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T-405TX
Ref. No .
3680
SERVICE MANUAL
STEREO TUNER
MODEL T-405TX
R
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
ON THE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBER APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
SUPT
SUDT
Silver models
230V AC,50Hz
120V AC,60Hz
TUNING
T-405TX
MEMORY
TIMER
PRESET
CHARACTER
DISPLAY
FM MODE
CLEAR
STANDBY/ ON
ACCUCLOCK
FM STEREO TUNER
052001


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2. To initialize the unit
This device employs a microprocessor to perform various
functions and operations. If interference generated by an external
power supply, radio wave, or other electrical source results in
accident which causes the specified operations and functions to
operate abnormally.
To perform a result, please follow the procedure below.
1.Set the unit to the standby mode
2.Press and hold down the MEMORY button, then press the
DISPLAY button.
3.The segments of the F.L.tube light on and the unit is set to the
test mode.
4.'Clear' is displayed when the power switch is pressed in the
state of the test mode and the memory is cleared.
1. Replacing the fuse
This symbol located near the fuses indicates that the
fuse used is fast operating type. For continued protection against
fire hazard, replace with same type fuse. For fuse rating refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utlise est a rapide.
Pour une protection permanente, n'untiliser que fusibles de
meme type. Ce darnier est la qu le present symbol est
appse.
CIRCUIT NO.
PART NO.
DESCRIPTION
F901
252075
2.5A-SE-EAK,Fuse
FM
Tuning Range:
87.90 - 107.90 MHz, 200 kHz steps
(U.S. & Canadian models)
87.50 - 108.00 MHz, 50 kHz steps
(Ohter area models)
Usable Sensitivity:
Mono : 12.8 dBf 1.2 µV, 75 Ohms IHF
Stereo: 19.2 dBf 2.5 µV, 75 Ohms IHF
50dB Quieting Sensitivity:
Mono : 18.0 dBf 2.2 µV, 75 Ohms
Stereo: 38.0 dBf 22 µV, 75 Ohms
Capture Ratio : 1.5 dB
Image Rejection Ratio : 85 dB
IF Rejection Ratio : 90 dB
Signal-to-Noise Ratio :Mono: 73 dB IHF
Stereo: 66 dB IHF
Selectivity :50 dB DIN (±300 kHz, 40 kHz dev.)
AM Suppression Ratio :50 dB
Total Har monic Distortion : Mono: 0.5%
Stereo: 0.8%
Frequency Response :30 - 15,000 Hz (±1.5 dB)
Stereo Separation :40 dB at 1 kHz
30 dB at 70 - D 10,000 Hz
Output Level : 0.5 V (U.S.& Canadian models)
0.75 V (Other ar ea models)
Muting Level : 17.2 dBf 2.0 µV, 75 Ohms
AM
Tuning Range :
530 - 1,710 kHz, 10 kHz steps
Usable Sensitivity : 30 µV
Image Rejection Ratio :30 dB
IF Rejection Ratio : 40 dB
Signal-to-Noise Ratio : 40 dB
Total Harmonic Distortion : 0.8%
Output Level: 0.15 V
General
Power Supply :
AC 120 V, 60 Hz
AC 230-240 V, 50 Hz
Power Consumption : 9 W
Dimensions (W x H x D) :
205 x 76 x 279 mm
8-1/16" x 3" x 11"
Weight : 1.7 kg, 3.7 lbs.
AM reception is available only on the U.S. and Canadian
models.
Specifications and external appearance are subject to
change without notice as a result of product improvement.
