TEAC MV-1421 Service manual

SERVICE MANUAL

Chassis CP-420 DVT14F6H

DVT14F6HA DVT20F6HA

MV1421 / 1422 / 4822

34cm / 48cm Televideo

Effective: December, 1999 MV4822SERV

TABLE OF CONTENTS

1. SPECIFICATIONS.................. ........ ........ ........ ....... ................................ ........ ........ ....... ....................... 1

2. SAFETY INSTRUCTION................. ........ ........ ....... ................................ ........ ........ ....... ........ ............... 3

3. BLOCK DIAGRAM.......................... ........ ........ ............................... ........ ........ ........ ....... ....................... 4

4. ALIGNMENT INSTRUCTIONS...................................... ........ ........ ........ ........ ............................... . ...... 7

5. SERVICE REMOCON DIAGRAM........................................................................................................ 11

6. IC DESCRIPTION........................... ............................... ........ ........ ........ ........ ...................................... 14

7. CIRCUIT DESCRIPTION....................................................... ........ ........ ........ ........ .............................. 40

8. VOLTAGE CHARTS.............................................. ........ ........ ........ ........ ............................... ............... 48

9. PRINTED CIRCUIT BOARDS.............................................................................................................. 52

10. TROUBLE SHOOTING CHARTS...................................................................................................... 54

11. ELECTRICAL PARTS LIST............................................................................................................... 69

12. THE DIFFERENT PARTS FOR SIZE ................................................................................................ 101

13. THE DIFERENT PARTS FOR SYSTEM...................................... ........ ........ ........ .............................. 1 03

1. SPECIFICATION S

1-1. TV PART

TV STANDARD PAL B/G (F. FA MODEL), PAL BIG SECAM -L(L. LA MODEL)

PAL I (P.PA MODEL) PAL/SECAM B/G D/K (D. DA MO DEL)

SCREE N SIZE 14" : 34cm (A34JLL90X)

20" : 48cm (A48JLL90X)

21” : 51cm (A51EAL55X01) MAIN VO LTAG E 230V AC 50Hz, 110~250V AC 50Hz(DA MOD EL) POWER

CONSUMPTION

SOUN D O U TP UT 1.5 Watts ( at 60% mod. , 10% THD ) SPEAKER 3 Watts 16 Ohm ANTENNA

IMPEDANCE TUNING SYSTEM FS ( FREQUENCY SYNTHESIS ) TUNING RECEPTIO N

CHANNEL UNIT

MEMORY CHANNEL 70 PROGRAMS AUX. TERMINAL RCA TYPE AV INPUT JACK

REMOTE CONTROLLER

TELETEXT 8page mem ory TOP and FLO F

STAND BY MODE : BELOW 3 Watts

OPE RATION MO D E : 14" = 68 Watts

20" = 7 8 Wa t ts

21” = 8 8 Wa tts

75 Ohm unbalanced input

VHF-L : E2 - S7

VHF-H : S8 - S36

UH F : S37 - E6 9



HEADPHO NE JACK ( 3.5mm

R-35 w ith 2 "AA " type batteries

- West option : Germ an/Deutch/Flem ish,French,Italian,

Spanish/Portuguese,Swedish/Finnish/Danish,C zech/Slovak

-East option : Polish,Czech/Slovak,Rumanian,Hungarian,Servocroat

Ge rm a n/De u tch/Flemish ,Fren ch ,Italian

-Turkish option : Turkish,English,German/Deutch/Flemish,French,

Italian,Spanish/Portuguese,Swedish/Finnish/Danish

-Cyrillic option : Russian,Lettish/Lithuanian,Estonian,Ukranian,

Czech/Slovak,Servocroat,English

)

OTHER FEATURE ON SCREEN DISPLAY,SLEEP TIMER,ON/OFF TIMER

AU TO TU N ING

CHILD LOCK

TELETEXT

PICTURE TYPE SELECTION

2-TUNER,TV/AV WEIGH T 14” : 13.8kg(set)

20” : 23.6kg(set)

21” : 26.2kg(set)

1-2. VCR PART

GENER AL temperature

format standard tape width 12.65 mm tape speed SP : 23.39m m /sec

max. r e co r din g time w i th fu llsiz e c as se tte

AUDIO recording system longitudinal track

input -3.8dBm(500mVrms), more than 47Kohms, unbalanced. output -3.8dBm(500mVrms),less than 1Kohm, unbalanced frequency range 100Hz to 8KHz signal to noise ratio 40dB(more than)

VIDEO signal system PAL/S E C AM colour and CCIR m ono chrome signals,

recording system R otary 2-head herical scan with a slant double azim uth



~ 35(operating)

-20



~ 60 (storage temperature)

LP : 11.70mm/sec SP : 240min. with E-240 video cassette

LP : 480min. with E-240 video cassette

625lines/50fields.

combination video head. input 1Vp-p, 75 ohms, unbalanced output 1Vp-p, 75 ohms, unbalanced signal to noise ratio 45dB with NETTETE IMAGE control at center position. horizontal resolution 240 lines with NETTETE IMAGE control at center position

* Design and specifications can be subjected to change without notice.

CHANNEL COVERAGE

SYSTEM PAL,SECAM-B/G

PAL-I/I PAL,SECM-B/G ,DK HYPER BAND

CHANNEL VHF ch 2 - 12

UHF ch 21 - 69 CATV ch X,Y,Z,S1-S41

PAL,SECM-B/G HYPER BAND

VHF ch 2 - 12 UHF ch 21 - 69 CATV ch X,Y,Z,S1-S41

PAL-I OAK-B/H

UHF ch21 -69 VHF LOW ch 1A- 5

VHF HIGH ch 5A-N11 UHF ch 21 - 69

IN/OUTPUT JACK TYPE

MODEL EUROPE MIDDLE EAST,ASIA,CIS AUSTRALIA JACK TYPE SCART TPYE & RCA TYPE RCA TYPE

2. SAFETY INSTRUCTION

WARNING

BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION” AND “PRODUCT SAFETY NOTI CE” BELOW.

