Onkyo A 905 X Service Manual

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A-905X

Ref. No. 3630

ONKYO® SERVICE MANUAL 999

INTEGRATED AMPLIFIER
MODEL A-905X

Silver model

SUP, SUPT 230v AC. 50Hz
SUD, SUDT 71201597 60Hz

SAFETY-RELATED COMPONENT WARNINGII TABLE OF CONTENTS

COMPONENTS IDENTIFIED BY MARK A ON

THE SCHEMATIC DIAGRAM AND IN THE PARTS Specifications 1
LIST ARE CRITICAL EOR RISK OF FIRE AND Service guide 1
ELECTRIC SHOCK. REPLACE THESE COM» Adjustment procedures and confirmation 3
PONENTS WITH ONKYO PARTS WHOSE PARTS Exploded View 4
NUMBERS APPEAR AS SHOWN 1N THIS MANUAL Exploded view parts list 5
MAKE LEAKAGE'CURRENT 0R RESISTANCE Microprocessor connection diagram 6
5::ggLéRDEMEANRESS 121E DEZEZflQELYTHm-r Microprocessor terminal description 7
SULATED FROM THE SUPPLY CIRCUIT BEFORE 1C blOCk diagram 8
RETURNING THE APPLIANCE TO THE Printed circuit board parts list 9
CUSTOMER PC board view from bottom side 11
Schematic diagram 13

PC board view from bottom side 15

Schematic diagram 17

Index to parts and controls 19

Packing procedures 21

22

ONKYO® Packing View
IIIIIIIII IIIIMPIIIIIIIIS

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A-905X

SPECIFICATIONS

Power output
15 watts per channel, min RMS, at 8
ohms, both channels driven 1 kHz, with
no more than 0.2% T'HD
2 X 20 watts at 4 ohms,
1 kHz ODIN)
2 X 15 watts at 8 ohms,
1 kHz (DIN)
'lbtal harmonic distortion
0.2% at rated power

IM distortion
0.2% at rated power

Damping factor
30 at 8 ohms

Frequency and response
15 to 30,000 Hz 1 1 dB

Input sensitivity/impedance
TUNER/CD/LINE: 180 mV/50 kohms
TAPE PLAY:180 mV/SO kohms
MD PLAY: 180 mV/50 kohms

Output sensitivity/impedance
TAPE REC: 180 mV/2.2 kohms
MD REC: 180 mV/2.2 kohms

SERVICE GUIDE

Replacing the fuses

E This symbol located near the fuse indicates that the
fuse used is fast operating type. For continued protection against
fire hazard. replace with same type fuse. For fuse rating refer to
the marking adjacent to the symbol.

E- Ce symbole indique que le fusible utlise est a rapide.
Pour une protection permanente. n'utiliser que des fusibles de
meme type. Ce damier est indique la qu l'e present symbol est
oppose. /

Bass control
1- 8 dB at 50 Hz

Treble control
1 8 dB at 10,000 Hz

Acoustic Presence
1: +3 dB at 20.5 Hz, +3 dB at 82 Hz
2: +3 dB at 20.5 Hz, +6 dB at 82 Hz

Signal to noise ratio (IHF-A)
CD/IAPE: 100 dB

Mutlng
-5 0 d B

General

Power supply
AC 230V, 50Hz
AC 120V, 60Hz

Dimensions
205 X 91 x 302 mm
(WidthX Height X Depth)

Weight
3.4 kg, 7.5 lbs

Specifications and external appearance are subject to
change without notice as a result of product improve-
ment.

F901 252158 A 1.6A-UL,T-237,Fuse
252069 A 0.8A~SE-EAK,Fuse

F902~F904 252075 A 2.5A-SE-EAK,Fuse
NOTE : 120V model only

230V model only