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AKAI SERVICE MANUAL
25" / 29"
SOLID STATE
Color Television
Receiver
( PAL / SECAM VERSION )
MITSUBISHI I2C IC
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.
Document : ___________
SM-37PM Date : 12-11-2001 Approved by :
Checked by :
(Zeng Shui Hua )
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SPECIFICATION
SUPPLY VOLTAGE : AC220V 50Hz > + 10% / -20%
PAL - SECAM - PAL - SECAM -
SYSTEM : PAL - I / I PAL - BG PAL - I BG / DK BG / DK PAL - BG PAL - BG SECAM - L L'
(UK) ( HYPER ) ( HYPER ) ( CATV )
CHANNEL L - VHF : 2-4 1-5 1-5 E2 - S10 E2 - S2 FB - FC CH
H - VHF : 4 - 13 5 -12 6 - 12 6 - 12 E5 - S41 E5 - S20 1-Q CH
UHF : 21 - 69 21 - 69 21 -69 21 - 69 21 - 69 E21 - E69 E21 - E69 21 - 69 CH
VIF FREQUENCY : 38.9 38.9 39.5 38.0 38.9 38.9 38.9 38.9 32.7 MHz
SIF FREQUENCY : 32.9 33.4 33.5 31.5 32.5 32.4 33.4 33.4 33.4 32.4 39.2 MHz
CHROMA IF FREQUENCY : 34.47 34.47 35.07 33.57 33.57 34.47 34.47 34.47 34.47 34.47 MHz
INTER-CARRIER FREQUENCY : 6.0 5.5 6 6.5 5.5 5.5 6.5 5.5 5.5 6.5 6.5 MHz
SCANNING HORIZONTAL : 15625 LINE
VERTICAL : 50 Hz
ANTENNA INPUT IMPEDANCE : 75 OHM
CRT : 25" 29"
SM-37PM P. 1
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ITEMS OF MEASUREMENT STANDARD UNIT
VIDEO SENS. AT S/N 30db L - VHF < 57 dbuv
H - VHF < 57 dbuv
UHF < 60 dbuv
SOUND SENS. AT S/N 30db L - VHF < 42 dbuv
H - VHF < 42 dbuv
UHF < 48 dbuv
AGC CHARACTER > 60 db
SELECTIVITY -1.5 MHz > 35 db
+ 8 MHz > 40 db
COLOR SENS. < 45 dbuv
COLOR LOCK - IN RANGE > +300 Hz
VERTICAL LOCK - IN RANGE >6 Hz
HORIZONTAL LOCK - IN RANGE > 400 Hz
MAX BRIGHTNESS > 100 cd/m2
MAX OUTPUT POWER > 4.5 W
OUTPUT POWER AT 10% THD > 3.5 W
BUZZ < -40 db
AFC RANGE > +1 MHz
> -0.5 MHz
MIN. VOL HUM < 20 mV
RESOLUTION HORIZONTAL > 300 LINES
VERTICAL > 400 LINES
LINEARITY DISTORTION VERTICAL < 10 %
HORIZONTAL < 10 %
RASTER DISTORTION <5 %
REMOTE CONTROL DISTANCE >5 METER
ANGLE > +15 DEGREE
POWER CONSUMPTION ( AT NORMAL CONDITION ) < 120 WATTS
POWER CONSUMPTION ( AT MAX. CONDITION ) < 150 WATTS
CONVERGENCE DISLOCATION AT AREA "A" < 0.4 %
AREA "B" < 0.8 %
( see fig.1 )
H
A B
VIDEO INPUT LEVEL : 1.0V P-P + 3dB
AUDIO INPUT LEVEL : 0.5V RMS + 3dB Fig.1
SM-37PM P. 2
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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 6. High Voltage Meter
2. DC Power Supply 7. Ampere Meter ( 0.5 Class, DC 3mA Max )
3. Oscilloscope 8. Demagentizing Coil
4. Vacuum Tube Voltmeter 9. Philips Pattern Generator
5. Volt Ohmmeter 10. High Pot Tester
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 )
SM-37PM P. 3
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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% )
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 )
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.
