Sony XM-444 - Service Manual

1
SERVICE MANUAL
AEP Model
UK Model
E Model
XM-444
STEREO POWER AMPLIFIER
Circuit system OTL (output transformerless) circuit Pulse
power supply
Inputs RCA pin jacks
High level input connector
Input level adjustment range
0.3 – 6 V (RCA pin jacks),
0.6 – 12 V (High level input)
Outputs Speaker terminals
Speaker impedance 2 – 8 Ω (stereo)
4 – 8 Ω (when used as a bridging amplifier)
Maximum outputs
4 Speakers: 80 W × 4 (at 4 Ω)
3 Speakers: 80 W × 2 + 222 W × 1 (at 4 Ω)
2 Speakers: 222 W × 2 (at 4 Ω)
Rated outputs (supply voltage at 14.4 V)
4 Speakers: 35 W × 4 (20 Hz – 20 kHz, 0.04% THD, at 4 Ω)
40 W × 4 (20 Hz – 20 kHz, 0.1% THD, at 2 Ω)
2 Speakers: 80 W × 2 (20 Hz – 20 kHz, 0.1% THD, at 4 Ω)
Frequency response 5 Hz – 80 kHz ( dB)
Harmonic distortion 0.005% or less (at 1 kHz, 4 Ω, 10 W)
Low-pass filter 80 Hz, –18 dB/oct
High-pass filter 80 Hz, –12 dB/oct
Power requirements 12 V DC car battery
(negative ground)
Power supply voltage 10.5 – 16 V
Current drain at rated output : 20 A (4 Ω, 35 W × 4)
Remote input : 1.5 mA
Dimensions Approx. 260 × 55 × 180 mm (w/h/d) not incl.
projecting parts and controls
Mass Approx. 2.4 kg not incl. accessories
Supplied accessories Mounting screws (4)
High level input cord (1)
Protection cap (1)
Design and specifications are subject to change without
notice.
SPECIFICATIONS
+0
–3
Ver 1.0 2002. 02
9-873-560-01
2002B0400-1
© 2002. 02
Sony Corporation
e Vehicle Company
Published by Sony Engineering Corporation

Summary

SERVICE MANUAL

SPECIFICATIONS

Technical specifications of the XM-444 audio amplifier.

PROTECTOR OPERATION CHECK

Thermal Protect

Procedure to check thermal protection functionality.

Over Current Protect

Procedure to check over current protection functionality.

Offset Protect

Procedure to check offset protection functionality.

Chassis Short Protect

Procedure to check chassis short protection functionality.

SECTION 1 GENERAL

Connections

Instructions for connecting the audio amplifier to power and speakers.

Precautions

Input Connections

High Level Input Connection (with Speaker Connection 1, 2 or 4)

High Level Input Connection (with Speaker Connection 3)

Line Input Connection (with Speaker Connection 1, 2 or 4)

Line Input Connection (with Speaker Connection 3)

Speaker Connections

4-Speaker System (with Input Connection A or C)

3-Speaker System (with Input Connection A or C)

2-Speaker System (with Input Connection B or D)

2-Way System (with Input Connection A or C)

SECTION 2 DISASSEMBLY

3-2. BLOCK DIAGRAM - REAR;POWER SECTION -

3-3. SCHEMATIC DIAGRAM - AMP SECTION

3-4. SCHEMATIC DIAGRAM - POWER SECTION

3-5. PRINTED WIRING BOARD

SECTION 4 EXPLODED VIEW

Safety Critical Components

Identifies safety-critical components and replacement advice.

SECTION 5 ELECTRICAL PARTS LIST

TRANSISTORS

RESISTORS (Part 1)

RESISTORS (Part 2)

RESISTORS (Part 3)

Sony XM-444 Specifications

General

Brand	Sony
Model	XM-444
Category	Amplifier
Language	English