DAEWOO DSC-3210E Service Manual
Service Manual
Color Television
CHASSIS : SC-140
Model : DSC-3210E
S/M No. : DSC140BEF0
Jul. 2002
D AEW OO ELECTR ONICS CO., LTD
http : //svc.dwe .co.kr
Service manual SC-140
-1-
Contents
1 - Main features ........................................................................................................................................................ 4
1-1 Specifications .................................................................................................................................................. 4
1-2 Channel table .................................................................................................................................................. 8
1-3 ATSS sorting method ....................................................................................................................................... 11
2 - Safety instruction ................................................................................................................................................. 13
3 - Alignment instructions ........................................................................................................................................ 14
3-1 Microcontroller configuration : Service mode ................................................................................................... 14
3-2 Service mode navigation ................................................................................................................................. 14
3-3 Microcontroller configuration : Option .............................................................................................................. 15
3-4 TV set Alignment ............................................................................................................................................. 15
3-4-1 Local oscillator alignment .................................................................................................................... 15
3-4-2 G2 alignment ....................................................................................................................................... 15
3-4-3 White balance ..................................................................................................................................... 15
3-4-4 Focus .................................................................................................................................................. 15
3-4-5 Vertical geometry ................................................................................................................................ 15
3-4-6 Horizontal picture centring................................................................................................................... 16
3-4-7 East/West correction ........................................................................................................................... 16
3-4-8 AGC .................................................................................................................................................... 17
4 - IC description ....................................................................................................................................................... 18
4-1 VCT383xA TV signal processor - Teletext decoder with embedded 8 bit -
Controller ............................................................................................................................................................ 18
4-1-1 Block diagr am off the VCT ................................................................................................................... 18
4-1-2 TV -signal Processor ........................................................................................................................... 18
4-1-2 -Controller
......................................................................................................
.
...................................
1
9
4-1-4 Teletext Features ................................................................................................................................ 19
4-1-5 Displaty OSD F eatures...................................................................................................................... 20
4-1-6 Audio Features ................................................................................................................................... 20
4-1-7 General Features ............................................................................................................................... 20
4-1-8 Data Capture ....................................................................................................................................... 20
4-1-9 Data Capture Features ........................................................................................................................ 20
4-1-10 TV processor version and -Controller capacity .............................................................................. 21
4-1-11 IC marking and version ....................................................................................................................... 21
4-1-12 Pinning ................................................................................................................................................ 21
4-2 MSP341x Multistandard Sound Processor ................................................................................................... 24
4-2-1 Basic F eatures of the MSP 341x ......................................................................................................... 24
4-3 TDA4470 - Multistandard Video-IF and Quasi P arallel Sound Processor ...................................................... 28
4-3-1 Description .......................................................................................................................................... 28
4-3-2 Features .............................................................................................................................................. 28
4-3-3 Pinning ................................................................................................................................................ 28
4-3-4 Block diagram .................................................................................................................................... 29
4-4 T D A894xJ Stereo A udio Amplifier ........................................................................................ ......................... 30
4-4-1 Features ............................................................................................................................................... 30
4-5 TDA835xJ Vertical Amplifier ........................................................................................................................... 32
4-5-1 TDA8357J ........................................................................................................................................... 32
Service manual SC-140
-2-
4-5-2 TDA8358J ..............................................................................................................................................33
4-6 TDA6107Q.......................................................................................................................................................... 35
4-7 24C16 - 16 Kb EEPROM .................................................................................................................................... 37
4-8 STR - F6654 ....................................................................................................................................................... 38
4-8-1 General description ............................................................................................................................... 38
4-8-2 Features................................................................................................................................................. 38
4-8-3 Block diagram .......................................................................................................................................38
4-8-4 Pin description ...................................................................................................................................... 39
4-8-5 Control part - electrical characteristics ................................................................................................. 39
4-8-6 MOSFET electrical characteristics .......................................................................................................40
5 - Circuit description.................................................................................................................................................. 41
5-1 Block diagram....................................................................................................................................................41
5-2 IF section............................................................................................................................................................42
5-2-1 Block diagram .......................................................................................................................................42
5-2-2 Vision IF Amplifier .................................................................................................................................. 42
5-2-3 Tuner-and VIF-ACG ................................................................................................................................ 43
5-2-4 FPLL, VCO and AFC.............................................................................................................................. 43
5-2-5 Video Demodulation and Amplifier ...................................................................................................... 44
5-5-6 Sound IF Amplifier and SIF-AGC ....................................................................................................... 44
5-2-7 Quasi-Parallel-Sound (QPS) Mix er ......................................................................................................... 44