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)
SM-37PM P. 4
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2.5V+/-0.25V
(DC)
OV (DC)
fig.7
SM-37PM P. 5
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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.
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.
CONDITION TEST STANDARD
TEST STANDARD
SAFETY STD. FOR PRODUCTION
VDE, SAA 3.0KV 10mA / 1MIN >3.5 KV <10mA / >10 SEC.
BS 4.0KV 10mA / 1MIN >4.0 KV <10mA / >10 SEC.
CHINA STANDARD 3.0KV 10mA / 1MIN >3.3 KV < 5mA / > 6 SEC.
UL 1.0KV 5mA / 1MIN >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
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CENTRE (mm) SCANNING
SCANNING
DISTRICT LIMIT (mm) SIZE
POSITION SIZE (%)
LIMIT (%)
THAILAND -1 0 ~ -2 90 88 ~ 92
FRANCE +3 0 ~ +5 90 88 ~ 94
GERMANY +3 0 ~ +5 90 90 ~ 95
*GROUP A -2 -5 ~ -1 90 88 ~ 94
*GROUP B 0 -2 ~ +2 90 88 ~ 94
*GROUP C +3 0 ~ +5 90 88 ~ 94
mm -5 -4 -3 -2 -1 0 1 2 3 4 5 mm
LEFT CRT MUST RIGHT
FACE TO EAST
CENTRE OF
THE SCREEN
FIG. 8
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.
SM-37PM P. 7
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FACTORY MODE TABLE 1
REF
ITEM REMARK
VALUE
O = TV Status
1 POWER S = Power Status
P P = Last power status
1=PAL/NTSC.W/O EW 3=PAL/NTSC.W/EW
2 TDA884X 3 2=PAL/SECAM/NTSC.W/O EW 4=PAL/SECAN/NTSC,W/EW
1 = DK/I 4 = BG/DK/I/M
3 S.SYS 6 2 = BG/DK 5=I
3 = DK/I/M 6 = BG
1 = NIL 1 = NIL
CHINA 2 = ROWA
4 LOGO 1 TEAC 2 = TEAC 3 = CAIXIING
3 = HAIER 4 = HAIER
0 = OFF
5 CT1 0 1 = ON
OSD. 0 = NO BACKGAN 1 = W/BACKGAN
6 ANTENNE 0 0 = OFF ANTENNE 1 = ON ANTENNE
LANGUAGE 0 = ENG 1 = RUSSIAN
0 = OFF
7 WOOFER 0
1 = ON
TUNE 0 = NO POWER ON AUTO TUNER 1 = POWER ON AUTO TUNER
8 0
TEXT 0 = OFF TEXT 1 = ON TEXT
BLUE EX 0 = OFF BLUE EX 1 = ON BLUE EX
9 0
LANGUAGE 0 = ENGLISH ONLY 1 = CHINESE/ENGLISH
1 = TV/AV1/AV2/AV3/S-VHS
10 AV NO 1 2 = TV/AV1/AV2/S-VHS
3 = TV/AV1/AV2
16:9 0 = OFF 16:9 1 = ON 16:9
11 KARAOKE 0 0 = OFF KARAOKE 1 = ON KARAOKE
DVDTX Set 0 = OFF DVD 1 = ON DVD
0 = OFF
12 BBE 0
1 = ON
0 = Picture
13 HALF SCR 0
1 = HACF Picture
SM-37PM P. 8
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FACTORY MODE TABLE 2
VALUE REF
ITEM ADJUST REMARK
RANGE VALUE
co-ff dd For CTI ON TV set Adjustment
