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TX-SR303/303E
Ref. No. 3862
042005
SERVICE MANUAL
AV RECEIVER
MODEL TX-SR303
MODEL TX-SR303E ON STANDBY
REMOTE MODE
RECEIVER DVD
TAPE/AMP
INPUT SELECTOR
1 2 3 CD
V1 V2 V3
4 5 6 MD
MULTI CH DVD
7 8 9 CDR
TAPE TUNER CD
+10 0 CLR
--/--- DIMMER SLEEP
TUNING / PRESET CH VOL
MASTER VOLUME DISC
TOP MENU MENU
STANDBY/ON
SP A / B MUTING
ENTER ENTER
STANDBY
RETURN SETUP
A SPEAKERS B TONE + STEREO LISTENING MODE DISPLAY DIGITAL INPUT DIMMER MEMORY TUNING MODE RETURN SETUP
CLEAR
LISTENING MODE
STEREO SURROUND
PHONES
MULTl CH DVD VIDEO 1/VCR VIDEO 2 VIDEO 3 TAPE TUNER CD AUDIO SUBTITLE RANDOM REPEAT
TEST TONE CH SEL LEVEL- LEVEL+
PLAY MODE
DISPLAY L NIGHT CINE FLTR
RC-605S
RC-605S
TX-SR303 Silver model
MDD 120V AC, 60Hz
TX-SR303E Silver model
MPP 230-240V AC, 50Hz
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 NUMBERS 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.
TX-SR303/303E
SPECIFICATION
Amplifier Section General
Power Output Power Supply North American: AC 120 V, 60 Hz
2 channel driven: North American: 65 W + 65 W European: AC 230-240 V, 50 Hz
(8 , 20Hz-20kHz, FTC) Power Consumption North American: 4.2 A
European: 90 W + 90 W (6 , 1kHz, DIN) European: 360 W
Dynamic Power 160 W + 160 W (3 , Front) Stand-by Power Consumption North American: 0.1 W
125 W + 125 W (4 , Front) European: 0.2 W
85 W + 85 W (8 , Front) Dimensions
THD (W x H x D) 435 x 150 x 369 mm
(Total Harmonic Distortion) 0.08% (Power Rated) 17-1/8" x 5-7/8" x 14-1/2"
Damping Factor 60 (Front, 1kHz, 8 ) Weight North American and European: 8.5 kg
Input Sensitivity and Impedance 200 mV/ 47 k (LINE) 18.7 lbs.
Output Level and Impedance 200 mV/ 470 (REC OUT)
Video Inputs
Frequency Response 10 Hz-100 kHz/ +1 dB-3 dB (Direct
Composite DVD, VIDEO1, VIDEO2, VIDEO3
mode)
Tone Control 10 dB, 50 Hz (BASS) Video Outputs
10 dB, 20 kHz (TREBLE) Composite MONITOR OUT, VIDEO1
Signal to Noise Ratio 100 dB (LINE IHF-A) Audio Inputs
Speaker Impedance 6 -16 Digital Inputs Optical: 1
Video Section Coaxial: 1
Input Sensitivity/Output Level Analog Inputs DVD(MULTICHANNEL), VIDEO1,
and Impedance 1 Vp-p /75 (Composite) VIDEO2, VIDEO3, TAPE, CD
Multichannel Inputs 6
Tuner Section Audio Outputs
Analog Outputs TAPE, VIDEO1
FM
Subwoofer Pre Outputs 1
Tuning Frequency Range North American: 87.5 MHz-107.9 MHz
Speaker Outputs SP-A (L, R, C, SL, SR) + SP-B (L, R)
European: 87.5 MHz-108.0 MHz
Phones 1
Usable Sensitivity Stereo: 17.2 dBf 2 V(75 IHF)
Mono: 11.2 dBf 1 V(75 IHF)
Signal to Noise Ratio Stereo: 70 dB (IHF-A) Specifications and features are subject to change without notice.
Mono: 76 dB (IHF-A)
THD Stereo: 0.3% (1kHz)
Mono: 0.2% (1kHz)
Frequency Response 30 Hz-15 kHz / 1 dB
Stereo Separation 45 dB (1kHz)
AM
Tuning Frequency Range North American: 530 kHz-1710 kHz
European: 531 kHz-1611 kHz
Usable Sensitivity 30 V
Signal to Noise Ratio 40 dB
THD 0.70%
TX-SR303/303E
SERVICE PROCEDURE
1. Replacing the fuses
This symbol located near the fuse indicates that the
fuse used is show 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 utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu le present symbol est apposre.
