Sanyo CE25DN7-C User manual

Part No. SKSM0538 C2VYS MARCH 2002
Colour Television
Service Manual
Model CE25DN7-C
Service Ref. No. CE25DN7-C-00
PRODUCT CODE: 111351218
ORIGINAL VERSION: Chassis No. EB6-B
Give complete "SERVICE REF. NO." for parts
order or servicing, it is shown on the rating sheet
on the cabinet back of the TV set.
Note
This TV receiver will not work properly in foreign
countries where the television transmission
system and power source differ from the design
specifications. Refer to the specifications for the
design specifications
CE25DN7-C
Contents
Safety precautions/Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3~5
Cabinet Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Adjustment and Repair Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7~11
CPU Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12~13
Component Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14~15
IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16~20
Pin description of semiconductors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Part Description and reading of schematic diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Cabinet Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electric Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24~31
Please use Schematic Diagram SKP20357 with
this service manual.

-2-
C2VYS
SAFETY PRECAUTION
X-RADIATION PRECAUTION
The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially
constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube
must be the same type as the original including suffix letter. Excessive high voltage may produce potentially
hazardous X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit.
Refer to this service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds
specified limits, take necessary corrective action. Carefully follow the instructions for +B1 volt power supply
adjustment, and high voltage adjustment to maintain the high voltage within the specified limits.
PRODUCT SAFETY NOTICE
SPECIFICATIONS
Product safety should be considered when a component replacement is made in any area of a receiver.
Components indicated by mark in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is particularly recommended that only parts designated on the parts list in
this manual be used for component replacement designated by mark . No deviations from resistance wattage
or voltage ratings may be made for replacement items designated by mark .
!
!
!
1: An isolation transformer should be connected in the
power line between the receiver and the AC line
when a service is performed on the primary of the
converter transformer of the set.
2: Comply with all caution and safety-related notes
provided on the cabinet back, inside the cabinet, on
the chassis or the picture tube.
3: When replacing a chassis in the cabinet, always be
certain that all the protective devices are installed
properly, such as, control knobs, adjustment covers
or shields, barriers, isolation resistor-capacitor networks
etc. Before returning any television to the customer,
the service technician must be sure that it is completely
safe to operate without danger of electrical shock.
Power source AC 220~240V, 50Hz
Television system System BG, D/K
Colour system PAL/NTSC4.43 (PAL/NTSC4.43/MTSC3.58 IN AV MODE)
Receiving channel UHF: #21~69
VHF: E2-E12
CATV: X, Y, Z, S1-S41
Aerial input impedance 75ohm
AV terminal
21 Pin SCART Terminal AV1:CENELEC standard with RGB
AV2:CENELEC standard with S-inputs
Front AV AV3:RCA Terminal, Video and Audio (L/R)
Sound output(Music) 8W x 2
Dimensions (WxHxD) 794 x 637 x 592mm
Weight 26 Kg

-3- C2VYS
BLOCK DIAGRAM
This is a diagram for all models and therefore differs slightly from the actual block diagram.
IC801
CPU
IC803
MEMORY
SCL
SDA
IC802
ROM
IC201
IF/VIDEO/
CHROMA/
DEF
Q242
Q243
Q244
Q701
Q711
Q721
VIDEO-OUT
CRT
R
G
B
R
G
B
Q121~Q133
TV-OUT
SIF-IN
C-OUT
Y-OUT
13
8
15
18
AV1
AV2
TV-IN SC-1
SC-2
MONTO
-OUT
X132
X131
VIF
SIF
6
7
9
34
35
15
16
17
18
26
T451
FBT
H
V
D.Y
PCC
CONTROL
CS
CONTROL
Q432
Q431
H-OUT
EW-OUT
43
39
40
41
32
3
54
22
21
20
V-OUT IC501
3
6
C
Y
SYNC-IN
BLK
R
G
B
I2C BUS
BLK
B
G
R
CVBS-IN
61
60
47
46
45
44
25 26
24
23
19 1 - 15
80 - 63
T431
PROTECT-IN
PC-IN POWER
Q141
A101
TUNER
Aerial
FOCUS
SCREEN
Refer also
to FIG.-2.
AV SELECTOR
NICAM DECODER
Outline

