Akai ATV-350R User manual

SERVICE MANUAL
Model:
ATV350R
RECIVER WITH MONITOR
www.akai.ru

AKAI ATV-350R Maintenance Manual
ATV-350R Maintenance Manual
1. Repairing Procedures for No sound, No Picture and No Light
Check whether power
indicator lights in red.
Press POWER to check whether 0~5V or 5~0V
change is available on CPU (7) pin or not
Check whether +5V supply of
CPU is normal or not
Check whether input +12V
and 78L05 is broken or not
Change
CPU
Check whether C1815, B1203 for ON/OFF
of CPU and subsequent supply circuit is
short-circuited or not.
Change 32K
crystal
oscillation.
Change
B1203, C1815
Check whether each voltage for the
output of power supply is normal or not
Repair power supply
and supply circuit
Check whether high voltage supply
N25 is open-circuited or not Change audion of high voltage circuit or the high voltage transformer
Check whether output of high
voltage is available or not
Change high voltage
transformer
Change LCD
screen
Yes
No
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Check whether external circuit for
key input pin and CPU (10) (11)
pins are normal or not.
Yes

AKAI ATV-350R Maintenance Manual
2. Repairing Procedures for Inferior Color
Check whether output voltage from
LA76810 (19) (20) (21) is normal or not
Whether LA76810 (30) (31) pins are short-circuited or
not and whether (18) pin is normal or not.
Check whether loop of 3Y26 (6) (8) (9) and
LA76810 (19) (20) (21) is normal or not
Change module of
LCD software
Change the broken
elements of loop
Check whether periphery pf
3Y26 is normal or not
Change
3Y26
Yes
No
Yes
No
No
No

AKAI ATV-350R Maintenance Manual
3. With Sound, With Light and Black Screen
Check whether power supply of LA76810
(25) (18) pins is normal or not
Whether the earthing resistance of
LA76810 (29) pin is normal or not.
Check power
supply
Check whether LA76810 (13) (12)
(11) pins are normal or not
Yes
No
Yes
Yes
No
No Check whether line field pulse
of CPU is normal or not.
Check whether the copper sheet of line field synchronous
pulse loop is open or short-circuited or not.
Change 3Y26
Whether change
CPU is OK.
Change the resistance
Yes
No
No Check the LA76810 line field
synchronous circuit.
No
Check LCD screen

AKAI ATV-350R Maintenance Manual
4. Repairing Procedures for Line Field Asynchronization
Check whether to 3Y26
(2) pin is OK or not
Check whether +5V, +8V power
supply of LA76810 is normal or not
Repair power
supply
Check whether peripheral circuit of
LA76810 (26) pin is normal or not
Change 1UF 333 capacitance
Change
module
Change
3Y26
Yes
No
Yes
Yes
No
Check peripheral circuit of 4001 1C (circuit for
treatment of line field synchronization)
Change LCD
screen
No
Yes
No

AKAI ATV-350R Maintenance Manual
5. Repairing Procedures for White Light
Test whether the switch power supply
+5V, +8V and –15V is normal or not
Whether repair power supply and subsequent
circuit is short-circuited or overloaded
Test whether 3Y26, +5V and +7.5V power
supply is normal or not
Check whether 3Y26 is
b
roken or not
Check the loop of power
supply circuit
Test whether +5V, +17V and
–15V of bus socket is normal or
Yes
No
Yes
No
No
Change module of
LCD software
Change LCD
screen
Yes
No
Check the loop of
power supply
No

AKAI ATV-350R Maintenance Manual
6. No Signal
Test whether +40V is normal or not
Check 40V loop
Test whether wave band switch voltage is
available with CPU (1) (41) (42) pins
Change CPU
Check periphery of (50) pin
for pre-central amplifier
Check whether circuit of pre-central amplifier and
periphery of LA76810 (50) pin is normal or not
Yes
No
Yes
No
No
Check whether AGC voltage for +5V power
supply of high frequency head is normal or not
Change high
frequency head
Yes
No
Check 5V power supply
and AGC circuit
Yes

AKAI ATV-350R Maintenance Manual
7. No Storage of Program
Check whether 32V tuning voltage is stable or not
Repair tuning loop
Check whether AFT circuit is normal or not
Repair AFT circuit
Yes
No
Yes
No
Change high frequency head and sound surface

AKAI ATV-350R Maintenance Manual
8. With Picture, No or Low Sound and Distortion
Test whether loudspeaker is open circuited or not
Change loudspeaker
Test whether power amplifier 386
is broken or not
No
Yes
No
Yes
Yes Test whether power amplifier 386 is broken or not
Check whether LA76810 (1) (2) pins are
normal or not
Change peripheral circuit
of (52) (53) (54)
Change peripheral
elements of (1) (2) pins
Change LA76810
Yes
No
Check whether LA76810 (52) (53) (54)
pins are normal or not
No

