Sanyo C28WN1 Schematic
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
SYSTEM CONTROL
IC101
TDA8361
IDENT 4
COLOUR 26
BRIGHT 17
CONTRAST 25
SHARPNESS 14
AFT 44
D/A
CONVERTER
CIRCUITS
I DENT
CHROMA ID
KEY IN
RC SIGNAL
COLOUR
BRIGHTNESS
CONTRAST
SHARPNESS
SCLK
DATA
I2C BUS SW.
IC801
M37207MB-
1
2
4
5
8
9
10
11
13
14
15
60
63
62
61
60
59
57
56
55
53
52
Vcc +5V
H-SYNC
V-SYNC
OSD RED
OSD GREEN
OSD BLUE
OSD BLANKING
POWER ON/OFF
LED DRIVE
AV1 SW
AV2 SW
FBP
SANDCASTLE PLS
TO
Q203,
Q204,
Q205
TO IC201PIN21
TO IC1001
PINS 6, 12
TO Y/C SEPARATION
BOARD
TO SUB VIDEO
BOARD
SYNC ID
PAL/NTSC
THRESH HOLD
SQ
CLK
SI
AFT
I2C SCL
I2C SDA
OSC
OSC
16
17
19
20
21
22
23
25
26
30
31
46
45
44
43
42
41
36
34
33
SOUND MUTE
LINE MUTE
SC1 FUNCTION
FROM
SC2 FUNCTION
POWER FAILURE DET.
IGNORE
TITLE IN
PITTARI
NORMAL
SCART1, 2
TO
DEFLECTION
BOARD
-4-
F2HT
CHASSIS BLOCK DIAGRAMS
CRT
CRT BOARD
Q2761
Q2772
Q2782
VIDEO-OUT
R/G/B
TELETEXT BOARD
R/G/B/BLK-OUT
VIDEO-IN
Q203
Q204
Q205
201918
45
46
R/G/B BUFFER
BLK-IN
21
R/G/B/BLK FOR OSD FROM CPU
R/G/B-OUT
IC101
TDA8361
<IF/VIDEO/CHROMA>
X101
SAW
Q101
1
A101
TUNER PACK
Q135
Q132
Q134
EQUALISER
SIF TRAP
Q122
VIDEO-IN(INTERNAL)
VIDEO-OUT
7
13
Y-IN
15
303128
R-Y/B-Y-OUT
161411
IC270
TDA4661
<1H DELAY>
C-IN
16
12
R/G/B-IN
222324
29
R-Y/B-Y-IN
AV1
AV2
TV-IN
MONITOR-OUT
35
IC1001
TA8747N
<AV SELECTOR>
R/G/B/BLK-IN
C-OUT
28
33
1
VIDEO-IN
Y-OUT
31
6
12
25
7
VIDEO-IN
2313
VIDEO-IN
BACK BOARD
BLOCK DIAGRAM <VIDEO SIGNAL PROCESSING>
FROM
CPU
AV1
AV2
AV3
-5-
F2HT
FRONT
L SPEAKER
FRONT
R SPEAKER
HEADPHONES
12
IC001
AUDIO OUTPUT
IC3451
2
FOR FRONT
<TA8200AH>
L
NICAM
<SAA7283>
IC3401
<TDA9840>
DUAL SOUND
7
4
R
8
7
16
L
R
AMP
IC3451
IC3501
Monitor-out
3D SURROUND
L
R
8
15
7
16
L
14
7
29
9
NICAM
NICAM
BOARDD
R
13
8
IC1001
AV SELECTOR
TV-out
L
14
3
<M5228FPG>
L
13
23
L
<MM1369AD>
27
2
36
<TA8747N>
TV-L
AV1-L
AV2-L
8
R
8
5
R
11
1
R
26
14
TV-R
AV3-L
34
AV1-R
4
10
AV3-R
AV2-R
16
BACK BOARD
AF2
AF1
8
7
MAIN
12 1
1
15
SUB
16
SIF BOARD
IC3811
<TDA9821>
A2 STEREO
SIF
IC3801
<TDA2545A>
Q101
A101
TUNER PACK
BLOCK DIAGRAM < AUDIO SIGNAL PROCESSING>
SIF
MONO.