-4-
C2VYS
FROM KH K12H
AV3 OUT Q1202
AV3-L
SC2 Q1207
AV3-R SC1
KJ K12J Y-OUT
TV IN
Q1203
BA Q3453
SC2 C-IN
SC1 L IN SC1 L IN
SC1 R-IN Q1202
SC1 RIN L-OUT
SC1 L-OUT SC2 RIN Q3452
SC2 R-IN R-OUT Q1206
SC2 L-IN SC2 LIN
SC1 R-OUT MOL
AV3-R IN AV3-L IN
TV/VIDEO IN MOR
Q3454
Y-OUT Q3455
SDA
KM
SCL SIF IN
SIF IN
C-OUT
L-OUT TO IC001
CTRL A FROM IC801
S-SW FROM IC801
R-OUT TO IC001
FROM MAIN K1101
CTRL B FROM IC801
SC1 VIDEO IN
SC2 VIDEO IN
SCART 2 VIDEO OUT
SC2 L-OUT
SC2 R-OUT
AV3 VIDEO IN
IC1202 NJM2233BD
IC3451 TDA9875A/V2
IC1203 HD14052BP
IC1201 LA7952
4
1
8
6
9
6
3
8
12
13
15
11
3
4
5
9
10
7
10
5
14
15
2
11
37
36
51
52
4 5
1
3
5
13
20
18
10
11
8
4
15
6
1
3

5
3 2
K12M
AV Selector
NICAM DECODER
IC801
CPU
25 31 28
24
23
43
61
60
36
46
45
44
1 - 7, 63 - 80
POWER
39
Relay SW
KEY-IN
37
SC1(AV1) 8-pin
SC2(AV2) 8-pin
RC-IN
BLK-OUT
B-OUT
G-OUT
R-OUT
Q806 CVBS
POWER-FAIL
DETECT
SCL
SDA
IC803
MEMORY
I2C BUS
CONTROL
IC802
ROM
System Control
Fig.-2
Fig.-3

-5- C2VYS
IC201
IF/VIDEO/
DEFLECTION
<TB1251>
26
41
32
V-Drive
H-Drive
Q431
IC501
V-Output<LA7833>
63
Q462
Deflection
Yoke
Horiz.
Coil
Vert.
Coil
T451
FlyBack Trans
Pcc Control
Q461
T431
Q431
H-Output
Drive Trans
L461/L462
EW-Out
Deflection Control

-6-
C2VYS
CABINET DISASSEMBLY
CABINET BACK DISASSEMBLY
1. Remove 7 screws(A).
2. Pull out the cabinet back.
(A)
(A)
(A)
(A)
(A)
(A)
(A)

