Akai 25" / 29" SOLID STATE Color Television... User manual

AKAI SERVICE MANUAL
25" / 29"
SOLID STATE
Color Television
Receiver
This manual is the latest at the time of printing, and does not include the modification
which may be made after the printing, by the constant improvment of product.
Checked by :
Document : ___________
( PAL / SECAM VERSION )
MITSUBISHI I2C IC
Approved by :
Date :
SM-37PM
(Zeng Shui Hua )
12-11-2001

SUPPLY VOLTAGE : AC220V 50Hz > + 10% / -20%
SPECIFICATION
SYSTEM :
CHANNEL L - VHF :
H - VHF :
UHF :
VIF FREQUENCY :
SIF FREQUENCY :
CHROMA IF FREQUENCY :
INTER-CARRIER FREQUENCY :
SCANNING HORIZONTAL :
VERTICAL :
ANTENNA INPUT IMPEDANCE :
CRT :
PAL - BG
2 - 4
5 -12
21 - 69
38.9
33.4
34.47
5.5
PAL - I
(UK)
21 -69
39.5
33.5
35.07
6
PAL - SECAM -
BG / DK
( HYPER )
1 - 5
6 - 12
21 - 69
38.9
32.4 33.4
34.47 34.47
5.5 6.5
PAL - BG
( CATV )
E2 - S2
E5 - S20
E21 - E69
38.9
33.4
34.47
5.5
PAL - I / I
4 - 13
21 - 69
38.9
32.9
34.47
6.0
PAL - SECAM -
BG / DK
1 - 5
6 - 12
21 - 69
38.0
31.5 32.5
33.57 33.57
6.5 5.5
PAL - BG
( HYPER )
E2 - S10
E5 - S41
E21 - E69
38.9
33.4
34.47
5.5
L'
FB - FC
32.7
39.2
6.5
CH
CH
CH
MHz
MHz
MHz
MHz
15625 LINE
50 Hz
75 OHM
25" 29"
SECAM - L
1 - Q
21 - 69
38.9
32.4
34.47
6.5
SM-37PM P. 1

ITEMS OF MEASUREMENT
VIDEO SENS. AT S/N 30db
SOUND SENS. AT S/N 30db
AGC CHARACTER
SELECTIVITY -1.5 MHz
+ 8 MHz
COLOR SENS.
COLOR LOCK - IN RANGE
VERTICAL LOCK - IN RANGE
HORIZONTAL LOCK - IN RANGE
MAX BRIGHTNESS
MAX OUTPUT POWER
OUTPUT POWER AT 10% THD
BUZZ
AFC RANGE
MIN. VOL HUM
RESOLUTION HORIZONTAL
VERTICAL
LINEARITY DISTORTION VERTICAL
HORIZONTAL
RASTER DISTORTION
REMOTE CONTROL DISTANCE
ANGLE
POWER CONSUMPTION ( AT NORMAL CONDITION )
POWER CONSUMPTION ( AT MAX. CONDITION )
CONVERGENCE DISLOCATION AT AREA "A"
AREA "B"
( see fig.1 )
VIDEO INPUT LEVEL : 1.0V P-P + 3dB
AUDIO INPUT LEVEL : 0.5V RMS + 3dB
L - VHF
H - VHF
UHF
H
B
A
Fig.1
STANDARD
< 57
< 57
< 60
< 42
< 42
< 48
> 60
> 35
> 40
< 45
> +300
> 6
> 400
> 100
> 4.5
> 3.5
< -40
> +1
> -0.5
< 20
> 300
> 400
< 10
< 10
< 5
> 5
> +15
< 120
< 150
< 0.4
< 0.8
UNIT
dbuv
dbuv
dbuv
dbuv
dbuv
dbuv
db
db
db
dbuv
Hz
Hz
Hz
cd/m2
W
W
db
MHz
MHz
mV
LINES
LINES
%
%
%
METER
DEGREE
WATTS
WATTS
%
%
L - VHF
H - VHF
UHF
SM-37PM P. 2

