Sanyo C28W1 User manual

Part No. SKSM0216 F2HT/HV SEPTEMBER 1997
Colour Television Service Manual Model C28W1(Europe)
C28WN1(Europe)
Service Ref. No. C28W1-00
Service Ref. No. C28WN1-00
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
PRODUCT CODE
1113 29315 (C28W1)
1113 29316 (C28WN1)
ORIGINAL VERSION
Chassis No. WB2-B
Contents
Safety notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Pin configuration of system control, CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Chassis block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
IC block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-12
Adjustment locations on the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-15
Service control adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Circuit alignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Adjustments in the service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-20
Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Cabinet parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Electrical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23-37

-2- F2HT
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
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.
Specifications (C28W1/C28WN1)
Power source AC 220~240V 50Hz
Television system System B/G)
Colour system PAL
Receiving channel VHF E2~E12
UHF 21~69
CATV S1~S41, X,Y,Z, Z+1, Z+2
Common Specifications
Aerial input impedance 75ohm
AV terminal
21 Pin socket AV1 CENELEC standard<RGB/,S-in>
AV2 CENELEC standard
Front AV terminal AV3 RCA type,Video,Audio-L/R input
Sound output Main 10 watts X2
Picture tube 70cm diagonal, 106 degree
(Visible picture diagonal) 66cm
Dimensions (WxHxD) 739 x 494 x 485 mm
Weight 38.5 Kg
SPECIFICATIONS
SAFETY NOTICE

-3-
F2HT
PIN CONFIGURATION OF SYSTEM CONTROL, CPU
1
2
4
5
8
9
10
11
13
14
15
16
17
19
20
21
22
23
25
26
30
31
60
63
62
61
60
59
57
56
55
53
52
46
45
44
43
42
41
36
34
33
I DENT
CHROMA ID
KEY IN
RC SIGNAL
COLOUR
BRIGHTNESS
CONTRAST
SHARPNESS
SCLK
DATA
I2C BUS SW.
SYNC ID
PAL/NTSC
THRESH HOLD
SQ
CLK
SI
AFT
I2C SCL
I2C SDA
OSC
OSC
Vcc +5V
H-SYNC
V-SYNC
OSD RED
OSD GREEN
OSD BLUE
OSD BLANKING
POWER ON/OFF
LED DRIVE
AV1 SW
AV2 SW
SOUND MUTE
LINE MUTE
SC1 FUNCTION
SC2 FUNCTION
POWER FAILURE DET.
IGNORE
TITLE IN
PITTARI
NORMAL
IC801
M37207MB-
TO SUB VIDEO
BOARD
TO Y/C SEPARATION
BOARD
D/A CONVERTER CIRCUITS
IDENT 4
COLOUR 26
BRIGHT 17
CONTRAST 25
SHARPNESS 14
AFT 44
IC101
TDA8361
FBP
SANDCASTLE PLS
TO
Q203,
Q204,
Q205
TO IC201-
PIN21
TO IC1001
PINS 6, 12
FROM
SCART1, 2
TO
DEFLECTION
BOARD
SYSTEM CONTROL

-4- F2HT
A101 TUNER PACK
Q101 X101
SAW
IC101
TDA8361
<IF/VIDEO/CHROMA>
IC270
TDA4661
<1H DELAY>
Q122 SIF TRAP
Q135 Q132 Q134
EQUALISER
AV1
AV2
AV3 VIDEO-IN
VIDEO-IN
VIDEO-IN
R/G/B/BLK-IN
IC1001 TA8747N <AV SELECTOR>
AV1
AV2
FROM CPU
BACK BOARD
TELETEXT BOARD
CRT BOARD
TV-IN
MONITOR-OUT
Y-OUT
C-OUT
R/G/B/BLK-OUT
R/G/B-IN
Y-IN
C-IN
BLK-IN
VIDEO-IN(INTERNAL)
VIDEO-OUT
R/G/B-OUT
R/G/B/BLK FOR OSD FROM CPU
Q203 Q204 Q205
R/G/B BUFFER
R/G/B
R-Y/B-Y-OUT
R-Y/B-Y-IN
CRT
Q2761 Q2772 Q2782
VIDEO-OUT
45 46
30 31 28 29
16 14 11 12 22
23 24 16
15
7
13
21
20 19 18
1
35 28 33
31
25
2313
7
1
6
12
VIDEO-IN
BLOCK DIAGRAM <VIDEO SIGNAL PROCESSING>
CHASSIS BLOCK DIAGRAMS