2-1. X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RAD IATION.To avoid such hazards, the high voltage must not exceed the specified limit. The nom inal value of the high voltage of this receiver is 22-23kv(14”), 25-26kv(20”, 21”) at max beam current. The high voltage must not, under any circum stances, exceed 27.5kv (14", 20”), 29.0kv(21”). Each tim e a receiver requires servicing, the high voltage should be checked. It is recomm ended the reading of the high voltage recorded as a part of the service records. it is im portant to use an accurate and reliable high voltage meter.

2. The only source of X-RAY R adiation in this TV receiver is the picture tube. For continuous RAD IATION protection, the replacem ent tube must be exactly the same type tube as specified in the parts list.

2-2. SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the receiver outside the cabinet or with the back cover removed involves a shock hazard from the receiver.

1) Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions

necessary when working on highvoltage equipm ent.

2) Always discharge the picture tube to avoid the shock hazard before removing the anode cap.

3) Discharge the high potential of the picture tube before handling the tube. The picture tube is highly

evacuated and if broken, glass fragm ents will b e v io le n tly e x p e lle d .

2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.

3. W hen replacing a high wattage resistor(oxide m etal film resistor) in circuit board, keep the re sistor 10mm away from circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 260 volts, 50Hz/60Hz. (AC 100~250 volts, 50/60Hz)NEV ER connect to DC supply or any other power or frequency.

2-3. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the X-RAY RA DIATION protection afforded by them cannot necessarily be obtained by using replacem ent components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements, electrical components having such features are identified by designated symbol on the parts list. B efore replacing any of these components, read the parts list in this manual carefully. The use of substitute replacem ent parts which do not have the same safety characteristics as specified in the parts list may created X -RAY Radiation.

3. BLOCK DIAGRAM

3-1. Audio Signal Flow

3-2. Video Signal Flow

3-3. TV and monitor power switching

4. ALIG NMENT INSTRUC TIONS

4-1. MAIN TUNER AFT

1. STAN DARD B/G

1) Set a signal generator with

- RF FRE Q UE N C Y = 38.9 MH z



- RF OUTP UT LEVE L = 80

2) Connect the signal generator RF output to TP1 ( TUNER IF OU TP UT )

There must be no signal input to the TU N ER .

3) Press the "VCO" KEY and w ait until the TV screen display "AFT OK"

4-2. SUB TUNER AFT

1. STAN DARD B/G

1) Set a signal generator with

- RF FRE Q UE N C Y = 38.9 MH z

- RF OUTP UT LEVE L = 80

2) Connect the signal generator RF output to TP2 ( TUNER IF OU TP UT )

3) Connect the DC voltage meter to TP3.

4) Adjust L201 ( AFT CO IL ) for 2.2V

5 dBuV



5 dBuV



0.1V.

4-3. MAIN TUNER AGC

1) Set a P attern Generator with RF level 60  2 dBuV, 210.25 M Hz.

2) Connect a O SC ILLOSC O PE P R O BE to P101 ( TUNER AG C INPU T ).

3) Adjust AGC U P /DOWN K EY the voltage drop about 1.8V D C over below it's m aximum voltage.

4-4. SUB TUNER AGC

1) Set a P attern Generator with RF level 60 2 dBuV, 210.25 M Hz.

2) Connect a O SC ILLOSC O PE P R O BE to P101 ( TUNER AG C INPU T ).

3) Press the "SUB AG C" KE Y and m onitoring the SUB TUN E R P ICTUR E .

4) Adjust R202 ( SUB AG C VR ) the voltage drop about 1.8V D C over below it's m axim um voltage.

4-5. SCREEN

1) Apply a CO LO R B AR PATTERN SIGNA L.

2) Press the "SCREE N " KEY .

3) Connect a O SC ILLOSC O PE P R O BE to P906 ( CRT CATHO D E R ,G,B )

4) Adjust the screen volume on FB T such that the highest black level voltage 130



5Vdc .

4-6. WHITE BALANCE

1) Apply a CO LO R B AR PATTERN SIGNA L.

2) Adjust the R,G,B UP/DOW N K EY of the other color w hich did not appear on the screen to obtain W H ITE.

4-7. FOCUS

1) Apply a RE TM A PATTERN S IGNAL.

2) Adjust the FOCU S V O LUME on FBT to obtain optimal resolution.

4-8. GEOMETRY

1. S-CORREC TION

1) Apply a CROSSHATCH PATTERN SIGNAL.

2) Adjust the S -COR R U P /DOWN K EY obtain

the same distance betw een horizontal lines.

2. VERTICAL SLOPE

1) Apply a RE TM A PATTERN S IGNAL.

2) Pressing the V -SLOP E +/- KEY,the

lower half of the screen is blanked.

2) Adjust the border line of blanked picture

coincident with the center marks of the pattern using the V -SLOPE + /- KEY.

3. VERTICAL CENTER

1) Apply a RE TM A PATTERN S IGNAL.

2) Adjust the center line of pattern coincident

with the mechanical center m arks of the CRT using the V-CEN TE R +/- KE Y.

4. VERTICAL SIZE



The V-CENTE R adjustment has to be

done in advance.

