Sanyo CZP2530TXN User manual

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SERVICE MANUAL
FILE NO.
Colour Television Model No. CZP2530TXN
CZP2930TXN
(New Zealand)
Service Ref. No. CZP2530TXN -00
Specifications
Power Source,,,,.,,., ........... AC220-240V, 50Hz
Television System ............. B/G
PAL (AV input: PAL/NTSC/NTSC4.43)
Channel Coverage ............. VHF: 0-11
UHF: 21-69
Video IF............................. 38.9 MHz
Sound IF............................ 33.4 MHz
Aerial Input Impedance ...... 75 Q
Ext. Terminals .................... Video inputs: Phono jack x3(lVP –p, 75 S2)
S-terminal x2DIN 4pm separate,
\
Y/C signal input
Audio inputs: Phono jack (R/L) x3(436mVrms,
more than 40K Q)
Audio monitor outputs: Phono jack (R/L) x1(436
Vrms, less than 600 Q.)
TV outputs (video and audio :
b
Video output- hono jack x1
Audio output- Phono jack (R/L) x2
External speaker terminals: 8S2,output max. 5W
Headphone jack: Mini. stereo jack
Dimensions ........................ CZP2530TXN: 672 W)x516(H x446 Dmm
[1[1
CZP2930TXN: 744 W) x589(H x492 Dmm
Weight ............................... CZP2530TXN: approx. 28Kg
CZP2930TXN: approx. 41 Kg
Specifications subject to change without notice.
CZP2930TXN -00
Product Code: 111314616 (CZP2530TXN)
111314516 (CZP2930TXN)
Original Version
Chassis Series: A8-A25 /A8-A29
Give complete “SERVICE REF. No.” for parts
order or servicing., It is shown on the rating plate
at the cabinet back of the unit.
F
This T.V. receiver will not work properly in
foreign countries where the television trans -
mission system and power source differ from the
REFERENCE NO. SM 520008
E5ZVIE5YV

I
A
I
ANT
T
N,aa
t
Sound
l.- Audio
lr
-. Selector
uPC1891CX Control
AN5836
,)F—
AV Switch
Video TA8747N Colour Decoder/
...1H/V Driver
AV :TDA9160
lN/OUT ~e Video
aHDrive
C,Y
-. ...4 VDrive
BACK TML
PCB ASSY
TEXT PCB ASS
TELETEXT
Decoder 4
-i
Video
14:SCL II
5:SDA
h-’
YVideo
YFeature Controller
t!i+-:
CXA1 420P TDA468!
R-YiB-Y W9V 3Y
2:SCL
1,9 2&SCL
5V 1:SDA 27SDA
R-YIB-Y
1HDelay
TDA4661 6V
RGB
tiAIN PCB ASSY
Speaker
aCRT PCB ASSY
RGB Drive
TDA6101 Q/N2X3
RGB
t
RGB CRT
62
\
r......1
IVelocity 1
J
HV
Yb:-. -.-L
m180V
Vertical Output Def Iection
TDA8172 Yoke
H
POWER &DEF.
PCB ASSY
II CPU II*C BUS
Time Base M37102M8 Memory
Digital Control
(Audio)
wPD6326C
11:Volume Data,
Band 12:Surround Clock,
LA791O 13:Balance 4Load
14 Treble
,6 15:Bass
@and
+
TU
Band Data
21:SCL 22:SDA h12C BUS
Switch
4066B
14 ,. ..-7
4:SCL 3:SCL ISCL I
I
SCUSDA 2:SDA 1:SDA sSD/+ ;
r .-. ..J
(