-5-
F2HT
A101 TUNER PACK
Q101
IC3801
SIF
<TDA2545A>
IC3811
A2 STEREO
<TDA9821>
IC101 IF/VIDEO/CHROMA <TDA8361>
IC3401
DUAL SOUND
<TDA9840>
IC3451
NICAM
<SAA7283>
IC001 AUDIO OUTPUT FOR FRONT <TA8200AH>
FRONT L SPEAKER
FRONT R SPEAKER
IC1001
AV SELECTOR
<TA8747N>
BLOCK DIAGRAM < AUDIO SIGNAL PROCESSING>
SIF BOARD
BACK BOARD
NICAM BOARDD
1 16 12 1
15
8
7
AF1
AF2
61
7
8
9
14
13
L
R
16
7 29
15
8
L
R
NICAM
MONO.
SIF
MAIN
SUB
AV1
AV2
AV3
TV-L
TV-R
AV1-L
AV2-L
AV3-L
AV1-R
AV2-R
AV3-R
36
2
8
14 34
4
10 16
27 26
L
R
L
R2
4
12
7
HEADPHONES
L
R
16
78
IC3501
3D SURROUND
<MM1369AD>
IC3451
AMP
<M5228FPG>
23
1
L
R
3
5
14
8
L
R
13
11
Monitor-out
TV-out

-6- F2HT
IC101
VIDEO/CHROMA/DEFLECTION
<TDA8361>
Q402
T401
H-DRIVE
Q403
H-OUTPUT
C421
C422
C465
T402
FLYBACK
HIGH
VOLTAGE
L461
Q421
S-C
SW
IC423
PCC
Q461
Q462
ABL
1
C424 C425
C426
C427
DELECTION
YOKE
HORIZ.
VERT.
C512
R512
IC501
V-OUTPUT
<LA7833>
IC521
PCC
<BA4558N>
IC531
V-DRIVE
<TA8859AP>
NORMAL/
PITTARI
MODE SW
FROM CPU
37
42 13
1
10
96
8
2
SCL
SDA
I2C BUS
42
8
7
V-FEEDBACK
V-DRIVE
H-DRIVE
PCC
V-TRIGGER
3
4
BLOCK DIAGRAM <H&V DEFLECTION>
VR371
H-CENTRE
39

-7-
F2HT
IC BLOCK DIAGRAMS
IF AMPLIFIER AGC VERTICAL
OUTPUT PHASE 1
DEMODULATOR AFC AND
SAMPLE AND HOLD VERTICAL
DIVIDER LINE
OSCILLATOR
VIDEO IDENTIFICATION VIDEO
AMPLIFIER POWER
RESET H AND V
SEPARATION
NOISE DETECTOR
PREAMPLIFER MUTE
SWITCH VOLUME
PHASE 2 XTAL
OSCILLATOR HUE
CONTROL
TUNING SYSTEM
MANAGER PHASE
DETECOR
DEMODULATOR
COLOUR KILLERS
COINCIDENCE DETECTOR
ACC AMPLIFIER MATRIX CLAMPS
SET
CLAMP SWITCH
OUTPUT STAGES
LUMINANCE MATRIX
CHROMINANCE BANDPASS
PWL
Y DELAY PEAKING
CHROMINANCE SWITCH
LUMINANCE SWITCH
TRAPAND BYPASS
TUNING
PLL
TEST
LIMITER
SUPPLY
IF IN1
IF IN2
TUNE ADJ
FM DEM1 FM DEM2
AUDEM
EXTAU
SOIF
DEC DIG
GND2 GND3 Vp DEC
FT
CHROMA CVBS
EXT PEAK IN CON
COLOURRGBIN BRI
RO
GO
BO BI
GI RI
FROM TDA4661
TO TDA4661
DET
HUE
XTAL OUT
XTAL2
XTAL1
H OUT
FBI/SCO
PH2LF
H OSC
PH1LF
V RAMP
VFB
V OUT
AFCOUT
DEC AGC
AGC OUT
AU OUT
IDENT
45
46
49
2
3
7
1 6
51
5
8
11 9 10 52 12 16 13 15 14 25 26 21 17
20
19
18
24
23
22
29
28
31 30
33
27
3235
3437
38
39
36
40
42
41434448
4750
4
TDA8361
BYI
BYO BYO
RYI
IFVO
CVBS INT
DEC BG
DECDEM
TDA8361 <IF/VIDEO/CHROMA/DEF.>