1) Apply a RE TM A PATTERN S IGNAL.

2) Adjust the upperside of the pattern coincident

with the mechanical center m arks of the CRT using the V-SIZE +/- KE Y.

5. HORIZONTAL CENTER

1) Apply a RE TM A PATTERN S IGNAL.

2) Adjust picture centering with H-CEN TE R +/- KE Y.

4-9. ADJUSTMENT

1. X-POSITION AND P2,P3 ADJUSTMENT

1) Adjust point : X-POSITION

C h e c k in g p o in t : o sc illo s c ope ch1 = H /SW (PY04 #6) o sc illo s c ope ch2 = PB ENVE (PY04 #4) Triggering : CH1 M easuring E quipment : oscilloscope, path jig M ode : PLAYBACK,ATK OFF Test tape : DP -2 (6KH z)

CONNECTION METHODE



Adjustment Procedure

PY04

P601

3 2 1

ADJUST JIG

CH2 CH1

CH1

GND

OSCILLOSCOPE 1

OSCILLOSCOPE 2

1) Connect the PATH JIG to PY04 after Test tape PLAYBA C K

2) Pressing the "ATK OFF" KEY.

3) Insert the DP -2 TAPE . ( Auto playback)

3) Adjust the waveform of PB EN V E to maximum(figure1) using X -position V R.

4) Adjust IN /OUT PU T G U IDE until the exact waveform appear as bellow figure2.

max. (figure 1) (figure 2)

2. AUTO PG ADJUSTMENT

1) After adjustm ent of 9-1. Press the " RE C." button.

2) Eject the Test tape.

3. AZIMUTH ADJUSTMENT

1) Adjust point : AZIM U TH S CR E W

Checking point : SOUND OUTPUT (P601) M easuring E quipment : oscilloscope or audio level m eter. M ode : PLAYBACK Test tape : DP -2 (6KH z)



Adjustment Procedure

1) Connect the measuring equipment to the AUD IO O U TP UT (P601) terminal.

2) After test tape playback, adjust the output level maximally by varing the azim uth screw.



( 6K

-3.8m +1m/-3m )

3) Fix the azim uth screw with locking paint.



If EEPRO M ( I703 ) has been changed :

- Option data has to be changed and

- all alignment function has to be readjusted.



SECAM-L AFT

1. MAIN TUNER AFT

1.1 STANDARD SECAM-L

1) Set a signal generator with

- RF FREQUENCY = 34.5 MHz

- RF O U T P U T L E VEL = 8 0



5 dBuV

2) Connect the signal generator RF output to TP1 ( TUNE R IF OU TPU T )

There must be no signal input to the TU N ER .

3) Press the "VCO -L" K EY and wait until the TV screen display "AFT-L OK"

2. SUB TUNER AFT

2.1 STANDARD SECAM-L

1) Select the P R. of received SE CA M -L

2) Set a signal generator with

- RF FREQUENCY = 34.2 MHz

- RF O U T P U T L E VEL = 8 0



5 dBuV

3) Connect the signal generator RF output to TP2 ( TUNE R IF OU TPU T )

4) Connect the DC voltage meter to TP3.

5) Adjust R240 ( AFT VR ) for 2.2V



0.1V.

5. SERVICE REMOCON DIAGRAM

5-1. HOW TO CHECK TV SECTION WITHOUT VCR DECK

IF YOU WANT TO CHECK TV SECTION WITHOUT DECK MECHANISM, THEN PLEASE PERFORM IN THIS ORDER.

1. PULL OUT THE POWER CORD.

2. REMOVE THE VCR DECK MECHANISM.

3. SUPPLY THE MAIN POWER. (MAIN SW ON)

4. WAIT FOR ABOUT 10 SECONDS. (YO U CAN SEE THE LIGHT OF POWER LED IF THE TV IS NORM AL)

5. TURN ON THE TV USING THE REMOCON.(YOU CAN SEE THE OSD ‘EMERGENCY’)

6. CHECK THE TV SECTION.

5-2. REMOCON

5th 4th

3rd 2nd

1st

RGB

S-CORR

456

V-CEN

H-CEN

REC ATK OFF SUB AGC

AGC

AFT

AFT-L

SCREEN

+++

---

+++

V-SIZE V-SLOP

---

LANGUAGE

To Enter The " SERVICE MODE " Press blue, yellow, green, red power buttons in regular sequency within five seconds using USER REMOCON aft er s etin g TV/VC R off.

5-3. REFER TO GENE RA L ADJUST ME NT

1. S-CORR +/- ( S-CORRECTION )

Press this button to adjust the same distance betwe en h orizontal lines on screen of crosshatch pattern.

2. H-CENTER +/- ( HORIZONTAL CENTER )

Press this button to adjust picture centering with H-center on screen of RETM A pattern.

3. V-CENTER +/- ( VERTICAL CENTER )

Press this button to adjust the center line of the pattern coincident w ith the mechanical center m arks of the CRT on screen of RET M A pattern.

4. V-SIZE +/- ( VERTICAL SIZE )

Press this button to adjust the upperside of the pattern coincident with the mechanical center marks of the CRT on screen of RE TM A pattern.

5. V-SLOPE +/- ( VERTICAL SLOPE )

Press this button to adjust the border line of blanked picture coincident w ith the center m arks of the pattern.

6. R,G,B +/- ( WHITE BALANCE )

The screen is becom e WH ITE adjusted R,G,B level by this button.

7. ATK OFF ( Auto tracking off )

Press this button to adjust X-PATH adjustment. FRO NT panel's LED s are lighted up if you press this button. ( without TAPE )

8. SUB AGC

Press this button to adjust SU B TUN ER AGC Adjustm ent. Press once : picture is displayed colour pattern. Press tw ice : picture is displayed black/white pattern.