5-2-8 Standard Switch .................................................................................................................................... 44
5-2-9 L Switch.................................................................................................................................................. 44
5-2-10 Internal Voltage Stabiliser ..................................................................................................................... 44
5-3 Video - VCT description ......................................................................................................................................45
5-3-1 Introduction ............................................................................................................................................45
5-3-2 Video Front-end..................................................................................................................................... 45
5-3-3 Input Selector........................................................................................................................................ 45
5-3-4 Clamping ................................................................................................................................................45
5-3-5 A utomatic Gain Control ........................................................................................................................ 45
5-3-6 Digitally Controlled Clock Oscillator..................................................................................................... 45
5-3-7 Analogue Video Output ........................................................................................................................ 45
5-3-8 Adaptiv e Comb Filter (VCT3834A only)................................................................................................ 46
5-3-9 Color Decoder ....................................................................................................................................... 46
5-3-10 Horizontal Scaler ................................................................................................................................... 46
5-3-11 Video Sync Processing ........................................................................................................................ 47
5-3-12 Display Processing................................................................................................................................ 47
5-3-13 Chroma Transient Improvement............................................................................................................ 47
5-3-14 Video Back-end ..................................................................................................................................... 47
5-3-15 CRT Measurement and Control........................................................................................................... 48
5-3-16 Average Beam Current Limiter ............................................................................................................. 48
5-3-17 Analogue RGB Insertion ...................................................................................................................... 48
5-3-18 Fast-Blank Monitor ................................................................................................................................ 48
5-3-19 Vertical and East/West Deflection ....................................................................................................... 48
5-3-20 EHT Compensation ................................................................................................................................ 49
5-3-21 Reset Function ...................................................................................................................................... 49
5-3-22 Standby and Pow er-On ........................................................................................................................ 49
5-4 Micro-controller......................................................................................................................................................... 49
Service manual SC-140
-3-
Fo
5-4-1 Introduction........................................................................................................................................... 49
5-4-2 CPU ...................................................................................................................................................... 49
............................................................................... 50
5-4-4 Tuning .................................................................................................................................................. 50
5-4-5 Automatic rmat switching and WSS ...................................................................................... ......... 50
5-4-6 EXTERNAL source control logic........................................................................................................... 52
5-4-7 Over Current Protection........................................................................................................................ 53
5-5Teletext Display ................................................................................................................................................. 53
5-6 Sound processing............................................................................................................................................... 54
5-6-1 Analogue sound IF-input section............................................................................................................ 54
5-6-2 Quadrature Mixers ................................................................................................................................ 54
5-6-3 Phase and AM discr imination........................................................................................................... 54
5-6-4 NICAM decoder.................................................................................................................................... 55
5-6-5 DSP section.......................................................................................................................................... 55
5-6-6 Sound Mode switching.......................................................................................................................... 55
5-7 Sound amplification........................................................................................................................................... 55
5-7-1 Power amplifier..................................................................................................................................... 55
5-7-2 Mode selection....................................................................................................................................... 56
5- 8 Vertical deflection............................................................................................................................................. 56
5-8-1 Flyback voltage..................................................................................................................................... 56
5-8-2 Protection.............................................................................................................................................. 56
5-8-3 Guard circuit.......................................................................................................................................... 56
5-8-4 Damping resistor................................................................................................................................... 56
5-8-5 EAST-WEST Amplifier (TDA8358J only)............................................................................................... 56
5-9 Po wer supply (STR F6653).. .............................................................................................................................. 57
5-9-1 STR-F6654 generaral description......................................................................................................... 57
5-9-2 Power supply primary part operations................................................................................................... 57
5-10TV start-up,TV normal run and stand by mode operations............................................................................... 61
5-10-1 TV start-up operations.......................................................................................................................... 61
5-10-2 TV normal r un and stand-by mode operations....................................................................................... 62
6 - Service parts list.. ................................................................................................................................................. 67
7 - Exploded Vie w ........................................................................................................................................................ 76
..............................................................................................................
.......................................... 77
..............................................................................................................
.......................................... 78
8 - PCB Layout
9 - Circuit Diagram
5-4-3
-Controller I/O pin configuration and function
Service manual SC-140
-4-
1- Main Featur e s
1-1 Specifications
TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/LÕ
Sound system NICAM B/G, I, D/K, L,
FM 2Carrier B/G, D/K
Power consumption
Sound Output Pow
er
32" : 7W x2 (at 1KHz, 60% mod, 10% THD)
Speaker
32" : 12W 8 ohm x2
Teletext system
10 pages memory FASTEXT (FLOF or TOP)
Aerial input
75 ohm unbalanced
Channel coverage
Off-air channels, S-cable channels and hyperband
Tuning system
frequency synthesiser tuning system
V
isual screen
32" : 76Cm
Channel indication On Screen Display
program Selection 100 programmes
Aux. terminal
Remote Control Unit R-46G22
32" 16:9 FST : 95W approx.