-8- F2HT
SIGNAL
CLAMPING LINE
MEMORY SAMPLE-
AND-
HOLD LP
LP
DIVIDER
BY 2
6 MHz
CCO
LP
SAMPLE-
AND-
HOLD
LINE
MEMORY
DIVIDER
BY 192
FREQUENCY
PHASE
DETECTOR
SIGNAL
CLAMPING
SANDCASTLE
DETECTOR
16
14
9
5
10 134,8
12
11
GND1 Vp2 GND2
2
6
13
15
7 i.c.
n.c.
n.c.
n.c.
n.c.
±(B-Y)
±(R-Y)
TDA4661
addition
stages output
buffers
colour-difference
output sugnals
±(R-Y)
±(B-Y)
colour-difference
input signals pre-amplifiers
analogue supply
digital supply
sandcstle
pulse input
Vp1 3MHz shifting clock
TDA4661 <1H DELAY LINE>
AGC
RAMP PULSE
SHAPER TRIGGER PULSE INFERFACE
∫ CORRECT LINEARUTY
CORRECTION S-C CORR.
PALABOLA
CORR. ETH
CORR. ETH
CORR.
16 15 14 13 12 11 10 9
8
7
654
3
2
1
TA8859AP
ETH IN
VERT F/B
GND
EW F/B
Vcc
ETH DRIVE
VERT. DRIVE
SCL
SDA
TRIG IN
TA8859AP <DEFLECTION CORRECTION>
GND
VERTICAL
DRIVE VERTICAL
OUTPUT V-OUTPUT
VCC
6
4
3
15 LA7833
THERMAL
PROTECTION
PUMP UP
7
2
V-DRIVE PLS
INPUT
LA7833 <VERTICAL OUTPUT>

-9-
F2HT
AMP2
12 3456789101112
AMP1
SPEAKER SPEAKER
OUT1
OUT2
AUDIO IN2
AUDIO IN1
RIPPLE FILTER
TA8200AH
GND
GND
VCC
TA8216H/TA8200AH<AUDIO OUTPUT>
CLAMP
DECODER
COMB
FILTER
MUTE MUTE
AUDIO
VIDEO
X2 X2 X2
÷2
MONITOR OUT
Y OUT
Y IN
C IN
C OUT
L OUT
R OUT
SW1
SW2 SW3
MUTE
MODE OUT
GND
RE3
RE4 Vcc
RTV
RE1
RE2
LE2
LE3 LE4
C3
LTV
LE1
C1
C2 Y 3
Y1
Y2 E4
E2
E3 TV
E1
32 16 10 420 34 14 8 2 19 36 17 11 515 9 313 71 21 35
30
28
31
25
23
33
2726
612
18
22
29
24
TA8747N
R IN L IN VIDEO IN
C IN Y IN
TA8747N <AV SELECTOR>

-10- F2HT
7-STAGE
LIMITTER
AMPLIFIER 1
7-STAGE
LIMITTER
AMPLIFIER 2
SUPPLY
VCO1
VCO2
5.5MHz (B/G)
5.74MHz (B/G)
INTERCARRIER
VCOREF
Vp OPTIONAL STEREO
CHANNEL SEPARATION
ADJUSTMENT
VAF2
VAF1
1
15
13 14 12 11 MUTE 10
7
8
9
TDA9821
TDA9821 <DUAL CHANNEL SOUND DEMODULATOR>
DEMODU-
LATOR
DEMO.
17
TDA2546A
REF.
AMP.
AGC
FM
DEMO.
LIMITER
AMP.
1st Sound IF &
Demodulator LIMITER
AMP.
18
1
2
2nd Sound IF
& FM Demo.
314 12 13 11 5
4
6
87
10
9
IF
INPUT
Cd
MUTE
OUTPUT
5.5MHz
(5.742MHz)
38.9MHz
5.5MHz
(5.742MHz)
External
FM demodulator
TDA2545A <SIF DEMODULATOR>