-7- C2VYS
OPTION SETTING
[After replacing the Memory IC (IC803)]
The memory IC, IC803, stores the option data of TV set and service adjustments data for each circuit, therefore,
when the memory IC is replaced, it should be programmed following setting and “SERVICE ADJUSTMENT” on
next page.
To enter to the Option Mode
+ Press and hold the F/OK button on the remote control and P▼button on the front panel of the TV. The option
window will appear on the screen. Set the options as shown below.
To set the option mode
+ Highlight the desired option item by using the P▲or P▼ button .
+ To switch the option mode, use the Volume - (LEFT) or Volume + (RIGHT) button.
+ The data which is set in the option mode is stored into the memory IC automatically.
Following table shows the available option items and default setting mode.
Exit from the Service Mode
+ Press the RECALL button.
Option Mode Mode Description & Note
ON-TIMER ON or OFF On-timer available, default “ON”
SORT MODE AUTO TUNE/SORT Tuning mode, default “AUTO TUNING”
or AUTO TUNING
or ATS EURO PLUS
PLUG & PLAY ON or OFF Plug & Play mode, default “ON”
WELCOME TEXT ON or OFF Display message when first set up, default “OFF”
CODE TEST OFF or ON For factory use, default “OFF”
WSS ON or OFF Wide Screen Signaling available, default “ON”
WIDE ON or OFF Wide mode, default “ON”
OPTION 4 or 7 LANGUAGE Language option , default “4 LANGUAGE”
312/313 Mode ON or OFF Teletext mode, default OFF
AV3 OPTION ON or OFF Front AV disable, default ON
3D SURROUND ON or OFF 3D Surround available, default ON
SIF OPTION BG, I, L/L’ or BG or BG/DK Television default system, Default “BG, I, L/L’”
ON-TIMER ON
SORT MODE
AUTO TUNING
PLUG & PLAY ON
WELCOMETEXT ON
CODETEST OFF
WSS ON
WIDE OFF
OPTION 4LANGUAGE
312/313 Mode ON
AV3 OPTION ON
3D SURROUND ON
SIF OPTION BG + DK
OPTION
ADJUST : EXIT : RECALL
?
OPTION SETTINGS FOR CE25DN7-C-00

-8-
C2VYS
SERVICE ADJUSTMENTS
[After replacing the Memory IC (IC803)]
The memory IC, IC803, stores the service adjustments data for each circuit, therefore, when the memory IC is
replaced, it should be programmed by following “OPTION SETTING” on previous page .
ADJUSTABLE SERVICE ADJUSTMENT
REGULAR
WIDE
To enter to the Service Mode
+ Press and hold the GREEN button on the remote control and then press the P▼button inside the door. The
adjustment window will appear on the screen.
REGULAR
WIDE
OTHERS
TB1251
ADJUST
OK
SELECT:
EXIT : RECALL
IMPORTANT NOTICE
Do not attempt to adjust service adjustments not listed above as it may cause loss of
performance and product safety.
Item No. OSD Description
1 P V-P Vertical Centre Adjustment
2 P H-P Horizontal Centre Adjustment
5 P V-S Vertical Size Adjustment
6 P H-S Horizontal Size Adjustment
7 P PCC Pcc Adjustment
8 P TRP Trapezoid Distortion Adjustment
10 P CNR Corner Adjustment
Item No. OSD Description
1 AGC AGC Adjustment
2 CUT Cut-Off Drive Adjustment
3 GRY G-Drive Adjustment
4 GRY B-Drive Adjustment
8 OSD OSD Positioning Adjustment
Note: Some items of the service adjustments for this chassis are controlled by the CPU, IC801, and the
adjustments are carried out by using the RC handset.

-9- C2VYS
To select the mode and service item and change data value
+ Highlight the desired adjustment mode by using the P▲or P▼button and then press the F/OK button.
+ To select the adjustment item, use the P▲or P▼button.
+ To change the service data, use the Volume -(LEFT) or Volume + (RIGHT) button.
+ The data which is set in the service mode is stored into the memory IC automatically.
Exit from the Service Mode
+ Press the RECALL button or turn off the TV set by using the Mains switch.
INITIALISATION OF MEMORY IC
To initialise the memory IC (IC803), press and hold the NORMAL button on the remote control and then press
the P▲button on the front panel of the TV set, and then turn the Mains switch Off and On. Now the initialisation is
completed.
When initialised the memory IC, all of the setting data (option data and service adjustment data) stored in the IC are
reset to the default value. So it is necessary to set the option settings and readjust the service adjustments listed on
left page.
REGULAR
1, AGC 38
Adjustment No.
and Item name Adjustment Data
WIDE
1. PV-P 1F
Adjustment No.
and Item name Adjustment Data
REGULAR mode WIDE mode

