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SERVICE MANUAL
MV1421 / 1422 / 4822
34cm / 48cm Televideo
Chassis CP-420
DVT14F6H
DVT14F6HA
DVT20F6HA
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............................................................................................ 103
1. SPECIFICATIONS
1-1. TV PART
TV STANDARD PAL B/G (F. FA M O DEL), PAL BIG SEC AM -L(L. LA M O DEL)
PAL I (P.PA M O DE L) PAL/SECAM B/G D/K (D. DA M O DEL)
SCREEN SIZE 14" : 34cm (A34JLL90X)
20" : 48cm (A48JLL90X)
21" : 51cm (A51EAL55X01)
M AIN VO LTAG E 230V AC 50Hz, 110~250V AC 50Hz(DA M O DEL)
PO W ER STAND BY M O DE : BELO W 3 Watts
CO NSU M PTIO N O PERATIO N M O DE : 14" = 68 Watts
20" = 78 Watts
21" = 88 Watts
SO UND O UTPUT 1.5 Watts ( at 60% m od. , 10% THD )
SPEAKER 3 Watts 16 O hm
ANTENNA 75 O hm unbalanced input
IM PEDANCE
TUNING SYSTEM FS ( FREQ UENCY SYNTHESIS ) TUNING
RECEPTIO N VH F-L : E2 - S 7
CHANNEL UNIT VH F-H : S8 - S36
U HF : S37 - E69
M EM O RY CHANNEL 70 PRO G RAM S
)
AUX. TERM INAL RCA TY PE AV INPU T JACK
HEADPHO NE JACK ( 3.5m m
REM O TE R-35 with 2 "A A" type batteries
CO NTRO LLER
TELETEXT 8page m em ory TO P and FLO F
- W est option : G erm an/Deutch/Flem ish,French,Italian,
Spanish/Portuguese,Swedish/Finnish/Danish,Czech/Slovak
-East option : Polish,Czech/Slovak,Rum anian,Hungarian,Servocroat
G erm an/Deutch/Flem ish,French,Italian
-Turkish option : Turkish,English,G erm an/Deutch/Flem ish,French,
Italian,Spanish/P ortuguese,Swedish/Finnish/Danish
-Cyrillic option : Russian,Lettish/Lithuanian,Estonian,Ukranian,
Czech/Slovak,Servocroat,English
O THER FEATURE O N SCREE N DISPLAY,SLEE P TIM ER,O N /O FF TIM ER
AU TO TU NING
C HILD LO CK
TELETEXT
PICTURE TYPE SELECTION
2-TUNER,TV /AV
W EIG HT 14" : 13.8kg(set)
20" : 23.6kg(set)
21" : 26.2kg(set)
1
1-2. VCR PART
G ENERA L tem perature
5 ~ 35 (operating)
-20 ~ 60 (storage tem perature)
form at standard
tape width 12.65 m m
tape speed SP : 23.39m m /sec
LP : 11.70m m /sec
m ax. recording tim e with SP : 240m in. with E-240 video cassette
fullsize cassette
LP : 480m in. with E-240 video cassette
AUDIO recording system longitudinal track
input -3.8dBm (500m Vrm s), m ore than 47Kohm s, unbalanced.
output -3.8dBm (500m Vrm s),less than 1Kohm , unbalanced
frequency range 100H z to 8KHz
signal to noise ratio 40dB(m ore than)
VID EO signal system PAL/SE CAM colour and CCIR m ono chrom e signals,
625lines/50fields.
recording system Rotary 2-head herical scan with a slant double azim uth
com bination video head.
input 1Vp-p, 75 ohm s, unbalanced
output 1Vp-p, 75 ohm s, unbalanced
signal to noise ratio 45dB with NETTETE IM AG E control at center position.
horizontal resolution 240 lines w ith NETTETE IM AG E control at center position
* D esign and specifications can be subjected to change w ithout notice.
CHANNEL COVERAGE
SYSTEM PAL,SECAM -B/G PAL,SECM -B/G PAL-I O AK-B/H
PAL-I/I HYPER BAND
PAL,SECM -B/G ,DK
HYPER BAND
CHANNEL VHF ch 2 - 12 VHF ch 2 - 12 UHF ch21 -69 VHF LO W ch 1A- 5
UHF ch 21 - 69 UHF ch 21 - 69 VHF HIG H ch 5A-N11
CATV ch X,Y,Z,S1-S41 CATV ch X,Y,Z,S1-S41 UHF ch 21 - 69
IN/OUTPUT JACK TYPE
M O D EL EURO PE M IDDLE EAS T,ASIA,CIS AUSTRALIA
JACK TYPE SCART TPYE & RCA TYPE RCA TYPE
2
2. SAFETY INSTRUCTION
BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION",
W ARN ING
"SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" BELOW.