-11-
F2HT
QUADRATURE MIXERS, BASEBAND FILTERS AND AGC GAIN STAGE
COSINE SINE
CARRIER LOOP PHASE DETECTOR AND DATA SLICERS
CARRIER LOOP QUADRATURE VCO
BIT RATE CLOCK RECOVERY
AGC CONTROLLER
NICAM 728 DECODER AND DEVICE CONTROLLER
XTAL OSC
IIC
DAI DIGITAL FILTER, GAIN,
DE-EMPHASIS
NOISE SHAPER (LEFT CHANNEL)
BITSTREAM DAC (LEFT CHANNEL) OUTPUT SWITCHES AND BUFFER (LEFT CHANNEL)
NOISE SHAPER (RIGHT CHANNEL)
BITSTREAM DAC 9RIGHT CHANNEL)
OUTPUT SWITCHES AND BUFFER (RIGHT CHANNEL)
26 24 30 31 36 37 21 20 34 33 35 39 48 43 40 41 42 50 49 51 246
44 12 16 17 34 11 5
15
8
6
7
19
18
1524738
4525
27
3222
23
28
29
MIXREF
DQPSK
VDDF1
VSSF1
COFF
CEYE
VDDF2
VSSF2
REMO
REMVE
IREF
VROF
VRCF
CLKLPF
DATAOUT
DATAIN
XTAL
OSC
VSSX
SDA
SCL
ADSEL
DOBIA
VDDD
VSSD
VSSDAC
EXTL EXTL
VDDA
VSSA
VROA
VRCA
SOFF
SEYE PKDET VCONT VCLK
PCLK
TEST
RESET
PORT2
MUTE
PORM
PORA
EXT-L
EXT-R
OP-R
OP-L
REPRESENTS CONTROLLER BUS
SAA7283ZP
LEVEL AND
STEREO
ADJUSTMENT
DIGITAL
PLL
OSCILLATOR
DIGITAL PLL
AND
DEMODULATOR
DITAL PLL
AND
DEMODULATOR
DIGITAL
INTEGRATOR
DIGITAL
INTEGRATOR
GENERATION
OF
REFERENCE
VOLTAGES
POWER-ON
RESET
IIC BUS
CONTROL
CONTROL
LOGIC
6dB
6dB
6dB
6dB
500mV RMS
500mV RMS
500mV RMS
500mV RMS
MUTE
VREF
LEVEL STEREO
-2dB
0 to 4.5dB
0 to 4.5dB
-2dB
0 to 4.5dB
A/MONO L
R/B
250MV RMS
L/A/MONO
250MV RMS
DUAL bit
STEREO
bit
14
13
12
11
V o1
Vo2
V o3
Vo4
MAIN
SCART
20
1
SCL
SDA
16
18
6
19 GND
XTAL 1/2 Vp
Vp
3
2
4
5
8
7
Vi1
250mV RMS
(from 1st SC)
250mV RMS
(from 2nd SC)
AF1
AF2 Vi2
Vipil
CDCL
CAGC
CLP
15 17 9 10
CD1 CD2 Vi3 Vi4 500mV RMS
TDA9840
SAA7283ZP <NICAM DECODER>
TDA9840 <STEREO/DUAL SOUND PROCESSOR>

-12- F2HT
MODE SELECTOR
stereo/spatial
mono
spatial
stereo/mono
spatial
stereo/mono
stereo/spatial
POWER
SUPPLY
treble L treble R
bass R
bass L
treble
bass
volume balance
IIC BUS
D.GNDSCL
SDA
Vcc GNDVcap
L-IN
R-IN mono
L-OUT
R-OUT
8
14
67
16 15
13
9
10
1211254
1
3
TDA8424
TDA8424 <SOUND CONTROLLER>
SIMULATED
STEREO
SIMULATED
STEREO
VIRTUAL AUDIO
QXPANDER PROCESSOR
gm
24 23 22 21 20 19 18 17 16 15 14 13
1 2 3 4 5 6 7 8 9 10 11 12
Vcc Lin Gl1 Gl2 Gl3 Gl4 Fc Qf1 Qf2 Qf3 Qf4 Lout
Rin Gr1 Gr2 Gr3 Gr4 M/g Ref SPC Qi S/Q Rout Gnd
MM1369AD
MM1369AD <3D SURROUND PROCESSOR>