32" 16:9 Real Flat : 95W approx.
EURO-SCART 1 : Audio / Video In and Out, R/G/B In, Slow and
Fast switching.
EURO-SCART 2 : Audio / Video In and Out, SVHS In.
AV3 : Audio-Video Jack on front of cabinet.
Headphone jack (3.5 mm) on front of cabinet
SVHS3 (option) : Jack on front of cabinet - sound input
common wit
h AV3.
Monitor Out(option)
Service Manual SC-140
Specification Matrix
Chassis Name SC-140
VCT Version 3834
Software Version A
Remote Control R46G22
PCB Serial Number 4859809424
Tube 16:9 FST / 16:9 Real Flat
SVHS 3
“picture Improvements, Comb
Filter, Horizontal Scaler”
Teletext Split Screen
Formats Available in Video Mode Atuo / 4:3 / 14:9 / Zoom 14:9/ Zoom 16:9 / Full Screen
AV2 Monitor Output
MSP Version (Option) 3410
Sound Dffects Off / Spatial
Graphic Equalizer
AV3 Audio Input Dedicated
Teletext Page Memory 10 Page
Top Teletext Available : Selectable in factory / Service mode by option bits
Flof Teletext Available : Selectable in factory / Service mode by option bits
Text Character Support “Pan-European Latin, Cyrillic, Greek”
OSD Languages “English, French, German, Italian, Spanish, Dutch, Finnish,
Norwegian, Swedish, Greek, Polish, Czech, Slovakian,
Romanian, Russian.”
Tuner Options “Philips, Alps, Partsnic”
