akira CT-25TW9AN User manual

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2
Model No: CT-25TW9AN
Version 1.0
9
CHASSIS: 5P60
MODEL:
CT-25TW9AN

3
Model No: CT-25TW9AN
Version 1.0
CONTENT
SAFETY NOTICE ................................................................................................................................... 4
TECHNICAL SPECIFICATION ............................................................................................................. 5
GENERAL SPECIFICATION................................................................................................................. 6
CHASSIS BLOCK DIAGRAM ............................................................................................................... 7
CHASSIS WIRING DIAGRAM............................................................................................................ 17
PBC BOARD ......................................................................................................................................... 18
SERVICE ADJUSTMENT .................................................................................................................... 21
MECHANICAL DISASSEMBLY......................................................................................................... 30
SCHEMATIC DIAGRAM..................................................................................................................... 32
THROUBLE SHOOTING CHART....................................................................................................... 34

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Model No: CT-25TW9AN
Version 1.0
SAFETY NOTICE
SAFETY PRECAUTIONS
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 resistor-
capacitor network 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 must be
maintained within the specified limits.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement 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 designed 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 !.

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Model No: CT-25TW9AN
Version 1.0
TECHNICAL SPECIFICATION
FEATURES
• Hyper-Band Tuner
• 100-Channel Memories
• NTSC Playback
• Front or Side AV Input
• S-Video Input
• On-Screen Display
• Sleep Timer
• Auto Search/Store/Shut-Off
• Full function Remote Control
• 8W X 2 Speakers
• 746 (W) x 483 (D) x 519 (H) mm
• Weight: 38Kg
• Options:
o DVD-Component Input
o Fastext
o MTS
o NICAM/German Stereo
o Wide Power Supply

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Model No: CT-25TW9AN
Version 1.0
GENERAL SPECIFICATION
POWER CONSUMPTION 150W MAX
STANDBY POWER CONSUMPTION 5W
RECEIVER SYSTEM D/K; I; B/G; M
COLOUR SYSTEM PAL/ SECAM / NTSC
VISION INTERMEDIATE FREQUENCY 38.9MHz
4.5 MHz (M)
5.5 MHz (B/G)
6.0 MHz (I)
6.5 MHz (D/K)
5.85 MHz (NICAM B/G, D/K)
6.55 MHz (NICAM I)
INTER-CARRIER FREQUENCY
5.74 MHz (GERMAN STEREO)
CHROMA IF FREQUENCY PAL/NTSC 34.47 / 35.32 MHz
ANTENNA TYPE DIN TYPE 75 OHM
VHF-1 A-0; E2-E4; S1-S9 CH 44.25-161.25 MHz
VHF-2 S10-S41; E5-E12 CH 168.25-163.25MHz
CHANNELS RECEIVING
UHF E21-E69 CH 471.25-863.25 MHz
TUNING SYSTEM VS TUNING
1 AV IN+1 AV OUT; 1 FRONT AV INPUT
1 S-VIDEO IN, 1 YUV IN (OPTION);
AV IN/OUT
21 PIN SCART (OPTION)
Y/C IN-----y 1.0 0.2Vp-p 75 ohm c: 0.7Vp-p 75 ohm
VIDEO IN ----1.0 0.2Vp-p 75ohm
AUDIO IN ---- 0.2V (r.m.s)
VIDEO OUT ---- 1.0 0.2Vp-p 75ohm
AUDIO OUT ----0.2V (r.m.s)
RGB IN: -----0.7Vp-p
AV IN/OUT SPECIFICATION
YUV ---- Y 1.0Vp-p; U 0.7Vp-p; V 0.7Vp-p
OSD LANGUAGE ENGLISH, RUSSIAN, IRANIAN, ARABIC,
ITALIAN, TURKIC, GERMAN, FRANCE
TELETEXT LANGUAGE PAN-EUROPEAN, CYRILLIC 2, IRANIAN,
ARABIC
AUDIO OUTPUT POWER >5W (1KHz, 0.5v INPUT, 10% THD)
SAFETY AUTHENTICATION STANDARD CB/ CE
LED INDICATOR POWER ON
HAND SET TYPE HS08 HS09
HAND SET POWER SUPPLY BATTERY 3V UM-3/R6/AA x2
COLOUR PICTURE TUBE 25” – 38” 110 DEGREE TUBE
REMOTE CONTROL DISTANCE 5m