-13-
F2HT
C013
C009
C006
C002
C003
C012 C010
C003
C050
T121
AFT
C138
X126
X127
X127
1C3431
IC101
IF /VIDEO/COLOUR/
DEF.X101
C375
C371 VR371
H-CENTRE
VR120
AGC
A101 TUNER
TP-A NICAM/STEREO BOARD
K2A
K2B
C103
C101 C102
KIG
C131
C104
SIF BOARD
K8H
K2L K2M
BACK BOARD
SUBVIDEO BOARD
OARD
TP-E
K2E
C218
SW220
SERVICE
SWITCH C205
C275
671
C671
C673
IC802
MEMORY
C810
X801
R014
IC801
CPU
TP-D
C805 C806
KOE
Q134
Q809
Q808
NORMALSERVICE
Q781
Q101 Q180
Q761
Q771
Q762
RED OUT
Q782
BLUE OUT
K7Y
K27EK27V
Q772
GREEN OUT
Q153
Q152
K27B
K761
Q706
K17J K17P
VR782
BLUE BIAS
VR762
RED BIAS
VR772
GREEN BIAS
VR781
BLUE DRIVE
VR761
RED DRIVE
C792
Grey Scale Adjustment
Main Board
CRT Board
SERVICE CONTROL ADJUSTMENTS
1. Receive the clearest station.
2. By using T121, adjust AFT to obtain the best
picture.
NOTE: Do not attempt this adjustment with
weak signal.
1. Receive the clearest station.
2. Set AGC VR(VR120) in direction which causes
snow noise to appear, then in the opposite
direction until snow noise just disappears.
1. Receive circular pattern signal.
2. Adjust H-centre by using VR371.
[SCREEN VR ADJUSTMENT]
1. Receive white pattern signal.
2. Set brightness and contrast controls to
maximum.
3. Set VR761 and VR781 to be mechanical centre.
4. Turn VR762, VR772 and VR782 fully counter-
clockwise.
5. Turn SW220 to “SERVICE” mode.
6. Set screen VR for one colour to be just visible.
[BIAS VR ADJUSTMENT]
7. By using VR762, VR772 or VR782, adjust line to
be white.
8. Turn SW220 to “NORMAL” mode.
[DRIVE VR ADJUSTMENT]
9. By using VR761 and VR781, adjust white
balance.
GREYSCALE ADJUSTMENT
H-CENTRE ADJUSTMENT
AGC ADJUSTMENT
AFT ADJUSTMENT

-14- F2HT
VR1301 TP1310 VR1302
C1324
C1331
C1335
C1301
K20HK20J
IC1302
C1318
IC1303
SUB CPU
X1301
C2512
C2511
TP1311
IC2501
BLACK LEVEL
ADJ.
IC1301
Sub Video Board
T402
FLYBACK
TRANS.
K4A
L704
L425
L461
C491
C402
Q402
T401
HORIZ DRIVE
TRANS.
C481
K4C C486C482
K4S L462
Q461
Q462
C542 C543
Q541
Q542Q531
C531 C546
K4E
C521
L502 C504 C512
Q505 Q501
SW501
V-CENTRE
UP
DOWN
KB4
K6A
IC651
C652
Q614
C651
IC611
C616
C624 C618
Q615
C621
T611
CONVERTER
TRANS.
K6G
Q631
Q616
C633
K6D
L633
Q633
POWER
DRIVE Q634
POWER
SWITCH Q632
IC531
R426
K4H
Q403
HORIZ.
OUTPUT
IC423
Q461 IC501
VERT.
DEF.
C506
SCREENFOCUS
IC481
Power & Deflection Board
1. Receive circular pattern signal.
2. Adjust V-centre by using SW501.
By using FOCUS VR, adjust focus control for well
scanning lines.
[HIGH VOLTAGE ADJUSTMENT]
1. Receive circular pattern signal.
2. Set brightness to centre and contrast to
maximum.
3. Connect a high voltage meter to CRT anode.
4. Confirm high voltage to be 30.5 ±1 KV, and less
than 34.0KV at 0 beam current.
NOTE: This must be done after picture size
adjustment.
1. Receive circular pattern signal.
2. Set screen mode to NORMAL.
3. Adjust right and left blanking width to be equal by
using VR1301(right) and VR1302(left).
H-BLANKING ADJUSTMENT
HIGH VOLTAGE
FOCUS ADJUSTMENT
V-CENTRE ADJUSTMENT
SERVICE CONTROL ADJUSTMENTS