-10-
C2VYS
ADJUSTMENTS
IMPORTANT NOTICE
Do not attempt to adjust the following service adjustments except when adjustments are required in servicing
otherwise it may cause loss of performance and product safety.
1. Receive white raster pattern.
2. Set controls to normal.
3. Connect digital voltmetre to test point TP-B and GND.
4. Adjust voltage to 150 ±0.5V by using VR641.
1. Input and tune an RF signal which is VHF to the clear-
est station.
2. Connect digital voltmetre to test point TP-A and GND.
4. Enter to the service mode and select mode “REGU-
LAR”, and select item no.1 “REGULAR 1, AGC”.
5. Press the LEVEL+ or LEVEL - button to adjust volt-
age to be 3.2Vdc.
By using FOCUS VR, adjust focus control for well
defined scanning lines.
SCREEN ADJUSTMENT
1. Receive black & white pattern.
2. Enter to the service mode and select mode “REGU-
LAR”, and select item no. 2 “REGULAR 2, CUT”. The
horizontal line will appear on the screen.
3. Set the SCREEN VR for one colour to be just visible.
4. Using the numeric buttons shown set each colour to
minimum by decreasing to the point where any further
decrease resets the adjustment to maximum value.
BIAS ADJUSTMENT
5. By using the buttons 1, 2, 4, 5, 7, 8 on the remote
control, adjust the line to be white.
The key allocation is as follows;
Button No. Operation
1 Increase Red
2 Decrease Red
4 Increase Green
5 Decrease Green
7 Increase Blue
8 Decrease Blue
DRIVE ADJUSTMENT
6. Select item no.3 “REGULAR 3, GRY” (G-Drive) or 4
“REGULAR 4, GRY” (B-Drive) and adjust both initially
to 3F.
7. Change data value of each item by using LEVEL + or
LEVEL - button to obtain the proper white balance.
PCC ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item no. 7 “WIDE 7.P PCC”.
3. Press the LEVEL+ or LEVEL - button to adjust the
vertical line to be straight.
TRAPEZOID ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item no. 8 “WIDE 8.P TRP”.
3. Press the LEVEL+ or LEVEL - button to correct the
trapezum distortion of the vertical line.
PCC ADJUSTMENT
GREY SCALE ADJUSTMENT
FOCUS ADJUSTMENT
AGC ADJUSTMENT
+ B VOLTAGE ADJUSTMENT

-11- C2VYS
CORNER ADJUSTMENT
1. Receive cross hatch pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item no. 10 “WIDE 10.P CNR”.
3. Press the LEVEL+ or LEVEL - button to correct the
distortion of the vertical line around the corners.
HORIZONTAL CENTRING ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item no. 2 “WIDE 2.P H-P”.
3. Press the LEVEL+ or LEVEL - button to adjust the
horizontal centre.
HORIZONTAL WIDTH ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item 6 “WIDE 6.P H-W”.
3. Press the LEVEL+ or LEVEL - button to adjust the
horizontal width.
1. Receive circular pattern and set screen mode to
“FULL”.
2. Set controls to normal.
3. Connect high-voltage meter to the anode of CRT and
GND.
4. Confirm that voltage is 29.0±1.0kV at 1.2mA for 25”
model.
VERTICAL CENTRING ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item no. 1 “WIDE 1.P V-P”.
.3 Press the LEVEL+ or LEVEL - button to adjust the
vertical centre.
VERTICAL HEIGHT ADJUSTMENT
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “WIDE”,
and select item no. 5 “WIDE 5.P V-S.
3. Press the LEVEL+ or LEVEL - button to adjust the
vertical height.
1. Receive circular pattern and set screen mode to
“FULL”.
2. Enter to the service mode and select mode “REGU-
LAR”, and select item no. 8 “REGULAR 8 OSD”. The
OSD test bar will appear on the top of screen.
3. Press the LEVEL+ or LEVEL - button to adjust prop-
er OSD positioning.
❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚
OSD POSITIONING ADJUSTMENT
VERTICAL ADJUSTMENT
HIGH-VOLTAGE CONFIRMATION
HORIZONTAL ADJUSTMENT