REF NO. PART NAME DESCRIPTION PART NO. REMARKS
F901 FUSE 6.3A-UL/T-237 252166 !, : TX-SR303 USA model Only
F901 or FUSE 6.3A-T/UL-ST2 252260 !, : TX-SR303E European model Only
F902 FUSE 3.15A-SE-EAK FUSE 252076 !,
F902 or FUSE 3.15A-SE-TL250V 252242 !,
F902 or FUSE 3.15A-SE-TL250V 252276 !
F6901 FUSE 8A-UL 252198 !
F6901 or FUSE 8A-T/UL-ST2 252261 !
F6902 FUSE 8A-UL 252198 !
F6902 or FUSE 8A-T/UL-ST2 252261 !
2. Safety-check out
(Only U.S.A. model)
After correcting the original service problem perform the following safety check before releasing the set to the customer
Connect the insulating-resistance tester between the plug of power supply cord and terminal GND on the back panel.
Specifications: More than 10Mohm at 500V
3. To initialize the unit
1. Press and the hold down the VIDEO 1/VCR button , then press the STANDBY/ON button when the unit is Power on.
2. After " Clea r " is displayed, the preset memory and each mode stored in the memory, are initialized and will return to
the factory settings.
4. To check version of microprocessor
Main microprocessor Q701 only.
1. Press and the hold down the DISPLAY button , then press the STANDBY/ON button when the unit is Power on.
Version is displayed on FL display only for 3 seconds.
Ex.
V er.0.5 0 /05131a
2. Press the STANDBY/ON button to Power off.
5. Memory Backup
The AV receiver uses a battery-less memory backup system in order to retain radio presets and other settings
when it's unplugged or in the case of a power failure.
Although no batteries are required, the AV receiver must be plugged into an AC outlet in order to charge the
backup system. Once it has been charged, the AV receiver will retain the settings for several weeks,
although this depends on the environment and will be shorter in humid climates.
TX-SR303/303E
OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)
[When]
1. Exchange power transistors (Q6050 - Q6064).
2. Exchange amplifier PC board ass'y (NAAF-8523).
[Procedure]
No load. No input.
1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
"Test - _" is displays it only for 5 seconds.
Test - _ Blinks
2. Press the VIDEO 3 button, while the character of "Test - _" is displayed.
Unit will be in the state of " Test-4-00 ".
Test - 4 -00
3. Repeatedly press TONE+ button until the character of " Test-4-21 " is displayed.
Test - 4 -21
Checking the operation starts automatically as follows.
Test - 4 -21
------- Front L ch Check
P rote ct OK
Test - 4 -22
------- Front R ch Check
P rote ct OK
Test - 4 -23
------- Center ch Check
P rote ct OK
Test - 4 -24
------- Surround L ch Check
P rote ct OK
Test - 4 -25
------- Surround R ch Check
P rote ct OK
P rote ct
If all channel are OK, the character of " Test - 4 - 35 " is displayed.
Test - 4 -35
4. Press the STANDBY/ON button.
Turn off
Cle a r
TX-SR303/303E
OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
[When]
1. Exchange power transistors (Q6050 - Q6064).
2. Exchange amplifier PC board ass'y (NAAF-8523).
[Procedure]
No input.
Do not check two or more channels at the same time.
Do not connect dummy load to speaker terminals fro seconds 2 or more.
1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
"Test - _" is displays it only for 5 seconds.
Test - _ Blinks
2. Press the VIDEO 3 button, while the character of "Test - _" is displayed.
Unit will be in the state of " Test-4-00 ".
Test - 4 -00
3. Repeatedly press TONE+ button until the character of " Test-4-35 " is displayed.
Test - 4 -35
4. Connect the Dummy load of 3 ohms to the Front Lch speakers terminal.
At this time, check the speaker relay is not turned off.
Test - 4 -35
5. Connect the dummy load of 1 ohm to the Front Lch speakers terminal.
At that time, you check the speaker relay is turned off and "Protect" is displayed.
P rote ct
Disconnect the dummy load at once when check the display of "Protect".
Test - 4 -35
6. Check other channels according to the same procedure.
7. Press the STANDBY/ON button.
Turn off
Clear
TX-SR303/303E
OPERATION CHECK-3
CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR)
[When]
1. Exchange power transistors (Q6050 - Q6064).
2. Exchange power amplifier PC board ass'y (NAAF-8523).
3. Exchange thermal sensor PC board ass'y (NAETC-8526).
[Procedure]
No output. No input.
Output sensor
1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
"Test - _" is displays it only for 5 seconds.
Test - _ Blinks
2. Press the VIDEO 3 button, while the character of "Test - _" is displayed.
Unit will be in the state of " Test-4-00 ".