0.01
"A"
P
DC 12.0V
AGC voltage (4.3-4.5V)
Output probe
Input probe
DC5.0V
Marker frequency
Sweep ATT
0dB=176mVrms/75
Tool A
SETTING
K3A-pin5
IC101-pin48
IC101-pin45
(Side b)
IC101-pin7
KOC-pin8
38.9/39.5MHz
20dB
IC101-pin46
and GND
Adjustment
By using T121, adjust "P" to
be maximum amplitude.
Waveform
CIRCUIT ALIGNMENTS
VIF ALIGNMENT
0.002µF
75Ω1kΩ
a
b
10kΩ
Input probe Output probe
SIF ALIGNMENT
DC 12V
AGC voltage
Output probe
Input probe
Sweep ATT
Marker Frequency
SETTING
IC3801-pin11
IC3801-pin3
IC3801-pin1
(Side b)
IC3801-pin12
10dB
38.9/39.5MHz
Adjustment
1. Adjust AGC voltage to be
"A" = 0.5Vp-p.
2. By using T3801, adjust "P"
to be equal centre line.
Waveform
P
Tool A: 0.01uF
Tools
Marker frequency
39.5MHz --> C28WN1B
38.9MHz --> C28W1/WN1
-15-
F2HT
SIF Board
VIF Alignment
C050
T121
AFT
C138
X126
X127
X127
1C3431
IC101
IF /VIDEO/COLOUR/
DEF. X101
C375
C371 VR371
H-CENTRE
VR120
AGC
A101 TUNER
TP-A NICAM/STEREO BOARD
K2A
K2B
C103
C101 C102
KIG
C131
C104
SIF BOARD
K8H
K2L K2M
TP-E
C218
C205
2
75
Q134
Q809
Q808
MAL
SIF Alignment
T3801
IC3801
K38H2 K38H2
X3801
C3807
MAIN Board

-16-
F2HT
CIRCUITALIGNMENTS
Oscilloscope
Input sound signal source
TV system
Deviation
Mode
SETTING
IC3401-pin5
System B/G
27kHz
Stereo
Adjustment
By using T3401, adjust
amplitude to be maximum.
Waveform
PILOT ALIGNMENT
A
Not Required model C28WN1B
1C3431
K34B K34A
TJ3401
X3401
X3461
IC3401
IC3451
C3464
C3462
C3472
C3469
C3467
C3478
L3454 C3408
C3405
C3405
C3409
C3414
C3482
C3484
C3485
C3495C3488
C3486
C3492
C3494
C3433
C3431
C3432
NICAM&Stereo Board
Pilot Alignment
Required only model C28W1/WN1

-17-
F2HT
ADJUSTMENTS IN THE SERVICE MODE
Since some chassis circuit adjustments are controlled by the CPU built into the chassis, adjustments can now be
made by inputting data directly via the remote control handset supplied with the set.
Memory IC replacement
Since adjustment data for the circuit is stored in the memory IC (IC802) that comes with the CPU, the adjustment
data must be re-input when the memory IC is replaced.
(After memory IC replaced, reference data is initially written automatically to memory from the CPU ROM for basic
set operation.)
1. Setting of the service mode.
To enter service mode, press and hold the SERVICE key on the
front control panel, then press the Function button on the
remote control handset.
2. Screen display of the service mode.
●Adjustment items can be selected by pressing the Prog.
up/down button on the remote control handset.
● Adjustment data can be set by pressing Level
up/down button on the remote control handset.
3. To exit from the service mode.
To exit from the service mode, turn off the TV set by
pressing the power on/off button on the TV set or
remote control handset.
1
CS
-/--
0
2 3 4
5678
9
SURROUND
BASS
TV
MENU
iTV
?
XF
AB
P P
VCR
P▲
P▼
TXT
nexTView
ITEM DATA
1.P V-W 37
Adjustment Item Adjustment data
Service Key
Function Button
The adjustments in the service mode are listed below table.
The data in each adjustment item is set with the best setting value in the CPU ROM as initial data.
As the shaded adjustment items are adjusted for each TV set individually, it may slightly differ to the initial data.
When the memory IC is replaced, these adjustments should be readjusted according to service mode adjustments
described next page.
Item Adjustment Screen Mode Initial Data Range of Data Remarks
3.P V-S V-S Correction 50Hz FULL 04 00~31
4.P VSB V-Correction 50Hz FULL 00 00~15
7.P C-P Corner Comp. 50Hz FULL 3 00~15
9.P HCO H-Correction 50Hz FULL 10 00~15
10.P VGM V-∫Correction 50Hz FULL 00 00~15
8.P PHA Keystone Correction 50Hz FULL 30 00~63
6.P PCC Pincushion 50Hz FULL 36 00~63
5.P H-W H-Width 50Hz FULL 26 00~63
2.P V-L V-linearity 50Hz FULL 16 00~31
1.P V-W V-Size 50Hz FULL 35 00~127