9. REC

Press this pattern to adjust AUTO P G Adjustment.

10. LANGUAG E

Press this button to adjust LANG UA G E SELEC TION.

11. SCREEN

Press this button to adjust the screen volum e on FB T.

12. AGC +/-

Press this button to adjust M AIN TUNE R AG C.

13. AFT

Press this button to adjust VCO.

14. AFT-L

Press this button to adjust VCO -L. ( only use the SECAM -L model. )

15. POWER

Press this button to turn your TV/VCR on or off.

If you forget your " child lock secret N o. " 1 . En te r t h e " SERVIC E MO DE. " ¢ †

2. POW ER OFF/ON

6. IC DESCRIPTION

6-1. SDA5255 ( Micro controller & T eletext Decoder )

1. General de scri pti on

The TDA 5255 contains a slicer for V PS and T TX, an accelerating acquisition hardware module, a display generator for "LEVEL1"TTX data and a 8bit u-controller running at 333nsec cycle time. The controller with dedicated hardw are guarantees flexibility, does most of the internal processing of TTX acquisition, transfers data to/from the external memory interface and receives/transmits data via IIC and UA RT user interfaces. The Slicer combined with dedicated hardware stores TTX data in a VB I 1Kbyte buffer. The u-controller firmw are does the total acquisition task (hamm ing and parity checks, page search and evaluation of header control bits) once per field.

2. Feature

•

Acquisition :

- feature selection via special function register

- simultaneous reception of TTX and VPS

- Fixed framing code for TTX and VPS

- Programm able framing code window for TTX

- Acquisition during VBI

- Direct access to VBI RAM buffer

- Acquisition of packets x26,x27,8/30 (firm ware)

- Assistance of all relevant checks (firmw are)

- 1-bit framing-code error torelance (switchable)

•

Display

- Feature selectable via special function register

- 50/60Hz display

- Level 1 serial attribute display pages

- blanking and contrast reduction output

- 8 direct addressable display pages

- 12 x 10 character m atrix

- 96 character R O M (standard 90 character set)

- 143 national option characters for 11 languages

- 288 characters for x26 display

- 64 block mosaic graphic characters

- 32 free addressable characters for OS D in expanded character RO M +32 inside OS D box

- double height (TOP/BOT TOM )

- conceal/reveal

- transparent foreground/background inside/outside of a box

- cursor (colour changes from foreground to background colour)

- flash (flash ra te 1 s)

- programmable horizontal and vertical sync delay

- hardware assisted fast display page erase

- full screen background colour in outer screen

•

Synchronization

display synchronization to sandcastle or horizontal sync and vertical sync with start/stop oscilla tor o r disp lay synchronization to HS/VS with external clock independent clock systems for acquisition, display and controller.

•

Controlle

- 8bit configuration



in ternal clock

- 18



- 0.33

instruction cycle

- eight 16bit data pointer registers (DPTR)

- two 16bit tim ers

- watchdog tim er

- se rial interfa c e (U AR T )

- 1Kbyte on chip extended RAM (access via MO VX)

- 8Kbyte on chip ACQ buffer RAM (access via MO VX)

- 6channel 8bit PWM unit

- 2channel 14bit PWM unit

- 4multiplexed AD C inputs with 8bit resolution

- one 8bit I/O port with open drain output and optional IIC emulation

- two 8bit multifunctional I/Oports

- one 4bit port working as digital or analog inputs

- one 2bit I/O port with optional address latch enable function

•

P-SDIP 52 package

•

5V supply voltage

3. BLOCK DIAGRAM

WATCHDOG

PWM

C500 CPU

ADC

ROM 32KB

TTX VPS SLICER

EXTENDED RAM 1KBYTE

ACK

DISPLAY TIMING

CHAR.ROM 448*12*10

DUAL PORT INTERFACE

VBI BUFFER 1KB

DISPLAY GEN.

DUAL PORT INTERFACE

DISPLAY PAGE 8KB

4. Pin description

PIN NAME SYMBOL DESCRIPTION

1 P3.1 SYS SECAM -L OUT for switching M AINSAW filter L9461

- SECAM-L' : H

- SECAM-L : L

2 P0.7/OP EN D RA IN SYS SECAM -L OU T for switching SUB SAW filter L9461

- SECAM-L' : H

- SECAM-L : L 3 P0 .6/OPEN DRAIN SDA SE RIAL DATA IN/OUT fo r I IC 4 P0.5/OPEN DRAIN SCL SERIAL CLOCK for IIC 5 P 0 .4 /OPE N D R AIN O P T IO N TVCR : L , MVP : H 6 P0 .3/OPEN DRAIN O PT ION B G : L, SE CAM : H 7 P0.2/OPEN DRAIN TUN-CLK TUNER CLOCK 8 P0.1/OP EN DRAIN TUN-DATA TUNER DATA 9 P0.0/OPEN DRAIN OPTION 2HD :L, 4HD:H