-12-
C2VYS
CPU PORT FUNCTIONS
Pin No. Function Name Function IN/OUT
1 MMU0 External memory 0 OUT
2 MMU3 External memory 3 OUT
3 ADDR10 Address bus 10 OUT
4 DSN Data Strobe
5 ADDR11 Address bus 11 OUT
6 ADDR9 Address bus 9 OUT
7 ADDR8 Address bus 8 OUT
8 RWN Read Write Strobe
9 GND
10 VDD Power Supply IN
11 OSC-IN Clock Input IN
12 OSC-OUT Clock Output OUT
13 ADDR13 Address bus 13 OUT
14 ADDR14 Address bus 14 OUT
15 MMU1 External memory 1 OUT
16 MMU2 External memory 2 OUT
17 MMU4 External memory 4 OUT
18 MMU5 External memory 5 OUT
19 P3.7/CSO Protect - Power failure detect input IN
20 P3.6/ASN Dolby CLK(L/L’) OUT
21 P3.5 Dolby SO(Super 3D) OUT
22 P3.4 PITTARI switch OUT
23 P5.1 IIC BUS SDA IN/OUT
24 P5.0 IIC BUS SCL OUT
25 P2.0 Remote Control Signal Input IN
26 P2.3 Power Relay & LED Drive On: L OUT
27 P2.4 SUB CPU SO OUT
28 P0.2 Key switch input IN
29 P0.1 SUB CPU CLK OUT
30 P0.0 SUB CPU SI IN
31 P4.7 THRESHOLD switch OUT
32 P4.6 JIMAKU(Caption) switch OUT
33 P4.5 On-Timer LED Drive ON: L OUT
34 VDD IN
35 GND
36 P2.1 AV1 Scart function input IN
37 P2.2 AV2 Scart function input IN
38 P2.5 RF AGC input IN
39 P4.4 H-Blank On/Off OUT
40 P4.3 AMP Mute Mute On: H OUT
41 P4.2 Dolby RQ OUT
42 P4.1 H-Blank Phase OUT
43 P4.0 50/60Hz output 50Hz: H OUT
44 FB BLK Output for OSD (Active H) OUT
45 B Blue Output for OSD (Active H) OUT
46 G Green Output for OSD (Active H) OUT
47 R Red Output for OSD (Active H) OUT
48 V-SYNC V-Sync Input (Active H) IN
49 H-SYNC H-Sync Input (Active H) IN
50 WSCR VPS/WSS Slicer Line PLL

-13- C2VYS
Pin No. Function Name Function IN/OUT
51 WSCF VPS/WSS Slicer Line PLL
52 VDD-A Analogue Power Supply IN
53 PXFM Pixel Frequency Multiplier
54 RESET Reset Input (Active L) IN
55 MCFM Pixel Frequency Multiplier
56 JTRSTO
57 TXCF
58 CVBS0
59 TEST0
60 CVBS1 Video signal Input IN
61 CVBS2 Video Signal Input IN
62 GND-A
63 DAT3 Data bus 3 IN
64 DAT4 Data bus 4 IN
65 DAT5 Data bus 5 IN
66 DAT6 Data bus 6 IN
67 DAT7 Data bus 7 IN
68 DAT2 Data bus 2 IN
69 DAT1 Data bus 1 IN
70 DAT0 Data bus 0 IN
71 ADDR0 Address bus 0 OUT
72 ADDR1 Address bus 1 OUT
73 ADDR2 Address bus 2 OUT
74 ADDR3 Address bus 3 OUT
75 ADDR4 Address bus 4 OUT
76 ADDR5 Address bus 5 OUT
77 ADDR6 Address bus 6 OUT
78 ADDR7 Address bus 7 OUT
79 ADDR12 Address bus 12 OUT
80 ADDR15 Address bus 15 OUT

