Sony xm 444 service manual

Page 1

XIII-444

SERVICE MANUAL

Ver 1.0 2002. 02

AEP Model
UK Model
E Model

Circuit system

Inputs

SPECIFICATIONS

OTL (output transformerless) circuit Pulse
power supply

RCA pin jacks

High level input connector

Input level adjustment range

Outputs
Speaker impedance

Maximum outputs
4 Speakers:
3 Speakers:
2 Speakers:

0.3 , o v (RCA pin jacks).

0.6 , 12 V (High level input)

Speaker terminals

2 , 8 (2 (stereo)

4 , 8 (2 (when used as a bridging amplifier)

8OWX4(at4Q)
80WX2+222W><1(at4t2)
222w><2(at4o)

Rated outputs (supply voltage at 14.4 V)

4 Speakers:

2 Speakers:
Frequency response
Harmonic distonjon
LOerass filter
Highrpass filter
Power requirements

Power supply voltage
Current drain

Dimensions

Mass
Supplied aocessories

35 w x 4 (20 Hz , 20 kHz. 0.04% THD, at4 a)
40w x4 (20 Hzezokl-lz. 0.1% 11$.th s2)
80W x 2 (20 Hzezokl-lz. 0.1% THD. at4 :2)
5Hz420k1-12(12 dB)

0.005% or less (at 1 kHz, 4 52,10 W)

80 Hz, 713 dB/oct

80 Hz, 712 dB/oct

12v DC car battery

(negative ground)

10.5 , 16 V

at mled output : 20 A (4 S1. 35 W x 4)

Remote input: 1.5 mA

Approx. 250 X 55 x 130 mm (w/h/d) not incl.
projecting pans and controls

Approx. 2.4 kg not incl. accessories

Mounting screws (4)

High level input cord (1)

Protection cap (1)

Design and specifications are subject In change wiznrnn

nolice.

9-873-560-01 Sony Corporation
2002BO400-1 e Vehicle Company
© 2002. 02 Published by Sony Engineering Corporation

STEREO POWER AMPLIFIER
S ONY;

Page 2

XM-444

PROTECTOR OPERATION CHECK

Thermal Protect

1. Short across TH801 with the power on.

2. Verify that the protector is operated and LD801 illuminates red.

3. Verify that the protector is released and LD801 illuminates green
when the short is removed.

4. Likewise, perform items 1 to 3 for TH802 and TH803.

Over Current Protect

1. Short between the positive and negative sides of the speaker
output terminal CN802 with the power on.
(Perform this shorting for each channel on FRONT and REAR.)

2. Verify that the protector is operated and LD801 illuminates red.

3. Verify that the protector is not released and LD801 remains red
even when the short is removed.

4. Verify that the protector is released and LD801 illuminates green
when the power is turned off and then on again.

Offset Protect

1. Short between the +12V terminal of CN801 and the BTL+ or
BTL~ of the speaker output terminal CN802.
(Short between +12V terminal and BTL+ and between +12V
terminal and BTL-.)

2. Verify that the protector is operated and LD801 illuminates red.

3. Verify that the protector is not released and LD801 remains red
even when the short is removed.

4. Verify that the protector is released and LD801 illuminates green
when the power is turned off and then on again.

Chassis Short Protect

1. Short between the +12V terminal of CN801 and the chassis with
the power on.

2. Verify that the pilot lamp PL801 goes on.

3. Verify that PLSOl goes off when the short is removed.

TABLE OF CONTENTS

1. GENERAL

Connections ............................................................................. 3

2. DISASSEMBLY

2-1. Bottom Plate ........................................................................ 5
2»2. Heat Sink... 6
23. Amp Board .

3. DIAG RAMS
31. Block Diagram eFront Section- .....
32. Block Diagram ~Rear/Power SectionA
3-3. Schematic Diagram ~Amp Section- ..
3-4. Schematic Diagram ~Power Section~
35. Printed Wiring Board .

I-I-i
._.oooo\1

4. EXPLODED VIEW.

5. ELECTRICAL PARTS LIST...

Notes on Chip Component Replacement

- Never reuse a disconnected chip component.

- Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

SAFETY-RELATED COMPONENT WARNINGl!

COMPONENTS IDENTIFIED BY MARK A OR DOI'I'ED LINE
WITH MARK A ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.