Sony xm-404eqx Service Manual

XM-404EQX/604EQX

SERVICE MANUAL

Photo : XM-604EQX

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS (US, Canadian model)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION
40 (404EQX), 60 (604EQX) watts per channel minimum continuous
average power into 4 ohms, four channels driven from 20 Hz to 20 kHz
with no more than 0.04% total harmonic distortion per Car Audio Ad Hoc
Committee standards.

Other Specifications

Circuit system OTL (output transformerless) circuit

Pulse power supply

Inputs RCA pin jacks

High level input connector

Outputs Speaker terminals
Speaker impedance 2 – 8 Ω (stereo)

4 – 8 Ω (when used as a bridging
amplifier)

Maximum outputs XM-404EQX:

Four speakers:
80 watts × 4 (at 4 Ω)
Three speakers:
80 watts × 2 + 200 watts × 1 (at 4 Ω)
Two speakers:
200 watts × 2 (at 4 Ω)
XM-604EQX:
Four speakers:
120 watts × 4 (at 4 Ω)
Three speakers:
120 watts × 2 + 300 watts × 1 (at 4 Ω)
Two speakers:
300 watts × 2 (at 4 Ω)

Rated outputs (supply voltage at 14.4 V)

XM-404EQX:
Four speakers:
40 watts × 4 (20 Hz – 20 kHz, 0.04%
THD, at 4 Ω)
50 watts × 4 (20 Hz – 20 kHz, 0.1%
THD, at 2 Ω)
Two speakers:
100 watts × 2 (20 Hz – 20 kHz, 0.1%
THD, at 4 Ω)
XM-604EQX:
Four speakers:
60 watts × 4 (20 Hz – 20 kHz, 0.04%
THD, at 4 Ω)
75 watts × 4 (20 Hz – 20 kHz, 0.1%
THD, at 2 Ω)
Two speakers:
150 watts × 2 (20 Hz – 20 kHz, 0.1%
THD, at 4 Ω)

US Model

Canadian Model

AEP Model

UK Model

E Model

Frequency response 5 Hz – 100 kHz ( dB)
Harmonic distortion 0.005% or less (at 1 kHz, 4 Ω)
Input level adjustment range

0.2 – 4.0 V (RCA pin jacks)

0.4 – 8.0 V (High level input)
High-pass filter 50 – 200 Hz, –12 dB/oct
Low-pass filter 50 – 200 Hz, –12 dB/oct
Equalizer 50 Hz, 200 Hz, 800 Hz, 3.2 kHz,

12.8 kHz

±12 dB

Power requirements 12 V DC car battery

(negative ground)
Power supply voltage 10.5 – 16 V
Current drain At rated output: 23 A

Remote input: 1.5 mA
Dimensions Approx. 260 × 55 × 320 mm

(w/h/d) (10

incl. projecting parts and controls
Mass XM-404EQX:

Approx. 3.2 kg (7 lb. 1 oz.) not incl.

accessories

XM-604EQX:

Approx. 3.3 kg (7 lb. 4 oz.) not incl.

accessories
Supplied accessories Mounting screws (4), Terminal cap (1)

Design and specifications are subject to change without
notice.

+0
–3

1/4 × 2 1/4 × 12 5/8 in.) not

STEREO POWER AMPLIFIER

MICROFILM

– 1 –

TABLE OF CONTENTS

1. GENERAL

Location and Function of Controls.......................................... 3

Connections ............................................................................. 4

2. DISASSEMBLY

2-1. Bottom Plate........................................................................ 6

2-2. Panel (A) ............................................................................. 6

2-3. Panel (B)..............................................................................7

2-4. AMP Board ......................................................................... 7

2-5. Control Panel Block ............................................................ 8

3. DIAGRAMS

3-1. Block Diagram .................................................................... 9

3-2. Printed Wiring Board –AMP Section–.............................. 13

3-3. Schematic Diagram –AMP Section– ................................ 15

3-4. Schematic Diagram –EQ Section–.................................... 17

3-5. Printed Wiring Board –EQ Section–................................. 17

3-6. Schematic Diagram –IND Section– .................................. 19

3-7. Printed Wiring Board –IND Section– ............................... 20

3-8. Schematic Diagram –LED Section– ................................. 21

3-9. Printed Wiring Board –LED Section–............................... 21

4. EXPLODED VIEWS

4-1. Heat Sink Section .............................................................. 22

4-2. Control Panel Section........................................................ 23

5. ELECTRICAL PARTS LIST ........................................ 24

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.

