Onkyo HT-R640, Service Manual

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HT-R640
SERVICE PROCEDURE
1. Replacing the fuses
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.
2. 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 hold down the
VIDEO 1/VCR 1
button, then press the
STANDBY/ON
button when the unit is Power on.
2. After " C l e a r " is displayed, the preset memory and each mode stored in the memory are initialized and will return to
the factory settings.
4. Memory Backup
Main microprocessor Q701 only.
1. Press and hold down the
DISPLAY button , then press the STANDBY/ON button when the unit is Power on.
The version is displayed on FL display for
3
seconds.
2. Press the
STANDBY/ON
button to Power off.
3. To check the version of microprocessor
M a i n 1 . 0 1 / 0 5 3 0 5 A
Ex.
REF NO. PART NAME DESCRIPTION PART NO. REMARKS
F901 FUSE 10A-UL/T-233 252330GR !, <DD>
F901 or FUSE 10A-T/UL-ST2 252333GR !, <DD>
F901 or FUSE 5A-SE-TL250V 252278GR !, <PP>
F910 FUSE 5A-UL/T-233 252326GR !
F910 or FUSE 5A-T/UL-ST2 252258GR !
F6901 FUSE 12A-TUL-250V 252301GR !
F6902 FUSE 12A-TUL-250V 252301GR !
<Notes>
<PP> : HT-R640 European model
<DD>
: HT-R640 USA model
F901 FUSE 5A-SE-EAK 252078GR !, <PP>
F903 FUSE 2.5A-SE-EAK 252075GR !, <PP>
F903 FUSE 5A-UL/T-233 252326GR
!, <DD>
F903 or FUSE 2.5A-SE-TL250V 252275GR !, <PP>
F903 or FUSE 5A-T/UL-ST2 252258GR !, <DD>
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