- 5 -
Service manual SC-140
-6-
21 Pin EURO-SCART 1 :
Pin Signal Description Matching value
1 Audio Output Right 0.5 Vrms, Impedance < 1 , ( RF 54% Mod )
2 Audio Input Right 0.5 Vrms, Impedance > 10
3 Audio Output Left 0.5 Vrms, Impedance < 1 , ( RF 54% Mod )
4 Audio Earth
5 Blue Earth
6 Audio Input Left 0.5 Vrms, Impedance > 10
7 Blue Input 0.7 Vpp ±0.1V, Impedance 75
8 Slow Switching TV : 0 to 2V, AV 16/9 : 4.5 to 7V, AV 4/3 : 9.5 to 12V ,
Impedance > 10
9 Green Earth
10 N.C.
11 Green Input 0.7 Vpp 0.1V, Impedance 75
12 N.C.
13 Red Earth
14 Blanking Earth
15 Red Input 0.7 Vpp 0.1V, Impedance 75
16 Fast Switching 0 to 0.4V : Logic “0”, 1 to 3V : Logic “1”, Impedance 75
17 Video Out Earth
18 Video In Earth
19 Video Output 1 Vpp 3dB, Impedance 75
20 Video Input 1 Vpp 3dB, Impedance 75
21 Common Earth
21 Pin EURO-SCART 2 :
Pin Signal Description Matching value
1 Audio Output Right 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) - Not available for cp885
2 Audio Input Right 0.5 Vrms, Impedance > 10
3 Audio Output Left 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) - Not available for cp885
4 Audio Earth
5 Earth
6 Audio Input Left 0.5 Vrms, Impedance > 10
7 N.C.
8 Slow Switching TV: 0 to 2V, AV 16:9: 4.5V to 7V, AV 4:3: 9.5 to 12V
9 N.C.
10 N.C.
11 N.C.
12 N.C.
13 Earth
14 Earth
15 Chroma Input 3dB for a luminance signal of 1 Vpp
16 N.C.
17 Earth
18 Video In Earth
Service manual SC-140
-7-
19 Video Output 1 Vpp 3dB, Impedance 75 ( Monitor output ) - Not available for cp885
20 Video Input, Y In. 1 Vpp 3dB, Impedance 75
21 Common Earth
Service manual SC-140
-8-
CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT
C01 46.25 - 47.75 49.75
C02 48.25 55.75 (L’) 53.75 59.25
C03 55.25 60.5 (L’) 61.75 77.25
C04 62.25 63.75 (L’) 175.25 85.25
C05 175.25 176.00 183.25 93.25
C06 182.25 184.00 191.25 175.25
C07 189.25 192.00 199.25 183.25
C08 196.25 200.00 207.25 191.25
C09 203.25 208.00 215.25 199.25
C10 210.25 216.00 223.25 207.25
C11 217.25 189.25 (LUX) 231.25 215.25
C12 224.25 69.25 (L’) 239.25 223.25
C13 53.75 76.25 (L’) 247.25 C14 - 83.25 (L’) 49.75 C15 82.25 90.25 57.75 C16 - 97.25 65.75 C17 183.75 - 77.75 C18 192.25 - 85.75 C19 201.25 - - C20 -- - C21 471.25 471.25 471.25 471.25
C22 479.25 479.25 479.25 479.25
C23 487.25 487.25 487.25 487.25
C24 495.25 495.25 495.25 495.25
C25 503.25 503.25 503.25 503.25
C26 511.25 511.25 511.25 511.25
C27 519.25 519.25 519.25 519.25
C28 527.25 527.25 527.25 527.25
C29 535.25 535.25 535.25 535.25
C30 543.25 543.25 543.25 543.25
C31 551.25 551.25 551.25 551.25
C32 559.25 559.25 559.25 559.25
C33 567.25 567.25 567.25 567.25
C34 575.25 575.25 575.25 575.25
C35 583.25 583.25 583.25 583.25
C36 591.25 591.25 591.25 591.25
C37 599.25 599.25 599.25 599.25
C38 607.25 607.25 607.25 607.25
C39 615.25 615.25 615.25 615.25
C40 623.25 623.25 623.25 623.25
C41 631.25 631.25 631.25 631.25
1-2 Channel table
FREQUENCY TABLE
Service manual SC-140
-9-
CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT
C42 639.25 639.25 639.25 639.25
C43 647.25 647.25 647.25 647.25
C44 655.25 655.25 655.25 655.25
C45 663.25 663.25 663.25 663.25
C46 671.25 671.25 671.25 671.25
C47 679.25 679.25 679.25 679.25
C48 687.25 687.25 687.25 687.25
C49 695.25 695.25 695.25 695.25
C50 703.25 703.25 703.25 703.25
C51 711.25 711.25 711.25 711.25
C52 719.25 719.25 719.25 719.25
C53 727.25 727.25 727.25 727.25
C54 735.25 735.25 735.25 735.25
C55 743.25 743.25 743.25 743.25
C56 751.25 751.25 751.25 751.25
C57 759.25 759.25 759.25 759.25
C58 767.25 767.25 767.25 767.25
C59 775.25 775.25 775.25 775.25
C60 783.25 783.25 783.25 783.25
C61 791.25 791.25 791.25 791.25
C62 799.25 799.25 799.25 799.25
C63 807.25 807.25 807.25 807.25
C64 815.25 815.25 815.25 815.25
C65 823.25 823.25 823.25 823.25
C66 831.25 831.25 831.25 831.25
C67 839.25 839.25 839.25 839.25
C68 847.25 847.25 847.25 847.25
C69 855.25 855.25 855.25 855.25
C70 863.25 863.25 863.25 863.25
C71 69.25 - - -
C72 76.25 - - -
C73 83.25 - - -
C74 90.25 - - -
C75 97.25 - - -
C76 59.25 - - -
C77 93.25 - - -
S01 105.25 104.75 103.25 105.25
S02 112.25 116.75 111.25 112.25
S03 119.25 128.75 119.25 119.25
S04 126.25 140.75 127.25 126.25
S05 133.25 152.75 135.25 133.25
S06 140.25 164.75 143.25 140.25
S07 147.25 176.75 151.25 147.25
S08 154.25 188.75 159.25 154.25
S09 161.25 200.75 167.25 161.25
Service manual SC-140
-10-
CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT
S10 168.25 212.75 - 168.25
S11 231.25 224.75 - 231.25
S12 238.25 236.75 - 238.25
S13 245.25 248.75 255.25 245.25
S14 252.25 260.75 263.25 252.25
S15 259.25 272.75 271.25 259.25
S16 266.25 284.75 279.25 266.25
S17 273.25 296.75 287.25 273.25
S18 280.25 136.00 295.25 280.25
S19 287.25 160.00 303.25 287.25
S20 294.25 - - 294.25
S21 303.25 303.25 - 303.25
S22 311.25 311.25 311.25 311.25
S23 319.25 319.25 319.25 319.25
S24 327.25 327.25 327.25 327.25
S25 335.25 335.25 335.25 335.25
S26 343.25 343.25 343.25 343.25
S27 351.25 351.25 351.25 351.25
S28 359.25 359.25 359.25 359.25
S29 367.25 367.25 367.25 367.25
S30 375.25 375.25 375.25 375.25
S31 383.25 383.25 383.25 383.25
S32 391.25 391.25 391.25 391.25
S33 399.25 399.25 399.25 399.25
S34 407.25 407.25 407.25 407.25
S35 415.25 415.25 415.25 415.25
S36 423.25 423.25 423.25 423.25
S37 431.25 431.25 431.25 431.25
S38 439.25 439.25 439.25 439.25
S39 447.25 447.25 447.25 447.25
S40 455.25 455.25 455.25 455.25
S41 463.25 463.25 463.25 463.25
Service manual SC-140
-11-
1-3 ATSS sorting method
The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling software for each
program checks if a VPS CNI code is transmitted ( this system exists for German, Swiss and Austrian transmissions).