1
6
IC101
IF/VIDEO/CHROMA
<TDA8361>
AV1
AV2
AV3
-6-
F2HT
BLOCK DIAGRAM <H&V DEFLECTION>
IC101
VIDEO/CHROMA/DEFLECTION
<TDA8361>
H-DRIVE
37
Q402
ABL
MODE SW
FROM CPU
NORMAL/
PITTARI
IC531
V-DRIVE
<TA8859AP>
T401
H-DRIVE
Q403
H-OUTPUT
PCC
Q461
Q462
IC521
PCC
<BA4558N>
7
8
IC423
1
3
4
C421
C422
C465
L461
C424
Q421
S-C
SW
C425
C426
C427
T402
FLYBACK
HIGH
VOLTAGE
DELECTION
YOKE
HORIZ.
VERT.
C512
42
39
VR371
H-CENTRE
V-DRIVE
SCL
SDA
I2C BUS
10
1
13
9
PCC
2
V-TRIGGER
8
6
V-FEEDBACK
IC501
V-OUTPUT
<LA7833>
4
R512
2
-7-
F2HT
IC BLOCK DIAGRAMS
TDA8361 <IF/VIDEO/CHROMA/DEF.>
TO
TDA4661
DET
BYO
BYO
31
33
30
BYI
28
FROM
TDA4661
RYI
29
RO
BI
GI
RI
23
24
22
BO
GO
20
18
19
XTAL2
XTAL1
FBI/SCO
PH2LF
PH1LF
V RAMP
HUE
XTAL OUT
H OUT
V OUT
H OSC
VFB
27
CLAMP
PHASE
HUE
CONTROL
3235
3437
XTAL
OSCILLATOR
38
39
PHASE 2
36
40
PHASE 1
42
41434448
VERTICAL
OUTPUT
DETECOR
SYSTEM
MANAGER
TUNING
LINE
OSCILLATOR
VERTICAL
DIVIDER
DEMODULATOR
COLOUR
KILLERS
COINCIDENCE
DETECTOR
H AND V
SEPARA TION
POWER
RESET
CLAMPS
SET
MATRIX
ACC
AMPLIFIER
NOISE
DETECTOR
TDA8361
SWITCH
LUMINANCE
MATRIX
CHROMINANCE
BANDPASS
CHROMINANCE
SWITCH
TRAP AND
BYPASS
17
OUTPUT
STAGES
21
26
25
PWL
Y DELAY
PEAKING
13 15 14
LUMINANCE
SWITCH
12 16
TUNING
BRI
RGBIN
CON
PEAK IN
CVBS
EXT
CVBS
INT
CHROMA
COLOUR
DEC
FT
DEC
AGC
AFCOUT
AGC OUT
AU OUT
IDENT
4750
4
AGC
IF
45
IF IN1
AMPLIFIER
49
46
IF IN2
TUNE ADJ
AFC AND
SAMPLE
AND HOLD
DEMODULATOR
3
2
FM DEM1
7
IFVO
FM DEM2
VIDEO
AMPLIFIER
VIDEO
IDENTIFICATION
1
AUDEM
6
PREAMPLIFER
MUTE
SWITCH
VOLUME
51
DECDEM
EXTAU
PLL
LIMITER
5
SOIF
TEST
SUPPLY
8
DEC
DIG
10 52
DEC BG
Vp
11 9
GND2 GND3
-8-
F2HT
TDA4661 <1H DELAY LINE>
TA8859AP <DEFLECTION CORRECTION>
LA7833 <VERTICAL OUTPUT>
16
±(R-Y)
colour-difference
input signals
±(B-Y)
Vp1
sandcstle
pulse input
SIGNAL
CLAMPING
14
9
analogue supply
5
SANDCASTLE
DETECTOR
SIGNAL
CLAMPING
10
GND1
pre-amplifiers
FREQUENCY
PHASE
DETECTOR
LINE
MEMORY
LINE
MEMORY
DIVIDER
BY 192
LP
digital supply
SAMPLEANDHOLD
SAMPLEANDHOLD
3MHz shifting clock
6 MHz
CCO
1
Vp2
LP
addition
stages
LP
TDA4661
DIVIDER
BY 2
GND2
output
buffers
3
11
colour-difference
output sugnals
12
2
6
n.c.