10 VSS VSS GROUND 11 VCC VCC POWER SUPPLY 12 X-TAL1 OSC IN input to inverting osc. amplifer 13 X-TAL2 OSC OUT output to inverting osc. amplifer 14 P4 .0 /A L E 15 RESET RST RESET IN(ACTIVE LOW ) 16 P1.7/14BIT PWM CANAL+ CANAL CH RECORD : H 17 P1.7/14BIT PWM 4-STATE TV/AV,AM/FM 18 P1.7/14BIT PWM 2-STATE TV-AM/FM 19 P1.7 /14BIT PWM S / SW SLOW S W IDEN T IN f or Au toma ti c

switching between TV/AV mode

- H : AV/RGB MO DE

- L : TV MO DE

20 P1.7/14BIT PWM MU TE SPK MUTE : H 21 P1.7/14BIT PW M GND GND 22 P1.7/14BIT PW M F/SW FAST SW IDENT IN for stopping OSD

display in RGB mode

- H : TV /A V MODE

- L : RGB MODE

23 P1.7/14BIT PW M OPTION 2 TUN ER : L, 1 TUNE R : H 24 VSSA VSSA Analog GND for slicer 25 FIL3 FIL3 P LL LO O P Filter I/O for Phase Shifting. 26 FIL2 FIL2 P LL LO O P Filter I/O for TTX Slicing. 27 FIL1 FIL1 P LL LOOP Filter I/O for VPS Slicing.

PIN NAME SYMBOL DESCRIPTION

28 VCC A VCCA Analog Supply for Slicer 29 IREF IREF R eference current for slicer P LLs 30 CVBS CVBS CVBS INPUT

31 P2.3/8bit ADC AFT2 AFT INPUT for SUB TUNER 32 P2.3/8bit ADC AGC AGC INPUT for ATS SORTING 33 P2.3/8bit ADC KEY1 KEY MATRIX INPUT 34 P2.3/8bit ADC KEY2 KEY MATRIX INPUT 35 VSS VSS GROUND 36 P3 .3 /I N T 1 IR IN PU T RE MOCO N IR IN PUT 37 VDD VDD POW ER SUPPLY 38 LCIN OS C IN C LOC K IN for OSD 39 LCOUT OSC OUT CLOCK OUT for OSD 40 P3.7/TXT/I/O S/S DATA SYSCON SE RIAL DATA INPUT 41 P3.7/RXD S/S CLK SYSCO N SE RIAL CLOCK 42 P3.4T1 P.DET P OWER DETECTOR : L 43 P3.4T0 MO N ON L TV MONITOR ON : L 44 P3.2INT0 S/S DATA SYSCON SE R IAL DATA OUTPUT 45 HS/SC H/SYNC H SYNC IN (Active H) 46 P4.7/VS V/SYNC V SYNC IN (Active H) 47 R R RED OUT 48 G G GREEN OUT 49 B B BLUE OUT 50 BLANK BL BLANKING OUT 51 CO R COR CONTRAST REDUCTION OUT 52 P3.0 EVEN/ODD EVEN /ODD OUT for non-interacing in TTX mode

6-2. CAT24C08P (EEPROM)

1. Typical feature

IIC BUS co mp a tib le Low pow er CM O S technology 16Byte page write buffer Self timed w rite cycle with auto clear 100,000 program/erase cycles 100 year data retention Optional high endurance device available

2. Descripti on

The CAT24C08P is a 8Kbit serial CM OS EEPRO M internally organized as 1024x8bits. The CAT24C08P features a 16byte page write buffer.

3. Block Diag ram

EXTERNAL

➪

VCC

➪

VGG

START/S TOP

SDA

TEST

SEL AO A1 A2

➪

➪ ➪ ➪

LOGIC

CONTROL LOGIC

STATE COU NTERS SLAVE ADDRESS COMPARATIRS

4. Pin Descri ption

PIN SYMBOL DESCRIPTION

1-3 A0,A1,A2 Device address input

D OUT AKC

WORD ADDRESS BUFFER

XDEC

SENSE AMPS SHIFT REGISTERS

COLUM N DECODERS

HIGH VOLTAGE/ TIMING CONTROL

EEPROM 64X128

DATA IN STORAGE

4 VS S Ground 5 S DA Serial data/address 6 S CL Serial clock 7 TEST Connect to VSS 8 VCC +5V POWER SU PPLY

6-3. TDA8374A( Single chip TV Processor for Negative modulation IF )

1. General D escription

The TDA 8374A is IIC B US controlled single chip TV processors which are intended to be applied in PAL/NTSC television receiver. TDA 8374N3 : With positive and negative m odulation

A pplie d i n PAL /SECA M/NTSC T V.

2. Feature

•

- Vision IF amplifier with high sensitivity and good figures for differential phase and again.

- PLL demodulator with high linearity offering the possibility for (single standard) intercarrier stereo audio application.

- Alignment PLL via IIC

•

VIDEO

- Integrated luminance delay line

- Integrated chroma trap and bandpass filters (auto calibrated)

- Asymm etrical peaking circuit in the luminance channel.

- Black stretching of non standard CVBS or luminance signals.

•

COLOUR

- SECA M interface for application w ith SEC AM add-on TDA8395.

•

RGB

- RGB control (brightness,contrast,saturation.

- Black current stabilization and white point adjustment.

•

INPUT/OUTPUT

- Flexible video source select with CVBS input for the internal signal and tw o external video inputs (one switchable for CVBS or Y/C)

- The output signal of the video source select is externally available(also as CVBS when Y/C input is used.)

- External audio input

- Linear RGB input with fast blanking.

•

SYNCHRONIZATION AND DEFLECTION

- Horizontal synchronization with two control loops and alignment free horizontal oscillator.

- Slow start and slow stop of the horizontal drive output to enable low stress start-up and switch-off from the line circuit at nominal line supply voltage.

- Vertical count dow n circuit for stable behavior with provisions for non standard signals.

- Vertical geometry control

- Vertical drive optim ized for DC coupled vertical output stages.

•

CONTROL

- Full IIC B US control, as w ell for customer controls as for factory alignment.

- All automatic controls have an option for forced mode.

