Onkyo T-405-TX Service manual

R

SERVICE MANUAL

STEREO TUNER

MODEL T-405TX

T-405TX

Ref. No . 3680

052001

STANDBY/ON

ACCUCLOCK

FM STEREO TUNER

MEMORYTIMER

CLEAR

FM MODE

PRESET

TUNING

CHARACTERDISPLAY

T-405TX

Silver models

SUPT

SUDT

230V AC,50Hz

120V AC,60Hz

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
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.

SPECIFICATIONS

T-405TX

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 Harmonic 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.

SERVICE PROCEDURES

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

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.

252075 2.5A-SE-EAK,Fuse

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.

BLOCK DIAGRAM

T-405TX

FM

ANTENNA
TANK
CIRCUIT

TR1
RF AMP

RI
IN/OUT

TUNED
CIRCUIT

Q702.Q703
L.P.F

TR2
MIXER

TR4
FM LOCAL
OSCILLATOR

IFT

Q754
BUFFER

TR3
BUFFER

46 SYS IN

49 SYS
OUT

Q101.Q102
FM IF AMP

L101.L102
FM IF
TRANSFORMER

1

Q174
FM+B
SWITCH

FM

11

Q701
PLL SYNCHESIZER
AND CONTROLLER

15

LM7001

543

41 DATA

40 CLK

9

8

1

X701

7.2MHz
RESONATOR

39 PLL

L103
L.P.F

21 19

Q103
FM IF SYSTEM/MPX AND AM RADIO SYSTEM

LA1837

AUTO/MONO

3015

R101
FM MUTE
LEVEL

12V

5.6V

19 MUTE

L104
L.P.F

Q901
REGLATOR

Q902
REGLATOR

11

6

7

14

STEREO

SIGNAL

MUTE OUT

9

10

7

2

23 SD

22 STEREO

24 SIG

17

16

1820

-VP
F L TUBE

Q105
MUTE
SWITCH

Q107
GATE
CIRCUIT

Q106
MUTE
SWITCH

T901
NPT-1102

Right

Left

P902

DIDIGT

Q752
F L TUBE
10-BT-167GK

SEGMENT

17

Q753
RESET

34

35

X751

4.19MHz
RESONATOR

27

28

EXPLODED VIEW

P901

T-405TX

F901

U3

T901

U1

U2

REF.NO. PART NO. DESCRIPTION
U1 1A907530-4C

1A907530-4D

U2 1A907531-4C

1A907531-4D

U3 1A907533-4C

1A907533-4D

T901 2300636

2300637
F901 252075
P901 253193HIT

253277MIL

NOT E : THE COM PONEN TS ID ENTI

ARE CRI TICAL FOR RISK OF FI RE AN D

ELECT RIC SHOCK . RE PLACE ON LY WI TH

PART NUMBER SPECIF

NARF-6130-4C,Main circuit PC board ass'y <P>
NARF-6130-4D,Main circuit PC board ass'y <D>
NADIS-6131-4C,Display PC board ass'y <P>
NADIS-6131-4D,Display PC board ass'y <D>
NAPS-6133-4C,Power Transformer PC board ass'y <P>
NAPS-6133-4D,Power Transformer PC board ass'y <D>
NPT-1102D,Power transformer <D>
NPT-1102P,Power transformer <P>

2.5A-SE-EAK,Fuse <P>
AS-CEE,Power supply cord <P>
AS-UC-2#18,Power supply cord <D>

FIED

BY M ARK

IED.

NOTE : <P> 230V model only
<D> 120V model only

REF.NO. PART NO.
1 27100337

2 27111039B
3 27122847

27122848
4 27141695A
5 27175323
6 27190524
7 27212313
8 27300750
9 28135247Y
10 28184705-1
11 28191800C
12 838130088
13 838430088
14 838930088

DESCRIPTION
Chassis

Front bracket
Rear panel <P>
Rear panel <D>
T,Retainer
Leg
KGLS-14RF,Holder
Front panel
Bushing
Badge
Cover
Clear plate
3TTB+8B,Self tapping screw
3TTB+8B(BC),Self tapping screw
3TTB+8B(UN),Self tapping screw

