Sanyo cp21g1 schematic
SERVICE MANUAL Colour Television
Specifications
Power Source . . . . . . . . . AC220-240V, 50Hz/60Hz.
Colour System . . . . . . . . PAL (AV input: PAL/NTSC4.43/NTSC/PAL-60Hz)
Television System . . . . . . B/G
Channel Coverage . . . . .Australia
VHF: 0-11, 5A
UHF: 28-69
CATV: S1-S41, X, Y, Z, Z+1, Z+2
New Zealand
VHF: 1-11
UHF: 21-69
CATV: S1-S41, X, Y, Z, Z+1, Z+2
Video IF . . . . . . . . . . . . . . 38.0MHz
Aerial Input Impedance . . 75Ω
Ext. Terminals
Video inputs: Phono jack ✕ 2 (1Vp - p, 75Ω)
Audio inputs: Phono jack ✕ 2 (436mVrms, more than 40KΩ)
Sound Output (RMS) . . . . 2 W
Speaker . . . . . . . . . . . . . . Diameter 8 cm ✕ 2 pcs.
Dimensions . . . . . . . . . . . 502 (W) ✕ 461.6 (H) ✕ 493.3 (D)mm
Weight . . . . . . . . . . . . . . . approx. 21.5 Kg
Specifications subject to change without notice.
Original Version
Chassis Series: AC5-G
C4MV
FILE NO.
Model No. CP21G1(A)
(Australia)
Give complete “SERVICE REF. NO.” for
parts order or servicing. It is shown on the
rating plate at the cabinet back of the unit.
This T.V. receiver will not work properly in
foreign countries where the television
transmission system and power source differ from the design specifications. Refer to
the specification table.
Service Ref. No. CP21G1-50
Product Code: 111367016
REFERENCE NO.
SM5110541
V
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TV/AV
TIMER
14
7
85236
-/--
0
9
A B
BASS
SURROUND
PP
P▲
CH SCAN
SWAP
P▼
MENU
PIC MODE
JXMYA
Contents
-2-
Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chassis Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Service Adjustments with replacing Memory IC (IC802) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
Service Mode Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13
Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Special Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Purity and Convergence Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Chassis Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-23
Safety Notice
SAFETY PRECAUTIONS
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 pro-
vided 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.
X-RADIATION PRECAUTION
The primary source of X-RADIATION in 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 check 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 .
-3-
Chassis Block Diagrams
MAIN SIGNAL PROCESSING CIRCUIT
✻ Teletext decoder and SECAM
decoder are not equipped.
✻
✻
✻ Not equipped
CRT
Q901
HV
Protect
Protect
Low B
5VRC
8
IC802
MEMORY
5V-2
5
SDA
6
SCL
9V
TELETEXT UNIT
IC2001
TELETEXT DECODER
B
R
G
BLK
20
21
22
19
10
27
8
CPU
IC801
1 / 2
3
29
4
31
28
12
Key in
R/C in
CRT UNIT
180V
1
16/17
12
10
9
8
H-VCC
9V-1
AFT
IIC Bus
9V
R
5V-2
Mute
IIC Bus
BLK
VIDEO
G
TEXT:
TEXT: B
TEXT: G
TEXT: R
HOR.
VCC
RGB
VCC
CC
VERT
V
CC
IF
V
SIF
Protect
Stand by
B
VIDEO IN
B
G
R
15
14
16
18 25
43
8
52
54
SIF
out
in
36V
5V-2
Heater
BLK
17
10
AFT
X161
SAW Filter
FBT
T471
130V
9V-1
INT. VIDEO IN
VIDEO-OUT
46
IC201
5
IF in
IF in
IF OUT
9
11
7
6
180V
Q432
H-OUT
25V
15
14
IC281
SECAM
6
R-Y IN
B-Y IN
35
44
34
CHROMA
IF/VIDEO/
6
4
11/12
IIC Bus
RF AGC
VIF
RF AGC
1
A101
TUNER
Heater
T431
TRANS.
H-DRIVE
13
SECAM KILLER
7
R-OUT
42
Ext.VIDEO-IN
4/5
Low B
Q431
B-OUT
G-OUT
20
19
51
Ext.AUDIO-IN
ABL
AFC
24V
H-DRIVE
H-OUT
21
27
1
AUDIO-OUT
V-OUT
23
13
28
40
2
H
L902
DY
5
2
IC501
ABL
1
V
VERT./DEF.
AFC
Protect
POWER SUPPLY CIRCUIT
5VRC
Reg.
T611
TRANS.
CONVERTER
9
15V
AUDIO MONITOR OUT
SELECTED VIDEO OUT
5V-2
Reg.
9V
3
MUTE
9V-1
15V
IC001
AUDIO AMP.
H-VCC
Reg.
