Onkyo TXSR 403 Service Manual

Page 1

TX-SR403/8340

Ref. No. 3861

ONKYO SERVICE MANUAL °42°°5

AV RECEIVER

MODEL TX-S R403
MODEL TX-S R8340

\E/ \E/

TX-SR403 Silver and Golden model
5 MGR \ 220-230V AC, 50/60Hz \

RC-GOSS

\G MGR \ 220-230V AC, 50/60Hz \

TX-SR8340 Golden model
6 MGR \ 220-230V AC, 50/60Hz \

SAFETY-RELATED COMPONENT
WARNING! !

COMPONENTS IDENTIFIED BY MARK A ()N THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ()NKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.

MAKE LEAKAGE-CURRENT ()R RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

ONKYO.

IMAGINATIVE SIGHT & SOUND

Page 29

A l B
SCHEMATIC DIAGRAMS-7
DSPLAYSECHON

TX-SR403/8340

TX-SR303/8340

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Page 68

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-10
0201: CS494003CQZ (Mum-Standard Audio Decoder)-10/11

SD_BA, EXTRA19 --- SDRAM Bank Address Select, SRAM External Address Bus
SDRAM bank address select, SFtAM external address bus 19. OUTPUT

SD_CS --- SDRAM Chip select
SDRAM chip select. OUTPUT

SD_RAS SDRAM Row Address Strobe
SDRAM row address strobe. OUTPUT

SD_CAS SDRAM Column Address Strobe
SDRAM column address strobe. OUTPUT

SD_WE --- SDRAM Write Enable
SDRAM write enable. OUTPUT

SD_DQM1 --- SDRAM Data Mask 1
SDRAM data mask 1. OUTPUT

SD_DQMO SDRAM Data Mask 2
SDRAM data mask 0. OUTPUT

NV_CS, GPIO14 --- SFtAM Chip Select, General Purpose l/O

SRAM/FLASH chip select. This pin can act as a general-purpose input or output that can be
individually configured and controlled by DSPC. BlDlFlECT/ONAL - Default: OUTPUT

NV_OE, GPIO15 SRAM Output Enable, General Purpose l/O

SRAM/FLASH output enable. This pin can act as a general-purpose input or output that can
be individually configured and controlled by DSPC. BlD/FlECT/ONAL - Default: OUTPUT

NV_WE, GPI016 --- SRAM Write Enable, General Purpose l/O

SRAM/FLASH write enable. This pin can act as a general-purpose input or output that can be
individually configured and controlled by DSPC. BlDlFlECT/ONAL - Default: OUTPUT

UHSZ, CS_OUT, GPIO17 --- Mode Select Bit 2, External Serial Memory Chip Select,
General Purpose l/O

DSPC control port mode select bit 2. This pin is sampled at the rising edge of RESET and is
one of three pins used to select the control port mode. In serial control port mode, this pin can
serve as an output to provide the chip-select for a serial EEPROM. This pin can act as a
general-purpose input or output that can be individually configured and controlled by DSPC.
BlDIHECT/ONAL - Default: INPUT

TX-SR403/8340

Page 84

ADJUSTMENT PROCEDURE-1
IDLING CURRENT ADJUSTMENT

[When]
Exchange Power transistors (Q6051 7 Q6064) and Power amplifier PC board (NAAF48523).

[Procedure]
No load and No signal
Refer to l in "ADJUSTMENT PROCEDURESeZ about the adjustment points and the measuring points.
1. Before Idling adjustment, turn the trimming resistors to counter clockwise.
2. Connect the DC voltmeter to test points.
Connect 1007ohm resistance near the terminal of the two poles of a Jig terminal.

100 ohms Jig terminal Test point
1/4watts\@ ID
- a -* +
ID-

3. Connect the AC power cord to wall outlet.
4. Press the STANDBY/ON button into the power on.
5. Adjust the trimming resistors as following procedure immediately after power on.

DC voltmeter

?

Channel Mark Adjustment point Measuring point Adjustment value
(Trimming resistor) (Test point)
Left R6040 P6080 25 my
Right, E R6041 P6081 25 mV
Center R6042 P6082 25 mV
Surround Left R6043 P6083 1 _5 mV
Surround Right R6044 P6084 1 _5 mV
Surround Back Ifll R6045 P6085 1.5 mV

6. Wait for 4 » 6 minutes. (Heat running)
7. Re-adjust the trimming resistors as following procedure.

Channel Adjustment point Measured value Adjustment value Specifications
( * In a stable state)

Left, Right R6040, R604] and In case below 9 mV fl) 9 mV 12 +/» 3 mV
and Center R6042 In case 9 » 1 1 mV fl» Leave it as it is

In case over 11 mV -> 11 mV
Surround Left, R6043, R6044 and In case below 6 mV H 6 mV 9 +/7 3 mV
Surround Right and R6045 In case 6 - 8 mV -> Leave it as it is
Surround Back In case over 8 mV a 8 mV

8 Disconnect the DC voltmeter. >l< Idling current are stabilized in about

9. Press the STANDBY/ON button into the power off. 10 minutes after a power suPply (m'
10. Disconnect the AC power cord.