SPECIFICATIONS
SERVICE PROCEDURES
T-405TX


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BLOCK DIAGRAM
FM
ANTENNA
TANK
CIRCUIT
TR1
RF AMP
TR2
MIXER
IFT
Q101.Q102
FM IF AMP
L101.L102
FM IF
TRANSFORMER
Q103
FM IF SYSTEM/MPX AND AM RADIO SYSTEM
LA1837
L103
L.P.F
Q105
MUTE
SWITCH
Q107
GATE
CIRCUIT
Q106
MUTE
SWITCH
L104
L.P.F
TR3
BUFFER
TR4
FM LOCAL
OSCILLATOR
Q174
FM+B
SWITCH
Q701
PLL SYNCHESIZER
AND CONTROLLER
LM7001
Q702.Q703
L.P.F
X701
7.2MHz
RESONATOR
Q901
REGLATOR
Q902
REGLATOR
T901
NPT-1102
P902
X751
4.19MHz
RESONATOR
Q753
RESET
Q752
F L TUBE
10-BT-167GK
Q754
BUFFER
49 SYS
OUT
46 SYS IN
RI
IN/OUT
DIDIGT
SEGMENT
41
D
A
T
A
40
CLK
39
PLL
23
SD
22
STEREO
24
SIG
17
34
35
27
28
12V
5.6V
-VP
F L TUBE
Right
Left
19
MUTE
54
3
1
2
15
11
8
FM
9
10
7
1
9
21
19
17
16
18
20
30
15
14
11
7
6
MUTE
OUT
STEREO
SIGNAL
A
U
T
O/MONO
R101
FM MUTE
LEVEL
TUNED
CIRCUIT
T-405TX


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REF.NO.
PART NO.
DESCRIPTION
U1
1A907530-4C
NARF-6130-4C,Main circuit PC board ass'y <P>
1A907530-4D
NARF-6130-4D,Main circuit PC board ass'y <D>
U2
1A907531-4C
NADIS-6131-4C,Display PC board ass'y <P>
1A907531-4D
NADIS-6131-4D,Display PC board ass'y <D>
U3
1A907533-4C
NAPS-6133-4C,Power Transformer PC board ass'y <P>
1A907533-4D
NAPS-6133-4D,Power Transformer PC board ass'y <D>
T901
2300636
NPT-1102D,Power transformer <D>
2300637
NPT-1102P,Power transformer <P>
F901
252075
2.5A-SE-EAK,Fuse <P>
P901
253193HIT
AS-CEE,Power supply cord <P>
253277MIL
AS-UC-2#18,Power supply cord <D>
1
27100337
Chassis
2
27111039B
Front bracket
3
27122847
Rear panel <P>
27122848
Rear panel <D>
4
27141695A
T,Retainer
5
27175323
Leg
6
27190524
KGLS-14RF,Holder
7
27212313
Front panel
8
27300750
Bushing
9
28135247Y
Badge
10
28184705-1
Cover
11
28191800C
Clear plate
12
838130088
3TTB+8B,Self tapping screw
13
838430088
3TTB+8B(BC),Self tapping screw
14
838930088
3TTB+8B(UN),Self tapping screw
REF.NO.
PART NO.
DESCRIPTION
U1
U2
U3
F901
P901
T901
EXPLODED VIEW
NOTE : TH E COMPONENTS ID ENTI FIED BY MARK
ARE CRITICAL FOR RI SK OF FI RE AND
ELE CTRIC SHOCK . REPLACE ONLY WITH
PART NU MBER SPECIFIED.
NOTE :
<P> 230V model only
<D> 120V model only
T-405TX


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T-405TX
SCHEMATIC DIAGRAM
P10
P11
P12
P13
P14
P15
P16
P17
1G
2G
3G
4G
5G
6G
7G
8G
9G
10G
F2
F2
Q752
10-BT-167GK
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
3G
2G
1G
P17
P16
P15
P14
P13
P12
-VP
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
GND
GND
GND
GND
GND
GND
GND
VDD3
GND
GND
SYSOUT
GND
GND
SYSIN
POFF
RDSSCK
RDSSIG
RDSDATA
DATA
CLK
PLL
PCL
GND
GND
X2
X1
VSS
NC
GND
AVREF
AVDD
K0
K1
AREA
MODE SIG
SD
STEREO
GND
AVSS
MUT
GND
RESET
GND
POWER
GND
GND
GND
GND
GND
GND
VDD1
10G
9G
8G
7G
6G
5G
4G
Q751
MPD78044FGF-191