24V
SP901
AUDIO
OUT
7
(MONO)
5
AUDIO-IN
36V
Reg.
130V
VR631
SWITCH
Front
key
RC
A1901A
PRE-AMP.
D1910
LED
ANT
IIC Bus
VIDEO IN
AUDIO-IN
FRONT
AV IN
AUDIO-IN
VIDEO IN
REAR
AV IN
AUDIO MONITOR OUT
VIDEO MONITOR OUT
REAR
MONITOR
OUT
-4-
Chassis Block Diagrams
SYSTEM CONTROL
IC801
CPU
QXXAVC305P
A101
F/S TUNER
CIRCUIT
DEFLECTION
IC201
etc.
29
KEY
SWITCH
KEY SWITCH IN
12
CPU
IC801
QXXABV864
13
SCL
2
SDA
1
IF/VIDEO / CHROMA/DEF.
PHOTO COUPLE
POWER ON/OFF
(ON=HIGH, OFF=LOW)
31
AFT SIGNAL INPUT
OSD BLK OUT(Active=High)
22
10
28
OSD BLUE OUT(Active=High)
OSD GREEN OUT(Active=High)
OSD RED OUT(Active=High)
19
20
32
211817
6
POWER CIRCUIT
HORIZ. SYNC IN (ACTIVE=LOW)
VERT. SYNC IN (ACTIVE=LOW)
(POWER ERROR=LOW)
POWER PROTECT IN
27
34
SDA
SCL
56
IC802
MEMORY
7
MUTE OUTPUT
(MUTE ON=HIGH)
3
IC001
(MONO)
AUDIO AMP.
RESET INPUT (ACTIVE=LOW)
RC SIGNAL IN
(ON TIMER ON=Low)
(ACTIVE=HIGH)
ON-TIMER LED OUT
RC PRE-AMP.
LED
CPU OSC OUT
CPU OSC IN
OSC
X801
32.768KHz
-5-
IC Block Diagrams
IC201 < IF/Video/Chroma/Def. > LA76818A
Audio Output
FM Output/Selected
Audio Output
PIF AGC
RF AGC Output
PIF Input1
PIF Input 2
IF Ground
IF Vcc
FM Filter
AFT Output
Bus Data
Bus Clock
ABL
Red Input
Green Input
Blue Input
Fast Blanking Input
RGB Vcc
Red Output
Green Output
Blue Output
fsc output or C
Sync output
Vertical Output
Ramp ALC Filter
Horizontal/BUS Vcc
Horizontal AFC Filter
Horizontal Output
VOL
DC
1
2
3
AGC
RF
4
56
7
VCC 5V
IF
8
9
10
11
BUS
12
ABL
13
14
CLAMP
15
16
17
18
VCC
19 20
DRIVE/OUT-OFF
21
SYNC SW
FSC/
22
23
RAMP
VER
24
HOR
VCC
25
VCC
H
26 27
HOR
OUT
SW
AGC
VIF
CONTRAST
BRIGHT
OSD
OSD
SW
VER
C/D
SHIFTER
PHASE
IF
VER
SEP
AFC2
CORING
REST
BRIGHT
MATRIX
DET
PEAKING
STRETCH
BLACK
DC
CONTRAST
RGB
FM
SEP
AFC1
DET
DELAY
LINE
SYNC
AMP
VIDEO
AFT
ACC
DEMO
COLOR
CLAMP
HOR
C/D
LIM
TRAP
SW
BPF
TRAP
SW
ON/OFF
BPF
PA L
CLAMP
SW
+
ALC
LPF
1/256
IDENT
IF
VIDEO
SW
APC1
TINT
VCO
HOR
VCO
SPLL
VIDEO
AMP
DC ADS.
