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Akai
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CTD1390
Schematic
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Akai CTD1390 Schematic

SERVICE MANUAL
safety (Required by safety
regulations in some countries) the set should by
riginal condition and only parts
SYSTEM COLOUR TELEVISION
-------------------------------------------------------------------------------------------------------
SANYO I2C CHASSIS
NTSC PAL M/N
In the interests of user-
restored to its o identical to those specified should by used.
CONTENTS PAGE
l ELECTRICAL SPECIFICATIONS ……………………………………………………… 2 l IMPORTANT SERVICE NOTES ………………………………………………………… l DESCRIPTION OF NEW CIRCUIT ……………………………………………………… l SERVICE ADJUSTMENT ………………………………………………………………… l TROUBLE SHOOTING TABLE l CHASSIS LAYOUT DIAGRAM …………………………………………………………… l SCHEMATIC DIAGRAMS ………………………………………………………………… l REPLACEMENT PARTS LIST ……………………………………………………………
……………………………………………………………
WARNING
1
ELECTRICAL SPECIFICATIONS
a 10k ohm
nd
ray radiation is kept to an absolute minimum. Since certain
malfunctions or servicing may produce potentially hazardous. radiation with prolonged
When repairing the set in circuit, be sure not to increase the high voltage to more the
1.5KV
adjusted to the
Do not substitute a picture tube with unauthorized types and/or brands with may cause
networks, mechanical
insulators etc.
Aerial Input Impedance…………………………………………………………………… 750hm unbalanced Convergence…………………………………………………………………………… self-converging system Focus……………………………………………………………………… Electrostatic focus high bi-potential Audio Power Output Rating………………………………………………………………………… 3WX2 at max Picture IF.Freq.………………………………………………………………………… 45.75MHz Sound carrier Trap………………………………………………………………………… 41.25MHz Power Source…………………………………………………………………………… 110/220V AC 60HZ/50HZ Power Consumption……………………………………………………………………… 120W Speaker Size………………………………………………………………………… Round DynamicX2pcs. Sweep Deflection………………………………………………………………………………… Magnetic Tuning Ranges………………………………………………………………………… VHF-Channels 2-13
UHF-Channels 14-83
IMPORTANT SERVICE NOTES
Maintenance repair of this receiver should by done by qualified service
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
When serving the high voltage system , remove static charge from it by connecting Resistor in series with an insulated wire(such as a test probe)between picture tube tag and 2 anode lead.(AC line cord should be disconnected from AC outlet.) 1．Picture tube in this receiver employs integral implosion protection.
2．Replace with tube of the same type number for continued safety. 3．Do not lift picture tube by the neck. 4．Handle the picture tube only when wearing shatter-proof goggles and after discharging the high voltage completely.
X---RAY
This receiver is designed so that X---
exposure at close range, the following precautions should be observed: 1．
27.5kv,(at beam 0μA) for the set.
2． The keep the set in a normal operation, be sure not to mark it function on 23.5KV+
(at beam 1000μA)in the case of the set. The set has been factory-
above-mentioned high voltage. ∴ If there is a possibility that the high voltage-fluctuates as a result of the repairs, never forget to check for such high voltage after the work.. 3．
excess x-ray radiation.
BEFORE RETURING THE RECEIVER
Before returning the receiver to the user, perform the following safety checks. 1．Inspect all lead dress to mark
2．Inspect all protective devices such as non-metallic control knobs, insulating fish papers, cabinet backs, adjustment and compartment covers or shield, isolation resistor-capacity
2
DESCRIPTION OF NEW CIRCUIT
EXPLANATION OF REMOTE CONTROL IC OPERATION （A） LC863432C-5MOO（CPU ）/LC863432B-54C9 1-1 KEY CONT
PIN Range of Voltage KEY NAME FUNCTION
OV～3/32VDD OFF No press key 4/32 VDD-7/32 VDD AUTO Auto-Search 8/32 VDD-11/32 VDD TV/AV TV/AV Switching
KEYIN
Pin13
12/32 VDD-15/32 VDD MENU Menu key 16/32 VDD-19/32 VDD VOL+ Volume increase 20/32 VDD-23/32 VDD VOL- Volume reduce 24/32 VDD-27/32 VDD CH+ CH+ increase 28/32 VDD-VDD CH- CH- reduce
1-2 MAXIMAL PROGRAM
The pinning of LC8634328 is giver in the figure below and is based on LC8634328-5M00 microcomputer.
