ONKYO TX-SR304 Service Manual

Cover page of ONKYO TX-SR304 Service Manual

Service Manual for ONKYO TX-SR304, downloadable as a PDF file.

We also have owner's manual to this model.

Manual details

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  • The manual has 76 pages
  • File size: 4.19 MB
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TX-SR304/304E
SERVICE MANUAL
SERVICE MANUAL
AV RECEIVER
MODEL
TX-SR304
MODEL
TX-SR304E
120V AC, 60Hz
120V AC, 60Hz
S MDD, B MDD
S MDC
Ref. No. 3925
032006
230-240V AC, 50Hz
230-240V AC, 50Hz
S MPP
S MPA, B MPA
TX-SR304 Silver and black models
TX-SR304E Silver and black models
RC-645S
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
PREVIOUS
MENU
GUIDE
TOP MENU
SP A / B
SETUP
RETURN
PLAYLIST
PLAYLIST
RANDOM
SUBTITLE
PLAY MODE
AUDIO
REPEAT
RC-
645S
--/---
TAPE
ON/STANDBY
DIMMER
SLEEP
INPUT SELECTOR
REMOTE MODE
V
1
V
2
V
3
CD
TA PE
TUNER
DVD
MULTI CH
LISTENING MODE
DISPLAY
TEST TONE
CH SEL
SURROUND
STEREO
CINE FLTR
LEVEL+
LEVEL-
L NIGHT
VOL
HDD
CDR
MD
DVD
RECEIVER
CD
+10
0
CLR
12
3
45
6
789
ENTER
CH
DISC
ALBUM
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.
background image
TX-SR304/304E
SERVICE MANUAL
SERVICE MANUAL
AV RECEIVER
MODEL
TX-SR304
MODEL
TX-SR304E
120V AC, 60Hz
120V AC, 60Hz
S MDD, B MDD
S MDC
Ref. No. 3925
032006
230-240V AC, 50Hz
230-240V AC, 50Hz
S MPP
S MPA, B MPA
TX-SR304 Silver and black models
TX-SR304E Silver and black models
RC-645S
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
PREVIOUS
MENU
GUIDE
TOP MENU
SP A / B
SETUP
RETURN
PLAYLIST
PLAYLIST
RANDOM
SUBTITLE
PLAY MODE
AUDIO
REPEAT
RC-
645S
--/---
TAPE
ON/STANDBY
DIMMER
SLEEP
INPUT SELECTOR
REMOTE MODE
V
1
V
2
V
3
CD
TA PE
TUNER
DVD
MULTI CH
LISTENING MODE
DISPLAY
TEST TONE
CH SEL
SURROUND
STEREO
CINE FLTR
LEVEL+
LEVEL-
L NIGHT
VOL
HDD
CDR
MD
DVD
RECEIVER
CD
+10
0
CLR
12
3
45
6
789
ENTER
CH
DISC
ALBUM
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.
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TX-SR304/304E
SERVICE PROCEDURE
1. Replacing the fuses
This symbol located near the fuse indicates that the
fuse used is slow 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 appose.
2. To initialize the unit
1. Press and hold down VIDEO 1 / VCR button, then press STANDBY/ON button when the unit is powered 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.
3. To check version of microprocessor
<Note> Main microprocessor Q701 only.
1. Press and hold down DISPLAY button, then press STANDBY/ON button when the unit is powered on.
The version will be displayed on FL display only for 3 seconds.
2. Press STANDBY/ON button to power off.
Ver.1.03/06Y28a
REF NO.
F901
F901 or
F902
F902 or
F6001
F6002
PART NAME
FUSE
FUSE
FUSE
FUSE
FUSE
FUSE
DESCRIPTION
8A-UL/T-233
8A-T/UL-ST2
4A-SE-EAK
4A-SE-TL250V
8A-T/UL-ST-2
8A-T/UL-ST-2
PART NO.
252329GR
252261GR
252077GR
252277GR
252261GR
252261GR
REMARKS
!, <DD, DC>
!, <DD, DC>
!, <PP, PA>
!, <PP, PA>
!
!
<Notes>
<DD> : USA model
<DC> : Canadian model
<PP> : European model
<PA> : Australian model
FL display
[Ex.]
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TX-SR304/304E
OPERATION CHECK-1
SPEAKER PROTECT-1 (DC VOLTAGE DETECTION)
1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
2. Press VIDEO 3 button while the characters of " Test - _ " are displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE+ button until the characters of " Test-4-19 " are displayed.