1 H-SHIFT 80-Bf a3 For CTI OFF TV set Adjustment
2 V-SLOPE 0-3f 2b For TV set Adjustment
3 V-AMPL 40-80 55 For TV set Adjustment
4 S-CORRECT10N 80-Bf 90 For TV set Adjustment
5 V-SHIFT 0-3f 1e For TV set Adjustment
6 EW-WIDTH 0-3f 36 For TV set Adjustment
7 EW-PAR 0-3f 16 For TV set Adjustment
8 EW-CORNER 0-3f 0 For TV set Adjustment
9 EW-TRAP 0-3f 2a For TV set Adjustment
10 CONTROL 0 3 NON-Adjustable Value
11 CONTROL 1 90 NON-Adjustable Value
0-3f (TEAC)
12 AGC
40-7f (CHINA) 12 For TV set Adjustment
For TV Set IF Frequency
13 PLL 40 = 38.90 MHz 80 = 33.40 MHz
40
60 = 38.00 MHz CI = 33.90 MHz
SM-37PM P. 9
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FACTORY MODE TABLE 3
VALUE
ITEM REF REMARK
ADJUST
VALUE
RANGE
DVD1 0-FF 38
1 18 NON-Adjustable value
CONTROL 2
DVD2 0-FF bb
2 25"set 12 NON-Adjustable value
CONTROL 3 29"set 14
DVD3 0-FF a3 CTI ON Set 9
3 e9 CTI OFF Set e9
CONTROL 4
0 = OFF
4 HOTEL LOCK 0 1 = ON
5 SaB SHP 00-31 00 Sab shp seting
1 = COMB ON
6 COMB 1 0 = COMB OFF
0 = NICAM/G.ST 2 = G.ST
7 NICAM 1 1 = NICAM
0 = OFF CCD
8 CCD 0 1 = ON CCD
SM-37PM P. 10
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FACTORY MODE TABLE 4
VALUE REF
ITEM ADJUST REMARK
RANGE VALUE
1 PT R 0-3f 22 For TV Set Adjustment
2 PT G 0-3f 22 For TV Set Adjustment
3 PT B 0-3f 22 For TV Set Adjustment
WHITE BAL 0 = Picture
4 0
1 = H-LINE
5 SUB BRI 00-31 18 SUb bri Setting
SM-37PM P. 11
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TR B.V C.V E.V
LOCATION
Q101 0.7 0 1.6
Q102 4.9 0.3 4.9
Q103 4.9 0.15 4.9
Q104 4.3 4.9 4.9
Q105 3.2 0 3.2
Q106 2.4 7.9 1.7
Q108 2.8 6.7 2.1
Q109 1 7 0.3
Q110 0.7 0 1.4
Q111 7.7 0 7.9
Q113 4.3 4.8 4.9
Q114 4.9 4.9 4.6
Q115 0 4.9 0
Q116 4.8 0 4.9
Q117 0.7 0.5 0
Q118 0 8.1 0
Q119 0.6 0 0
Q301 2.8 2.8 2.8
Q401 13.6 0 14.3
Q402 0.6 13.8 0
Q403 0 115 0
Q404 0.4 76 0
Q405 21.6 21 21
Q701 0 10 0
Q909 -2.35 293 0
Q910 0 8.6 0
Q911 10.2 0 1.3
Q912 8.9 14 8.2
Q913 15.3 15.3 14.6
Q914 14.7 15.3 15.3
SM-37PM P. 12
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SYMBOL IC102/V IC103/V IC104/V IC105/V IC106/V IC107/V
PIN NO IC101/V
1 NC 0.7 GND 0 5 GND NC
2 NC 0.7 NC 0 5 GND NC
3 NC 0 GND 0 5 GND GND
4 NC 0 GND 0 5 GND 4.2
5 2.6 4.7 4.8 0 5 5 4.2
6 2.1 0 4.8 0 5 5 GND
7 4.3 0.3 4.8 0 5 5 3.9