EEPORM MODEL AT24C08 Maximal Program 181
1-3 POWER CONTROL
PIN POWER ON POWER OFF
Pin23(POWER) 0 1
1-4 DVD CONTROL
PIN
Pin36(DVD) 0 1
1-5 AV CONTROL
a)、ONE AV INPUT
PIN TV AV
Pin34(AV1) Pin33(AV2) 0 1
b)、TWO AV INPUT
PIN TV AV1 AV2
Pin34(AV1) Pin33(AV2)
DVD OFF DVD ON
0 1
0 0 1 0 1 1
3
c)、THREE AV INPUT
YUV
SDA1
36
0
0
IN
NC
RESET
FILT
CVIN
BALNK2
SYNC
SYNC
3534333231302928272625242322212019
PIN TV AV1 AV2 AV3
Pin34(AV1) Pin33(AV2)
0 1 0 1 0 0 1 1
1-6 50/60 CONTROL OUTPUT
PIN 50 60
Pin35(50/60) 0 1
1-7 LC863432C Pin Connection(top view)
CLK1 SDA
CLK
VSS XT1
XT2
VDD
KEY-
AFT-IN
X-RAY
1 2
3 4 5
6
7 8
9 10 11 12
13
DVD ON/OFF DVD AV1 AV2
DEGAUSS
WOOF
VOLUME-
VOLUME-
REMOT
SD
ENABL MUTE
14 15
V-
H-
16 17
18
4
POWER
BLANK
BLUE GREEN
RED
1-8 CPU Pin Arrangement
18
NO factory display on screen when
Factory display on screen when
5
Screen display will be on at the upper
Screen display will be on at the
No control picture when horizontal
Control picture when horizontal
No.
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17
1.9 ITEM OF SETUP
PIN FUNTION No.
P10/SDA0 SDA1 19 R R OUT
P11/SCLK0 CLK1 20 G G OUT
P12/SDA1 SDA0 21 B B OUT
P13/PCLK1 CLK0 22 BL BLANK
VSS VSS 23 P31 POWER XT1 XTAL1 24 P32 MUTE XT2 XTAL2 25 P70/INTO ENABLE
VDD VDD 26 P71/INT1 YUV P04/AN4 KEY IN 27 P72/INT2 SD P05/AN5 AFT IN 28 P73/INT3 REMOTE P06/AN6 NC 29 P14/PWM1 VOL-R P07/AN7 X-RAY 30 P15/PWM2 VOL-L
RESET RESET 31 P16/PWM3 WOOF
FILT FILT 32 P17/PWM DEGAUSS
P33 33 P00 AV2 P30 34 P01 AV1
VS V-SYNC 35 P02 DVD TRIGGER(50/60) HS H-SYNC 36 P03 DVD OFF/ON
PIN FUNTION
1
OSD Display SET 0 STATE Set 1 ”STATE
2
POWER OPT
3
POWER FLAG
4 SEARCH CHECK NO SEARCH CHECK Search check when power on
SEARCH SPEED
6 7 CHANNEL MAX 8
9
10 11 BLACK BACK NO BLACK BACK BLACK BACK 12
13 AKB P.MODE 14 STEREO OPT
15 16 WOOF/H.PHONE 17 18 SIF 4.5M OPT 19 SIF 5.5M OPT
BAND OPT
AV OPT
POS. L/R
BLUE BACK NO BLUE BACK BLUE BACK
H-KILL OPT
STEREO IC
WOOF VOL.OPT
“0”： Enter standby mode after power is applied.；“ 1 ”： Last power state； “2or3”： Last power state.
power on
Normal tune speed Fast tune speed
Selection
left.
No kill horizontal sync when transfer. kill horizontal sync when transfer.
raster/normal picture transfer.