AKAI ATV-350R Maintenance Manual
9. Dark Light
Check whether contrast and brightness
are adjusted to minimum or not
Adjust till OK
Check whether power supply of
each circuit is normal or not
Adjust potentiometer of mainboard BRI to
see whether there is change or not
Change 3Y26
No
Yes
No
Yes
Set analog quantity of TV at standard
Yes
Check whether peripheral elements of
3Y26 are normal or not
No
Check supply
circuit

AKAI ATV-350R Maintenance Manual
10.With Picture, With Sound, No Character or Inferior Color
Check CPU 32K crystal oscillation
Change 32K crystal oscillation
Check whether CPU (22) ~ (25) to LA76810
(13) – (16) is normal or not
No
No
Yes
Check whether pulse input of CPU line
field synchronization is normal or not
Change loop elements
Yes
Check line field
synchronization circuit
Inferior character color
Change CPU or LA76810
No
Yes

AKAI ATV-350R Maintenance Manual
11.No Picture or No Sound in AV
Check whether connection conversion
line is normal or not
Change AV
conversion line
Check input socket
Change input socket
Change LA76810
No
Yes
No
Yes
Check the loop of audio and LA76810 (51) pin, and the
loop of video and LA76810(42) pin

AKAI ATV-350R Maintenance Manual
12.Without radio
Test whether the indicator light is red or not
Test power is on or off
Test whether IC7088 (11) pin is
with noise or not with screwdriver.
Change peripheral circuit
Change peripheral
elements
Yes
NO
No
Yes
Check whether IC7088 voltage pin are
normal or not
Change IC7088
Yes
No
Check whether IC7088 pin (5)\(11)\(2)
are normal or not
No

AKAI ATV-350R Maintenance Manual
13.Battery box can not charge
Put on the position of charging
ON
Change IC 34063
Check whether IC 34063 (1) (3)(5) (7) pins’voltage is normal or not
Check whether if it is on the charging
position
yes
No
Yes
Change bad elements
No