If no VPS CNI code is found, then the system check if a CNI code is transmitted as part of the teletext transmission
( Packet 8/30 format 1 ). If such a code ( VPS or teletext ) is found and if this code is in the ATSS list, the program is
automatically named.
If the transmission does not have VPS CNI, and no teletext service is available, then there is no possibility of the
program being automatically named.
The programs found are then sorted in 4 groups :
Group I : It contains all the pro grams from the selected country and named by the TV controlling software. Within this
group the sorting order is fixed by the ATSS list.
Group II : It contains all the pro grams with a strong signal strength which are not listed in group I.
Group III : It contains all the pro grams with a weak signal strength which are not listed in group I.
Group IV : If two or more programs with the same code are found, only the strongest ( or if they have the same level
the one with the lowest frequency) is listed in group I, II or III. The others are listed in group IV.
Program
number
1
2 Group I
...
n
n+1
... Group II
m
m+1
... Group III
p
p+1
... Group IV
q
q+1
.... not used
99
0
Group
Skip
Program
number
1
... Group II
m
m+1
... Group III
p
p+1
... Group IV
q
q+1
.... not used
99
0
Group
Skip
Special case : Country selection = Others
Special case : France
Note : If two programs with the same name but a different code ar e found these two programs are listed in
gr oup I, II or III ( e.g. Regional program SW3 in Germany ).
Service manual SC-140
-12-
The sor ting order within group II, III, and IV is based on the channel frequency. The Pro gram with the lo west
frequency is allocated the first rank in its group, and so f orth until the last program of the group which has the
highest fr equency.
If France is selected, the TV controlling softw are first swe eps all TV bands with Fr ance system selected
( positive video modulation) and the a second time with Europe system selected ( negative video modulation).
Special case : Switzerland
If Switzerland is selected the TV controlling softw are f irst s weeps all TV bands with Eur ope system selected
(negative video modulation) and then a second time with France system selected ( positive video modulation).
Special case : GB
Note for sa tellite recei ver users : Before starting ATSS tur n On your satellite r ecei ver and tune “ SKY NEWS ”.
If GB is selected the TV controlling software seeks for programs only in UHF ( C21 to C70 ).
The sorting order is :
1 - BBC1
2 - BBC2
3 - ITV
4 - CH4
5 - CH5
6 - NEWS
If two or more “ identical” pr ograms ( same name but different code e.g. BBC1 and BBC1 Scotland ) are found
the following pro grams in the list will be shifted up. (1 - BBC1, 2 - BBC1, 3 - BBC2, 4 -ITV, 5 - CH4, 6 - CH5,
7 - NEWS, ..)
If one of the progr am abo ve is not f ound, the associated program number remains empty
( freq.=467.25 Mhz - Skip selected - no name - system=GB).
example A : 1 - BBC1, 2 - BBC2, 3 - ITV , 4 - ----, 5 - CH5, 6 - NEW S , ...
example B ( if 2 BBC1 found ) : 1 - BBC1, 2 - BBC1, 3 - BBC2, 4 - IT V, 5 - -----, 6 - CH5, 7 -NEWS, ...
Special case : France
Service Manual SC-140
2. Safety instruction
WARNING : Only Competent Service personnel may carry out work involving the testing or repair of this equipment.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce petentially hazardous X-RAY RADIATION. To avoid such hazards, the high
voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is
26KV(21” - 29”) at max beam current. The high voltage must not, under any circumstances,
exceed 29.5KV (21" - 25”) or 30KV (28” - 29"). Each time a receiver requires servicing, the high voltage
should be checked. It is important to use an accurate and reliable high voltage meter.
2. The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-RAY RADIATION
protection, the replacement tube must be exactly the same type tube as specified in the parts list.
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 board removed involves a shock hazard from the receiver.
1) Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions mecessary
when working on high voltage equipment.
2) Discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated
and if broken, glass fragments will be violently expelled.
2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.
3. When replacing a gigh wattage resistor ( metal oxide film resistor) in the circuit board, keep the resistor 10 mm
away from circuit board.