Stereo disable Stereo enable
NO used stereo IC:TA1216 used stereo IC:TA1216
Woofer installed Phone installed
Woofer volume control No woofer volume control
M system (4.5MHz) disable M system (4.5MHz) enable
B/G system (4.5MHz) disable B/G system (4.5MHz) enable
IC LA7910
See 1-2(page 4 ) See 1-5(page 4 )
power on
Selection tune of switch
upper right.
raster/normal picture transfer.
5
20 SIF 6.0M OPT
28
21 SIF 6.5M OPT 22 SIF AUTO OPT 23 24 25 26 27
PAL OPT N3.58 OPT N4.43 OPT
SECAM OPT
COL-AUTO OPT
IC TEST NORMAL“0”
I system (4.5MHz) disable I system (4.5MHz) enable
D/K system (4.5MHz) disable D/K system (4.5MHz) enable
No auto sound system detecting Auto sound system detecting
PAL system disable PAL system enable
N3.58 system disable N3.58 system enable
N4.43 system disable N4.43 system enable
SECAM system disable SECAM system enable
NO auto color system detecting Auto color system detecting
1-10 SET OF FACTORY MARK
10.1 Set of factory mark display on screen of tube when power on..
a. Press PROD key of remote control unit into FACTORY state. b. Press VOL- key of remote control unit until volume reduce to“0”， continue press VOL- key and at same time press CH- key of remote control unit, can be into set of factory mark state. Display
on screen see under figure.
FACTORY FLAG SET AAAAAAAAAA AAAAAAAAAA
10.2 Press CH+ key for sleet line. Press VOL+ key for every word of line. Press PP key of remote control unit to next word of same line.
a. Press VOL+ key to choose word of on screen display, when display on screen is , you can’t see any
thing’s on screen by power on.
10.3 SET OF FACTORY MARK OF FIRST LINE Press REVIEW key of remote control unit into set item of first line. Press CH+ key into set of next item.
Changes set state by press VOL+ key.
FACTORY LINE1 OPTION STATUS 开 SIZE 2 COLOR 7 SPACE 0 H-POS. 65 V-POS. 20
6
1-11.ECTRICAL SCHEMATIC DIAGRAM
VCC
N1
LC7461M-8103
PIN20
1 C3 24
2 C2 23 3 C1 22 VCC 4 C0 21 5 C4 20 6 C5 19 7 18 VCC 8 17 9 16 10 15 11 14 G1 12 13
PIN17
PIN16
PIN1
DVD
VOL+
PIN2 PIN3
9
-/--/--- 8 PIN18
MENU
PROD
POWER
PIN4
3 1 2 0
7 5 6 4 PIN19
TV/AV
SLEEP
POS+
C1 C2
PIN15
VOL-
JUMP
PIN14
ZOOM
P.P
C3 VD1
PIN13
C-SYS
WOOF
R1
V1 R2 1. N1 LC7461M-8103
2. VD1 IR-LED
3. V1 2SC1815
4. R1 RT14-1/4W-1Ω-J
7
MUTE
RECALL
V-CHIP
POS-
DISPLAY
CCD
User code： 5. R2 RT14-1/4W-220Ω-J C5 C4 C3 C2 C1 C0 6. C1 C2 CT1-05B-2B4-63V-220PF-K 0 1 1 1 0 0 7. C3 CD110X-6.3V-100UF-M
8. G1 455KHZ
Infrared remote control unit for service code：
C5 C4 C3 C2 C1 C0
1 1 1 1 0 1
Infrared remote control unit for use code：
C5 C4 C3 C2 C1 C0
0 1 1 1 0 0
Infrared remote control unit for users：
Pin1 Pin2 Pin3 Pin4
Pin20
19 4 5 6 7 18 8 9 -- TV/AV
17 NICAM AUDIO WOOF
0 1 2 3
9.VCC 2 pcs. AA batteries
16 VOL+ PROD MUTE CH+
15 VOL- CHANNEL POWER CH­14 PICTURE PP REVIEW CALL
13 SLEEP CLOCK PRESET SYSTEM
LA76818 PIN ARRANGEMENT AND FUNTION
No. FUNCTION NO. FUNCTION
1 Audio Output 28 Flyback Pulse Input 2 FM Output 29 VCO IREF 3 PIF AGC 30 Clock 4MHZ Output 4 RF AGC Output 31 CCD Vcc 5 PIF Input 1 32 CCD Fiter 6 PIF Input 2 33 CCD/ Horizontal Ground 7 IF Ground 34 SECAM B-Y Input 8 IF Vcc 35 SECAM B-Y Input