13
n.c.
15
7 i.c.
4,8
±(R-Y)
±(B-Y)
n.c.
n.c.
16
AGC
PALABOLA
CORR.
1
ETH IN
RAMP
VCC
6
15
∫
2
ETH
14
PULSE
SHAPER
CORRECT
3
Vcc
DRIVE
TRIG
IN
13
TRIGGER
LINEARUTY
CORRECTION
ETH
CORR.
EW
ETH
CORR.
F/B
12
11
PULSE INFERFACE
S-C CORR.
TA8859AP
654
GND
3
VERT
F/B
7
PUMP UP
10
7
SCL
9
8
SDA
VERT.
DRIVE
V-DRIVE PLS
INPUT
4
VERTICAL
DRIVE
15
GND
VERTICAL
OUTPUT
THERMAL
PROTECTION
2
V-OUTPUT
LA7833
-9-
F2HT
TA8216H/TA8200AH<AUDIO OUTPUT>
TA8747N <AV SELECTOR>
R IN
RE4
Vcc
32
16 10
TA8747N
29
24
GND
MODE OUT
E3
R
RE2
4
MUTE
AUDIO
DECODER
18
22
SW3
MUTE
E1
R
20 34
SW2
RTV
612
SW1
L IN
LE3
LE4
14 8 2
R OUT
LE2
MUTE
2726
L OUT
13
31
E3
E2
71
VIDEO IN
CLAMP
28
E1
TV
21 35
X2
30
MONITOR OUT
C IN
TV
LE1
L
C3
C2
19
36
VIDEO
17
11
X2
33
C OUT
Y IN
Y 3
C1
5
23
15 9
÷2
C IN
Y2
Y1
X2
25
Y IN
E4
3
Y OUT
COMB
FILTER
AMP2
12 3456789101112
GND
AUDIO
IN2
AUDIO
IN1
AMP1
RIPPLE
FILTER
OUT1
TA8200AH
GND
VCC
SPEAKER
OUT2
SPEAKER
-10-
F2HT
TDA9821 <DUAL CHANNEL SOUND DEMODULATOR>
TDA2545A <SIF DEMODULATOR>
38.9MHz
9
REF.
AMP.
DEMODULATOR
10
LIMITER
AMP.
14
5.5MHz
(5.742MHz)
IF
INPUT
TDA2546A
1st Sound IF &
Demodulator
17
18
1
2
AGC
DEMO.
3
LIMITER
AMP.
12
External
FM demodulator
5.5MHz
(5.742MHz)
87
2nd Sound IF
& FM Demo.
FM
DEMO.
13 11 5
6
4
Cd
OUTPUT
MUTE
INTERCARRIER
5.5MHz (B/G)
5.74MHz (B/G)
TDA9821
1
15
SUPPLY
13 14 12 11
Vp
7-STAGE
LIMITTER
AMPLIFIER 1
7-STAGE
LIMITTER
AMPLIFIER 2
REF
VCO
OPTIONAL STEREO
CHANNEL SEPARATION
ADJUSTMENT
MUTE
VCO1
VCO2
9
10
8
VAF1
VAF2
7
-11-
F2HT
SAA7283ZP <NICAM DECODER>
TDA9840 <STEREO/DUAL SOUND PROCESSOR>
MIXREF
DQPSK
SOFF
SEYE
23
28
29
QUADRATURE MIXERS, BASEBAND FILTERS
AND AGC GAIN STAGE
2430313637
26
COFF
VSSF1
CEYE
VDDF1
PKDET
3222
SINE
AGC
CONTROLLER
COSINE
CARRIER LOOP
PHASE DETECTOR
AND DATA SLICERS
21 20
REMO
VSSF2
VDDF2
REMVE
34 33
IREF
35 39
VRCF
VROF
VCONT
VCLK
27
CARRIER LOOP
QUADRATURE VCO
BIT RATE
CLOCK RECOVERY
48
CLKLPF
DATAOUT
PCLK
TEST
4525
43 40
XTAL
DATAIN
RESET
MUTE
PORA
PORT2
PORM
19
1524738
18
NICAM 728 DECODER AND
DEVICE CONTROLLER
XTAL
OSC
50
42
41
SDA
OSC
VSSX
DIGITAL FILTER, GAIN,
IIC
DAI
246
51
49
SCL
DOBIA
ADSEL
EXT-L
EXT-R
6
SAA7283ZP