4. Keep wires away from high voltage or high temperature components.
5. This receiver must operate under AC 220~240 volts, 50Hz. NEVER connect to DC supply or any other power or
frequency.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this equipment have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection
afforded by them cannot necessarily be obtained by using replacement 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.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitutes
replacement parts which do not have the same safety characteristics as specified in the parts list may create X-RAY
Radiation.
- 13 -
Service manual SC-140
-14-
3 - Alignment instructions
3-1 Microcontroller configuration : Service mode
To switch the TV set into service mode please see instruction below.
1 - Select pr. number 91
2 - Adjust sharpness to minimum and exit all menu.
3 - Quickly press the key sequence : RED - GREEN - menu
To software version is displayed beside the word Service, e.g. “ SERVICE V1.00A”.
To exit SERVICE menu press menu key or Std By key.
3-2 Service mode navigation
Pr Up / Down remote k eys : cycle through the service items available.
Vol- / + remote keys : Decrement / Increment the values within r ange.
0~7 digit keys : Toggle bits 0~7 in option byte
Order Item
Default settingh for wp 895
1 PARABOLA
+140
2 HOR WIDTH
-1100
3 CORNER
-80
4 HOR.PARAL
-1
5 V.LINEAR
-2
6 EW TRAPEZ
-12
7 S CORRECT
-15
8 H BOW
+100
9 VERT SIZE
+145
10 VERT CENT
+3939
11 RED GAIN
+92
12 GRN GAIN
+87
13 BLUE GAIN
+95
14 RED BIAS
+128
15 GRN BIAS
+128
16 HOR CEN
98
17 AGC LEVEL
-
18 G2-SCREEN
-
19 AFT
-
20 OPTION
-
21 MAX VOL
Not used
Service manual SC-140
-15-
3-3 Microcontroller configuration : Option bits
These option bits are available from Service mode. First find the OPTION control, and then use keys 0...7 on the
remote keypad to control bits 0 to 7 respectively. The table below shows the options a vailable ;
1
0
B7 B6
TOP text
off
FASTEXT
/FLOF off
TOP textonFASTEXT
(FLOF) on
B5 B4 B3 B2 B1 B0
TUBE 4:3 X
TUBE 16:9 X
SVHS3
disable
Tuner options
00=Philips
01=ALPS
10=Philips (AGC intern)
11=Not used.
SVHS3
enable
X
Set all the unused bits, markde 'X', to be 0 for future compatibility.
3-4 TV set Alignment
3-4-1- Local oscillator alignment
Tune a colour bar pattern. The Frequency of the signal carrier must be accurate (Max +/- 10khz deviation fron the
nominal channel frequency).
Find "AFT" item in service mode.
Adjust the coil L150 to bring the cursor to central position : 32.
3-4-2- G2 alignment
- Tune a colour bar pattern.
- Find the "G2 - SCREEN" item in service mode.
- Adjust screen volume (on FBT) to bring the cursor to central position : 32.
3-4-3- White balance
- Select a dark picture and adjust RED BIAS and GRN BIAS to the desired colour temperature.
- Select a bright picture and adjust REC, GRN and BLUE GAIN to the desired dolour temperature.
3-4-4- Forcus
Adjust the Forcus volume (on FBT) to have the best resolution on screen.
3-4-5- Vertical geometry
Adjust V.LINEAR (linearity), S CORRECT
(S. Corrention), VERT SIZE (Vertical amplitude),
VERT CENT (vertical centing) to compensate
for vertical distortion.
Service manual SC-140
-16-
HOR PARAL
H BOW
HOR WIDTH
PARAROLA
3-4-6- Horizontal picture centring
Adjust HOR CEN(Horizontal center) to have the picture in the center of the screen.
3-4-7- Eau/West comection
Adjust the PARABOLA, HOR WIDTH, CORNER, HOR PARAL, EW TRAPEZ, H BOW, to compensate for
geometrical distorrin,
For HOR WIDTH, adjust for 91% overscan.
Service manual SC-140
-17-
CORNER
EW TRAPEZ
3-4-8- AGC
- Adjust the antenna signal level at 70 dB V 2
- Tune a colour bar pattern.
- Find the “AGC” item in service mode.
- Adjust AGC volume ( RB10 ) to bring the cursor to central position : 32.
Service manual SC-140
-18-
4 - IC description
4-1 VCT383XA TV signal processor - Teletext decoder with embedded 8 bit - Controller.