-18- F2HT
Item Adjustment Screen Mode Initial Data Range of Data Remarks
11.P H-W H-Width 50Hz NORMAL +26 ±63
12.P PCC Pincushion 50Hz NORMAL 00 ±63
13.P V-W V-Size 50Hz PITTARI +07 ±127
14.P V-S V-S Correction 50Hz PITTARI +06 ±31
15.P H-W H-Width 50Hz PITTARI +16 ±63
16.P PCC Pincushion 50Hz PITTARI +04 ±63
17.P V-W V-Size 50Hz ZOOM +26 ±127
18.P PCC Pincushion 50Hz ZOOM +21 ±63
19.P V-W V-Size 50Hz TITLE IN -12 ±127
20.P PCC Pincushion 50Hz TITLE IN +09 ±63
21.P PHA Keystone Correction 50Hz TITLE IN -30 ±63
22.N V-W V-Size 60Hz FULL 00 ±127
23.N V-L V-linearity 60Hz FULL 00 ±31
24.N V-S V-S Correction 60Hz FULL 00 ±31
25.N VSB V-Correction 60Hz FULL 00 ±15
26.N H-W H-Width 60Hz FULL 00 ±63
27.N PCC Pincushion 60Hz FULL 00 ±63
28.N C-P Corner Comp. 60Hz FULL 00 ±15
29.N PHA Keystone Correction 60Hz FULL 00 ±63
30.N HCO H-Correction 60Hz FULL 00 ±15
31.N VGM V-∫Correction 60Hz FULL 00 ±15
32.N H-W H-Width 60Hz NORMAL 00 ±63
33.N PCC Pincushion 60Hz NORMAL 00 ±63
34.N V-W V-Size 60Hz PITTARI 00 ±127
35.N V-S V-S Correction 60Hz PITTARI 00 ±31
36.N H-W H-Width 60Hz PITTARI 00 ±63
37.N PCC Pincushion 60Hz PITTARI 00 ±63
38.N V-W V-Size 60Hz ZOOM 00 ±127
39.N PCC Pincushion 60Hz ZOOM 00 ±63
40.N V-W V-Size 60Hz TITLE IN 00 ±127
41.N PCC Pincushion 60Hz TITLE IN 00 ±63
42.N PHA Keystone Correction 60Hz TITLE IN 00 ±63
43.WHT Ident.time for Screen mode 15 00~31
44.WHG Tore lance of Ident. screen +03 ±15
45.WHS Threshold level 07 00~15
46.TIL Ident time for Title mode 06 00~31
47.WHR Ident time for unstable 30 00~31
48.P WDB Ident value of picture start 50Hz 12 02~30
49.P WDE Ident value of blanking start 50Hz 54 21~58
50.P WBP V-blanking start value 50Hz PITTARI 72 00~75
51.P WBP V-blanking end value 50Hz PITTARI 12 00~75
52.P WBZ V-blanking start value 50Hz ZOOM 61 00~75
53.P WBZ V-blanking end value 50Hz ZOOM 23 00~75
54.P WBT V-blanking start value 50Hz TITLE IN 74 00~75
55.P WBT V-blanking end value 50Hz TITLE IN 23 00~75
56.N WDB Ident value of picture start 60Hz 15 09~30
57.N WDE Ident value of blanking start 60Hz 31 04~34
58.N WBP V-blanking start value 60Hz PITTARI 61 00~63
59.N WBP V-blanking end value 60Hz PITTARI 9 00~63
60.N WBZ V-blanking start value 60Hz ZOOM 53 00~63
61.N WBZ V-blanking end value 60Hz ZOOM 18 00~63
62.N WBT V-blanking start value 60Hz TITLE IN 61 00~63
63.N WBT V-blanking end value 60Hz TITLE IN 18 00~63
64.WCR Contrast comp. value ZOOM/TITLE IN 05 00~31
65.MAX NICAM MAX 195 00~255
66.MIN NICAM MIN 160 00~255
67.ATT NICAM ATT to equalise sound level FM/NICAM 04 00~12
68.K1 A2 STEREO K1 for stereo separation -1 -04~+05
69.K2 A2 STEREO K2 for stereo separation -11 -24~+25
70.STID A2 STEREO ident speed 00 00~02
72.TXT Maximum contrast value in the teletext 01 00~63
73.P V-W Zoom 16:9 V-Size 50Hz +14 ±127
74.P PCC Zoom 16:9 Pcc 50HZ +12 ±63
75.P H-W Zoom 16:9 H-Width 50Hz 00 ±63
76.N V-W Zoom 16:9 V-Size 60Hz 00 ±127
77.N PCC Zoom 16:9 Pcc 60Hz 00 ±63
78.N H-W Zoom 16:9 H-Width 60Hz 00 ±63
79.P WDB Zoom 16:9 Ident value of picture start 50Hz 5 2~30
80.P WDE Zoom 16:9 Ident value of blanking start 50Hz 58 21~58
81.P WBZ Zoom 16:9 V-blanking start value 50Hz 65 0~75
82.P WBZ Zoom 16:9 V-blanking end vale 50Hz 15 0~75
83.N WDB Zoom 16:9 Ident value of picture start 60Hz 9 2~30
84.N WBD Zoom 16:9 Ident value of blanking start 60Hz 34 21~58
85.N WBZ Zoom 16:9 V-blanking start value 60Hz 60 0~75
86.N WBZ Zoom 16:9 V-blanking end vale 60Hz 13 0~75
71.OSC Position of screen display 14 00~31