8 4.3 NC 4.5 0 5 5 2.6
9 6.6 NC 0 GND 0
10 1.1 4.5 0 GND 2.3
11 3.7 NC 0 GND 2.3
12 7.8 NC 0 GND 2.3
13 3.5 NC 0 GND GND
14 GND 4.7 0 5 GND
15 NC NC 0 5 4.9
16 3.9 4.1 0 5 4.9
17 3.3 0 0 GND GND
18 6.5 GND 0 GND 1.9
19 3.1 2.2 0 GND 1.9
20 2.7 1.8 5 5 NC
21 2.5 GND GND NC
22 3.6 4.8 GND NC
23 3.5 3.5 2.4 NC
24 3.5 3.5 GND NC
25 3.5 4.6 2.1 NC
26 0.2 NC 2.5 NC
27 2.1 NC 0 NC
28 2.1 NC GND GND
29 2.4 4.7 NC 2.3
30 2.4 4.7 5 GND
31 2.4 4.3 2.5 2.3
32 2.4 4.3 0 2.3
33 4.2 4.7 0 NC
34 2.5 4.3 0 NC
35 2.5 NC 0 GND
36 4.3 NC 0.8 NC
37 7.9 4.7 0.8 NC
38 1.9 0 5 4.4
39 4.9 0 5 4.4
40 0.3 0 GND GND
41 0.7 0 2.4 GND
42 4 0 2.7 GND
43 3.8 0 GND
44 GND 5 GND
45 0.5 GND GND
46 2.4 GND 2.2
47 2.6 GND 2.3
48 4.6 GND 2.3
49 4.6 4.3 GND
50 2.2 4.3 GND
51 3.8 5 NC
52 3.8 5 NC
53 3.4 2.4
54 4.6 2.4
55 2.9 2.4
56 3.7 0
57 NC
58 NC
59 4.8
60 2.3
61 2.3
62 2.4
63 2.4
64 4.9
SM-37PM P. 13
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SYMBOL IC109/V IC301/V IC401/V IC402/V IC403/V IC404/V
PIN NO IC108/V
1 10.5 1.8 0 0.7 14.6 13.7 11.8
2 15.4 2.1 0 8.3 GND GND GND
3 10.5 2.5 0 11.5 8 5 5
4 10.4 1.8 4.8 15.6
5 GND 1.8 0.7 8.1
6 10.4 1.9 GND GND
7 21 1.9 2 44
8 10.5 1.8 1.6 GND
9 10.5 1.8 1 8.4
10 3.9 1.2 15.6
11 3.9 GND 1.2
12 3 4.8 1.2
13 NC 1 7
14 2.8 4.2
15 1.8 4.2
16 2.8 1
17 NC 0
18 GND 0
19 4.9
20 1.8
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
SM-37PM P. 14
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SYMBOL IC501/V IC01/V IC701/V
PIN NO
1 3.2 7.5 2.9
2 3.3 3.8 0
3 3.1 NC 2.9
4 GND NC 2.9
5 6.4 NC 2.9
6 196 5.7 2.9
7 91 5.7 2.9
8 82 5.7 2.9
9 88 5.7 2.9
10 5.7 2.9
11 5.7 0
12 GND 0
13 5.7 0
14 5.7 0
15 5.7 3
16 5.7 2.9
17 10 1.
18 10 47
19 GND 0
20 4.2 0
21 4.2 0
22 10
23 10
24 5.7
25 5.7
26 NC
27 5.7
28 NC
29 10
30 4.3
31 4.5
32 4.3
33 4.5
34 NC
35 NC
36 NC
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
SM-37PM P. 15
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C .R .T.
T 402
F.B .T.
D E G A U S S IN G
C O IL
1 1 4
2 D E F L E C T IO N Y C K E
TO CN 401
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TO CN 903
T O C N 5 01
C N 904 PO W ER
C N903 PCB AV P C B
C RT B O A R D
C N 905
S CR E E N C RT
SO CKET
1 3
1 3 C N 5 01
TO CN 403
T O C N 40 2 M A IN P.C .B F
TO CN 105 T O C N 11 2 T O C N 1 0 4