4-1-1- Block diagram of the VCT
4-1-2- TV-signal Processor
Four composite video inputs, two S-VHS inputs
Analogue YC r C b input
Composite video monitor
Multistandard colour decoder ( 1 crystal )
Multistandard sync decoder
Black-line detector
Adaptive 2H comb filter Y/C separator
Service manual SC-140
-19-
Horizontal scaling ( 0.25 to 4 )
Panoramavision
Black-level expander
Dynamic peaking
Soft limiter (gamma correction)
Colour transient improvement
Programmable RGB matrix
Analogue RGB/Fastblank input
Half-contrast switch
Picture frame generator
Scan velocity modulation output
High-performance H/V deflection
Angle and bow correction
Separate ADC for tube measurements
EHT compensation
4-1-3- -Controller
8-bit, 10-Mhz CPU (65C02)
96 kB program ROM on chip
1 kB program RAM on chip
memory banking
16-input, 16-level interrupt controller
patch module for 10 ROM locations
two 16-bit reloadable timers
capture compare module
watchdog timer
14-bit PWM for voltage synthesis
Four 8-bit PWMs
10-bit ADC with 15:1 input MUX
I2C bus master interface
24 programmable I/O ports
80C51
-controller core standard instruction set and timing
1 s machine cycle
32-128Kx8-bit late programmed ROM
3-12Kx8-bit Auxiliary RAM (shared with Display and Acquisition)
Interrupt controller for individual enable/disable with two level priority
Two 16-bit Timer/Counter registers
WatchDog timer
Auxiliary RAM page pointer
16-bit Data pointer
IDLE and Power Down (PD) mode
14 bits PWM for Voltage Synthesis Tuning
8-bit A/D converter
4 pins which can be programmed as general I/O pin, ADC input or PWM (6-bit) output
4-1-4- Teletext Features
Four programmable video inputs
Adapt ive data slicer
Signal quality detection
WST, PDC, VPS, and WSS acquisition
Service manual SC-140
-20-
High-level command language
FLOF (Fastext), and TOP support
10 pages memory on chip (10kB)
4-1-5- Display OSD Features
3kB OSD RAM on chip
WST level 1.5 compliant
WST level 2 parallel attributes
32 foreground/background colours
programmable colour look-up table
1024 mask programmable characters
17 national languages
(Latin, Cyrillic and Greek caracter sets)
Character matrix 10x10
4-color mode for user font
4-1-6- Audio Features
Three mono inputs
Two mono outputs
Programmable channel select
Volume control for one mono channel
4-1-7- General Features
Submicron CMOS technology
Low-power standby mode
Single 20.25 MHz crystal
64-pin PSDIP package
4-1-8- Data Capture
The Video Front End section takes in the analogue Composite Video and Blanking Signal (CVBS), and from this
extracts the required data, w hich is then decoded and stored in memory.
The extraction of the data is performed in the digital domain. The first stage is to select and convert the analogue
CVBS signal into a digital form. This is done using 8 bit ADC sampling at 20.25 Mhz.
The digital data services transmitted in the VBI are selected and acquired separately form the video part. This is done
by the use of an adaptive data slicer. The following data types can be extracted : 625 line World System Teletext
(WST), VPS, WSS. The data is acquired and decoded by the teletext decoder (TPU), then stored in an SRAM lnterface.
4-1-9- Data Capture Features
Video Signal Quality detector
Data Capture for 625 line WST
Data Capture for VPS data (PDC system A)
Data Capture for Wide Screen Signalling (WSS) bit decoding
Real-time capture and decoding for WST Teletext in Hardware, to enable optimised microprocessor throughput
10 page memory stored On-Chip
Service manual SC-140
-21-
IC marking
English, French,
German, Italian,
Spanish, Dutch,
Danish, Finnish,
Norwegian, Swedish,
Greek, Polish,
Hungarian, Czech,
Slovakian, Romanian,
Russian.
• Inventory of transmitted Teletext pages stored in the Page Table
Signal quality detector for WST data
Comprehensive Teletext language coverage
Full Field Vertical Blanking Interval (VBI) data capture of WST data
4-1-10- TV processor version and -Controller capacity
IC version VCT 3832A VCT 3834A
8 bit
-controller
ROM size 96k 96k
RAM size 1k 1k
PAL decoder
SECAM decoder
NTSC decoder
Picture improvement
Teletext page memory 10 pages 10 pages
Adaptive Comb filter
Panorama Scaler
4-1-11- IC marking and version
Chassis OSD languages
ATSS countries
Text
SC-140 VCT3834A
Pan-European Latin.
Cyrillic, Greek.