ALIGNMENT INSTRUCTION
I. PLEASE READ BEFORE ATTEMPTING SERVICE
1. Never disconnect any leads while receiver is in operation.
2. Disconnect all power before attempting any repairs.
3. Do not short any portion of the circuit while power is on.
4. For safety reasons, all parts replaced should be identical, ( for parts and part numbers see parts list ).
5. Before alignment the set must be pre-heated for 30 minutes or more and erase magnetism thoroughly
from CRT front chassis frame by erase coil. ( Except IF, SYNC, COLOR, SECAM, B+, SOUND )
II. TEST EQUIPMENT
1. Colour Bar, Dot, Cross Hatch Generator
2. DC Power Supply
3. Oscilloscope
4. Vacuum Tube Voltmeter
III. FACTORY ADJUSTMENT : See table 1- 4
1. Press REMOTE FACTORY ON button.
2. Press REMOTE FACTORY button.
3. Press REMOTE UP or DOWN button select item.
4. Press REMOTE value (+) (-) button,adjust the value.
5. REMOTE DIALOG CENTRE button can turn off factory mode function.
REMARK : NO this factory on Normal remote control .
IV.B+ ADJUSTMENT
1. Connect a digital voltmeter between the W234 and Ground.
2. Press REMOTE Picture button.
3. Press REMOTE UP/DOWN and value (-) button set Brigntness,contrast,color to minimum.
4. Adjust Screen Volume on FBT Until the picture can just been seen.
5. Adjust VR901 and obtain a reading of 143V +1V (DC).
V.AGC ALIGNMENT
1. Receive CH69 ( UHF ) and input field strength. (60dB in put signal)
2. Connect a digital voltmeter between the TUNER AGC TERMINAL and Ground.
3. Press REMOTE AGC button.
4. Press REMOTE value (+) (-) button adjust value to (0) and then adjust AGC take over value
obtain drop down 0.4V. (DC)
REMARK : ( 1/ The drop down voltage should be more than and tends to 0.4V )
( 2/ No observable noise can be seen )
6. High Voltage Meter
7. Ampere Meter ( 0.5 Class, DC 3mA Max )
8. Demagentizing Coil
9. Philips Pattern Generator
10. High Pot Tester
5. Volt Ohmmeter
SM-37PM P. 3

VIII. HORIZONTAL SHIFT ADJUSTMENT
1. Receive Monoscope Pattern input signal 70dB +10dB.
2. Press REMOTE H-shirt button.
3. Press REMOTE value (+) (-) button adjust value to obtain the picture at center +2mm.
( Specification show in Fig.8 )
VI. SOUND TRACKING ALIGNMENT
1. Receive a gray scale pattern.
2. Connect a oscilloscope and monitor IC109 TDA3857 PIN 15 and Ground.
3. Adjust T101 to obtain the waveform Fig.6.
4. Conect a Voltage meten and monitor IC 104 TDA9801 PIN 15 and gorund.
5. Adjust T101 obtain 5V+0.1V (DC).
Fig.6
Remark: All frequency of Marker points are +0.2% tolerance.
VII. EAST - WEST CORR ECTION ADJUSTMENT
1) Receive a crosshatch and center cross pattem.
2) Set the Brightness,contrast to middle position.
3) Press REMOTE EW-Par/wid,EW-trap button,Press REMOTE VALUE (+) (-) button adjust Value
to normal regular picture.
4) Press REMOTE WE-width button,Press REMOTE value (+) (-) button adjust value to proper horizontal
width ( 90% + 2% )
X. VERTICAL AMPL ADJUSTMENT
1. Receive the Monoscope Pattern.
2. Press REMOTE V-ampl button.
3. Press REMOTE value (+) (-) button adjust value to obtain a normal picture.
XI. WHITE BALANCE ALIGNMENT STEP
( Degauss the picture by degaussing coil if necessary )
1. Receive a grey scale pattern
2. Connect a oscilloscope and monitor CN101 pin"3"and ground.
3. Press REMOTE picture button.
4. Press REMOTE UP/DOWN and value (-) button set the brightness,contrast,
to middle position.
5. Ajust screen volume on FBT unitl the waveform to 2.5V+/-0.25V DC see fig.7.
6. Press REMOTE sub bri button.
7. Press REMOTE value (+) (-) button adjust value to (18).
8. Receive a black and white pattern
9. Press REMOTE with bal button.
10. Press REMOTE UP/Down and value (+) (-) button adjust blue str value to(0).
11. Press REMOTE picture button.
12. Press REMOTE UP/Down and Value(+) (-) button set the brightness and color to minimun position.
contrast to MAX position.
13. Press REMOTE pt r.g.b.button.
14. Press REMOTE UP/Down and value (+) (-) button adjust the white balance.(9300o k)
IX. VERTICAL LINEARTY ADJUSTMENT
1) Receive a crosshatch and center cross pattem.
2) Set the Brightness,contrast to middle position.
3) Press REMOTE V-SIope,S-Correction button,Press REMOTE Value (+) (-) button adjust value to normal
regular picture.
4) Press REMOTE V-Shift button,Press REMOTE Value (+) (-) button adjust value to obtain the picture at center.
SM-37PM P. 4

OV (DC)
2.5V+/-0.25V
(DC)
fig.7
SM-37PM P. 5

XIII.FOCUS ALIGNMENT
1) Set the Brightness and Contrast to middle position.
2) Receive a monoscope pattern.
3) Adjust focus control to obtain sharpest picture.
XIV. HIGH POT TESTING
1) Short the L - pole and N - pole of AC line cord.
2) Switch on the power switch of the TV Set.
3) Connect The High Pot Tester ( - ) to L and N pole, ( + ) to the METAL PART of CABINET.
XII.SUB - BRIGHTNESS ALIGNMENT
1. Receive a grey scale pattern.
2. Press REMOTE picture button,.
3. Press REMOTE UP/DOWN and value (-) button set
the brightness, contrast to minimun.
4. Press REMOTE sub bright button.
5. Press REMOTE value (+) (-) button adjust value to
brightness bar can just be seen.
TEST STANDARD
CONDITION
SAFETY STD. TEST STANDARD
FOR PRODUCTION
VDE, SAA
BS
CHINA STANDARD
UL
3.0KV 10mA / 1MIN
4.0KV 10mA / 1MIN
3.0KV 10mA / 1MIN
1.0KV 5mA / 1MIN
>3.5 KV <10mA / >10 SEC.
>4.0 KV <10mA / >10 SEC.
>3.3 KV < 5mA / > 6 SEC.
>1.25KV < 5mA / > 1 SEC.
Remark:
1) If no other specify, the strength of input signal should be 70dB +10dB.
2) The High Pot Tester can have < +5% tolerance.
SM-37PM P. 6