1H DELAY
VXO
DDS
APC2
BPF
A2C
PLL
CLMP
CLMP
CLAMP
FBP
SIF Input
SIF APC Filter
525354
SIF Output
51
Ext. Audio Input
APC Filter
4950
VCO Coil 1
48
VCO Coil 2
47
VCO Filter
46
Video Output
Black Level Detector
4445
Internal Video Input (S-C IN)
V/C VCC
43
5V
Video/Vertical Vcc
42
External Video Input(Y-IN)
41
Video/Vertical/BUS Ground
40
Selected Video Output
39
Chroma APC1 Filter
38
4.43 MHz Crystal
Clamp Filter
Chroma APC2 Filter
353637
SECAM R-Y Input
(Cr Input)
34
SECAM B-Y Input
(Cb Input)
33
CCD/Horizontal Ground
32
CCD Filter
31
VCC
CCD Vcc
1H
30
Clock (4MHz) Outupt
VCO IREF
2829
Flyback Pulse Input
IC Block Diagrams
-6-
IC201 <IF System Block Diagram> LA76818A
1K
SIF
1000p
APC
Filter
10p
0.01u
SIF.In
SIF.Out
Deem-TC
LIM
53
500K
54
52
1bit
1bit
FM Gain
FM
AMP
500K
Det
Amp
Sound
Det
Snd
FM
Det
BPF
BPF
Out
2
De-
Amp
+
Amp
emph
-
FM.Level
SIF
VCO
0.01u
5bit
pre-
SIF. Sys
+
9
-
+
APC
scaller
2bit
FM
Filter
1u
1 bit
FM Mute
2.5V
C/D
Chroma
Det
C/D
OSC
Video
Det
Video
Out
46
Amp
Tr ap
Sound
+
10u
Audio in
51
To
BUS
IF
Ident
B/N
INV
Video.Level
Audio.out
1
(ATT)
VOLUME
Input
Select
3bit
1bit
A.Fil.Def
Filter
VOLUME
1bit
A.SW
VCO
Chroma
7bit
VOLUME
D/A
VOLUME
1bit
A.MUTE
Buzz
Canceller
0.1u
Vcc
Detector
2bit
VIF.Sys
Pulse
Reset
BUS
AFT
100K
10
AFT
Chroma
Counter
VIF
VCO
PLL Pull-in SW
Det
APC
100K
49
48
50
VCO
COIL2
VCO
COIL1
APC
330
Filter
+
VCO.Coil
0.47u
VCO
Filter
+
0.47u
47
VCO
Alignment
Phase
VCO
Ident
VIF
Counter
To
Det
Lock
-π/4
+π/4
Clock
Data
IF
AGC
To
VIF 3
to BUS Line
VIF 2
12
BUS
11
Interface
VIF AMP
5
In1
PIF
IF In
VIF 1
6
SAW
PIF
IF AGC
In2
9V
AGC
2ndIF
Def
1bit
Drive
RF
AGC
RF AGC
30K
120K
4
+
Out
RF AGC
IF AGC
6bit
Delay
IF VCC
BUS
-
+
(6 Vcc)/7
8
+
IF
7
GND
3
PIF
AGC
0.022u
-7-
IC Block Diagrams
IC501 < Vertical Output > LA78040/LA78040N
IC001 < Audio AMP.> LA4266
Service Information
This TV set has a built-in power supply protection circuit.
It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality
occurs during TV reception, the TV set goes to the stand-by mode.
When an abnormality occurs during TV reception, it causes pin 27 of the CPU to go continually Low(less than
0.75V) for about one second. The CPU detects that this has occurred and outputs the signal from pin 31 to
switch off the power supply lines.
Releasing the protective circuit and restoring power supply
To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON again
via either the main power switch or the ON-OFF button on the remote control. This will work only if the power
supply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be
restored and the circuit will have to be repaired.
■ Protection Circuit
Thermal
Protection
-
AMP
+
Pump
Up
1
INVERTING
INPUT
2
Vcc
3
4
GND
PUMP UP
OUT
5
Ver. OUTPUT
12
NC NC
34
Filter PRE
GND
6
7
NON INV.
OUTPUT
STAGE Vcc
300Ω
5
IN2
INPUT
NF2
6
30kΩ
OUT2
7
8
Power
9
VCC NC
10
GND
-8-
Service Adjustments with Replacing Memory IC(IC802)
Note: The CPU (IC801) and memory IC (IC802) store the service adjustments data and controls data for each
circuit.When the Memory IC(IC802) is replaced, some of the service adjustments should be readjusted to
obtain the best performance. The necessary service adjustments are carried out by using the RC handset.
Please set up the TV set with following steps [1] to [2].
[1] Initializing Procedure
1. Put a new memory IC.
2. Turn on the TV set.
3. Press and hold the TV/AV Selector on the TV set for more than 2 seconds. The following picture appears on the
screen.
4. Press the PROGRAMME UP on the TV set while the above On-Screen Display is still on the screen. The following
picture appears on the screen.
This completes the initialization of memory IC.
Following shows the initialized contents of memory data by this procedure.
- Plug & Play : No executed
- Inhibit Data : Cancelled
- Ch Skip Data : Cancelled
- Sound Volume Data : 10/63 steps.
- Volume Lock : OFF
- Tuning Lock : OFF
- Music Mode : OFF
- AV Start : OFF
- Colour System : AUTO
1
CLR
TV/AV Selector
PROGRAMME UP
[2] Required Service Adjustments
Readjust the following service adjustments.
Adjustments
Service Mode No. & Item
RF AGC Item 01, RF AGC
Horizontal centre Item 02, H-PHA
Vertical size Item 04, V-SIZ
Vertical-S correction Item 05, V-SCO
Vertical linearity Item 06, V-LIN
Gray scale Item 14-17, 19-21
Further adjustment please refer to page 12 and 13.
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