2-1. X-RAY RADIATION PRECAUTION
1. E xcessive high voltage can produce potentially hazardous X -R AY R A D IATIO N .To avoid such hazards,
the high voltage m ust not exceed the specified lim it. The nom inal value of the high voltage of this receiver is
22-23kv(14"), 25-26kv(20", 21") at m ax beam current.
The high voltage m ust not, under any circum stances, exceed 27.5kv (14", 20"), 29.0kv(21").
E ach tim e a receiver requires servicing, the high voltage should be checked. It is recom m 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 m eter.
2. The only source of X -R AY R adiation in this TV receiver is the picture tube. For continuous R A D IATIO N
protection, the replacem ent tube m ust be exactly the sam e type tube as specified in the parts list.
2-2. SAFETY PRECAUTION
1. P otentials of high voltage are present w hen this receiver is operating. O peration of the receiver outside
the cabinet or w ith the back cover rem oved involves a shock hazard from the receiver.
1) S ervicing should not be attem pted by anyone w ho is not thoroughly fam iliar w ith the precautions
necessary w hen w orking on highvoltage equipm ent.
2) A lw ays discharge the picture tube to avoid the shock hazard before rem oving the anode cap.
3) D ischarge the high potential of the picture tube before handling the tube. T he picture tube is highly
evacuated and if broken, glass fragm ents w ill be violently expelled.
2. If any Fuse in this TV receiver is blow n, replace it w ith the FU S E specified in the R eplacem ent P arts List.
3. W hen replacing a high w attage resistor(oxide m etal film resistor) in circuit board, keep the resistor 10m m
aw ay from circuit board.
4. K eep w ires aw ay from high voltage or high tem perature com ponents.
5. This receiver m ust operate under A C 260 volts, 50H z/60H z.
(A C 100~250 volts, 50/60H z)N E V E R connect to D C supply or any other pow er or frequency.
2-3. PRODUCT SAFETY NOTICE
M any electrical and m echanical parts in this chassis have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the X -R AY R A D IAT IO N protection
afforded by them cannot necessarily be obtained by using replacem ent com ponents rated for higher voltage,
w attage, etc. R eplacem ent parts w hich have these special safety characteristics are identified in this m anual
and its supplem ents, electrical com ponents having such features are identified by designated sym bol on the
parts list. B efore replacing any of these com ponents, read the parts list in this m anual carefully.
The use of substitute replacem ent parts w hich do not have the sam e safety characteristics as specified in the
parts list m ay created X -R AY R adiation.
3
3. BLOCK DIAGRAM
3-1. Audio Signal Flow
4
3-2. Video Signal Flow
5
3-3. TV and monitor power switching
6
4. ALIGNMENT INSTRUCTIONS
4-1. MAIN TUNER AFT
1. STANDARD B/G
1) S et a signal generator w ith
- R F FR E Q U E N C Y = 38.9 M H z
- R F O U TP U T LE V E L = 80 5 dB uV
2) C onnect the signal generator R F output to TP 1 ( TU N E R IF O U TP U T )
T here m ust be no signal input to the TU N E R .
3) P ress the "V C O " K E Y and w ait until the TV screen display "A FT O K "
4-2. SUB TUNER AFT
1. STANDARD B/G
1) S et a signal generator w ith
- R F FR E Q U E N C Y = 38.9 M H z
- R F O U TP U T LE V E L = 80 5 dB uV
2) C onnect the signal generator R F output to TP 2 ( TU N E R IF O U TP U T )
3) C onnect the D C voltage m eter to T P 3.
4) A djust L201 ( A FT C O IL ) for 2.2V 0.1V.
4-3. MAIN TUNER AGC
1) S et a P attern G enerator w ith R F level 60 2 dB uV, 210.25 M H z.
2) C onnect a O S C ILLO S C O P E P R O B E to P 101 ( TU N E R A G C IN P U T ).
3) A djust A G C U P /D O W N K E Y the voltage drop about 1.8V D C over below it's m axim um voltage.
4-4. SUB TUNER AGC
1)
S et a P attern G enerator w ith R F level 60 2 dB uV, 210.25 M H z.