GB, France, Germany,
Italy, Belgium, Spain,
Austria, Poland,
Switzerland, Denmark,
Finland, Netherlands,
Norway, Sweden,
Ireland, Hungary,
Czech Republic, Others
4-1-12- Pinning
PSDIP
64-pin
1 Power OUT High = SMPS ON, Low = SMPS in stand by mode.
2 AGC IN For service only, tuner AGC, TOP alignment.
3 VSUPP1 SUPPLY Supply Voltage, Port ( pin 1, 2, 5, 6, 7, 8, 9, 10, 61, 62, 63, 64).
4 GNDP1 SUPPLY Ground, Port.
5 MOD_SW O UT High = Negative modulation, Low = Positive modulation (L/L’).
6 SECAM L/L’ OUT High = L’, L ow = L.
7 AFC IN
8 IR IN
9 SC1.SW IN
10 SC2.SW IN
11 VOUT OUT Analog Video Output
12 VRT IN Reference Voltage Top, Video ADC
13 SGND IN Signal Ground for Analog Input
Pin Name
Type
Short Description
X
Service manual SC-140
-22-
14 GNDAF SUPPLY Ground, Analog Front-end
15 VSUPAF SUPPLY Supply Voltage, Analog Front-end
16 CBIN IN Analog Component Cb Input
17 CIN1 IN Analog Chroma 1 Input
18 CIN2/CRIN IN Analog Chroma 2 Input / Analog Component Cr Input
19 VIN1 IN Analog Video 1 Input
20 VIN2 IN Analog Video 2 Input
21 VIN3 IN Analog Video 3 Input
22 VIN4 IN Analog Video 4 Input
23 TEST IN Test Pin, Reserved For Test
24 HOUT OUT Horizontal Drive Output
25 VSUPD SUPPLY Supply Voltage, Digital Circuitry
26 GNDD SUPPLY Ground, Digital Circuitry
27 FBLIN IN Fast Blank Input
28 RIN IN Analog Red Input
29 GIN IN Analog Green Input
30 BIN IN Analog Blue Input
31 VPROT IN Vertical Protection Input
32 SAFETY IN Safety Input
33 HFLB IN Horizontal Flyback Input
34 VERTQ/ INTLC OUT Differential Vertical Sawtooth Output Interlace Control Output
35 VERT OUT Differential Vertical Sawtooth Output
36 EW OUT Vertical Parabola Output
37 SENSE IN Sense ADC Input
38 GNDM SUPPLY Ground, MADC Input
39 RSW1 OUT Range Switch1 for Measurement ADC
40 RSW2 OUT Range Switch2 for Measurement ADC
41 SVMOUT OUT Scan Velocity Modulation Output
42 ROUT OUT Analog Red Output
43 GOUT OUT Analog Green Output
44 BOUT OUT Analog Blue Output
45 VSUPAB SUPPLY Supply Voltage, Analog Back-end
46 GNDAB SUPPL Y Ground, Analog Back-end
47 VRD IN DAC Reference
48 XREF IN Reference Input for RGB DACs
49 AIN3 IN Analog Audio 3 Input
50 AIN2 IN Analog Audio 2 Input
51 AIN1 IN Analog Audio 1 Input
52 AOUT2 OUT Analog Audio 2 Output
53 AOUT1 OUT Analog Audio 1 Output
54 VSUPS SUPPLY Supply Voltage, Standby
55 GNDS SUPPLY Ground, Standby
56 XTAL1 IN Analog Crystal Input
57 XTAL2 OUT Analog Crystal Output
58 RESQ IN/OUT Reset Input/Output, Active Low
59 SCL IN/OUT I 2 C Bus Clock
60 SDA IN/OUT I 2 C Bus Data
61 Mute OUT High = Mute active
62 LED OUT High = Green, Low = Red
63 KB IN Local keyboard ADC input
64 OCP IN Over Current Protection input
Pin Name
Type
Short Description
PSDIP
64-pin
Service manual SC-140
-23-
OCP64
63
62
61
60
58
57
56
55
48
46
45
44
43
42
41
40
39
38
37
36
34
35
33
47
54
53
52
51
50
49
59
KB
LED
MUTE
SDA
SCL
RESET
XTAL in
OSC GND
GND
S/B 3.3V
GND
GND
GND
XREF
VRD
GND
5V
B out
G out
R out
SVM out
RSW2
RSW1
GND
SENSE
EW
VERTQ
VERT
HFLB
Power1
2
3
4
5
7
8
9
10
17
19
20
21
22
23
24
25
26
27
28
29
31
30
32
18
11
12
13
14
15
16
6
AGC
S/B 5V
Gnd
MOD SW
SECAM L
AFC/RES
IR
SC1 SW
SC2 SW
Vout
VRT
SGND
GND
5V
Cb in
C in
Cr in
IF-IN
SC1-IN
SC2-IN
RCA VIN
TEST
H out
3.3 V
GND
FBLIN
Rin
Gin
Bin
VPROT
SAFETY
VCT 383X
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