DC).

.

V. AGC ALIGNMENT

1. Receive CH69 ( UHF ) and input field strength. (60dB in put signal)

2. Connect a digital voltmeter between the TUNER AGC TERMINAL and Ground.

3. Press REMOTE AGC button.

4. Press REMOTE value (+) (-) button adjust value to (0) and then adjust AGC take over value obtain drop down 0.4V. (DC) REMARK : ( 1/ The drop down voltage should be more than and tends to 0.4V ) ( 2/ No observable noise can be seen )

SM-37PM P. 3

VI. SOUND TRACKING ALIGNMENT

1. Receive a gray scale pattern.

2. Connect a oscilloscope and monitor IC109 TDA3857 PIN 15 and Ground.

3. Adjust T101 to obtain the waveform Fig.6.

4. Conect a Voltage meten and monitor IC 104 TDA9801 PIN 15 and gorund.

5. Adjust T101 obtain 5V

Remark: All frequency of Marker points are +0.2% tolerance.

+0.1V (DC).

Fig.6

VII. EAST - WEST CORR ECTION ADJUSTMENT

1) Receive a crosshatch and center cross pattem.

2) Set the Brightness,contrast to middle position.

3) Press REMOTE EW-Par/wid,EW-trap button,Press REMOTE VALUE (+) (-) button adjust Value to normal regular picture.

4) Press REMOTE WE-width button,Press REMOTE value (+) (-) button adjust value to proper horizontal width ( 90% + 2% )

VIII. HORIZONT AL SHIFT ADJUSTMENT

1. Receive Monoscope Pattern input signal 70dB +10dB.

2. Press REMOTE H-shirt button.

3. Press REMOTE value (+) (-) button adjust value to obtain the picture at center +2mm. ( Specification show in Fig.8 )

IX. VERTICAL LINEARTY ADJUSTMENT

1) Receive a crosshatch and center cross pattem.

2) Set the Brightness,contrast to middle position.

3) Press REMOTE V-SIope,S-Correction button,Press REMOTE Value (+) (-) button adjust value to normal regular picture.

4) Press REMOTE V-Shift button,Press REMOTE Value (+) (-) button adjust value to obtain the picture at center.

X. VERTICAL AMPL ADJUSTMENT

1. Receive the Monoscope Pattern.

2. Press REMOTE V-ampl button.

3. Press REMOTE value (+) (-) button adjust value to obtain a normal picture.

XI. WHITE BALANCE ALIGNMENT STEP

( Degauss the picture by degaussing coil if necessary )

1. Receive a grey scale pattern

2. Connect a oscilloscope and monitor CN101 pin"3"and ground.

3. Press REMOTE picture button.

4. Press REMOTE UP/DOWN and value (-) button set the brightness,contrast, to middle position.

5. Ajust screen volume on FBT unitl the waveform to 2.5V+/-0.25V DC see fig.7.

6. Press REMOTE sub bri button.

7. Press REMOTE value (+) (-) button adjust value to (18).

8. Receive a black and white pattern

9. Press REMOTE with bal button.

10. Press REMOTE UP/Down and value (+) (-) button adjust blue str value to(0).

11. Press REMOTE picture button.

12. Press REMOTE UP/Down and Value(+) (-) button set the brightness and color to minimun position. contrast to MAX position.

13. Press REMOTE pt r.g.b.button.

14. Press REMOTE UP/Down and value (+) (-) button adjust the white balance.(9300

o

k)

SM-37PM P. 4

OV (DC)

2.5V+/-0.25V (DC)

fig.7

SM-37PM P. 5

XII.SUB - BRIGHTNESS ALIGNMENT

1. Receive a grey scale pattern.

2. Press REMOTE picture button,.

3. Press REMOTE UP/DOWN and value (-) button set the brightness, contrast to minimun.

4. Press REMOTE sub bright button.

5. Press REMOTE value (+) (-) button adjust value to brightness bar can just be seen.

XIII. FOCUS ALIGNMENT

1) Set the Brightness and Contrast to middle position.

2) Receive a monoscope pattern.

3) Adjust focus control to obtain sharpest picture.

XIV. HIGH POT TESTING

1) Short the L - pole and N - pole of AC line cord.

2) Switch on the power switch of the TV Set.

3) Connect The High Pot Tester ( - ) to L and N pole, ( + ) to the METAL PART of CABINET.

CONDITION

SAFETY STD. VDE, SAA

BS CHINA STANDARD UL

TEST STANDARD

3.0KV 10mA / 1MIN

4.0KV 10mA / 1MIN

3.0KV 10mA / 1MIN

1.0KV 5mA / 1MIN

TEST STANDARD

FOR PRODUCTION

>3.5 KV <10mA / >10 SEC. >4.0 KV <10mA / >10 SEC. >3.3 KV < 5mA / > 6 SEC. >1.25KV < 5mA / > 1 SEC.