-19-
F2HT
1. Receive circular pattern signal.
2. Set the TV to the service mode.
3. Select service item “ 1.P V-W” by pressing the
program + or - button.
4. Adjust vertical size by pressing the level + or - button.
1. Receive circular pattern signal.
2. Set the TV to the service mode.
3. Select service item “ 2.P V-L” by pressing the program
+ or - button.
4. Adjust vertical linearity by pressing the level + or -
button.
1. Receive circular pattern signal.
2. Set the TV to the service mode.
3. Select service item “ 5.P H-W” by pressing the
program + or - button.
4. Adjust horizontal width by pressing the level + or -
button.
1. Receive cross hatch pattern signal.
2. Set the TV to the service mode.
3. Select service item “ 6.P PCC” by pressing the
program + or - button.
4. Adjust so that the vertical lines straight by pressing the
level + or - button.
1. Receive cross hatch pattern signal.
2. Set the TV to the service mode.
3. Select service item “ 8.P PHA” by pressing the
program + or - button.
4. Adjust the trapezium distortion by pressing the level +
or - button.
1. Set the TV to the service mode.
2. Select service item “ 72.OSD” by pressing the program
+ or - button.
3. Adjust the position of screen display by pressing the
level + or - button.
❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚
POSITION OF SCREEN DISPLAY
KEYSTONE ADJUSTMENT
PINCUSHION ADJUSTMENT
H-WIDTH ADJUSTMENT
V-LINEARITY ADJUSTMENT
V-SIZE ADJUSTMENT
Service mode adjustments

-20- F2HT
1
CS
-/--
0
2 3 4
5678
9
SURROUND
BASS
TV
MENU
iTV
?
XF
AB
P PWIDE
VCR
P▲
P▼
ITEM-1 SET➜0
SETTING PROCEDURE
1Press and hold the SERVICE Key on the on the front
control panel, the press the Recall button on the
remote control handset.
2To select the "ITEM" number, press the Programme
up/down button on the remote control handset.
3To select the "SET" number,press the Level
up/down button repeatedly.
4To return to the normal TV mode, press the Recall
button.
● The setting conditions of all items can be confirmed.
● Special functions are not cancelled if the TV set is
switched off or the mains disconnected.
This TV set allows you to set up the following
special functions.
■ Prohibition of presetting
ITEM-1
Sets the prohibition of presetting and CS key entry.
SET➞ 0NO
SET➞ 1 YES
■Start up programme position
ITEM-2
Presets the programme position when the set is
switched on.
SET➞ 0Last programme position start
SET➞ 1 "AV1" start
1
3
2
2
SPECIAL FUNCTIONS
1
Service Key
1