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ModelNo:CT-25TW9AN
Version 1.0
CHASSIS BLOCK DIAGRAM

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Model No: CT-25TW9AN
Version 1.0
IC 401 (UNIVERSAL HI-FI AUDIO PROCESSOR) TDA9859H
IC605. IC606 <REGULATORS> L7800 SERIES
1
INPUT
2
OUTPUT
SERIES
PASS
ELEMENT
SOA
PROTECTION
REFERENCE
VOLTAGE
ERROR
AMPLIFIER
THERRMAL
PROTECTION
STARTING
CIRCUIT
CURRENT
GENERATOR
REFERENCE
VOLTAGE
3
GND

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Model No: CT-25TW9AN
Version 1.0
IC 402 (SRS TRUBASS) NJM2192 AM

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Model No: CT-25TW9AN
Version 1.0
IC 401 (AV SWITCH W/IIC BUS CONTROL) M52797SP

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Model No: CT-25TW9AN
Version 1.0
IC 101 (SYSTEM TV SIGNAL PROCESSOR-TELETEXT)
TDA93XXPS/N2/5I

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Model No: CT-25TW9AN
Version 1.0
IC 103 (DIGITAL TV SOUND DEMODULATOR / DECODER)
TDA9874AH

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Model No: CT-25TW9AN
Version 1.0
IC 302 (VERTICAL DEFLECTION BOOSTER) (TDA4863AJ)
IC 404(BTL AUDIO AMPLIFIER)(TDA8944J)

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Model No: CT-25TW9AN
Version 1.0
IC 803(MULTISTANDARD COMB FILTE) (TDA9181T)
IC 802(HEF4052)

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Model No: CT-25TW9AN
Version 1.0
IC 601 <PHOTO TRANSISTOR> TLP621
IC 604 <POWER SWITCH> KA5Q12XXRF
TLP621
1
23
4
1:ANODE
2:CATHODE
3:EMITTER
4:COLLECTOT

C5148
BCE
P5NK50Z
GDS
C2216
C
BE
CB
E
C2230
CB
E
C2482
CB
E
C2703
CB
E
B774
CB
E
C1815
CB
E
B420
CB
E
B421
CB
E
CB
E
A1015
PNP PNP
NPN
NPN
PNP
C2120
CB
E
PNP
C2717
C
BE
NPN NPN
L7805
INPUT
GND
OUTPUT
L7812
INPUT
GND
OUTPUT
L7809
INPUT
GND
OUTPUT
Se140
Vout SENSE
COLLECTOR
GROUND
A1013
NPN NPN NPN
PNP
Transistor Mark
-14-
CB
E
A966
PNP
GND
OUTPUT
BE
C
S3904

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Model No: CT-25TW9AN
Version 1.0
CHASSIS WIRING DIAGRAM
CN 701
FROM CN802A
CN 706
FROM Cn805
+H403
CN 703
FROM CN801A
FOCUS
SCREEN
CN401A
H502
FROM CN 302
CN 601
CN 602
H501
FROM CN 203
CN 806
TO CN 705
CN 805
TO CN 706
CN 203
TO H501
CN 202
TO KEYBOARD
CN 803
TO CN 704
CN 802
CN 701
CN 801A
TO CN 703
CN 301
CN401B
TO FRONT AUDIO IN
TO FRONT VIDEO IN

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Model No: CT-25TW9AN
Version 1.0
PBC BOARD

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Model No: CT-25TW9AN
Version 1.0
CAM350 PRO V 6.0 : Wed Jan 15 10:17:54 2003 - (Untitled)

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Model No: CT-25TW9AN
Version 1.0
SIDE FRONT AV & AV PCB TOP LAYER
CONTROL PCB TOP LAYER
5800-D25TMY-01