Test - 4 -00
3. Repeatedly press TONE+ button until the character of " Test-4-37 " is displayed.
Test - 4 -37
4. Adjusts MASTER VOLUME to Max. position.
At this time, check the character of "FM STEREO" displayed.
And, check relay RL6901 and RL6902 are turned off in 2- 3 seconds.
FM STEREO
Test - 4 -37
5. Press the STANDBY/ON button.
Turn off
Cle a r
Thermal sensor
1. Press and hold down the DISPLAY button, then press the STANDBY button when the unit is power ON.
" V er . 0. 50 /0 5 1 3 1 a " is displays it only for 2 seconds.
V er. 0 .50/0 5 1 3 1 a
2. Press the TONE button, while the character of "Ver.0.50/05131a" is displayed.
T: 2 5 C/ 7 7 F
3. Check the displayed temperature is +/-20 C of the ambient temperatures.
4. Press STANDBY/ON button.
Turn off
Cle a r
TX-SR303/303E
OPERATION CHECK-4
DSP DEBUG MODE
Check the operation of the circuit around DSP by the display in this mode.
This information helps to pursue the faulty point.
To set in DSP debug mode
1. Press and hold down the DISPLAY button, then press the STANDBY button when the unit is power ON.
" V er . 0. 50 /0 5 1 3 1 a " is displays it only for 2 seconds.
V e r. 0.5 0 /0513 1 a
2. Press the DISPLAY button, while the character of "Ver.0.50/05131a" is displayed.
E 1 A 4 8 K 0 1 5 FF 2 3 o
To exit
Press STANDBY/ON button.
Content of display
1 2 3 4 5 6 7 8 9 10
--------- DIR --------- ------ MEMORY/DOWNLOAD ----- ------------------------- DSP ----------------------------------------
1 UNLOCK 6 AUTOBOOT DSP AB CODE 8 DSP Status
E = UNLOCK 0 = FLASH 00 = Power off 21 = DSP C HW Config set
= LOCK 1 = ab_ac3_pl2 01 = Power on wait 22 - 2A = DSP C SW Config set
2 = ab_dts_pl2 10 = DSP reset 3F = DSP C kick start
2 Digital Selecter 3 = ab_neo6 11 = DSP reset wait 40 = DSP AB App start
D = DIGITAL
4 = sgen_ab 12 = DSP AB boot ready 41 = DSP AB HW Config set
A = ANALOG
5 = ab_pl2fs 13 = DSP AB boot start 42 - 4B = DSP AB SW Config set
1 = COAX1
6 = ab_dts_6dol 14 = DSP AB boot AF = DSP ab kick start
2 = OOAX2
7 = ab_dts9624 15 = DSP C boot ready
3 = OPT1
8 = aac_pl2 16 = DSP C boot start
4 = OPT2
17 = DSP C boot
5 = OPT3
18 = DSP soft reset
7 = FRONT 7 AUTOBOOT DSP C CODE
20 = DSP C app start
0 = ac_dts9624
3 Sampling Frequency 1 = c_neo6
96 = 96kHz 2 = c_oos_no_sd 9 DSP Detect Format
48 = 48kHz 3 = c_oos 00 = Null 0B = DTS1
44 = 44kHz 4 = c_oob 01 = Dolby Digital 0C = DTS2
32 = 32kHz 5 = c_pl2 03 = Pause 0D = DTS3
-- = Not detect 6 = c_pl2xthx 04 = MPEG1 L1 1B = MPEG2 AAC1
7 = c_thx 05 = MPEG1 L23/ MPEG2 w/o 1C = MPEG2 AAC2
4 Pre Emphasis
8 = c_spsetup 06 = MPEG2 w/e 20 = Silent
K = OFF
9 = version 07 = MPEG2 AAC 22 = DTS CD
e = ON
08 = MPEG2 L1 23 = PCM
5 DIR Status 09 = MPEG2 L2/3
0 = ANALOG
1 = PCM 10 DSP Decode
2 = NOT_PCM o = Decode OK
3 = DATA x = Decode NG
4 = DTSCD -- = Analog in
5 = MCH
6 = NOT DECIED
TX-SR303/303E
A004
EXPLODED VIEWS-1 x 4 pcs.
A025
P901
A003
x 27 pcs.
A050 A051
A401 A014 x 6 pcs.
A028
U16
U02
A004
U17
A040 Refer to
A004 in
P101 x 3pcs EXPLODED VIEWS-2
U18
A004 A046 A048
F6901 x 4 pcs. A450
F6902 U09 A052
U15 A004
A045
U08
F901 U05 A025 A001
A025
A002
A023 x 13 pcs. P703
x 4 pcs.