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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
C755
NTC-
45P27
P102
FM
75,OHM
VSS
PD2
PD1
VDD2
VDD1
FMIN
AMIN
AM/FM
MONO
AUTO
FMB
RDATA
RCLK
PLLCE
XIN
XOUT
Q701
LM7001J
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
S757
AUTO/MONO
S758
TIMER
S761
DISP
S760
CHARACT
S759
*
BAND
S756
POWER
S755
TU-DW
S754
P-DW
S753
P-UP
S751
MEMORY
S752
TU-UP
Q753
DTC144ES
C757
223Z
C756
CH220J
P101
FM
300,OHM
FM
75,OHM
GND
AM
T2
T1
VSS2
VDD2
XI
X0
T57
RCLK
CMP
VSS3
VSS1
VDD1
MUX
VREF
RDSDATA
QUAL
Q755
BU1922,ORBU1923
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D751
D701
D759
D754
D753
D752
D756
NMA-3057
X101
SFE10.7MA5
RED
X102
SFE10.7MA5
RED
X103
*
R002
680
R101
*
R102
*
R103
330
R104
*
R105
3.3K
R106
1K
R107
330
R108
330
C7
C8
C11
270
C3
270
C5
C6
100
C1
270
C2
150
C4
C21
223
C9
050
C10
221
C12
015
C19
150
C14
C15
100
C16
270
C17
220
C18
C13
470
C22
223
C28
223
C760
561J
C701
CH150J
C702
CH150J
C762
CH330J
C761
CH330J
C759
223Z
C22
C1
220
C7
561
C5
C3
100
C2
050
C6
100
C17
103
C9
020
C26
103
C11
103
C13
330
C10
C15
060
C16
180
C24
103
C4
681
C19
680
C21
101
C20
270
C18
103
C12
150
C14
220
C8
470
C703
101J
C704
101J
C705
101J
C707
223Z
C101
223Z
C102
223Z
C103
223Z
TR1
2SC2714
TR3 2SC
2715
TR2
2SC
2996
TR3
TR4
TR2
Q703
2SC
1740
-R
Q101
*
Q102
2SC1923-O
R1
33K
R6
33K
R5
33K
R15
R10
100
R2
100K
R3
100K
R4
R7
R8
R16
R13
10K
R12
10K
R14
330
R17
330
R11
10K
R769
47K
R705
2.2K
R109
10
R774
220
R773
220
R775
220
R767
1K
R766
820
R765
470
R764
390
R701
1K
R702
1K
R703
1K
R770
220K
R704
1K
R004
22
R2
33
R4
330K
R11
68
R5
100K
R9
2.2K
R8
180
R7 100K
R10
270
R6
4.7K
R3
10K
R707
3.9K
R706
10K
R710
22
R709
330
R708
1M
R003
100
R001
22
R776
10K
R758
390
R762
1.8K
R761
1K
R760
820
R759
470
R763
2.7K
R756
*
R754
*
R755
*
R753
*
100K*11
R768
R752
10K
R751
1K
R777
10K
R757
2.7K
IFT
IFT
C710
2.2/50
C001
100/16
C758
2.2/50
C763
C754
10/16
C711
0.22/50
C002
10/16
C712
10/16
C706 100/6.3
C753
2.2
/50
C751
0.1/5.5
TP701
C752
474J
C709
333J
D1
D2
D3
D4
D1
D2
X752
AF6146CG
X701
XTL-
7.2M
X751
XTL-4.19M
Q754
DTA124ES
Q704
DTA114ES
FET
2SK302
TR1
2SK360
Q702
2SK
365GR
5
VT
8
OSC
6
+B
4
E
7
IF
2
E
1
ANT
4
VT
1
IF
2
E
5
+B
3
OSC
6
E
8
ANT
7
ANT
L7
L1
L2
L5
L4
L3
L6
L5
L2
2.2
L4
L3
L6
L1
L7
D757
MTZJ5.6B
PLL
CLK
DATA
CLOCK
PLL
SIG
SD
STEREO
MUT
RDSSCK
RDSSIG
RDSDATA
DATA
RDSDATA
RDSSIG
RDSSCK
RI
10G
9G
8G
7G
6G
5G
4G
10G
9G
8G
7G
6G
5G
4G
3G
2G
1G
P17
P16
P15
P14
P13
P12
P11
P10
P9
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
P17
1G
2G
3G
*U J J
U D D
O T H E R
R753
1K
1K
NO
R754
NO
NO
10K
R755
1 K
N O
390
R756
NO
10K
2 .7K
S759
YES
YES
NO
*
U JJTYPE
OTHERTYPE
R101
33K
3 .3K
R102
6.2K
1K
R104
620
3 30
X103
SFE-10.7MA5,RED
S FE10.7MZ2K
Q101
2SC945A-P
2SC1923-O
NADIS-6131
NARF-6130
OTHERTYPETU001,FE417-G02
EXCEPTUJJTYPE
UJJTYPETU001,TFFJ2J546A