DISTRICT CENTRE (mm)
POSITION LIMIT (mm) SCANNING
SIZE (%)
SCANNING
SIZE
LIMIT (%)
THAILAND
FRANCE
GERMANY
*GROUP A
*GROUP B
*GROUP C
-1
+3
+3
-2
0
+3
0 ~ -2
0 ~ +5
0 ~ +5
-5 ~ -1
-2 ~ +2
0 ~ +5
90
90
90
90
90
90
88 ~ 92
88 ~ 94
90 ~ 95
88 ~ 94
88 ~ 94
88 ~ 94
mm -5 -4 -3 -2 -1 0 1 2 3 4 5 mm
LEFT RIGHT
CENTRE OF
THE SCREEN
CRT MUST
FACE TO EAST
REMARK : 1. SUITABLE FOR 14" OR ABOVE TV.
2. Adjust the centre position must take the upper side of monoscope
pattern for standard.
3. Group A : AUSTRALIA, NEW ZEALAND, TAHITI.
4. Group B : HONG KONG, CHINA, AMERICA, CANADA, MALAYSIA,
MEXICO.
5. Group C : ENGLAND, ITALY, GERMANY, RUSSIA, SWITZERLAND,
JUGOSLAVIA, SPANISH.
If the above countries are not include, please consult to
Engineering Dept.
FIG. 8
SM-37PM P. 7

1
2
3
4
5
6
7
8
9
10
11
12
13
FACTORY MODE TABLE 1
ITEM REF
VALUE REMARK
P
3
6
1
0
0
0
0
0
1
0
0
0
POWER
TDA884X
S.SYS
LOGO
CT1
WOOFER
AV NO
BBE
HALF SCR
O = TV Status
S = Power Status
P = Last power status
1=PAL/NTSC.W/O EW 3=PAL/NTSC.W/EW
2=PAL/SECAM/NTSC.W/O EW 4=PAL/SECAN/NTSC,W/EW
1 = DK/I
2 = BG/DK
3 = DK/I/M
4 = BG/DK/I/M
5 = I
6 = BG
1 = NIL
TEAC 2 = TEAC
3 = HAIER
0 = OFF
1 = ON
0 = NO BACKGAN 1 = W/BACKGAN
0 = OFF ANTENNE 1 = ON ANTENNE
0 = ENG 1 = RUSSIAN
0 = OFF
1 = ON
0 = OFF BLUE EX 1 = ON BLUE EX
0 = ENGLISH ONLY 1 = CHINESE/ENGLISH
0 = OFF
1 = ON
0 = OFF KARAOKE
0 = OFF DVD
0 = Picture
1 = HACF Picture
0=NO POWER ON AUTO TUNER 1=POWERONAUTOTUNER
0 = OFF TEXT 1 = ON TEXT
1 = TV/AV1/AV2/AV3/S-VHS
2 = TV/AV1/AV2/S-VHS
3 = TV/AV1/AV2
OSD.
ANTENNE
LANGUAGE
TUNE
TEXT
BLUE EX
LANGUAGE
16:9
KARAOKE
DVDTX Set 1 = ON KARAOKE
1 = ON DVD
0 = OFF 16:9 1 = ON 16:9
1 = NIL
2 = ROWA
3 = CAIXIING
4 = HAIER
CHINA
SM-37PM P. 8

1
2
3
4
5
6
7
8
9
10
11
12
13
FACTORY MODE TABLE 2
ITEM REF
VALUE REMARK
a3
2b
55
90
1e
36
16
0
2a
3
90
12
40
H-SHIFT
V-SLOPE
V-AMPL
S-CORRECT10N
V-SHIFT
EW-WIDTH
EW-PAR
EW-CORNER
EW-TRAP
CONTROL 0
CONTROL 1
AGC
PLL
ADJUST
RANGE
80-Bf
0-3f
40-80
80-Bf
0-3f
0-3f
0-3f
0-3f
0-3f
VALUE
ForCTIOFFTVsetAdjustment
For TV set Adjustment
For TV set Adjustment
For TV set Adjustment
For TV set Adjustment
For TV set Adjustment
For TV set Adjustment
For TV set Adjustment
For TV set Adjustment
NON-AdjustableValue
NON-AdjustableValue
For TV set Adjustment
For TV Set IF Frequency
40 = 38.90 MHz 80 = 33.40 MHz
60 = 38.00 MHz CI = 33.90 MHz
co-ff dd For CTI ON TV set Adjustment
0-3f (TEAC)
40-7f (CHINA)
SM-37PM P. 9