Onkyo TXSR 302 Service Manual

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R3

Ref. No. 3844

ONKYO SERVICE MANUAL 2°

AV RECEIVER
MODEL TX-SR302

omnro m x H. w

FIG-4798

Silver model

MDD, UDD 120V AC, 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 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 & SOUND

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SERVICE PROCEDURES

1. Replacing the fuses 5. Memory Preservation

a This symbol located near the fuse indicates that the This unit does not require memory preservation batteries.
. . . . . A built-in memory power backup system preserves the contents of
fuse used is show operating type, For continued protection against . . .
. . . memory during power failures and even when the power cord [5 unplugged.

fire hazard, replace With same type fuse, For fuse rating, refer to .

. . The power cord must be plugged in order to charge the backup system.
the marking adjacent to the symbol. . . . .

The memory preservation period after the unit has been turned off varies

a- Ce symbole indique que le fusible utilise est e lent. depending on climate and placement of the unit. On average, memory
Pour une protection permanente, n'utiliser que des fusibles de meme contents are protected over a PCIiOd Of a few weeks after the time the unit
type. Ce demier est indique la qu le present symbol est apposre. has been turned Off-

This period is shorter when the unit is exposed to a very humid climate.

REENO. DESCRIPTION PARTNO. REMARKS

F6901 SA-UL 252198 1
F6901 or 8A-T/UL-ST2 252261 !
F6902 SA-UL 252198 1
F6902 or 8A-T/UL-ST2 252261 !
F901 6.3A-UL/T-237 252166 1
F901 or 6.3A-T/UL-ST2 252260 1
F903 5A-UL/T-237 252164 1

v

F903 or 5A-T/UL-ST2 252258

2. Safety-check out

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

This device employs a microprocessor to perform various

functions and operations. If interference generated by an external
power supply, radio wave, or other electrical sauce results in accident
which causes the specified operations and functions to operate
abnormally.

To perform a result. please follow the procedure below.

1. Press and the hold down the VIDEO 1 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.

4. How to check version of microprocessor?
Main microprocessor Q7008
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.

Version 04212a

2. Press the STANDBY/ON button to Power Off.