Circuit Description
—
a
“.
. .
L- -
1-1. Video signal routing
Video signals output from IF pack are input to AV
switching IC (TA8747N). In this IC, they are switched to
AV signals. Colour. Yor composite signals output from
TA8747N are input to Colour Decoder &H/V Drive IC
(TDA9160) and Ysignal is input to the Teletext Decoder.
All functions of TDA9160 are controlled by 12CBus lines
(SCL:Serial Clock/ SDA:Serial Data) of CPU. Ysignal
output from TDA9160 is input to YFeature IC (CXA
1420P) for the aperture control and black expand and
input to the velocity circuit. Ysignal output from CXA
1420P is input to Video Controller IC (TDA4685). Colour
differential signals (R- Y/B- Y) demodulated byTDA9160
are input to 1Hdelay IC (TDA4661 )as 1Hdelay and
matrix and output to TDA4685 as proper colour
differential signals. In TDA4685, colour differential signals
are converted to RGB signals, RGB signals from Teletext
decoder or CPU are super- imposed on them, and RGB
signals are output to RGB Drive IC (TDA6101Q/N2). CXA
1420P and TDA4685 also are controlled by 12CBus lines.
1-2. Audio signal routing
SIF signals output from IF pack are input to A2 stereo
decoder and NICAM stereo decoder. Stereo signals
detected by both decoders are input to AV switching
IC(TDA8747N). After switching to external audio signals
in this IC, they are input to Sound Selector IC
(MC140538CP) as selecting an L channel, an Rchannel
or both channels. Audio signals output from MC
140538CP are input to the Surround IC as mixing
surround signals in surround mode. Output signals are
input to Audio Control IC (AN5836). Bass, treble,
balance and volume control is applied to signals, which
are amplified by Audio Output IC (LA4720), and output to
the speakers.
2. CPU (IC801) Pin Description
Pin 1: Oscillator for OSD (in)
Pin 2: Oscillator for OSD (out)
Pin 3: ABL voltage (in)
Ov- 5V
Pin 4: Brightness sensor (in)
Ov- 5V
Pin 5: Remote control input (active low)
Pin 6: Tuning voltage (out)
Pin 7: Band data (out)
Pin 8: Band data (out)
Pin 9: AFT input (1)
L:No signal
Pinl O:AFT input (2)
L: No signal
Pinl 1: AFT ON/OFF (out)
L: AFT ON
Pinl 2: Picture (TEXT) ON (in)
L: TEXT/TV mixed mode
–2–
Pin13: 12CBUS switching (out)
H: Normal
Pinl 4: RGB IGNOR output
H: IGNOR ON
Pinl 5: Woofer ON/OFF output
H:Woofer ON
Pinl 6: Not used
Pinl 7: Forced time base input
L: Forced time base is input (Factory mode)
Pinl 8: Setting to factory mode tin)
L: Factory mode
Pinl 9: Overload protector input
L: ProtectorON
Pin20: SCART option switch input
L: No SCART
Pin21: 12CBus (SCL: Serial Clock)*
Pin22: 12CBus (SDA: Serial Data) *
‘To control TDA9160, TDA4685,
NICAM decoder] CXA
Pin23: Load output for DAC (Digital Analo
Pin24: TEXT DLIM (out)
Pin25: Clock output for DAC
Pin26: DAC &TEXT Data (out)
Pin27: Ground
Pin28: Not used
Pin29: RESET (in)
Pin30: Oscillator input for CPU (4MH2)
Pin31: Oscillator output for CPU (4MH2)
Pin32: Ground
Pin33: Power ON/OFF (out)
H:Power ON
Pin34: Power error output
H: Normal, H/L switching: Error
Pin35: TV/AV switch 2(out)
Pin36: TV/AV switch 1(out)
=
420P and
Iue Converter)
Pin37: SCART 8pin input
Hto L: Switched to AV3
Pin38: Stereo control output 3
Pin39: Stereo control output 2
Pin40: Stereo control output 1
TV mode
Stereo Main(A) Sub(B) Mono Forced Mono
Pin 38 L HLHH
Pin 39 L LHLL
II
lPin 40 ILLH[H H
AV mode
Stereo Left(A) Right(B) Mono
Pin 38 LHLH
Pin 39 LLHLor H

Circuit Description
Pin41: Switch for S- VHS (in)
H: S- VHS mode (Y/C separated mode)
Pin42: Skew output
H: Skew ON
Pin43: A2 stereo data input 1
Pin44: A2 stereo data input 2
Pin45: Sound mute (out)
Pin46: Line mute (out)
H: Mute ON
Pin47: Option switch scan output 3
Pin48: Option switch scan output 2
Pin49: Option switch scan output 1
Pin50: Key scan output 3
Pin51: Key scan output 2
Pin52: Key scan output 1
Pin53: Key scan input 4
Pin54: Key scan input 3
Pin55: Key scan input 2
Pin56: Key scan input 1
Pin57: OSD (On Screen Display) banking output
Pin58: Not used
Pin59: OSD blue output
Pin60: OSD green output
Pin61: OSD red output
Pin62: Vertical synchronisation pulse input for OSD
Pin63: Horizontal synchronisation pulse input for OSD
Pin64: Power supply (+5V)
3. DAC (IC809) Pin Description d
Pinl: Power supply (+5V)
Pin2: Data input from CPU (Pin26)
Pin3: Clock input from CPU (Pin25)
Pin4: Load input from CPU (Pin23)
Pin5: Surround ON/OFF output
H: Surround ON
Pin6: Not used
Pin7: SIF System(M) output
Pin8: Ground
Pin9: SIF System (1)output
Pinl O:SIF System (B/G, D/K) output
AUTO BIG D/K INTSC4.43
Pin 7LHLH H
Pin 9L L HLL
Pinl OL L HH H -.-’
Pinl 1: Volume output
Pinl 2: Surround level output
Pinl 3: Balance output
Pin14: Treble output
Pinl 5: Bass output
Pinl 6: Power supply (+5V)
.
–3–