-14-
C2VYS
COMPONENT LOCATIONS
Q613
Q461
T451
TP-B
T611
T681
Q432
K1002
IC501H3
IC501
IC501H2
VR641
KX
KJ
K1001
KM
IC201
KMB
KMA
IC802
IC001
T131
TP-A
A101
UNDERSIDE OF BOARD
IC801
MAIN BOARD

-15- C2VYS
K7P
K7Q
K7D1
C735
Q701
CRT BOARD

-16-
C2VYS
IC BLOCK DIAGRAMS
IC001 TDA7263M <Audio Output>
GND
6
4
58OUT R
OUT L
RF1
RF2
RF3
RF4
RF1 27K
CF COUPL
IN -R
IN +R
SUPPLY
VOLTAGE TURN-ON
AND-OFF
MUTE
REFERENCES
IN +L
IN -L L
Tj
TH
PROTECTION
SC
PROTECTION
RF1 27K
CF COUPL
9
3
1-
+
2
R
-
+
10
TDA7263M
IC501 LA7833N <Vertical Output>
GND
VERTICAL
DRIVE VERTICAL
OUTPUT V-OUTPUT
VCC
6
4
3
15 LA7833
THERMAL
PROTECTION
PUMP UP
7
2
V-DRIVE PLS
INPUT

-17- C2VYS
IC201 TB1251AN <IF/Video/Chroma/Def.>
56 505152535455 49 434445464748 42 363738394041 35 293031323334
1 765432 8 1413121110915 212019181716 22 282726252423
SDA
SCL
Sync in
I2C Bus
IF
Cutoff/Drive
<R.G.B.CUTTOFF>
<R.G.B.DRIVE>
Matrix / SW
RGB Interface
Bright <RGB BRT>
Uni-Color<RGB CONT>
Mode SW
EW PROC.
<H.SIZE>
<EW PARA.>
<TRAPEZIUM>
<EW CONER>
EHT H/V
<EHT.H> <EHT.V>
Y IN
V PROC.
<V.SIZE>
<V.LINEAR.> <V-S CORR.>
<V.SHIFT>
FM DEMOD.
Gain Sw
L SECAM AM
AUDIO ATT
<ATT>
Chroma DEMOD.
PAL/NTSC/SECAM
1H delay line
1 X'tal
<TINT>
<color system>
<F ID>
<Killer Sence>
EW OUT
Y Proc.
Clamp C-TRAP <c-trap> Black Stretch <B.S.> DC restore <DC rest> Y-γ<γ>
Y-D.L. <DL> A.C. <P.SHARP> Sub-Cont <S.CONT> Uni-Color <CONT> Bright <BRT> WPS Half T. <H.T> <ABL START P> <ABL GAIN>
PIF Proc.
L-SECAM
DEF Proc.
H,V synchronization
<Lock det.>
<Sync det>
<AFC1 Gain>
Chroma Baseband Proc.
<Color>
<Unicolor>
Clamp
BBTINT
IF IN
SAW
IF GND
AFT OUT Ripple F
IF AGC
+
APC Filter
+
4.43MHz X'tal
CW OUT
Ys/Ym
EXT.R IN
EXT.G IN
EXT.B IN
RGBVcc(9V)
+
R OUT
G OUT
B OUT
V BIAS
FILTER
V NFB
V OUT
DC NF
+
SIF OUT
VSM OUT
C in
BLACK Det
+
Cb in
DC Restor
ABCL IN
YCVcc(5V)
+
Dig GND
YC GND
H OUT
HVcc(9V)
FBP IN/SCP OUT
DE-EMP.
Dig.VDD
+
+
EHT in
IF DET OUT
Hcorr IN/SIF IN
PIF tank
6.5MHz
BPF TRAP AVSW
LOOP Filter
+
IFVcc(5V)
+
AUDIO OUT
V RAMP
1'st SIF IN
ref R
Split SIF Processor
6.5MHz
Uni-SIF beet up
RF AGC
+
SAW
H.AFC
+
Cr in
PIFVCO
BIAS Filter
BIAS BIAS