9 FM Filter 36 Chroma APC2 Filter 10 AFT Output 37 Clamp Filter 11 Bus Data 38 4.43MHZ Crystal
8
12 Bus Clock 39 Chroma APC1 Filter 13 ABL 40 Selected Video Output 14 Red Input 41 Video /Vertical /Bus Ground 15 Greed Input 42 External Video Input(Y-IN) 16 Blue Input 43 Video/Vertical Vcc 17 Fast Blanking Input 44 Internal Video Input(C-IN) 18 RGB Vcc 45 Black Lever Detector 19 Red Output 46 Video Output 20 Green Output 47 VCO Filter 21 Blue Output 48 VCO Coil 2 22 Fsc output or c_sync output 49 VCO Coil 1 23 Vertical Output 50 APC Filter 24 RAMP ALC Filter 51 Ext.Audio Input 25 Horizontal /Bus Vcc 52 SIF Output 26 Horizontal AFC Filter 53 SIF APC Filter 27 Horizontal Output 54 SIF Input
SERVICE ADJUSTMENT
1. Adjustment +B Voltage RP551
1.1 Test point--------- Two point of C561
1.2 Adjust RP551 so that the voltage (DC) becomes: 14 110V(CHAI HONG Tube)
21’’ 110V(CHAI HONG Tube) 25’’ 125V/130V(CHAI HONG Tube/HUA FEI Tube) 29’’ 125V(CHAI HONG Tube)
2. Adjustment of AFT: T101
2.1 Connect signal generator to the test point C101
CW…..38MHz/38.9MHz 80db
2.2 Connect digital voltmeter on point of R113 and R114.
2.3 Adjust T101(PIF detector coil) so that the detection output voltage(DC) becomes 3.6+0.02V。
Adjustment of RF-AGC
3.
3.1 Receive Philips pattern signal.
3.2 Sweep output ......62+1db
3.3 Connect digital voltmeter on point TP-A.
3.4 Press PROD key of remote control unit into ADTUST state.
3.5 Press CH+ key until adjustment item becomes RF—AGC. Press VOL+ key of remote control unit so
that voltage of digital voltmeter display becomes 5.5+0.1V
3.6 Press PROD key of remote control unit until normal.
4.
Adjustment of Vertical size
4.1 Receive Philips pattern signal(PAL system).
4.2 Press PROD key of remote control unit into ADTUST state.
4.3 Press CH+ key until adjustment item becomes V.SIZE. Press VOL+ key of remote control unit so
that vertical over scan is at 8%.
4.4 Receive Philips pattern signal(NTSC system) in AV state.
4.5 Press CH+ key until adjustment item becomes NT.V.SIZE. Press VOL+ key of remote control unit so
that vertical over scan is at 8%.
9
4.6 Press PROD key of remote control unit until normal.
5. Adjustment of Vertical center
5.1 Receive Philips pattern signal (PAL system).
5.2 Press PROD key of remote control unit into ADTUST state.
5.3 Press CH+ key until adjustment item becomes V.POSI . Press VOL+ key of remote control unit so that vertical center of picture comes mostly close to the geometrical center of CRT.
5.4 Receive Philips pattern signal (NTSC system) in AV state.
5.5 Press CH+ key until adjustment item becomes NT.V.POSI.. Press VOL+ key of remote control unit so that vertical center of picture comes mostly close to the geometrical center of CRT.
5.6 Press PROD key of remote control unit until normal.
Adjustment of Vertical line
6.
6.1 Receive Philips pattern signal (PAL system).
6.2 Press PROD key of remote control unit into ADTUST state.
6.3 Press CH+ key until adjustment item becomes V.LINE . Press VOL+ key of remote control unit so that vertical line of picture comes mostly close normal.
