TX-SR303/303E
SERVICE MANUAL
SERVICE MANUAL
TX-SR303 Silver model
Ref. No. 3862
042005
AV RECEIVER
120V AC, 60Hz
MDD
TX-SR303E Silver model
230-240V AC, 50Hz
MPP
MODEL
TX-SR303
MODEL
TX-SR303E
RC-605S
TONE
+
STEREO
LISTENING MODE
DISPLAY DIGITAL INPUT
DIMMER
MEMORY TUNING MODE
RETURN
TUNING / PRESET
ENTER
SETUP
STANDBY
STANDBY/ON
CLEAR
PHONES
MULTl CH
DVD
VIDEO 1/VCR
VIDEO 2
VIDEO 3
TAPE
TUNER
CD
MASTER VOLUME
A SPEAKERS B
MUTING
MENU
TOP MENU
SP A / B
SETUP
RETURN
RANDOM
SUBTITLE
PLAY MODE
AUDIO
REPEAT
RC-
605S
--/---
TAPE/AMP
ON
STANDBY
DIMMER
SLEEP
INPUT SELECTOR
REMOTE MODE
V
1
V
2
V
3
CD
TAPE
TUNER
DVD
MULTI CH
LISTENING MODE
DISPLAY
TEST TONE
CH SEL
SURROUND
STEREO
CINE FLTR
LEVEL+
LEVEL-
L NIGHT
VOL
CDR
MD
DVD
RECEIVER
CD
+10
0
CLR
12
3
45
6
789
ENTER
CH
DISC
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
Audio Outputs
Analog Outputs
TAPE, VIDEO1
Subwoofer Pre Outputs
1
Speaker Outputs
SP-A (L, R, C, SL, SR) + SP-B (L, R)
Phones
1
Specifications and features are subject to change without notice.
Power Supply
North American: AC 120 V, 60 Hz
European: AC 230-240 V, 50 Hz
Power Consumption
North American: 4.2 A
European: 360 W
Stand-by Power Consumption
North American: 0.1 W
European: 0.2 W
Dimensions
(W x H x D)
435 x 150 x 369 mm
17-1/8" x 5-7/8" x 14-1/2"
Weight
North American and European: 8.5 kg
18.7 lbs.
Video Outputs
Composite
MONITOR OUT, VIDEO1
Audio Inputs
Digital Inputs
Optical: 1
Coaxial: 1
Analog Inputs
DVD(MULTICHANNEL), VIDEO1,
VIDEO2, VIDEO3, TAPE, CD
Multichannel Inputs
6
General
Power Output
2 channel driven:
North American: 65 W + 65 W
(8 , 20Hz-20kHz, FTC)
European: 90 W + 90 W (6 , 1kHz, DIN)
Dynamic Power
160 W + 160 W (3 , Front)
125 W + 125 W (4 , Front)
85 W + 85 W (8 , Front)
THD
(Total Harmonic Distortion)
0.08% (Power Rated)
Damping Factor
60 (Front, 1kHz, 8 )
Input Sensitivity and Impedance 200 mV/ 47 k
(LINE)
Output Level and Impedance
200 mV/ 470
(REC OUT)
Frequency Response
10 Hz-100 kHz/ +1 dB-3 dB (Direct
mode)
Tone Control
10 dB, 50 Hz (BASS)
10 dB, 20 kHz (TREBLE)
Signal to Noise Ratio
100 dB (LINE IHF-A)
Speaker Impedance
6
-16
Amplifier Section
Input Sensitivity/Output Level
and Impedance
1 Vp-p /75
(Composite)
Video Section
FM
Tuning Frequency Range
North American: 87.5 MHz-107.9 MHz
European: 87.5 MHz-108.0 MHz
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)
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%
Tuner Section
Video Inputs
Composite
DVD, VIDEO1, VIDEO2, VIDEO3
SERVICE PROCEDURE
TX-SR303/303E
1. Replacing the fuses
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
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.
3. To initialize the unit
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.
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 " Clear " is displayed, the preset memory and each mode stored in the memory, are initialized and will return to
the factory settings.
5. Memory Backup
<Note>
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.
2. Press the STANDBY/ON button to Power off.
4. To check version of microprocessor
Ver.0.50/05131a
Ex.
REF NO.
F901
F901 or
F902
F902 or
F902 or
F6901
F6901 or
F6902
F6902 or
PART NAME
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
DESCRIPTION
6.3A-UL/T-237
6.3A-T/UL-ST2
3.15A-SE-EAK FUSE
3.15A-SE-TL250V
3.15A-SE-TL250V
8A-UL
8A-T/UL-ST2
8A-UL
8A-T/UL-ST2
PART NO.
252166
252260
252076
252242
252276
252198
252261
252198
252261
REMARKS
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<Notes>
<DD> : TX-SR303 USA model Only
<PP> : TX-SR303E European model Only
OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)
TX-SR303/303E
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.
2. Press the VIDEO 3 button, while the character of "Test - _" is displayed.
Unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE
+ button until the character of " Test-4-21 " is displayed.
[Procedure]
<Note>
No load. No input.
Test - _
Test - 4-00
[When]
1. Exchange power transistors (Q6050 - Q6064).
2. Exchange amplifier PC board ass'y (NAAF-8523).
Test - 4-21
Checking the operation starts automatically as follows.
Test - 4-21
Test - 4-22
Test - 4-25
Test - 4-23
Test - 4-24
Protect OK
Protect OK
Protect
Protect OK
Protect OK
Protect OK
Test - 4-35
Clear
Turn off
------- Front L ch Check
If all channel are OK, the character of " Test - 4 - 35 " is displayed.
4. Press the STANDBY/ON button.
------- Front R ch Check
------- Center ch Check
------- Surround L ch Check
------- Surround R ch Check
Blinks
OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
TX-SR303/303E
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.
2. Press the VIDEO 3 button, while the character of "Test - _" is displayed.
Unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE
+ button until the character of " Test-4-35 " is displayed.
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.
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.
Disconnect the dummy load at once when check the display of "Protect".
6. Check other channels according to the same procedure.
[Procedure]
<Note>
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.
Test - _
Test - 4-00
[When]
1. Exchange power transistors (Q6050 - Q6064).
2. Exchange amplifier PC board ass'y (NAAF-8523).
Test - 4-35
Clear
Turn off
7. Press the STANDBY/ON button.
Test - 4-35
Protect
Test - 4-35
Blinks