Block Diagram
IC201 (TDA91 60) u~rrl
:“ $om
Vertical drive A
Vertical drive B
S-VHS
input
S-VHS SEPARATOR
input
output
H!End
III
cHlwEI-
lDENTlFl-
CATION
t11 Cl=oll kA .,.;,..- .,.-
—IiIU1-”ri, ”, ,=, =, rlecollnlino
B-Y chronlinan~e
4Filter reference
t1I
l++ Xdecoupling
PALINTSC
PLL DEMODU-
LATOR
I1 1 1 II
wJPwf=’w,i.94+El P
Digital
Block Diagram
IC202 (TDA4661 )
I I
Co Iour-difference Addition output Colour-difference
input signals Pre-amplifiere stages buffers output signals
Vp1
Sand castle
pulse input
–4–

Block Diagram
IC203 (TDA4685) Hue control
voltage
A
—
A45.A40, Aee.Aeo, AS5 Am A
-lJ5xc3J-----------------------”--- -....................
...............................,
N35AEQ,A15.A10,A25.A20,A3?.A20
.............................. c
4Leakage and
;BREN
VFB
Sandcastle
pulse
;NMEN
IdwEF+-
1
-(R-Y)+
EN!EDEl ‘;”’
-1111- I
.—
m
SUPPLY
G2 -I JI
------- 12Cbusdata and VFI=8V
control signals C*anem
A
Block Diagram
El
+
IC301 (C)(AI 420P)
,Im: %&f’ E
‘t input
S/M
+r
x
L
AAl T6
b“---- ,
CONTROL A
CHROMA DELAY
CDELAY
m.’ ,“:-’”’/
ONJOFF
12C BUS IF REGULATOR IREF AIT DELAY AMP y
;
125315 23 24 46
.n -- !H-
PLUSE
SHAPE
78
)Y-output
SDA SCLJVCC J
+- Cinpu’
coutput Blanking Clamp pulse/
Digital Analogue pulse
ground sand castle puIse ground Tx
–5–

Service control adjustments
*SAFETY PRECAUTIONS :An isolation transformer should be connected in the power line between the receiver and the AC
line before any service is performed on the receiver,
X-RADIATION PRECAUTlON The primary source of X-RADIATION in television receiver is the picture tube. The picture
tube is specially constructed to limit X-RADIATION emission. 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 maintain within specified limit. Refer to this service manual for specific high
voltage limits. 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.
:
(1) Receive the PAL colour bar pattern. (1) Receive the monochrome circular pattern.
“. (2) Setthe brightness and contrast to normal.
. . [I I II~3j Vertical ce;tering can be adjusted by switching SW501 on
111111111
cd the POWER &DEF PCB ASS’Y. -
‘-----
I1
(2) Connect the oscillator to Q133 -Emitter on the MAIN PCB [#
ASS’Y.
(3) Adjust VR131 for 1.OVP- pas shown below.
rl~
3
0
0
,.
w’
Video det.
waveform 1,Ovp-p
r
o❑
☞
VIDEO
DET. ADJ.
~Q133
\Emitter
uMAIN PCB ASS’Y
(1) Receive the monochrome circular pattern.
(2) Set the brightness to normal and contrast to maximum.
o
00 C501
VERT,
OUT
oSW501
~-ru
●Cal
UP —DOWI
:0 \
NEUT i
●
13111 0VERTICAL
CENTER -ADJ.
o
00
POWER &DEF. PCB ASS’Y
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to normal.
(3) Adjust VR2301 on the SYNC SUB PCB ASS’Y for optimum
horizontal center position,
~Horizontal center
(1) Connect the high voltage probe(+) to the anode lead of the
picture tube and the ground.
(2) Receive the monochrome circular pattern,
(3) Adjust the focus control on the F.B.T for the best focus on (3) Set the brightness and contrast to minimum.
the screen center. (4) The high voltage must be less than 25’’=3OKV, 29’’=32.5
KV.
–6 – Note: If the picture tube is replaced, check the high voltage.