U06
U11 U14 A004
x 2 pcs. A004 A413
A004 A004
x 3 pcs. A405
U13 A014 A030
A412
T901 U01
A011 A430
A003
x 2 pcs. A406
U03 A411
A010
A004
A055 U04
x 4 pcs.
A065
TX-SR303/303E
A056 A420
A016 x 8 pcs.
x 2 pcs. A003
A013 A015 x 3 pcs.
x 6 pcs. A004
x 3 pcs. x 8 pcs.
TX-SR303/303E
EXPLODED VIEWS-2
Q6050A
x10
A037
x10 Q6054
Q6064
Q6053
Q6063
Q6052
Q6062
Q6051
Q6061
Q6050
Q6060
TX-SR303/303E
TX-SR303/303E
A B C D
BLOCK DIAGRAM
AUDIO SECTION
TUNER UNIT
1
51
NJW1157
52
53 41 + 42
46
CD 8
54 43 + 44 45 8
48
55 47
-6dB 8
TAPE OUT 8
56
57 8
9
TAPE IN 58
2 59
8
9
27 4
VIDEO3 IN 29 Z2_L 25
60 3
28 26 8
30 Z2_R 2 MIX_L 9
61 27 MIX_R
+9.7dB
-6dB INVERT
62 8
9
NJU7311
63
VIDEO2 IN 21 12
RECOUT_L 7 VOLIN_SBL 8
64 23 9
25
65 22 RECOUT_R
17 22 VOLIN_SBR 8
VIDEO1 OUT 24 9
66 26 11
18
67
VIDEO1 IN SOURCE_L
10 5
3 68 SOURCE_R
19
9
24
6
23
69 20
L
ADRT+
ADLT+
ADRT-
ADLT-
8
FRONT 21
MCH_SW
70
DAC_SW
MCH_SR
MCH_CT
R
DAC_SR
MCH_SL
DAC_FR
DAC_CT
DAC_SL
DAC_FL
DVD
TAPE_OUT_R
TAPE_OUT_L
V2_OUT_R
(MULTI INPUT)
V2_OUT_L
71
L
SURR.
73
R
73
CENTER
74
SUBWOOFER
4
ADRT+
ADLT+
ADRT-
ADLT-
16
DIGITAL IN 15
14 2ch ADC
COAXIAL 13
LPF
LPF
LPF
LPF
LPF
RX0 49
36
37
35
34
32
33
31
30
28
48
43
OPTICAL RX2 47
46 DIR
45
44
42
5 50
8ch DAC
CS42518
TX-SR303/303E
E F G H
PHONES
POWER AMPLIFIER
+29dB
SPEAKERS
L
VOLUME
FRONT-A
80 +29dB
88 1 FL_PO
TONE R
81
89 2 FR_PO
TONE +29dB
CENTER
82
90 3 CT_PO
A
+29dB
87 +20.2dB
95 8 SW_PO L
A
SURROUND
83
91 4 SL_PO +29dB
R
84
92 5 SR_PO
85 L
93 6
PREOUT
SUBWOOFER FRONT-B
86
94 7
R
SPRLCS
SPRLF
Z2RL
HPIN
SBMUT
AMUT
4M Bit
FLASH ROM
MX29LV040
LPF
LPF
28
29
27
26
22
23
21
20
62 110 RI
63 109 INTERFACE RI
64 107
1 106
58 118 DSP
C 54 86 CS494003
134
81
80
To Microprocessor
TX-SR303/303E
A B C D
SCHEMATIC DIAGRAMS-1 TO NADG-8514
AUDIO INPUT SECTION
TUPACK_R
TUPACK_L
VIDEO4_R
NAAF-8523 (1/2)
VIDEO4_L
VLTNDAT
VLTNCLK
VLTNSTB
FSWDAT
FSWCLK
DAC_SBR
FSWSTB
DAC_FL
U05
MIC
AMPLIFIER PC BOARD
P5505 A_GND
1
FSWSTB
FSWCLK
FSWDAT
DAC_SBR
V1OUT_R
DAC_FR
TAPEOUT_R
Z2_R
4
R5581
R5583
R5582
5
220
220
220
DMIXR 7 10K
Q5503
6 R5591
10K
CK 16
DATA 17
NC 18
19
R7 20
21
R6 22
R5 23
24
R4 25
R3 26
27
R2 28
R1 29
VDD 30
R5590 470 1.2K
R_COM2
NJU7311AM
R_COM4
R_COM3
R_COM
330J C5590
Q5502