2) C onnect a O S C ILLO S C O P E P R O B E to P 101 ( TU N E R A G C IN P U T ).
3) P ress the "S U B A G C " K E Y and m onitoring the S U B TU N E R P IC TU R E .
4) A djust R 202 ( S U B A G C V R ) the voltage drop about 1.8V D C over below it's m axim um voltage.
4-5. SCREEN
1) A pply a C O LO R B A R PATTE R N S IG N A L.
2) P ress the "S C R E E N " K E Y .
3) C onnect a O S C ILLO S C O P E P R O B E to P 906 ( C R T C ATH O D E R ,G ,B )
4) A djust the screen volum e on FB T such that the highest black level voltage 130 5V dc .
7
4-6. WHITE BALANCE
1) A pply a C O LO R B A R PATTE R N S IG N A L.
2) A djust the R ,G ,B U P /D O W N K E Y of the other color w hich did not appear on the screen to obtain W H ITE .
4-7. FOCUS
1) A pply a R E TM A PATT E R N S IG N A L.
2) A djust the FO C U S V O LU M E on FB T to obtain optim al resolution.
4-8. GEOMETRY
1. S-CORRECTION
1) A pply a C R O S S H ATC H PAT TE R N S IG N A L.
2) A djust the S -C O R R U P /D O W N K E Y obtain
the sam e distance betw een horizontal lines.
2. VERTICAL SLOPE
1) A pply a R E TM A PATT E R N S IG N A L.
2) P ressing the V -S LO P E +/- K E Y,the
low er half of the screen is blanked.
2) A djust the border line of blanked picture
coincident w ith the center m arks of the
pattern using the V -S LO P E + /- K E Y.
3. VERTICAL CENTER
1) A pply a R E TM A PATT E R N S IG N A L.
2) A djust the center line of pattern coincident
w ith the m echanical center m arks of the
C R T using the V -C E N TE R +/- K E Y.
4. VERTICAL SIZE
The V -C E N TE R adjustm ent has to be
done in advance.
1) A pply a R E TM A PATT E R N S IG N A L.
2) A djust the upperside of the pattern coincident
w ith the m echanical center m arks of the
C R T using the V -S IZE +/- K E Y.
5. HORIZONTAL CENTER
1) A pply a R E TM A PATT E R N S IG N A L.
2) A djust picture centering w ith H -C E N TE R +/- K E Y.
8
4-9. ADJUSTMENT
1. X-POSITION AND P2,P3 ADJUSTMENT
1) A djust point : X -P O S ITIO N
C hecking point : oscilloscope ch1 = H /S W (P Y 04 #6)
oscilloscope ch2 = P B E N V E (P Y 04 #4)
Triggering : C H 1
M easuring E quipm ent : oscilloscope, path jig
M ode : P LAY B A C K ,ATK O FF
Test tape : D P -2 (6K H z)
CONNECTION METHODE
PY04 OSCILLOSCOPE 1
ADJUST JIG
4
CH2
6 CH1
OSCILLOSCOPE 2
P601
3 CH1
2
1 GND
Adjustm ent Procedure
1) C onnect the PATH JIG to P Y 04 after Test tape P LAY B A C K
2) P ressing the "ATK O F F" K E Y.
3) Insert the D P -2 TA P E . ( A uto playback)
3) A djust the w aveform of P B E N V E to m axim um (figure1) using X -position V R .
4) A djust IN /O U TP U T G U ID E until the exact w aveform appear as bellow figure2.
m ax.
(figure 1) (figure 2)
9
2. AUTO PG ADJUSTMENT
1) A fter adjustm ent of 9-1. P ress the " R E C ." button.
2) E ject the Test tape.
3. AZIMUTH ADJUSTMENT
1) A djust point : A ZIM U TH S C R E W
C hecking point : S O U N D O U TP U T (P 601)
M easuring E quipm ent : oscilloscope or audio level m eter.
M ode : P LAY B A C K
Test tape : D P -2 (6K H z)
Adjustm ent Procedure
1) C onnect the m easuring equipm ent to the A U D IO O U TP U T (P 601) term inal.
2) A fter test tape playback, adjust the output level m axim ally by varing the azim uth screw.
( 6K -3.8 m +1 m /-3 m )
3) F ix the azim uth screw w ith locking paint.
If E E P R O M ( I703 ) has been changed :
- O ption data has to be changed and
- all alignm ent function has to be readjusted.
