AKIRA AKIRA CT14HS9/CE, CT14HS9CE, CT21HS9/CE(S), CT21HS9BN, CT21SWP1/CE, CT21SWP1CE Service manual & schematics
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CHASSIS: 3YA1
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MODEL:
CT-21HS9/CE
Model No: CT-21HS9CE
Version 1.0
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CONTENT
SAFETY NOTICE ................................................................................................................................... 4
TECHNICAL SPECIFICATION............................................................................................................. 5
CHASSIS BLOCK DIAGRAM............................................................................................................... 6
IC BLOCK DIAGRAM ...........................................................................................................................7
TRANSISTOR MARK ..........................................................................................................................11
CHASSIS WIRING DIAGRAM............................................................................................................ 12
ADJUSTMENT MODE ......................................................................................................................... 13
CIRCUIT DIAGRAM............................................................................................................................ 17
Model No: CT-21HS9CE
Version 1.0
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SAFETY NOTICE
SAFETY PRECAUTION
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 provided 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 resistorcapacitor 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.
Model No: CT-21HS9CE
Version 1.0
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TECHNICAL SPECIFICATION
FEATURE
A C 9 0 V - 2 6 0 V 5 0 / 6 0 H z
M U LT I SY S T E M : PA L B G /D K / I, SE C A M B G / D K( O P T IO N ), N T S C M
(O P T IO N )
VOLTAGE SYNTHESISED TUNING SYSTEM
100/256 PROGRAMS MEMORY (OPTION)
BLUE BACK FUNCTION
120 MINUTES SLEEP TIMER
FULL AUTO PROGRAM
TIME ON
CLOCK ; CHILD LOCK
2 AV INPUT
GAME (OPTION)
8 PAGES TELETEXT (OPTION)
BLACK LEVEL STRETCH
PROGRAM VIEW FUNCTION
FOUR PICTURE MODE MILD; COLORTUL; STANDARD; CUSTOM; DYNAMIC
GENERAL SPECIFICATION
Power consumption 14 70W MAX
21 90W MAX
Receive system D/L: I B/G: M
Color system PAL/ SECAM/ NTSC
Vision intermediate frequency 38.9MHz
4.5 MHz(M)
Inter-carrier frequency
Chroma if frequency PAL/ NTSC 34.47/ 35.32MHz
Antenna type DIN TYPE 75 Ohm
Channel receiving
Tuning system VS tuning
AV IN/ OUT 2 AV IN + 1 AV STEREO OUT
AV IN/ OUT specification
OSD language English
Audio output power > 3W (1KHz, 0.5V INPUT, 10% THD
Safety authentication standard CB
LED indicator Power ON
Hand set type HS08
Hans set power supply Battery 3V UM-3/ R6/ AA x 2
Colour picture tube 14” 21” 90 degree tube
Remote control distance 5m
5.5 MHz(B/G)
6.0MHz(I)
6.5MHz(D/K)
VHF-1 A0; E2-E4; S1-S9 CH 46.25-161.25MHz
VHF-3 S10-S41; E5-E12 CH 168.25-463.25MHz
UHF E21-E69 CH 471.25-855.25MHz
VIDEO IN ----1.0 0.2V
AUDIO IN ----0-2V (r.m.s)
VIDEO OUT ----1.0 0.2V
AUDIO OUT ---- 0-2V (r.m.s)
75 Ohm
p-p
p-p
75 Ohm
Model No: CT-21HS9CE
Version 1.0
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CHASSIS BLOCK DIAGRAM
Model No: CT-21HS9CE
Version 1.0
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IC BLOCK DIAGRAM
IC 201 (IIC BUS SINGLE CHIP VIF, SIF, VIDEO CHROMA) LA76810A/ HA
Model No: CT-21HS9CE
Version 1.0
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IC 402 & IC 403 (3W AUDIO OUTPUT) LOA 4285
IC 701 <TELETEXT> STV-5348
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Model No: CT-21HS9CE
Version 1.0
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IC 301 <VERTICAL OUTPUT> LA7840
IC 602 < POWER > STR-G6653
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Model No: CT-21HS9CE
Version 1.0
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IC 202 <SECAM> la7642
IC 203, Q 609, IC601 & IC 302 < REGULATORS> L7800 SERIES
D613 <PHOTO TRANSISTOR> TLP 621
Model No: CT-21HS9CE
Version 1.0
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TRANSISTOR MARK
Model No: CT-21HS9CE
Version 1.0
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CHASSIS WIRING DIAGRAM
Model No: CT-21HS9CE
Version 1.0
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ADJUSTMENT MODE
There is no direct method to enter production menu, user must follow the instruction as below.
i) Move to “Picture” menu
ii) Press Channel Reverse key
iii) Press Mute key
After the following action, a production menu will be shown out. User can use “Sleep” key to change
the production menu page and use “User Menu” key to quit production menu.