6.4 Receive Philips pattern signal (NTSC system) in AV state.
6.5 Press CH+ key until adjustment item becomes NT.V.LINE . Press VOL+ key of remote control unit so that vertical line of picture comes mostly close normal.
6.6 Press PROD key of remote control unit until normal.
7. Adjustment of Sign horizontal/vertical positioning
7.1 Receive Philips pattern signal (PAL system).
7.2 Press PROD key of remote control unit into ADTUST state.
7.3 Press CH+ key until adjustment item becomes OSD.H.POSI. Press VOL+ key of remote control unit so that title sign of on screen ADJUST at horizontal center of Philips pattern signal.
7.4 Press CH+ key until adjustment item becomes OSD.V.POSI. Used VOL+ key of remote control unit
so that sign of on screen ADJUST in title block of Philips pattern signal.
7.5 Press CH+ key until adjustment item becomes OSD.CONT. . Press VOL+ key of remote control unit
so that OSD contrast can be seed clear.
7.6 Press PROD key of remote control unit until normal.
8. Adjustment of background
8.1 Receive white pattern signal.
8.2 Press PROD key of remote control unit into B/W adjustment state.
8.3 Press CH+ key until adjustment item becomes S-BRI (see under table). Press VOL+ key of remote control unit so that adjustment title becomes start status.
NAME
S-BRI 0--127 20 START R-BIA 0--255 20 START G-BIA 0--255 20 START B-BIA 0--255 20 START R-DRI 0--127 60 START G-DRI 0--15 8 START B-DRI 0--127 60 START C.B/W
8.4 Press MUTE key of remote control unit for service so that horizontal raster on screen of tube. Turn
10
RANGE START STATUS
0
SCREEN of FBT. Counter clockwise until horizontal raster of either of three colors R.G. and B Appears slightly on CRT. Here, one of the three colors appears as screen control is turned.
8.5 Adjust bias controls (two of R-BIA, G-BIA, B-BIA) other than that belonging to displayed color to make white the horizontal raster.(under white the horizontal raster state, “2”and“3”//“4”and “5”//“6”and“7”key of remote control unit can be in crease and in reduce for R-BIA G-BIA B- BIA .
8.6 Press NUTE key on infrared remote control unit to picture normal state. Press CH+ key until adjustment item becomes C.B/W, press VOL+ key of remote control unit until becomes 2. Press CH+ key until adjustment item becomes S-BRT, press VOL+ key of remote control unit until becomes 99. Adjustment R.DRI/ G.DRI/. B.DRI until picture becomes white by press CH+, VOL+ key.
8.7 Press PROD key of remote control unit until normal.
10. ADJUST ITEM/SETUP ITEM TABLE
1) 10.1
Item
0 H.PHASE 1 V.SIZE Ranges：0~127 2 V.LINE Ranges：0~31 3 V.POSITION Ranges：0~63 4 V.SC Ranges：0~31 5 H.PHASE(50) Ranges：-7~+8 (Available for NTSC-M and PAL-M/N) 6 V.SIZE(50) Ranges：-31~+32 (Available for NTSC-M and PAL-M/N) 7 V.LINE(50) Ranges：-7~+8 (Available for NTSC-M and PAL-M/N) 8 V.POSI.(50) 9 V.SC(50) Ranges：-7~+8 (Available for NTSC-M and PAL-M/N)
(LC863420C-5MOO) SETUP ITEM
Name Descriptions
Ranges：0~31
Ranges：-31~+32 (Available for NTSC-M and PAL-M/N)
(MENU0)
2) ADJUSTMENT ITEM (MENU1)
Item
0 1 2 R-Y/B-Y G.BL Ranges：0~15，Generally it is set on “8”.
Name Descriptions
RF.AGC VOLUME OUT
Ranges：0~63 Ranges：0~127
3 R-Y/B-Y ANG. Ranges：0~15，Generally it is set on “8”. 4 B-Y DC LEVEL Ranges：0~15，Generally it is set on “8”. 5 R-Y DC LEVEL Ranges：0~15，Generally it is set on “8”. 6 YUV B-Y DC Ranges：0~15，Generally it is set on “8”. 7 YUV R-Y DC Ranges：0~15，Generally it is set on “8”.
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