SCHEMATIC DIAGRAM

P9

NARF-6130

NMA-3057

FM

300,OHM

FM

75,OHM

GND

AM

FM

75,OHM

P101

P102

UJJTYPETU001,TFFJ2J546A

7

ANT

8

ANT

6
E

OTHERTYPETU001,FE417-G02

1

ANT

2
E

680

C1
270C2150

L1

2SK360

C20
270

L1

L7

C19

C21

101

C22C1220

C18

103

R3

10K

VT

4

L2

C4

D1

R1

33K

C5

C3

270

C28

223

5 VT

TR1

FET

2SK302

C6

100

R2

100K

C2

R2
33

050

2.2
L2

L3

C3

C4

C26

681

R6

D2

4.7K

C11

103

R4

L4

L3

R3

C7

100K

C21

223

R10
100

R11

C13

T-405TX

* UJJTYPE OTHERTYPE

R101 33K 3.3K
R102 6.2K 1K
R104 620 330
X103 SFE-10.7MA5,RED SFE10.7MZ2K

R710

R706

C710

2.2/50
Q702
2SK

365GR

22

10K

Q101 2SC945A-P

*

R101

*

Q101

*

*

R102

1K

R704
C709
333J

R705

2.2K

R708

1M

330

R709

R103

R104

X701
XTL-

7.2M

R109

C711 0.22/50

10

680

R002

SFE10.7MA5

R707

3.9K

C712 10/16

Q703
2SC
1740

-R

X101

RED

C6

100

D1

C5

100

103

C12

L6

C10

150

C14

D2

D3

33K

R5

D4

10K

470

L4

R7100K

C13

220

330

33K

C8

R6

C22

C14

L7

TR2

IFT

100K

1

IF

2
E

C001

OSC

OSC

100/16

5

+B

3

7

IF

4
E

6

+B

8

R10
270

C17

TR3

103

68

R11

IFT

R8

R17

330
C19

150

2SC

TR3

2715

220

R4

330K

L5

C8

470

C7

561

103

C24

R5

R8

180

C9

C16

180

020

TR4

060

C15

R9

2.2K

C9

TR1

050

2SC2714

L5

L6

C11

270

R7

C10

221

C12

015

223

10K

R14

330

R12

R15

C15

2SC

TR2

100

2996

C18

10K

C16

C17

R16

270

R13

R004

22

R001

22

2SC1923-O

R105

330

3.3K
Q102

1K

R106

X102

RED

C702

C706

C707

15

PD2

XIN

CH150J

R701

R003

1K

R108

330

100

100/6.3

223Z

13

14
PD1

VDD2

Q701 LM7001J

RCLK

PLLCE

101J

C704

C703

R702

1K

PLL

CLK

C101

SFE10.7MA5

223Z

16

VSS

XOUT
1234567

C701

CH150J

R107

330

2SC1923-O

C102

12

VDD1

RDATA

101J

R703

1K

DATA

C103
223Z

223Z

*

X103

C002

10/16

D701

10

11

FMIN

AMIN

AM/FM

MONO

AUTO

FMB
89

Q704
DTA114ES

101J

C705

*UJJUDDOTHER

R753 1K 1K NO
R754 NO NO 10K
R755 1K NO 390
R756 NO 10K 2.7K
S759 YES YES

NADIS-6131

S760

CHARACT

R767

1K

DATA
RDSDATA
RDSSIG
RDSSCK

RI

S759
BAND

R766

820

R769

47K

Q754
DTA124ES

D756

R770
220K

D757

MTZJ5.6B

*

S758

S757
AUTO/MONO

TIMER

R765

R764

470

390

PLL

CLOCK

X751

XTL-4.19M

TP701

40
CLK

PLL

41

DATA

42

RDSDATA

43

RDSSIG

44

RDSSCK

45

POFF

46

SYSIN

47

GND

48

GND

49

SYSOUT

50

GND

51

GND

52

VDD3

53

GND

54

GND

55

GND

56

GND

57

GND

58

GND

59

GND
P1

60

P2

61

P3

62

P4

63

P5

64

656667686970717273747576777879

R768

100K*11

P6P7P8

C756

CH220J

X2

PCL

GND

GND

MPD78044FGF-191

P11

P10P9P8P7P6

P9

P10

P11

X1

Q751

-VP

C755
NTC­45P27

VSS

P12

P12

P13

R763

2.7K
R757

2.7K

NC

P13

S751

MEMORY

*

R756

*

R755

K0

K1

GND

AVDD

AVREF

P17

P16

P15

P14

1G2G3G

P14

P15

P16

P17

R758
390

*

252627282930313233343536373839

AREA

MODE

SIG

STEREO

GND

AVSS

MUT
GND

RESET

GND

POWER

GND
GND
GND
GND
GND
GND

VDD1

10G

3G2G1G
80

R754

*

SD

9G
8G
7G
6G
5G
4G

S752
TU-UP

R753

C754

10/16

24
23
22
21
20
19
18
17
16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

S753
P-UP

R760

R759

820

470

SIG

C757

C752

10G

9G
8G
7G
6G
5G
4G

S754
P-DW

SD

R777
10K

223Z

R761

474J

S755

TU-DW

1K

STEREO

R762

1.8K

MUT

R776

Q753
DTC144ES

D752

C751

0.1/5.5

S756

POWER

D759

10K

R752

10K

R751

C753

1K

2.2
/50

D751

F2
123456789

D753

10G

F2

9G8G7G6G5G4G3G2G1G

10G

D754

EXCEPTUJJTYPE

C762

CH330J

220

R775

X752

AF6146CG

13

14

15

16

R773

220

R774

220

10-BT-167GK

P17

RCLK

QUAL
1234567

P17

RDSSCK

RDSSIG

RDSDATA

Q752

1G2G3G4G5G6G7G8G9G

101112

13

1415161718192021222324252627282930313233343536

XI

X0

T57

Q755 BU1922,ORBU1923

MUX

VREF

RDSDATA

C758

2.2/50

C761
CH330J

C759

223Z

12

VDD2

VDD1

11

VSS2

VSS1

P16

P16

10

T2

T1

CMP

VSS3

8 9

C760

561J

C763

P10

P11

P12

P13

P14

P15

37

P15

P14

P13

P12

P11

P10

S761
DISP

NO