11 22
3
34 4
5
5
CF1
CF38.0
1 2 3 4 5 6 7 8 9
10 11 12
13
14
15
16
17
18
19
20
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
IC14
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
IC8
LA7642N
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21 22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
IC1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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
IC5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 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
IC15
A0 1
A1 2
A2 3
A3 4 SDA
5
SCL
6
TEST
7
VCC(5V)
8
IC6
24C04
1 2 3
4 5
U1
IC5
1
2
3
4 5
6
7
8
IC7
TDA7052A
AGC
1
VT
2
BU
3
BH
4
BL
5
BM
6
IF
7
ANT
8
IFU1
TDQ-3CV1
1
2
3
4
5 6
7
8
9
10
T2
TRANS-09
1
2
3
4
56
7
T1
TRANS-PCO43
1 2 3 4 5 6 78
9
10 11 12 13 14
IC10
1 2 3 4 5 6 78
9
10 11 12 13 14
IC9
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16
IC12
74HC4053
DK1
ANT
DK2
AV
DK3
OULT
DC1
12VIN
C150
104
R179
100 R175
100 R178 100
R176
51K
R177
62K
R180
47K R181
33K
C173
104
C174
104
C175
104
+7V 5V
C177
104
C178
104
C179
104
C180
104
R182
12K
C176
220uF
5V
C181
104
C182
104
C183
104
R184
1K5
R185
1K5 R186
1K8
R138
47K
R139
47K
R140
36K
R141
47K
R142
27K
R143
47K
R144
47K
R153
1K
R146
36K
R147
56K
R148
47K
R149
36K
R150
47K
C148
104
C149
104
C151
104
C152
104
C153
104
C154
104
5V
R151
100
R152
100
R155
36K
R183
47K
R154
30K R156
51K
C157
104
C156
104
R157
10K R158
10K
R159
10K
C8
103
C1
104
C2
100uF
C4
22uF C5
10uF C6
10uF C7
10uF R5
150
R1
100
R2
4K7 R49 220
R51
1K R52
33
ANT1
C9
104
C12
104
C11
104
R4
22K
R8
22K
R10
22K
R3
12K
R6
51K
R9
22K R11
470
R15
4K7 R12
10K
R14
1K2
C13
680P
C14
100P R13
10K R16
10K
R17
10K
R18
10K
R19
680
R20
10K
R23
10K
R25
330
R27
270K
R29
4K7
R31
4K7
R32
8K2 R34
1K5
R255
3K3
D11
IN4148
R134
1K
C3
104
C60
102
+5V
C37
103
+8V
R59
22K
R61
100
R62
22K
R63
22K
R64
22K R65
100
R66
22K R67
100
R69
22K
R70
22K
R71
220
R72
22K R73
220
R75
3K3
R76
4K7
R77
3K3
R79
4K7
D1
IN4148
D2
IN4148
X1
32K
C15
18P
C16
15P
1 2 3 4
P1
IR C5V KEY GND
C18
103
C19
1uF
C20
22uF
Q2
A1015
ZD1
3V9
C21
103
AV2
L/R
U/D
REMOTE
SD
SCL
SDA
C5V
C5V
C5V
C5V
C5V
+5V
AGC
+33V
16:9
4:3
VOR
POWER
REMOTE
P/N
R48
4K7
R50
3K3
C36
103
C38
223
C39
223
C40
103
C41
103
R53
100K
R55
100K R5727K
C43
1uF
+5V
SD
BO
GO
RO
+8V
BLK
B
G
R
SCL
SDA
AFT
C44
1uF
R60
100K
+5V
R68
2K2
R74
120
R78
3K3
R80
2K2
R81
10K
C47
474
C48 224
C49
333
C50
1uF
C51
100uF
VER
+5V
+8V
AGC
VOL
C82
39P
C85
102
C86
1uF
C87
18P
R101
1K
R103
330
L6
15uH
C90
10uF
C98
10uF
C94
0.47uF
C89
0.47uF
AUDIO
R105
180K
R104
220
C92
470P
C91
56P
LT2
VIDEO
R109
1K5
R110
1K
R111
22K
R112
560K
R108
47K
C96
1uF
C95
4u7
C97
0.47uF
+5V
C99
103
C100
220P
R114
100
R115
1K
R113
2M +5V
C101
18P X2
4.433MHz
C105
10uF
C103
103
R116
1K
R117
10K
R118
150
C102
103
C104
103
C107
103
Q13
A1015
C108
103
+5V
C115
103
C114
103
C111
10uF
C113
100uF
R120
100
R121
10K
R122
1K R123
4K7
R124
1K
R125
4K8
R119
1K
+8V
CHROMA
C106
1uF
C109
1uF
C110
1uF
C112
1uF
C155
1uF
C158
1uF
+8V
C84
4u7
C88
220uF
C93
4u7
C83
472
R100
5K1
R102
39
R106
22K
R107
10K
R145
47
1
2
P4
+ -
R83
10K
R128
1K
R82
2K2
R85
10K
R86
33K
R87
10K
R89
10K
R91
10K
C120
104
+8V
C116
47P
+8V
C117
105
C118
102
C119
102
R126
1K
R127
1K
R129
10K
R130
4K7
R131
33K
C121
102
VS
BLK R G B HS VS CHRDMA
AFT
C5V
C122
103
C123
103
C124
103
VER
1
2
3
P5
3V GND VOL ANT
D3
IN5819
C29
104
C22