Check whether the operation starts and continues automatically as follows.
If all channels are OK, the characters of " Test-4-29 " are displayed.
[Procedure]
<Note> No load. No input.
Test - _
Test - 4-00
[When]
1. Exchange power IC (Q6001, Q6002).
2. Exchange amplifier PC board ass'y (NAAF-8745).
Test - 4-19
Test - 4-19
Test - 4-20
Test - 4-23
Test - 4-21
Test - 4-22
Protect OK
Protect OK
Protect OK
Protect OK
Protect OK
Test - 4-29
Clear
Turn off
Front L ch
Check
Front R ch
Check
Center ch
Check
Surround L ch
Check
Surround R ch
Check
Blinks
4. Press STANDBY/ON button.
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TX-SR304/304E
OPERATION CHECK-2
SPEAKER PROTECT-2 (CURRENT DETECTION)
1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.
" Test - _ " is displayed only for 5 seconds.
2. Press VIDEO 3 button, while " Test - _ " is displayed.
The unit will be in the state of " Test-4-00 ".
3. Repeatedly press TONE+button until " Test-4-29 " is displayed.
4. Connect the dummy load of 3 ohms to the Front L ch speaker terminals.
At this time, confirm that the speaker relay is not turned off.
5. Connect the dummy load of 1 ohm to the Front L ch speaker terminals.
At this time, confirm that the speaker relay is turned off and " Protect " is displayed.
Disconnect the dummy load immediately after checking the display of " Protect ".
6. Check other channels according to the same procedure as 4 and 5.
[Procedure]
<Note>
No input.
Do not check two or more channels at the same time.
Do not connect a dummy load to speaker terminal longer than 2 seconds.
Test - _
Test - 4-00
[When]
1. Exchange power IC (Q6001, Q6002).
2. Exchange amplifier PC board ass'y (NAAF-8745).
Test - 4-29
Clear
Turn off
7. Press the STANDBY/ON button.
Test - 4-29
Protect
Test - 4-29
Blinks
FL
FR
C
SL
SR
SW
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TX-SR304/304E
OPERATION CHECK-3
THERMAL SENSOR PROTECT
DEBUG MODE-1
Ver. 1.01/05Z28b
<Ex.>
<Ex.>
T: 25 C/ 77 F
Turn off
[Procedure]
<Note> No output. No input.
[When]
1. Exchange power IC (Q6001, Q6002).
2. Exchange power amplifier PC board ass'y (NAAF-8745).
1. Press and hold down DISPLAY button, then press STANDBY/ON button when the unit is powered on.
The microprocessor version will be displayed for 3 seconds.
4. Press STANDBY/ON button.
3. Confirm that the displayed temperature is within +/-20 C from the ambient temperature.
This debug mode will help in analysing digital audio no sound trouble.
Check information on FL display and the related devices or circuits.
For details of the digit number and information on FL display, refer to next page.
Symptom on Display
Cause
Check
"E" is displayed
No input signal to DIR
Related devices from digital input to Q301
Displayed freq. is different
from input signal freq.
No input signal to DIR
Related devices from digital input to Q301
Displayed format is different
from input signal format
No input signal to DIR
Related devices from digital input to Q301
Digit No. on FL
5
3
1
Displayed format is different
from input signal format
Input signal to DSP is no good
Related devices from Q301 to Q201
"x" is displayed
Interface between DSP and
Microprocessor is no good
Related devices from Q701 to Q201
This identifies IC which
outputs error
The IC outputs error to main
microprocessor
Q5001, Q201, Q301 & related devices
9
8
10
2. Press TONE button while the version is displayed.

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