Sanyo CE28D6-C Schematic

Part No. SKSM0481 C2WEV JUNE 2001
Colour Tele vision Ser vice Manual
Model CE28D6-C
Service Ref. No. CE28D6-C-00
PRODUCT CODE: 111351304 ORIGINAL VERSION: Chassis No. EB6-B
Note This TV receiver will not work properly in foreign countries where the television transmission system and power source differ from the design specifications. Refe r t o the specifications for the design specifications
CE28D6-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
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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 par ts 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 primar y 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 B/G, D/K Colour system PAL/NTSC4.43 (PAL/NTSC4.43/MTSC3.58 IN AV MODE) Receiving channel UHF: 21~69
VHF: E2-E12, R1-R12 CATV: X, Y, Z, Z+1, Z+2, S1-S41
Aerial input impedance 75ohm
AV terminal 21 Pin SCART Ter minal AV1:CENELEC standard with RGB
AV2:CENELEC standard with S-inputs Front AV AV3:RCATerminal, Video and Audio (L/R) Sound output(Music) 12W x 2 Dimensions (WxHxD) 736 x 597 x 494mm Weight 32 Kg
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BLOCK DIAGRAM
This is a diagram for all models and therefore differs slightly from the actual block diagram.
Outline
FOCUS
SCREEN
V
AV1
AV2
FBT
T451
D.Y
H
Q701
Q711
R
Q721
R
VIDEO-OUT
Q242
20
CRT
B
G
G
Q243
21
VIF
X132
B
6
Q244
22
7
IC201
X131
TV-OUT
Q121~Q133
54
9
SIF
SC-1
8
13
SIF-IN
TV-IN
3
DEF
IF/VIDEO/
CHROMA/
34
35
C BUS
2
I
MONTO
SC-2
15
18
Y-OUT
C-OUT
Y
C
SYNC-IN
43
394041
1516171826
B
R
G
BLK
-OUT
Refer also
EW-OUT
to FIG.-2.
AV SELECTOR
NICAM DECODER
H-OUT
32
Q432
T431
Q431
PCC
CONTROL
CS
CONTROL
3
6
V-OUT IC501
Aerial
A101
TUNER
Q141
POWER
PC-IN
CPU
24
23
SDA
IC803
MEMORY
CVBS-IN
61
60
PROTECT-IN
1 - 15
19
80 - 63
ROM
IC802
B
R
G
BLK
26
25
44
45
46
47
IC801
SCL
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AV Selector NICAM DECODER
System Control
Fig.-2
Fig.-3
FRONT-AV
SC-1
SC-2
IC201 IF/VIDEO/ CHROMA
IC001
AUDIO-OUT
I2C BUS
K12H
FRONT AV3
MONITOR-OUT
SC-1
(VIDEO/AUDIO-L/R)
SC-2
(VIDEO/Y/C/AUDIO-L/R)
K12J
(VIDEO)
C-OUT
Y-OUT SIF-IN
AUDIO L/R-OUT
IC1201
AV-SELECTOR
<MM1313>
1(V)
2(L) 4(R)
13(V) 14(L)
16(R)
7(V) 8(L)
9(Y) 10(R) 11(C)
41(V)
SDA/SCL
(V)34
MONITOR-OUT
31
29
33 32
Y-OUT
37
C-OUT
38
Y-IN
C-IN
L-OUT
R-OUT
Q1204/1207
Q1205
Q1202
AUDIO-OUT
Q1203
IC3451 NICAM
37 36
STEREO
<TDA9875>
12
60 61
4 5
&
I2C BUS
CONTROL
IC803
MEMORY
RC-IN
SDA
POWER-FAIL
DETECT
SCL
POWER
25 26 28
24
23
19
1 - 7, 63 - 80
KEY-IN
IC801
CPU
MUTE
40
44 45
46 47
60 61
Q806
BLK-OUT B-OUT G-OUT R-OUT
CVBS
IC802
ROM
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Deflection Control
IC501
V-Output<LA7846>
IC201
IF/VIDEO/
DEFLECTION
<TB1251>
41
EW-Out
63
Deflection
Yoke
26
32
V-Drive
Q431
H-Drive
Q431
H-Output
T431
Drive T r ans
Vert.
Coil
Horiz.
Coil
T451
FlyBack Trans
L461/L462
CS SW
D441
Screen Width Control
Q462
Q461
Pcc Control
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CABINET DISASSEMBLY
CABINET BACK DISASSEMBLY
1. Remove 7 screws(A).
2. Pull out the cabinet back.
(A)
(A)
(A)
(A)
(A)
(A)
(A)
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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 performed 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 Pbutton on the front panel of the TV.The option win-
dow will appear on the screen. Set the options as shown below.
To set the option mode
+ Highlight the desired option item by using the Por Pbutton . + 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 TUNE/SORT”
or AUTO TUNE
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 “ON” 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 UK or IRELAND Destination option , default “UK” 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
OPTION
ON-TIMER ON SORT MODE PLUG & PLAY WELCOME TEXT CODE TEST WSS WIDE OPTION 312/313 Mode AV3 OPTION 3D SURROUND SIF OPTION
ADJUST : EXIT : RECALL
ATS EURO PLUS
ON ON OFF
ON OFF
ALL LANGUAGE
OFF
ON
ON
BG ONLY
?
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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 performed “OPTION SETTING” on previous page and the following adjustments, refer to further adjustment on page 14.
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 Pbutton inside of the door.The
adjustment window will appear on the screen.
IMPORTANT NOTICE
Do not attempt to adjust service adjustments not listed on the above otherwise it may cause loss of performance and product safety.
Item No. OSD Description
1 P V-P Ver tical Centre Adjustment 2 P H-P Horizontal Centre Adjustment 5 P V-S Ver tical 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-Dr ive Adjustment 4 GRY B-Dr ive Adjustment 7 HBP H-Blanking Phase 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.
ADJUST
REGULAR WIDE OTHERS TB1251
SELECT: EXIT : RECALL
OK
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To select the mode and service item and change data value
+ Highlight the desired adjustment mode by using the Por Pbutton and then press the F/OK button. + To select the adjustment item, use the Por 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 te remote control and then press the Pbutton 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 necessar y to set the option settings and readjust the service adjustments listed on left page.
REGULAR mode
WIDE mode
REGULAR 1, AGC 38
Adjustment No. and Item name
Adjustment Data
Adjustment No. and Item name
WIDE
1. P V-P 1F
Adjustment Data
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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 nor mal.
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 UHF to the clear­est station.
2. Connect digital voltmetre to test point TP-A and GND.
4. Enter to the ser vice mode and select mode “REGU-
LAR”, and select item no.1 “REGULAR 1, AGC”.
5. Press the LEVEL+ or LEVEL - button to adjust voltage
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 ser vice 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 ser vice 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 ser vice 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
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