-18-
C2VYS
IC3451 TDA9875A <NICAM & Stereo Sound Decoder>
SUPPLY
SOUND IF
(SIF)
ANALOG
SCROSSBAR
SWITCH
NICAM
DECODER
DEMATRIXCLOCK
PEAK
DETECTION LEVEL
ADJUST LEVEL
ADJUST
ADC(2)
DAC(2)
SUPPLY
DAC
SUPPLU DAC
REFERENCE
SUPPLY
OPERATIONAL
AMPLIFIERS
AUDIO PROCESSING
DAC(2)
DAC(2)
TEST
TDA9875
DIGITAL SUPPLY
DIGITAL
SELECT
I2C BUS
AUDIO
INTERFACE
TIMING
DETECT DAC
NICAM
DEMODULA-
TION
FM(AM)
DEMODULA-
TION
IDENTIFICA-
TION
I2C BUS
INTERFACE INPUT SWITCH
AGC, ADC
SIF1
SIF2
12
10
9
20
3
13
4 5 18
17
21
27
SDI1 SDI2
SDO1 SDO2
SCK
WS
VDDD1
VDDD2
VSSD1 VSSD2
CREST
TEST1 TEST2
SYSCLK
XRALO
XTALI
SDA
SCL
ADDR2 ADDR1
P2 P1
26 25 24 22 23 15 64 14 49 16
28
30

57
58
60
61 MOL
MOR
AUXOL
AUXOR
CREST CREST
CREST
Vref(n) Vref(n) Vref2 VSSG VSSA2 VDDA2 PCAPL PCAPR CAPR2 CAPR1 CAPL1 CAPL2
LOL LOR SCOL2 SCOR2 SCOL1 SCOR1 MOMOIN EXTIL EXTIR SCIL2 SCIR2 SCIL1 SCIR1 PCLK NICAM Iref Vref1 VSSA1 VDDA1 Vtune
50 53
59
CREST
56
40 39 46 35 43 38 55 54 44 45
41 42 62 63 52 51 48 47 29 32 31 37 36 34 33
1 2 8
11
6 7
19

-19- C2VYS
C2VZS
PIN DESCRIPTION OF SEMICONDUCTORS
A
K
C
BE
C2
C1
B1 B2
E
C
CBE
KA
C
B
E
B2
B1
C1 C2
E
E
B
C
B2
B1
C1 C2
E
B2
B1 C1
C2
E1
E2
K
AA
A
KK
K
A
K
A
C
BECBEC
B
E
1
2
3
4
5
6
Index
12N
Index Index
12N
2
13
(IN) (OUT)
(GND)
21 4
2
1
3
Index
1
N
Index 1
N
Index 1
N
Index 1
N
Index 1
N
Index
1N
2
131
232
1
3
RESET GND
Vdd
5
3
D
GSD
G
S
K: Cathode
A: Anode
C: Collector
B: Base
E: Emitter
D: Drain
G: Gate
S: Source
●Diode
●Transistor/FET
●IC
E1
C2
E2 C1
B2
B1
Index
●Diode
●Transistor/FET
●IC
FET