Remark:

1) If no other specify, the strength of input signal should be 70dB +10dB.

2) The High Pot Tester can have < +5% tolerance.

SM-37PM P. 6

DISTRICT

CENTRE (mm)

POSITION

LIMIT (mm)

SCANNING

SIZE (%)

SCANNING

SIZE

LIMIT (%)

THAILAND FRANCE GERMANY *GROUP A *GROUP B *GROUP C

mm -5 -4 -3 -2 -1 0 1 2 3 4 5 mm

LEFT RIGHT

-1 +3 +3

-2

+3

0 ~ -2 0 ~ +5 0 ~ +5

-5 ~ -1

0

-2 ~ +2 0 ~ +5

CENTRE OF

THE SCREEN

90 90 90 90 90 90

CRT MUST FACE T O EAST

88 ~ 92 88 ~ 94 90 ~ 95 88 ~ 94 88 ~ 94 88 ~ 94

FIG. 8

REMARK :

1. SUITABLE FOR 14" OR ABOVE TV.

2. Adjust the centre position must take the upper side of monoscope pattern for standard.

3. Group A : AUSTRALIA, NEW ZEALAND, T AHITI.

4. Group B : HONG KONG, CHINA, AMERICA, CANADA, MALA YSIA, MEXICO.

5. Group C : ENGLAND, ITALY, GERMANY, RUSSIA, SWITZERLAND, JUGOSLA VIA, SPANISH. If the above countries are not include, please consult to Engineering Dept.

SM-37PM P. 7

FACTORY MODE TABLE 1

REF

ITEM

REMARK

VALUE

O = TV Status

1

2

POWER

TDA884X

P

3

S = Power Status P = Last power status

1=P AL/NTSC.W/O EW 3=PAL/NTSC.W/EW 2=PAL/SECAM/NTSC.W/O EW 4=PAL/SECAN/NTSC,W/EW

3

4

5

6

7

8

9

10

S.SYS

LOGO

CT1

OSD. ANTENNE LANGUAGE

WOOFER

TUNE

TEXT BLUE EX LANGUAGE

AV NO

1 = DK/I

6

1

0

2 = BG/DK

3 = DK/I/M  1 = NIL TEAC 2 = TEAC 3 = HAIER

0 = OFF 1 = ON

0 = NO BACKGAN 1 = W/BACKGAN 0 = OFF ANTENNE 1 = ON ANTENNE 0 = ENG 1 = RUSSIAN

0 = OFF

4 = BG/DK/I/M 5 = I 6 = BG

1 = NIL

CHINA

2 = ROWA 3 = CAIXIING 4 = HAIER

0

1 = ON

0 = NO POWER ON AUTO TUNER 1 = POWER ON AUTO TUNER

0

1

0 = OFF TEXT 1 = ON TEXT

0 = OFF BLUE EX 1 = ON BLUE EX 0 = ENGLISH ONL Y 1 = CHINESE/ENGLISH

1 = TV/AV1/AV2/AV3/S-VHS

2 = TV/AV1/AV2/S-VHS

3 = TV/AV1/AV2

11

12

13

16:9 KARAOKE DVDTX Set

BBE

HALF SCR

0 = OFF 16:9

0

0 = OFF KARAOKE 0 = OFF DVD

0 = OFF

1 = ON 16:9 1 = ON KARAOKE 1 = ON DVD

0

1 = ON

0 = Picture

0

1 = HACF Picture

SM-37PM P. 8

F ACTORY MODE TABLE 2

ITEM

1

H-SHIFT

2

V-SLOPE

3

V-AMPL

4

S-CORRECT10N

5

V-SHIFT

6

EW-WIDTH

VALUE

ADJUST

RANGE

REF

VALUE

REMARK

co-ff dd For CTI ON TV set Adjustment

80-Bf

0-3f

40-80

80-Bf

0-3f

a3

2b

55

90

1e

36

For CTI OFF TV set Adjustment

For TV set Adjustment

7

EW-P AR

8

EW-CORNER

9

EW-TRAP

10

CONTROL 0

11

CONTROL 1

12

AGC

13

PLL

0-3f

0-3f (TEAC) 40-7f (CHINA)

16

0

2a

3

90

12

40

For TV set Adjustment

NON-Adjustable V alue

For TV set Adjustment

For TV Set IF Frequency 40 = 38.90 MHz 80 = 33.40 MHz 60 = 38.00 MHz CI = 33.90 MHz

SM-37PM P. 9