•

POWER CONSUMPTION

- Low pow er consum ption (900m W at 8.0Volts).

•

PACKAGING

- SD IL-56 ( Shrinked Dual In Line, 56pins )

3. Block Diagram

4. Pin Descri ption

NO NAME DESCRIPTION

1 SOUND IF INPUT SIF I NPUT 2 EXT AUDIO IN PUT EXTERNAL AUDIO INPUT 34VCO R EF FILTER The IF VCO tuned circuit is applied to these pin.

Its resonance frequency must be two tim es the if-frequency and in between a range of 64-120Mhz. This range is suitable for the if standards as 33.4,38.9,45.75 and 58.75 MHz. The VCO freq. can be adjusted by IIC bus so a fixed coil can be used.

5 PLL LOO P FILTER The PLL loopfilter is a first order filter with R=390 ohm and C=100nF in series to

ground. The loopfilter bandwidth is 60KHz and is optimal for both fast catching and sufficient video suppression for optim al sound performance. Sound performance can theoretically be improved by adding a small capacitor(approx.0-4.7nF) between pin 5 and ground. This however must be evaluated further because the normal video signal response should not be effected.

6 IF VIDEO OU TP U T Although the video output impedance is low it is recommended to avoid

high frequency current in the output due to for instance sound trap filters. This can be achieved by means of an emitter follower at the video output



with a 1

resistor in series with the base. 7 BUS INP UT : SCL s e r ia l cl o ck lin e 8 BUS INPUT : SDA serial data line 9 BANDGAP

DECOUPLING

10 CHROMA INPUT

11 Y/CVBS INPUT The Y S-VHS signal of 1Vpp (inclu sive sync amplitude) is AC coupled to pin11. 12 37MAIN

POSITIVE SUPPLY

The bandgap circuit provides a very stable and temperature ijdependent reference voltage. This reference voltage(6.7V)ensures optimal performance of the TDA8374 and is used in almost all functional circuit blocks.



The supplied C S-VHS input burst amplitude should be nominally 300 (assumed is a colour bar signa! with 75% saturation and with chroma/burst ratio of

2.2/1).



The C S-VHS input is internally clamped to 4V via 50 The external AC coupling capacitor with 50* forms a high pass filter. A recommended coupling capacitor is 1 nF ; the high pass filter cut off frequency is then approxim ately 3kHz.

The TDA8374A has a main supply pin 12 and a hprizontal supply pin 37. Both pins have to be supplied simultaneously. Notice that the IC has not been designed to use this pin 37as start pin. (pin 37 supplies the horizontal oscillator, PHI-1 and PHI-2) (pin 12 sup plies the rest of the circuits in th IC) The nominal supply voltage is 8V. W ith min/m ax values of 7.2-8.8V. Also in stand-by condition th IC m ust be supplied with 8V.

pp.

NO NAME DESCRIPTION

A Voltage detection circuit is connected to both pins.

- pin12 if V12 < 6.8V than a power on reset, POR. is generated. The Hout output is disabled immediate.

- pin37 if V37 < 5.8V than the horizontal output is disabled imm ediate.

13 17INT CVBS INPU T EXT

CVBS INPUT

It is recom mended that the CVBS1 int and CVBS2 ext input amplitudes are 1Vpp (inclusive sync amplitude).



This, because the noise detector switches the (i.e. auto



1 mode w hen FO A ,FOB=0,0) when noise level exceeds 100mVrms

1 loop to slow mode

(i.e. at S/N of 20dB) 14 G R O U N D All internal circuits are connected to this ground pin 14. 15 AU D IO O U TP UT The output signal is volume controlled and is active for both internal and external

audio signals.

The nominal gain is +12dB and -68dB,which gives a total control range of 80dB. 16 DECOUPLING

FILTER TUNING

Voltage variations at pin 16, which can be due to external leakage current or

crosstalk from interference sources, should be less than 50mV to ensure that tun-

ing of filters/delay cells remains correct. 18 BLACK CURRENT

IN P U T

BLUE OUTPUT

GREEN OUTPUT

RED OUTPUT

For correct operation of the loop CURRENT information is supplied to the black

current input pin.

The RGB output are supplied to the video output stages from pins 21, 20,

and19 respectively.

For nominal signals (i.e. CVBS/S-VHS,-(R-Y),-(B-Y),TTX inputs) and for nominal

control settings, then the RGB output signal amplitudes is typically 2V

BLACK-WHITE. 22 V-GUARD INPUT

/BEAM CURRENT LIMITER

The beam current limiting function is realized by reducing the contrast (and finally

the brightness) when the beam current reaches too high level.

The circuit falls apart in two functions:

- Average beam current limiting(ABL):reacting on the average content of the picture

- Peak white limiting (W PL):reacting on high local peaks in the R GB signal.

RED INPUT GREEN

INPUT BLUE INPUT

25 26 RGB INSERTION

SWIT C H IN PU T

The RIN,GIN,BIN signals(nominal signal am plitude of 700mV)

AC coupled to pin 23,24 and25 respectively.

Clamping action occurs during burstkey period.

The table below a survey is given of the three modes which can be selected with a

voltage on R G B insertion switch input pin ;

Vpin26 IIC function Selected RGB signal

0.9V - 3V IE1 =0 RGB(I NTE RNA L)

IE 1 =1 Rin,Gin , Bin

(fa st ins e r t ion o n p in 23 ,24 ,25 )

>4V IE1=X OS D can be ins erted a t the RG B ou t pins. 27 LU MINAN CE INPUT An nominal input signal amplitude of 1V black-white MUST be DC coupled.

