Onkyo M 5550 Service Manual

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SERIAL No. 3291

ONKYO® SERVICE MANUAL

STEREO POWER AMPLIFIER
MODEL M-5550

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARKAON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST
ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC
SHOCK. REPLACE THESE COMPONENTS WITH
ONKYO PARTSWHOSE PARTS NUMBERS APPEAR
AS SHOWN IN THIS MANUAL.

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

TABLE OF CONTENTS

Specifications ..........
Precautions
Block diagram ......

Chassis-exploded view
Adjustment procedures .
Printed board parts lis
Packing procedures.
IC Block diagram
Printed board view ..
Schematic diagram .................................................. l7

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SPECIFICATIONS

Continuous Power:

Output:

Dynamic Power Output:
Total Harmonic Distortion:
lntermodulation Distortion:
Frequency Response:

Input Sensitivity:

Input Impedance:

Damping Factor:

S/N ratio:

Outputs:
Inputs:

PRECAUTIONS

1. Replacing the fuses

2X220 watts at 4 ohms,
1kHz (DIN)

2X 145 watts at 8 ohms,
lkHz (DIN)

140 watts per channel, min.
RMS, at 8 ohms, both
channels driven, from ZOHZ
to 20kHz, with no more
than 0.005% Total
Harmonic Distortion
2x425 watts at 2 ohms, lkHz
2x290 watts at 4 ohms, lkHz
0.005% at rated power
0.005% at 1 watt output
0.004% at rated power
0.004% at 1 watt output
+0, ~1.5dB at 1H2 to
100kl-Iz

1.0V

20 kohms

140 (8 ohms, lkHz)

IZOdB ([HF-A Shorted)
SPEAKERS 1 & 2

INPUT

For continued protection against risk fire, replace only with
same type and same rating fuse.

CIRCUIT NO. PART NO.

F801.F802 252075

2. Replacing the lamp

DESCRIPTION

2.5A-SE~EAK, Primary {use

This unit uses the lamp listed below,

CIRCUIT N0.
PL701, PL702

PART NO.
210160

DESCRIPTION
PLI4V150mA

Power Supply:
Dimensions (WXHXD):

AC 220V, 50Hz

435 X 186x423 mm
17-1/8"><7-5/16"><16-5/8"
Wide side panels (WX HXD): 465 X 187 x423 mm
18-5/16><7~3/ ><16-5/

Weight: 185 kg (408 lbs.)

Specifications and features are subiect to change
without notice.