NOISE SHAPER
(RIGHT CHANNEL)
DE-EMPHASIS
NOISE SHAPER
(LEFT CHANNEL)
44 12
VSSD
VDDD
VSSDAC
7
OUTPUT SWITCHES
BITSTREAM DAC
9RIGHT CHANNEL)
BITSTREAM DAC
(LEFT CHANNEL)
161734
AND BUFFER
OUTPUT SWITCHES
AND BUFFER
(LEFT CHANNEL)
EXTL
EXTL
VSSA
VDDA
(RIGHT CHANNEL)
11
VROA
REPRESENTS CONTROLLER BUS
8
15
5
VRCA
OP-R
OP-L
V
i1
AF1
250mV RMS
(from 1st SC)
250mV RMS
(from 2nd SC)
AF2
V
i2
CDCL
CAGC
CLP
Vipil
7
8
LEVEL
5
4
2
3
-2dB
0 to 4.5dB
-2dB
0 to 4.5dB
STEREO
LEVEL AND
STEREO
ADJUSTMENT
0 to 4.5dB
A/MONO
250MV RMS
TDA9840
DIGITAL
PLL
OSCILLATOR
19
XTAL
CD1
L/A/MONO
250MV RMS
L
R/B
DIGITAL PLL
AND
DEMODULATOR
DITAL PLL
AND
DEMODULATOR
GENERATION
VREF
OF
REFERENCE
VOLTAGES
1/2 Vp
CD2
15 17 9
6
18
Vi3
Vi4
500mV RMS
10
MUTE
DIGITAL
INTEGRATOR
DIGITAL
INTEGRATOR
POWER-ON
RESET
16
GND
6dB
6dB
6dB
6dB
DUAL bit
STEREO
bit
CONTROL
LOGIC
500mV RMS
500mV RMS
500mV RMS
500mV RMS
IIC BUS
CONTROL
14
13
12
11
20
V o1
MAIN
Vo2
V o3
SCART
Vo4
SCL
SDA
1
Vp
-12-
F2HT
TDA8424 <SOUND CONTROLLER>
MM1369AD <3D SURROUND PROCESSOR>
L-IN
R-IN
1
3
MODE
SELECTOR
TDA8424
mono
stereo/spatial
stereo/mono
spatial
stereo/mono
stereo/spatial
Vcc
mono
spatial
POWER
SUPPLY
GND
bass L
16
Vcap
15
SDA
bass R
6
IIC BUS
7
volume
1211254
treble L
14
bass
balance
10
D.GNDSCL
treble R
8
13
L-OUT
treble
9
R-OUT
Vcc Lin Gl1 Gl2 Gl3 Gl4 Fc Qf1 Qf2 Qf3 Qf4 Lout
24 23 22 21 20 19 18 17 16 15 14 13
SIMULATED
STEREO
MM1369AD
SIMULATED
STEREO
1 2 3 4 5 6 7 8 9 10 11 12
Rin Gr1 Gr2 Gr3 Gr4 M/g Ref SPC Qi S/Q Rout Gnd
gm
VIRTUAL AUDIO
QXPANDER PROCESSOR
SERVICE CONTROL ADJUSTMENTS
Main Board
IC801
CPU
C673
C671
671
OARD
C805
SERVICE
C806
SUB VIDEO BOARD
BACK BOARD
IC802
MEMORY
C810
K2E
NORMAL
SW220
SERVICE
SWITCH
R014
X801
TP-D
C218
C205
C275
Q809
Q808
TP-E
K8H
K2L K2M
C013
Q134
X127
C138
IC101
IF /VIDEO/COLOUR/
DEF.
X127
C375
C371
VR371
H-CENTRE
KOE
X126
X101
C009
T121
AFT
C104
C050
C012
1C3431
VR120
AGC
C003
SIF BOARD
C131
KIG
C010
C006
C003
C002
C103
C101
A101 TUNER
NICAM/STEREO BOARD
C102
TP-A
K2A
K2B
Grey Scale Adjustment
AFT ADJUSTMENT
1. Receive the clearest station.
2. By using T121, adjust AFT to obtain the best
picture.