50PF;clamping action occurs during burstkey period. 28 LUMINANCE

OUTPUT

The luminance output signal is approximately 1V black-white w ith typical

output impedance of 250 ohm.

NO NAME DESCRIPTION

29 30R-Y OUTPUT

B-Y OUTPUT

The maximum output impedance of pins 29,and 30 is 500

PAL/N TSC signals are identified. When SEC AM is identified by the



when

SECAM add-on and no PAL/NTSC is already identified by the ASM,

then the A SM sets the -(R-Y)/-(B-Y) output switch open (via DEMSW).

This enables the -(R-Y)/-(B-Y) outputs of the TDA8395 to be directly

connected to pins 29 and 30 respectively. 3132B-Y INPUT

R-Y INPUT

The -(B-Y), -(R-Y) output signals (supplied from baseband delay line) are

AC coupled, via a coupling capacitor of 10nF or greater, to the -(B-Y)/

- (R-Y) inputs; both inputs are clam ped during burstkey period.

33 SE CAM REF OUTP UT The SECA M reference output is directly connected to pin 1 of the TDA8395 for

SECAM decoding;it also can be used as a reference for comb. filter application. 34 35X-TAL 3.58

X-TAL 4.43

To ensure correct operation of both:

- colour processing internal circuits,

- sync calibration internal circuits,

it is only allowed to have 3.6MHz X-tals on pin34: both 4.4MHz, 3.6MHz

X-tals are allowed on pin 35.

If pin35 is not used:then it is left open in application(also XA, XB=0,1). 36 LO OP F ILTE R BUR ST

PHASE DETECTOR

One of the important aspects of the PLL is the loop filter connected to pin 36;

it influences the dynamic perform ance of the loop. 38 CVBS OUTPUT The output amplitude is 1Vpp (transfer gain ratio between CVBS 1int or

CVBS2ext or CVBS3ext/Y S-VHS and CVBS out is 1).

The maximum output impedance is 250ßŸ. 39 BLACK PEAK HOLD

CAPACITOR

For the correct working of the black stretcher an external time constant should be

added at the black peak hold capacitor input. 40 H O R OUTP UT This open collector output is meant to drive the horizontal output stage.

The output is active low,i.e. the line transistor should conduct during

the low period of the output. 41 SANDCASTLE OUTPUT

/FLYBACK INPUT

Pin 41 is a combined input/output pin.

The pin provides a three level sandcastle pulse.

Both burstkey pulse and vertical blanking pulse are always available, the line

blanking pulse is only present when the external flyback pulse is fed to this pin.

The line flyback pulse, fed to this pin is used for two functions

- input signal for the PH I-2 loop

- RGB line blanking.

(without flyback pulse blanking occurs only during the burstkey pulse)

To ensure correct working of the delay line and SECAM add-on,

the output should not be loaded with more than :

- Sandcastle input delay line TDA 4665

- Sandcastle input SECAM add-on TDA 8395

42 PH I-2 FILTE R/ The loop filter is a first order filter.

FLASH PR O DE CT This pin requiresa capacitor(C) only.

A flash protection becomes active when this pin is forced>6V.

The horizontal drive is switched-off immediately.

Once the voltage is <6V the horizontal drive is switched-on again via the slow start

prodecure.

NO NAME DESCRIPTION

43 P HI-1 FILT ER The loop filter connected to pin 43 is suitable for various signal conditions

as strong/weak and VCR signal.

This is achieved by switching of the loopfilter time constant by changing

the PHI-1 output current.

Via IIC bus FOA/B,different time constants can be chosen,including an

automatic mode which gives optimal performance under varing conditions. 44 G R O U ND To this pin are connected the IC-substrate and horizontal output. 45 EAST-WEST DRIVE not used. 46 47VERT. DRIVE+

VERT DRIVE-

The vertical drive has a current output.The output is balanced which ensures a

good common mode behavior with temperature and makes the

output signal less sensitive for disturbances. 48 49IF INPU T The PLL freq. range is 32-60M Hz w ith corresponding VCO freq. 64-120MHz.



The IF input impedance is 2

in parallel w ith 3pF and matches the required load for comm only used saw filters. A DC coupling is allow ed, so no series capacitors between saw filter and IF input are necessary.

50 EHT/OVERVOLTAGE

not used

PROTECT IN PUT

51 VERTTICAL SAW-

TOOTH CAPACITOR

This pin requires a capacitor to ground of 100nF +/-5%. The optim al sawtooth amplitude is 3.5V and is determined by the external capacitor and charge current. The sawtooth bottom-level is 2V.

52 REFERENCE CUR-

RENT INPUT

53 AGC DECOUPLING

CAPACITOR

This pin requires a resistor to ground.



The optimal reference current is 100 The AGC capacitor value is 2.2



.which is determined by this resistor.

and has been defined for an optimal

compromise between AGC speed and tilt for all AGC m odes(+/-modulation)

54 TU NER AGC OU TPUT This output is used to control(reduce) the tuner gain for strong RF signals.

The tuner AGC is an open collector output which is acting as a variable current source to ground.

55 A UD IO D E EM P H AS IS Only a capacitor has to be connected to this pin that defines the deemphasis time

constant. The signal is internally connected through to the Audio switch. The capacitor can be calculated as follows.

56 SOUND DECO UPLING

This pin requires a capacitor of 10



connected to ground.

The pin acts as a low pass filter needed for the DC feedback loop.