Production Menu 1 OSD
MENU 1
V. SIZE X
V.POS X
V.LINE X
V.SC X
H.PHASE X
H.BLK X
PATTERN X
H.FREQ X
Item Function Range
V.SIZE Aligh vertical amplitude 0-127
V.POS Aligh vertical DC bias 0-63
V.LINE Align vertical linearity 0-31
V.SC Aligh vertical S-correction 0-31
H.PHASE Aligh sync to flyback phase 0-31
H.BLK Left/ Right blanking control L7-R7
0: Normal screen
1: White screen
PATTERN
H.FREQ Align horizontal frequency (valid for LA76810 ES10) 0-63
2: Gray screen
3: Black screen
4: White cross signal
0-4
Model No: CT-21HS9CE
Version 1.0
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Production Menu 2 OSD
MENU 2
V.KILL X
R.C X
G.C X
B.C X
R.D X
G.D X
B.D X
COL.TEST X
Display and control properties are as same as production menu 1.
Item Function Range
V.KILL Disable vertical output 0-1
R.C Align red out DC level 0-255
G.C Align green out DC level 0-255
B.C Align blue out DC level 0-255
R.D Align red out AC level 0-127
G.D Align green out AC level 0-15
B.D Align blue out AC level 0-127
COL.TEST IF LA76810 ES12 or later version use, set to “1” 0-1
Production Menu 3 OSD
MENU 3
RF.AGC X
VIF.SYS X
SND.TRAP X
VIDEO LVL X
FM.LEVEL X
R.B BALANCE X
DIGITAL.OSD X
Display and control properties are as same as production menu 1.
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Model No: CT-21HS9CE
Version 1.0
Page 15
Item Function Range
RF.AGC Align RF AGC threshold 0-63
0:38.0 MHz
VIF.SYS
SND.TRAP Sound Trap 0-7
VIDEO LVL Align IF video level 0-7
FM.LEVEL Align WBA output level 0-31
R.B BALANCE R-Y / B-Y gain balance 0-15
DIGITAL.OSD Digital/ Analog OSD 0-1
0: Analog OSD, Capacitors (259, C260, C261) need to
1: Digital OSD, Capacitors (259, C260, C261) do not
Production Menu 4 OSD
MENU 4
SUB-BRI X
OSD CONT X
B.GAM.SEL X
RG.GAM.DEF X
SCM B-Y DC X
SCM R-Y DC X
BLUE.BACK X
C/E OSD X
Item Function Range
SUB-BRI Align commom RGB DC level 0-127
OSD CONT Align OSD AC level 0-127
B.GAM.SEL Blue gamma selection 0-3
RG.GAM.DEF Disable R/G gamma correction 0-1
SCM B-Y DC Secam B-Y DC level 0-15
SCM R-Y DC Secam R-Y DC level 0-15
BLUE.BACK
C/E OSD
1:38.9 MHz
2: 45.75 MHz
3: 58.75 MHz
connect between LC863320 & LA76810)
need to connect between LC863320 & LA76810)
0: Red Back
1: Blue Back
0: OSD display fix to English
1: OSD display can select between Chinese & English
0-3
0-1
0-1
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Model No: CT-21HS9CE
Version 1.0
Page 16
Production Option Menu OSD
OPTION
2 AV CHANNEL X
COL.SYS.SEL X
TELETEXT ON X
MONITOR OUT X
LOGO ON X
BRISP.SEL X
SVHS.SEL X
5V TUNER X
Display and control properties are as same as production menu 1.
Item Function Range
2 AV CH
C.SYS.SEL
TELETEXT ON
MONTR OUT
LOGO ON
BRISP.SEL
SVHS.SEL
TUN.TYPE
0: 1 AV channel
1: 2 AV channel
0: AUTO/ PAL/ SECAM/ NTSC1/ NTSC2
1: AUTO/ PAL/ NTSC1/ NTSC2
2: AUTO/ PAL/ SECAM
3: NOT VALID
0: Teletext circuit not valid
1: Teletext circuit valid
0: For non-china market (AV output is TV signal)
1: For china market (AV output is Video signal)
0: Logo display non-valid
1: Logo display valid
0: When program change, bright value change
1: When program change, bright value not change
0: NO S-VHS
1: S-VHS ON
0: Use 9V tuner
1: Use 5V tuner
2: High Gain tuner
0-1
0-3
0-1
0-1
0-1
0-1
0-1
0-2
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Model No: CT-21HS9CE
Version 1.0
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CIRCUIT DIAGRAM
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Model No: CT-21HS9CE
Version 1.0
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