Tuner assembly adjustments
The following components of Tuner Assembly (645 000 1192) can be ordered separately: .
Tuner Ass’y (6450001192)
Ref. No. IPart No. Descri~tion
Al OIA 6450001208 UV Varactor Tuner
Al 01 B6450005312 IF Pack
●When you order these components together as the Tuner Assembly, they do not need to be adjusted.
●Since each components is pre -adjusted at the time of shipment, it does not usually require further adjustment, even when
purchased separately. However, if there is any such need, you can follow the instructions below to perform the adjustment.
AGC Adjustment
Note: Do not attempt this adjustment with the weak signal.
(1) Tune the receiver to the most clearest (or strongest) VHF station in your area.
Set the brightness and the contrast to maximum.
Set the colour to minimum.
(2) Turn the AGC control (SVR1 01) of the IF Pack in direction which causes the snow to smears, then in ouuosite direction
until the snow just disappears.
Q202
), COLOUR, @
2CTION
n
L
Y
-
u
L
Y
—
o
0
-DL
00
oQ1
4-
Q1
+
DQ133
%AGC Adjustment
~MAIN UNIT
–7–

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 unit supplied with the set.
Memory IC (lC805)replacement
Since adjustment data for the circuit is stored in the memory IC (IC805) 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 ofthe servicemode.
To enter service mode, press and hold down the MEMORY key on the front control panel of the TV set, then press the remote
control Normalization key.
“.
T(Front control)
‘MEMORY key
(2) Screen displayinthe servicemode.
–Screen display –
I
,.
,.
adjustments
See the next page for adjustment items and data.
(3) Reset ofthe servicemode.
(Remote Control Transmitter)
og. UP/DOWN
EVEL
.Item of the adjustments can be selected by
pressing Prog; UP/DOWN (Y P A )key of the
remote control unit.
.Adjustments data can be set by pressing LEVEL
(-~ +) key of the remote control unit.
Normalization
.- To exit from the service mode, turn off the TV set by pressing the Power ON/OFF button of the TV set or the remote control
transmitter.
–8–

Adjustments in the Service mode
The displayed data is not post adjustment data, but initial reference data from the CPU ROM for basic set operation
following memory IC replacement. Perform individual adjustments according to the circuit adjustment method described
earlier when the memory IC is replaced.
–Table of the adjustments –
Screen Display IAdjustments Rikl “%2’”1
Remarks
1III I
01.v-s Vertical Shift Adjustment 31 1 31 00 – 63 Not used
02.V-A VerticalSizeAdjustment 34 34 00 – 63
03.v-L VerticalLinearityAdjustment 31 31 00 – 63
~04.s-c S- CorrectionAdjustment I31 I31 I00 – 63 I
05. H-S Horizontal Center Adjustment 00 00 00 – 63 Not used
06. H-W Horizontal Width Adjustment 37 38 00 – 63
07. P-w PincushionAdjustment (Parabolawidth) 28 30 00 – 63
08.C-P PincushionAdjustment (Cornerparabola) 31 25 00 – 63
.x 09. TRP Pincushion Adjustment 25 I20 00 – 63
10.RRedGainAdjustment 24 00 – 63
11.GGreen Gain Adjustment 24 00 – 63
12. BBlue Gain Adjustment 24 00 – 63
~13. P-L Peak Drive Limit Adjustment 45 00 – 63
~14. S-L Slice Adjustment 10 00 – 63
~15. S-F Sharpness Focus Adjustment 20 00 – 63
~16. W-H Weighting Adjustment 21 00 – 63 ,
17. C-D Chroma Delay Adjustment 31 00 – 63 Not used
18. OSD On Screen Display Center Adj. 700 – 63
Note: In the event that separate data adjustments are required, such as for PAL and NTSC systems, perform individual
adjustments for PAL and NTSC signal reception.
Adjust for NTSC by inputting the NTSC signal from the AV input terminal.
(1) Connect the oscilloscope to TP -47G and the ground(TE-
47) of the CRT PCB ASS’Y.
(2) Receive the PAL colour bar pattern.
(Set the colour control to minimum and the contrast to
maximum.)
IGrey I
(3) Adjust the brightness control volume to be a=l OV t; V.
(4)
(5)
(6) Ti-
a
Tb
Set the TV receiver to the service mode.
Select”1 1. G“ by pressing Prog. UP/DOWN key.
Adjust so that b=85 Vf3V by pressing LEVEL (- ~ + )key.
Note: This adjustment should be done after sub contrast
adjustment. .
(1) Receive the PAL monochrome circular pattern.
(Set the colour and brightness control to normal and the
contrast to maximum.)
(2) Set the TV receiver to the service mode.
(3) Select”1 O. R“ by pressing Prog. UP/DOWN key, and adjust
so that the red gain is optimum level by pressing LEVEL (-
-+)key.
(4) Select”1 2, B“ by pressing Prog. UP/DOWN key, and adjust
so that the blue gain is optimum level by pressing LEVEL
(-~ +)key.
(1) Receive the monochrome circular pattern.
(Set the brightness to normal and contrast to maximum,)
(2) Set the TV receiver to the service mode.
(3) Select “02. V-A by pressing Prog. UP/DOWN key of the
remote control unit.
(4) Adjust the vertical size by pressing LEVEL (- ~ + )key.
–9-