Onkyo TXSR 8450 Service Manual
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Extracted text from Onkyo TXSR 8450 Service Manual (Ocr-read)
Page 1
TX-SR504/504E/8450
Ref. No. 3927
ONKYO SERVICE MANUAL 2"
AV RECEIVER
MODEL TX-S R504
MODEL TX-SR504E
MODEL TX-S R8450
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TX-SR504 Black, Silver and Golden models
B MDD, B MDC, S MDC 120V AC, 60Hz
B MWT, S MWT, G MWT 120/220-240V AC, 50/60Hz
G MGR, G MGQ, G MGK 220-230V AC, 50/60Hz
TX-SR504E Black and Silver models
I B MPP, s MPP l230-240V AC, 50Hz I
TX-SR8450 Golden models
I G MGR l220-230V AC, 50/60Hz I
FIG-647M
SAFETY-RELATED COMPONENT
WA R N I N G I I
COMPONENTS IDENTIFIED BY MARK A 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 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE To THE CUSTOMER.
ONKYO®
IMAGINATIVE SIGHT SI SOUND
Page 2
SERVICE PROCEDURE
1. Replacing the fuses
EE 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.
EE 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 8A-UL/T-233 252329GR l,
F901 or FUSE 8A-T/UL-ST2 252261GR l,
F901 FUSE 4A-SE-EAK 252077GR l,
F901 or FUSE 4A-SE-TL250V 252277GR l,
F901 FUSE 4A-SE-EAK 252077GR l,
F901 or FUSE 4A-SE-TL250V 252277GR l,
F901 FUSE 4A-SE-EAK 252077GR l,
F901 or FUSE 4A-SE-TL250V 252277GR l,
F902 FUSE 4A-SE-EAK 252077GR l,
F902 or FUSE 4A-SE-TL250V 252277GR l,
F903 FUSE 5A-UL/T-233 252326GR l,
F903 or FUSE 5A-T/UL»ST2 252258GR l,
F903 FUSE 2,5A-SE-EAK 252075GR l,
F903 or FUSE 2,5A-SE-TL250V 25227SGR l,
F903 FUSE 2,5A»SE-EAK 25207SGR l,
F903 or FUSE 2.5A-SE-TL250V 252275GR l,
F6901 FUSE lOA-UL/T-233 25233OGR l
F6901 or FUSE lOA-T/UL-ST2 25233SGR l
F6902 FUSE lOA-UL/T-233 252330GR l
F6902 or FUSE lOA-T/UL-ST2 252333GR l
2.To initialize the unit
1. Press and hold down VIDEO 1NCR 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
Main microprocessor Q701 only.
<8450> : TX-SR8450 Chinese model 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.
Ex.
Ver.1.01/05305€
2, Press STANDBY/ON button to power off.
4. 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.
Page 5
X-SR504/504E/8 0
OPERATION CHECK-3
CONTROL OF POWER SUPPLY (OUTPUT SENSOR AND THERMAL SENSOR)
[When]
1. Exchange power transistors (Q6050 - Q6056, Q6060 - Q6066).
2. Exchange power amplifier PC board ass'y (NAAF-8779).
3. Exchange thermal sensor PC board ass'y (NAETC-878l).
[Procedure]
No output. No input.
Output sensor
1. Press and hold down CD button, then press STANDBY/ON button while the unit is powered on.
" Test - 7 " is displayed only for 5 seconds.
Test -5
*i Blinks
2. Press VIDEO 3 button while " Test - 7 " is displayed.
The unit will be in the state of " Test-4-00 ".
Test - 4-00
3. Repeatedly press TONE+ button until " Test-4-36 " is displayed
T 9 st - 4 - 3 6
4. At this time, confirm that the red characters of " FM STEREO " is displayed
And, confirm that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds.
FM STEREO
Test - 4-36
5. Press TONE+ button and confirm that the red characters of FM STEREO " is displayed.
And, confirm that the relays RL6901 and RL6902 are turned off in 2 or 3 seconds.
FM STEREO
Test - 4-37
6. Press STANDBY/ON button.
Turn off
Clear ->
Thermal sensor
1. Press and hold downDlSPLAY button. then pressSTANDBY/ON button when the unit is powered on.
The microprocessor version will be displayed for 3 seconds.
Ver. 1.01/06222A
2. Press TONE button while the version is displayed.
T: 25°C/ 77°F
3. Confirm that the displayed temperature is within +/-20 C from the ambient temperature.
4. Press STANDBY/ON button.
Turn off
Clear ->
Page 59
IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-4
0201 : D707E001RFP250 (32 bit Floating-Point Digital Signal Processor)-4/7
TERMINAL DESCRIPTION (1/4)
SIGNAL NAME 5"? TYPE PULL GPIO DESCRIPTION
External Memory lnterlace (EMIF) Address and Control
EM,A[0] 91 O - N
EM,A[1] 89 O - N
EM7A[2] 88 O - N
EM7A[3] 86 O - N
EM7A[4] 84 O - N
EM7A[5] 83 O - N
EM7A[6] 80 O - N EMIF Address Bus
EM,A[7] 79 O - N
EM,A[B] 76 O - N
EM7A[9] 75 O - N
EM,A[10] 93 O - N
EM,A[11] 74 O - N
EM,BA[0] 96 O - N SDRAM Bank Address and Asynchronous Memory
EM,BA[1] 94 O - N Low-Order Address
m 97 O - N SDRAM Chip Select
W 100 O - N Asynchronous Memory Chip Select
m 37 O - N SDRAM Column Address Strobe
m 98 O - N SDRAM Row Address Strobe
W 38 O - N SDRAM Write Enable
EMicKE 71 O - N SDRAM Clock Enable
EMicLK 70 0 . N SDRAM Clock
EM7WE7DQM[0] 39 0 - N Write Enable or Byte Enable for EM,D[7:0]
EMifiioQMn] 67 o . N Write Enable or Byte Enable for EM,D[15:8]
m 104 o _ N SDRAM Output Enable
EMiRW 102 o _ N Asynchronous Memory Read/not Write
Page 87
TX-SR504/504E/8450
ADJUSTMENT PROCEDURE-2
IDLING CURRENT ADJUSTMENT
ii" i i I " ii
U01
AMPLIFIER PC BOARD
5% (NAAF-8779)
P6083 R6043 J R6044 P6085 R6045
Te_st Trimming . Trimming Te_st Trimming
pornt resistor resislor pomt resistor
R6040 _ R6041 _ 'D R6046
Trimming Trim_ming - Trimming "3+ Trimming
resistor - reSIs or t resistor
rests or P6086
Test
point