Onkyo HTR 640 Service Manual
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Extracted text from Onkyo HTR 640 Service Manual (Ocr-read)
Page 1
Ref.No.3951
ON KYO SERVICE MANUAL
AV RECEIVER
MODEL HT-R640
RC-668M(MDD)
RC-669M(MPP)
HT-R640 Black, Silver models
B MDD
120V AC, 60HZ
S MPP
230-240V AC, SOHZ
SAFETY-RELATED COMPONENT
WARNING! !
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 ()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
082006
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 {use rating, refer to
the marking adjacent to the symbol.
EE Ce symbole indique que 1e fusible utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu 1e present symbol est apposre.
REF NO. PART NAME DESCRIPTION PART NO. REMARKS
F901 FUSE 10A-UL/T-233 25233OGR !,
F901 or FUSE 10A-T/ULAST2 252333611 !,
F901 FUSE 5A~SE~EAK 25207SGR I,
F901 or FUSE 5A-SETL250V 25227SGR !,
F903 FUSE 5A-UL/T-233 252326GR 1,
F903 or FUSE SA-T/UL~ST2 ZSZZSSGR !,
F903 FUSE 2.5A-SEEAK 252075GR 1.
F903 or FUSE 2.5A-SE-TL250V 25227SGR I,
F910 FUSE 5A-UL/T-233 252326GR !
F910 or FUSE 5A-T/UL-ST2 252258GR !
F6901 FUSE 12AATULA250V 252301GR !
F6902 FUSE 12A-TUL~250V 252301GR
2. To initialize the unit
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 " 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 the version of microprocessor
Main microprocessor Q70] 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.
Ex.
Main1.01/05305A
2. Press the 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 ufa 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.