-20-
C2VYS
PARTS DESCRIPTION AND READING IN SCHEMATIC DIAGRAM
1. The parts specification of resistors, capacitors and
coils are expressed in designated code. Please
check the parts description by the following code
table.
2. Some of transistors and diodes are indicated in
mark for the substitution of parts name. Please
check the parts name by the following code table.
3. Voltages and waveforms were taken with a video
colour bar signal(1Vp-p at 75 ohms terminated) and
controls to normal.
4. Voltages were taken with a high-impedance digital
voltmetre.
Example 2000 K K 1000 BG
Characteristic
Example 160 E M 10
Capacitance value
Tolerance
Type
Rated voltage
Excepting electric capacitors, all
capacitance values of less than 1
are expressed in µF and more
than 1 are in pF.
Example L2 C1 4R7 K N
Tolerance
Inductance value
Manufacture code
Unique code
Mark Material
E Electrolytic
P Electrolytic (non-Polarised)
C Ceramic (temperature compensation)
K Ceramic
F Polyester
N Polypropylene
M Metalised polypropylene
H Metalised polypromylar
B Ceramic (semiconductor)
G Metalised polyester
Y Composite film
S Styrol
T Tantalum oxide solid electrolytic
U Organic semiconductive electrolyte
D Electric double layer electrolytic
Mark Tolerance
A not specified
B ±0.1
C ±0.25
D ±0.5
F±1
G±2
E ±2.5
H±3
J±5
K±0
M±20
N±30
P +100 -0
Q +30 -10
T +50 -10
U +75 -10
V +20 -10
W +100 -10
X +40 -20
Y +150 -10
Z +80 -20
Mark Tolerance (nH) Mark Tolerance (%)
C ±0.25 G ±2
D ±0.5 J ±5
S ±0.3 K ±10
A ±0.2 L ±15
M±20
Coil Reading
Capacitor Reading
Example 1/2 D J 10K B
Example 6 W K 8.2
Example 1/2 C K 1M
Resistor Reading
Characteristic
Z (Carbon fuse)
B (Non-burnable)
Resistance value
Tolerance (see below table)
Material (see below table)
Rated wattage (W)
K indicates in KΩ
M indicate in MΩ
Note: Resistor which is indicated with resistance value only are
1/6W carbon resistor. Resistor which is indicated with materi-
al, tolerance and value are 1/4W rated wattage.
Mark Material
D Carbon
N Metal film
S Oxide metal film
C Solid
G Metal glaze
W Wire wounding or cement
H Ceramic
F Fusible
Mark Tolerance
A ±0.05
B ±0.1
C ±0.25
D ±0.5
F±1
G±2
J±5
K±10
M±20
P +5 -15
Z used in 0 ohm
●Material table ●Tolerance table
●Material table ●Tolerance table
Mark Type number
-- 1S1555,1S2473,1S2076,1SS133,DS442,1SS176
K 1S1555,1S2473,1S2076,DS442
L 1S1555,1S2076A,1S2471
M 1SS133,1SS176,GMA01
N 1S1555,1S2473,1S2076,1SS133,DS442,1SS176,1N4148
P 1S1555,1S2076A,1S2471,1N4148
R 1S1555,1S2076,1S2473,DS442,1N4148
AA 1S1555,1S2076,1S2473,1SS133,DS442,1SS176,1N4148,GMA01
●Diode
Mark Type number
-- 2SC536 2SC945A 2SC1815 2SC1740 2SC1740S KSC945C
A E, F, G P, Q, R O, Y, G Q, R, S Q, R, S
B E, F, G P, Q, R O, Y, G Q, R, S
D F, G P, Q Y, G Q, R, S
F F, G P G R, S
H F, G P, Q Y, G Q, R, S Y, G
I E, F, G P, Q, R O, Y, G Q, R, S Y, G
G F, G P G R, S G
AD F, G Q, R Y, GR Q, R, S
AE E, F, G Q, R O, Y, GR Q, R, S
●Transistor (NPN type)
Mark Type number
-- 2SA608 2SA564A 2SA1015 2SA933 2SA933S KSA733C
Y E, F Q, R O, Y, G Q, R
WF R Y,GR
V E, F Q, R O, Y, G Q, R Y, G
U F R Y, G R G
Z E, F Q, R O, Y, G Q, R Q, R
AB F R Y Q, R
AE E, F Q, R O, Y R
●Transistor (PNP type)
Diode/Transistor Type Reading