Onkyo HTRC 270 Service Manual

Page 1

HT-RC270

Ref. No. 4214

ONKYO SERVICE MANUAL 2°

AV RECEIVER
MODEL HT-RC270(B)

cum

Black model RC-768M

B MDC 120V AC, 60Hz

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 OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

ONKYOQ

IMAGINATIVE SIGHT & SOUND

Page 2

SERVICE PROCEDURE-1

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 utilis 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.

HT-RC270

REF NO. PART NAME DESCRIPTION PART NO. REMARKS
F2000 FUSE 4A-UL/T-233 252325012 1
F2000 or FUSE 4A-T/ULAST2 252257012 1
F2001 FUSE 2A-UL/T»233 252320012 1
F2001 or FUSE 2A-T/UL-ST2 252253012 1
F6901 FUSE 15AATUL-250V 252303012 1
F6901 or FUSE ISAFUL/Ti3l4 252197012 1
F6902 FUSE 15A7TUL-250V 252303012 1
F6902 or FUSE ISAFUL/Ti3l4 252197012 1
F901 FUSE 10A~ULFST6 N1 25238ZGR 1
2. Safety check out

(U.S.A. model only)
After correcting the original service problem, perform the following safety check before releasing the unit to the customer.
Leakage current Check
Measure the leakage current to a known earth ground (water pipe or conduct etc.) by connecting a leakage current

tester between the earth ground and exposed metal parts of the unit (input/output ground terminals, screw heads or metal overlays etc.).
Plug the power supply cord directly into a 120Vac 60Hz wall socket and turn ON/STANDBY button on.

Any current measured must not exceed 0.5mA.

3. Memory Backup
This model uses a EE-PROM IC in order to retain radio presets and other settings. So, memory contents will be
kept etemally with no care.

4. To initialize the unit
1. ON/STANDBY (Power On)

2. VCR/DVR + ON/STANDBY.

Clear

-> Stand-by

Preset memory and each mode stored in the memory, are
initialized and will return to the factory settings.

ON/STANDBY VCR/DVR