AGC ADJUSTMENT
NOTE:
weak signal.
1. Receive the clearest station.
2. Set AGC VR(VR120) in direction which causes
Do not attempt this adjustment with
snow noise to appear, then in the opposite
direction until snow noise just disappears.
H-CENTRE ADJUSTMENT
1. Receive circular pattern signal.
2. Adjust H-centre by using VR371.
CRT Board
Q706
K17J
K17P
K27B
BLUE OUT
K761
Q782
RED OUT
GREEN OUT
K27V
Q762
Q772
Q152
Q781
Q101 Q180
Q761
K7Y
Q153
Q771
K27E
C792
VR782
BLUE BIAS
VR762
RED BIAS
VR772
GREEN BIAS
VR781
BLUE DRIVE
VR761
RED DRIVE
GREYSCALE ADJUSTMENT
[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 counterclockwise.
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.
F2HT
-13-
SERVICE CONTROL ADJUSTMENTS
Power & Deflection Board
K6G
L633
C491
C402
T401
C481
Q633
POWER
DRIVE
Q402
K4H
C633
Q634
POWER
SWITCH Q632
L461
Q403
HORIZ.
OUTPUT
K4C
FOCUS
R426
T402
FLYBACK
TRANS.
T611
CONVERTER
TRANS.
L425
Q631
K4A
SCREEN
L704
K4S
C486
IC611
C482
Q616
Q461
IC423
Q461
C521
L462
L502
Q462
C624
C616
Q615
C506
C504
C618
IC501
VERT.
DEF.
K6D
HORIZ DRIVE
TRANS.
C652
C531
Q531
IC531
C621
Q614
DOWN
C542
IC651
Q505
UP
C512
C651
Q501
SW501
V-CENTRE
C546
IC481
K6A
KB4
K4E
Q542
Q541
C543
V-CENTRE ADJUSTMENT
1. Receive circular pattern signal.
2. Adjust V-centre by using SW501.
FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for well
scanning lines.
HIGH VOLTAGE
[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.
Sub Video Board
TP1311
C2512
C2511
IC2501
BLACK LEVEL
ADJ.
K20J
X1301
C1318
VR1301
IC1303
SUB CPU
IC1302
C1335
K20H
TP1310
C1324
IC1301
C1301
VR1302
C1331
-14-
H-BLANKING ADJUSTMENT
NOTE:
1. Receive circular pattern signal.
2. Set screen mode to NORMAL.
3. Adjust right and left blanking width to be equal by
This must be done after picture size
adjustment.
using VR1301(right) and VR1302(left).
F2HT
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
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
Tool A: 0.01uF
Tools
Marker frequency
39.5MHz --> C28WN1B
38.9MHz --> C28W1/WN1
-15-
F2HT
SIF Board
VIF Alignment
SIF Alignment
MAIN Board
Q134
MAL
75
C218
Q808
C205
TP-E
K8H
Q809
X126
X127
C138
IC101
IF /VIDEO/COLOUR/
DEF.
X127
C375
C371
VR371
H-CENTRE
X101
C104
C050
T121
AFT
1C3431
VR120
AGC
SIF BOARD
C131
A101 TUNER
C103
C101
NICAM/STEREO BOARD
C102
K2A
K2B
10kΩ
0.002µF
75Ω
1kΩ
a
b
P
0.01
K2L K2M
C3807
T3801
KIG
X3801
TP-A
P
"A"
K38H2
IC3801
K38H2
CIRCUITALIGNMENTS
PILOT ALIGNMENT
SETTING
Oscilloscope
Input sound signal source
TV system
Deviation
Mode
NICAM&Stereo Board
C3414
X3401
IC3451
IC3401
TJ3401
L3454
C3478
X3461
C3467
C3469
C3472
C3462
C3464
C3433
C3431
C3432
C3495C3488
1C3431
C3482
C3484
C3485
C3486
C3492
C3494
C3409
C3405
C3405
C3408
IC3401-pin5
System B/G
27kHz
Stereo
Pilot Alignment
Required only model C28W1/WN1
Not Required model C28WN1B
Adjustment
By using T3401, adjust
amplitude to be maximum.
Waveform
A
K34B
K34A
F2HT
-16-
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