6-4. TDA4665 ( BASEBAND DELA Y LINE )

1. Feature

Two comb.filters,using the switched-capacitor technique, for one line delay time. Adjustment free application. No crosstalk between SEC AM colour carriers. Handles negative or positive colour-difference input signals. Claamping of AC -coupled input signals ( (R-Y) and (B-Y)). VC O w ithout external components. 3M Hz internal clock signal derived from a 6M H z VC O , line-locked by the sandcastle pulse (64uS line) Sam ple-and-hold circuits and low pass filters to suppress the 3MHz clock signal. Addition of delayed and non-delayed output signals. Output buffer am plifiers. Com b. filtering functions for NTSC colour-difference signals to suppress cross-colour.

2. General D escription

The TDA 4661 is an integrated baseband delay line circuit w ith one line delay. It is suitable for decoders with colour-difference signal outputs (R -Y) and (B-Y).

3. Block Diag ram

4. Pin Descri ption

SYMBOL PIN DESCRIPTION SY MBO L PIN DESCRIPTION



nc 2 not connected GND 1 10 ground for digital part(0V ) GND2 3 ground for digital part(0V) Vo(R-Y) 11 (R-Y) output signal i.c. 4 internally connected Vo(B-Y) 12 (B-Y) output signal SAND 5 sandcastle pulse input nc 13 not connected nc 6 not connected Vi(B-Y) 14 (B-Y) input signal i.c 7 internally connected nc 1 5 not connected i.c 8 internally connected Vi(R-Y) 16 (R-Y) input signal

6-5. TDA8395 ( SECAM DECODER )

1. Feature

Fully integrated filters. Alignm ent free. For use with baseband delay.

2. Description

The TDA8395 is a self-calibrating, fully integrated SECA M decoder.The IC should preferably be used in conjunction with the PAL/NTSC decoder TDA8362 and with the switch capacitor baseband delay circuit TDA 4665. The IC incorporates HF and LF filters, a demodulator and an identification circuit (lum inance is not processed in this IC) A highly stable reference frequency is required for calibration and a two-level sandcastle pulse for blanking and burst gating.

3. Block Diag ram

CVBS

ref

CLOCHE

78362

BANDGAP T UNING TUNING

ACC

INTERFA C E

115

/IDENT

ref

CLOCHE

FILTER

CONTROL

SAND

220 nF100 nF

ref

PLL

IDENT-

IFICATION

GND

TDA8395

DE-

EMPHASIS

OUTPUT

STAGE

TEST

(R-Y)

(B -Y)

4. Pin Descri ption

SYMBOL PIN DESCRIPTION SYM BOL PIN DESCRIPTION

Fref/ident 1 reference freq. input/ident input. -(R-Y) 9 -(R-Y) output TEST 2 test output -(B-Y) 10 -(B-Y) output Vp 3 positive supply voltage nc 11 not connected nc 4 not connected nc 12 not connected nc 5 not connected nc 13 not connected GND 6 ground nc 14 not connected CLOCH 7 Cloch reference filter SAND 15 sandcastle pulse input PLLref 8 PLLreference CV BS 16 video(chrominance)input

6-6. TDA6106Q ( VIDEO OUTPUT AMPLIFIER )

1. Feature

B la c k -c u rr e n t m ea s u reme n t o u tp u t fo r a u to mat ic bla c k c ur re n t s t a b iliz a tio n (A B S) Single supply voltage of 200V Internal protection against positive appearing CRT flash-over discharge Protection against ES D Internal 2.5V reference circuit Controllable switch-off behavior

2. Description

The TDA6106Q is a monolithic video output amplifier (5M Hz bandwidth) in a SIL 9MP package, using high-voltage DMO S technology, and is intended to drive the cathode of C RT directly. To obtain maximum performance, the amplifier should be used with black-current control.

3. Block Diag ram

Pin 6

TDA6 1O6Q

Vdd

MIRROR 1

in out

Pin 3

vin

Vbias

DIFF.STAGE

out out out out

MIRROR 3

4. Pin Descri ption

SYMBOL PIN DESCRIPTION

nc 1 nc nc 2 nc Vin 3 inverting input GND 4 ground,substrate I om 5 black-current measurement output Vdd 6 supply voltage high nc 7 nc Voc 8 cathode output Vof 9 feedback/transient output

Pin 9 Vof

MIRROR 2

out

Vdd

Pin5 Ion

Pin 8 Voc

CURRENT SOURCE

gnd

Pin 4 Gnd

6-7. TDA8356 ( DC-coupled vertical deflection circuit )

1. Feature

High efficient fully DC-coupled vertical output bridge circuit. Vertical fly-back switch Guard circuit Protection against : 0short circuit of the output pins (7 and 4) Tem perature (thermal) protection High EMC imm unity because of common m ode inputs

2. Description

The TDA 8356 is power circuit for use in 90 and 110 colour deflection system s for field frequencies of 50 to 120Hz. The circuit provides a DC driven vertical deflection output circuit, operating as a high efficient class G system.

3. Block Diag ram

4. Pin Descri ption

SYMBOL PIN DESCRIPTION

Idrive(pos) 1 input power stage (positive) : include Ii(sb) signal bias Idrive(neg) 2 input pow er stage (negative) : include Ii(sb) signal bias Vp 3 operating supply voltage Vo(b) 4 output voltage B GND 5 ground Vfb 6 input flyback supply voltage Vo(a) 7 output voltage A Vo(guard) 8 guard output voltage Vi(fb) 9 input feedback voltage

+ 100 hidden pages

TEAC MV-1421 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1. SPECIFICATION S

2. SAFETY INSTRUCTION

3. BLOCK DIAGRAM

4. ALIG NMENT INSTRUC TIONS

5. SERVICE REMOCON DIAGRAM

6. IC DESCRIPTION