SECAM-L AFT
1. MAIN TUNER AFT
1.1 S TA N D A R D S E C A M -L
1) S et a signal generator w ith
- R F FR E Q U E N C Y = 34.5 M H z
- R F O U T P U T LE V E L = 80 5 dB uV
2) C onnect the signal generator R F output to TP 1 ( TU N E R IF O U TP U T )
T here m ust be no signal input to the TU N E R .
3) P ress the "V C O -L" K E Y and w ait until the TV screen display "A FT-L O K "
2. SUB TUNER AFT
2.1 S TA N D A R D S E C A M -L
1) S elect the P R . of received S E C A M -L
2) S et a signal generator w ith
- R F FR E Q U E N C Y = 34.2 M H z
- R F O U T P U T LE V E L = 80 5 dB uV
3) C onnect the signal generator R F output to TP 2 ( TU N E R IF O U TP U T )
4) C onnect the D C voltage m eter to T P 3.
5) A djust R 240 ( A FT V R ) for 2.2V 0.1V.
10
5. SERVICE REMOCON DIAGRAM
5-1. HOW TO CHECK TV SECTION WITHOUT VCR DECK
IF Y O U W A N T TO C H E C K T V S E C T IO N W ITH O U T D E C K M E C H A N IS M , TH E N P LE A S E P E R FO R M
IN TH IS O R D E R .
1. P U LL O U T T H E P O W E R C O R D .
2. R E M O V E TH E V C R D E C K M E C H A N IS M .
3. S U P P LY TH E M A IN P O W E R . (M A IN S W O N )
4. W A IT FO R A B O U T 10 S E C O N D S . (Y O U C A N S E E T H E LIG H T O F P O W E R LE D IF TH E T V IS N O R M A L)
5. TU R N O N T H E T V U S IN G TH E R E M O C O N .(Y O U C A N S E E T H E O S D `E M E R G E N C Y ')
6. C H E C K TH E TV S E C TIO N .
5-2. REMOCON
5th
+ + +
4th R G B
+ 1 - 2 - 3 -
3rd S-CORR
- 4 + 5 + 6 +
2nd V-CEN V-SIZE V-SLOP
+ 7 - 8 - 9 -
1st H-CEN REC ATK OFF SUB AGC
- 0
+
AGC
-
AFT
AFT-L
SCREEN LANGUAGE
To Enter The " SERVICE MODE "
Press blue, yellow, green, red power buttons in regular sequency within five seconds using USER
REMOCON after seting TV/VCR off.
11
5-3. REFER TO GENERAL ADJUSTMENT
1. S-CORR +/- ( S-CORRECTION )
P ress this button to adjust the sam e distance betw een horizontal lines on screen of crosshatch pattern.
2. H-CENTER +/- ( HORIZONTAL CENTER )
P ress this button to adjust picture centering w ith H -center on screen of R E TM A pattern.
3. V-CENTER +/- ( VERTICAL CENTER )
P ress this button to adjust the center line of the pattern coincident w ith the m echanical center m arks of the
C R T on screen of R E T M A pattern.
4. V-SIZE +/- ( VERTICAL SIZE )
P ress this button to adjust the upperside of the pattern coincident w ith the m echanical
center m arks of the C R T on screen of R E TM A pattern.
5. V-SLOPE +/- ( VERTICAL SLOPE )
P ress this button to adjust the border line of blanked picture coincident w ith the center
m arks of the pattern.
6. R,G,B +/- ( W HITE BALANCE )
The screen is becom e W H ITE adjusted R ,G ,B level by this button.
7. ATK OFF ( Auto tracking off )
P ress this button to adjust X -PAT H adjustm ent.
FR O N T panel's LE D s are lighted up if you press this button. ( w ithout TA P E )
8. SUB AGC
P ress this button to adjust S U B TU N E R A G C A djustm ent.
P ress once : picture is displayed colour pattern.
P ress tw ice : picture is displayed black/w hite pattern.
9. REC
P ress this pattern to adjust A U TO P G A djustm ent.
10. LANGUAGE
P ress this button to adjust LA N G U A G E S E LE C TIO N .
12
11. SCREEN
P ress this button to adjust the screen volum e on FB T.
12. AGC +/-
P ress this button to adjust M A IN TU N E R A G C .
13. AFT
P ress this button to adjust V C O .
14. AFT-L
P ress this button to adjust V C O -L. ( only use the S E C A M -L m odel. )
15. POW ER
P ress this button to turn your TV /V C R on or off.
If you forget your " child lock secret N o. "
1. E nter the " S E R V IC E M O D E . "