akira CT-21FGS1 User manual

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Model No: CT-21FGS1
Version 1.0
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S1
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1
CHASSIS:
A21T01(TB1238)
MODEL:
CT-21FGS1

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Model No: CT-21FGS1
Version 1.0
CONTENT
GERAL DESCRIPTION.......................................................................................................................... 4
SAFETY INSTRUCTION ....................................................................................................................... 6
CIRCUIT ADJUSTMENT ....................................................................................................................... 7
FAULT FINDING TREES, DIAGRAMS & OVERVIEWS................................................................. 14
VARIOUS PARAMETERS OF INTEGRATED CIRCUIT.................................................................. 22
ELECTRICAL PART LIST ................................................................................................................... 30
CIRCUIT DIAGRAM ............................................................................................................................ 40

4
Model No: CT-21FGS1
Version 1.0
GENERAL DESCRIPTION
AKIRA AKTP01 is a CTV monolithic chassis currently developed by AKIRA Co.
It introduces a monolithic IC TB1238AN developed by Toshiba Co. To carry out all the small signal
processing TB1238AN is a kind of IC used by color TV in PAL/NTSC system, which is controlled by
Inter IC Bus. Together with the SECAM decoder TA1275Z, it can form a signal processing circuit for
multi-system color TV. This chassis is used in many fashionable TV receiver technologies, which
makes the performance reach the advanced level of the world.
Figure 1 shows the block diagram of AKTP01(A21T01).
Table 1 provides A21T01 mainly ICs and functions.
Figure 2 shows the whole set power supply system for AKTP01(A21T01).
Figure 3 shows the system control circuit of AKTP01(A21T01).
Table 1: A21T01 mainly ICs and functions
Location Type Function Description
D901 87CM38N-3GN5/
87CK38N-2B46
System control microprocessor
D902 AT24C08 EEPROM
N101 LA7910 Band decoder
N252 CD4053BE TV/AV switching
N203 CD4053BE AV1/AV2 Switch
N201 TB1238AN Small signal processor (IF/VIDEO/CHROMA/DEF)
N402 LA7830 Vertical output power amplifier
N701 TA1275AZ SECAM decoder
N202 CD4052BE Sound system switching
N701 AN5270 Audio power amplifier (L)
N711 AN5270 Audio power amplifier(R)
A903 HS0038A Remote control receiver

5
Model No: CT-21FGS1
Version 1.0
REMOTE
HEAT
FOCUS
EHT
SCREE
+300V
POWER SUPPLY
CIRCUIT
V512V513V511
T501VD515
Resistance
disturbance
C501L502
AC150-260V
50/60Hz Bridge
rectification
VD503-VD506
Filte
r
C507
FIELD OUTPUT
POWER AMP.
N402(LA78040)
HORIZONTAL
DRIVE
V444
T401
HORIZONT
AL
OUTPUT
V411
FBT(T402)
BSC25
MEMORY
(D902)
ST24C08
KEY
BOARD
REMOTE
RECEIVER
A903
114
146
24V
13V
19V
4
5
V.OU
T
6
5
MICROCONTROLLOR
D901
87CM38N-3GN5
87CK38N-2B46
AUDIO AMPLIFIER
N701 AN5270
AUDIO AMPLIFIER
N711 AN5270
SMALL SIGNAL
PROCESSOR
(IF/VIDEO/CK\HROMA/DEF)
N201
TB1238AN
AV1/AV2 switching
N203 CD4053BE
TV/AV switching
N252 CD4053BE SOUND SYSTEM SWITCH
N202 CD4052BE
8
8
L
R
4
15
2
2
L OUT
R OUT
V OUT 14
L IN1
R IN1
V IN1
L IN2
R IN2
V IN2
1225
13
1
3
TUNER
TUN101
SIF TRAPS
Z235~Z238
SIF BPS
Z231~Z234
1
2
4
12 14 15
V10
1
SAW
F
Z101
6
7
2
35
SECAM DECODER
N251 TA1275AZ
15 13
1
3
5
1
21
3
3
3
3
29
Y
R-Y
B-Y
SCP OUT
SID OUT
1
2
V251
V OUT
TV AUDIO
V23
47
IF VIDEO
13
13
43
VIDEO
OUT
1
1
4
5
2
1
IF IN
IF IN
26
27
4
3
9
1
1
34
9
10 11
14
3
3
1
3
SDAO
SCLO
AFC IN
H.SYN
15
1
35
1
1
SCL1
SDA1
6
5
A
B
4
4
A
B
VOL
VOL
22
§
25
13~16
R,G,B, Y/BL
26
27
VIDEO
AMPLIFIER
V602
,
V612
,
V622
1
1
20
R
G
B
7
3
24
H OUT
VD
H
D