104 C23 104 C24 104 C25 104
C26
104
Vin 1
GND
2
Vout
3
IC3
78L05
C31
470uF
C28
100uF R40
47
R36
10K
R37
1K
R38
1K
R39
10K
Q5
D1203
FU2
C32
220uF
C35
683
L1
100uH
R47
4K7
C34
22P/3KV
1
2
P3
1 2 3 4 5
6 7 8
IC4
C33
104
C74
103
C30
102
R42
680K R43
36K
R44
6K8
R45
2K2 R46
100K
R41
180K
R94
100
R96
22K
R99
2K2
VR1
1K
C61
10uF
C64
100uF
C27
220uF
L3
D10
IN5819
D8
IN4937
D9
IN4937
D4
IN5819 D7
IN4937
D6
IN5819
C58
100uF
L2
100uH
L4
100uH
L5
100uH
C66
104 C129
104
C77
104
C55
104 C125
104 C126
104
C127
104
C62
104
C72
104 C69 104 C73 104 C136 104 C137 104
C78
104 C79 104 C140
104
C141
104
C190
104
C191
104 C192 104 C189
104 C195
104 C196
104 C202
104 C203
104
C204
104
C54
220uF
C57
100uF C56
100uF
C63
47uF/25V C128
100uF
C75
10uF
C76
100uF
C81
220uF
C71
220uF
C70
22uF/50V
C67
22uF/50V
C80
22uF/50V
R93
10K
R97
2K7
ZD2
17V
ZD3
33V
C188
22uF/50V C194
22uF/50V
Vin
1
GND
2
Vout 3
IC16
LM3480
VCC
VCC1
5V 5V
5V
+5V
+17V
+17V
+8V
+7V-15V
-15V
+12V
C52
103
C5V
1 2 3 4 5
6 7 8
IC13
R214
8K2
R167
5K6
R169
1K
R170
10K
R172
100
R173
10K
R229
20K
VR3
10K
VR4
30K
C168
47uF
C171
10P
C172
10uF
C193
104
C166
104
C167
10P
VCOM
EOLS
VGL
AVDD VEE VGH
+33V
VCC
C160
104 C161
104
VCC VCC1
C185
102
R160
15K R161
47K
R162
20K
R163
10K
R165
10K
R187
39K
R188
10K
R189
200K
R190
15K R191
10K R192
10K R193
560
Q17
C186
104
R200
39
R203
560
R207
560
R209
560
R210
560
C165
1uF
R199
1K
C210
10P
R194
10K R195
560 R196
560 R197
560 R238
150
VR5
5K
VCC C184
100P
VCC1
VS
HSY
NPO
OBLK
POLC FRP
EOLS
PSC
PSI
OMCLK
VCC
VIY
CSY
MM
MM U/D L/R INH Q2H STHL STHR
CPH3 CPH2 CPH1
C197
702
C198
103
C199
360P
C200
102
C201
102
LT3
14.5uH
R237
15K
R239
20K
R240
560
R241
1K
R242
100K
R243
560
R244
560
R245
560
R246
560
R249
10K
R219
10K R222
10K R223
10K
VCC
AVDD
PDA
CPV
DIO1
DIO2
XOE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
CON1
28PIN
R231
10K
R232
10K
R233
150
R234
150
GND
VGH
VCC
GND
VEE
VGL
DIO1
DIO2
U/D
CPV
XOE
VCOM
VCOM
L/R
INH
Q2H
STHL
CPH1
CPH3
CPH2
VCC
GND
VR
VG
VB
AVDD
AVDD
GND
STHR
AV2
POWER
HT-TR350LA
R84
1K
R88
1K
R90
100
R92
75
AUDIO
VIDEO
VEE
VCC
+12V VOR Vi
R133
1K
R135
220
C5V
C5V
RO
GO
BO
CSY
PSI
FRP
VB VRVG
BRG
SYNC
SYNC
VOL
Vi
AVDD
AV2
C211
222
VR2
5K
Q14
C1815
Q15
Q16
Q11
C1815
Q3
C1815
Q4
C1815
Q7
DK
Q8
DK
Q12
AB29Z
Q1
C1815
Q9
R7
1K
C45
104 C46 104
R168
10K
R171
10K
R174
10K
R164
10K
AVDD U/D L/R
R198
10K R201
3K3 R204
3K3
R205
2K2
R202
10K
Q20
C1815
Q19
C1815
PT4
PT3
C213
1uF
C212
10uF
C206
102
R98
4K7
R253
4K7
R254
1K
R21
4K7
R22
1K5
R24
2K7
R26
3K9
R28
4K7
R30
8K2
R33
27K
R35
180K
SK1
POWER
SK2
TV/AV
SK3
MENUV
SK4
VOL-
SK5
VOL+
SK6
CH-
SK7
CH+
LED1
VCC 3
GND 2
IR 1
IC2
REMOTE
C17
104
1 2 3 4
P2
IR C5V KEY GND
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16
IC11
C130
220P
C131
25P
C132
470P
C133
82P
C134
104 C135
330P
C138
392
C139
473
C142
180P
C143
202
C144
473 C145
332
C146
104
C169
104
C147
202
SK8
SCAN
SK9
RESET
L7
6T
L8
7T
CD1
C170
100uF
LED2
R256
1K
R166
1K
R136
6K8
R137
33K
D5
IN4148
1
2
3
4
P6
3V GND VOL ANT
收音机
R132
4K7
R218
1K
HS
R261
100
R260
100 ZD5
3V9
Q25
C1815
C220
10uF
5V
1
2
3
45
6
7
8
IC17
R54
0.22
R56
180
R58
1K2 R95
18K
R208
2K
L9
100uH
C59
102
D12
IN4937
DC2
12ViN C10
100uF
C42
100uF R206
3K
P8
Vo
P7
GND
Q6
B772
R211
2K
R212
1K R213
18K2
R217
3K9
R215
820
LED3
D13
IN4007
R216
1M
电池盒充电板
1
2
3
U2
431
R220
2K
D14
IN5819
VK1
SS-12D01
C68
1uF
C65
221
R221
27K
Q10
C1815
+5V
+5V R224
10K
1
2
3
45
6
7
8
IC18