– 2 –

SECTION 1

GENERAL

This section is extracted from
XM-604EQX’s instruction manual.

– 3 –

– 4 –

– 5 –

4

SECTION 2

)

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. BOTTOM PLATE

2

BTP 3x4

1

BTP 3x5

4

bottom plate

3

BTP 3x

2-2. PANEL (A)

1

BTP 3x8

3

panel (A

2

BTP 3x8

– 6 –

1 BTP 3x12

2

BTP 3x12

4

BVTP 3x12

5

screw (3x8) (CNZ-N)

3

fuse
(30A): XM-404EQX
(40A): XM-604EQX

6

AMP board

2-3. P ANEL (B)

)

2-4. AMP BOARD

4

CNP804

2

BTP 3x8

1

BTP 3x8

3

panel (B

– 7 –

2-5. CONTROL PANEL BLOCK

2

claw

5

CNJ807

7

control panel block

1

claw

3

CNP806

6

CNJ808

4

CNP807

– 8 –

XM-404EQX/604EQX

3-1. BLOCK DIAGRAM

INPUT

REAR

(MONO)

HIGH
LEVEL
INPUT

SECTION 3

DIAGRAMS

CNJ801

L

R

L

R

–3

–4

CN803

(REAR)

R-CH

CN805

SPEAKER OUT

REAR

L

L+R

R

MONO

04

INPUT

FRONT

L

(MONO)

L

HIGH
LEVEL
INPUT

R

R

+12V

REMOTE

Signal path
: AUDIO

CNJ801-1

CN802

CNJ801-2

CN801

F901

+

+

+

+

+

Q901

POWER
ON/OFF

2
3

Q902 , 903

B+

SWITCH

Q805

LED

DRIVE

SWITCH

LINE AMP

IC101

–

+

R-CH

R-CH

LD825

CURRENT

B+

OVER

1

SWITCH

–

5

+

6

EQ

IC102

Q806

LED

DRIVE

LD826
OFFSET

POWER/PROTECTOR

LPF

IC103 (1/2)

VR101-1

7

VR101
FILTER

(FRONT)

Q807

LED

DRIVE

SWITCH

B+

76

B+

B+

LD827

THERMAL

VR101-2

OFF
HPF

Q810

LPF

IC103 (2/2)

LPF

S101

EQ AMP

FILTER

(FRONT)

IC104-108

DC DET

IC902

42

31

D801

TH802

TH801

16 10 9

3

12

1

VR102 50Hz
VR103 200Hz
VR104 800Hz
VR105 3.2kHz
VR106 12.8kHz

EQUALIZER

(FRONT)

Q809, 812

PROTECT

LATCH

(CURRENT CHECK)

Q808, 811

PROTECT

LATCH

(CURRENT CHECK)

Q905, 906

ON/OFF

CONTROL

(FRONT)

EQ BUFFER

IC109
+

3

–

2

DRIVER

DC-DC CONVERTER

CONTROL

IC901

OSC

1

B– (AMP) B+(AMP)

Q907

ON/OFF

DRIVE

Q909

ON/OFF

DRIVE

Q910

ON/OFF

DRIVE

Q908

ON/OFF

DRIVE

12

VCC

B+

S102

DIRECT

(FRONT)

OFF

ON

604EQX

604EQX

BUFFER

IC110

Q813, 814

LINE

CONTROL

DC-DC CONVERTER

TRANSFORMER

T901

IC802

LD801 – 824

LEVEL

METER

R-CH

CN804

SPEAKER OUT

FRONT

L

R

MONOL+R

Q801 – 804

LED

DRIVE

SIGNAL METER AMP

LINE

SWITCH

Q112

13

VR107
LEVEL

(FRONT)

Q904

D912

+6V
REG

D903
D904

D901
D902

IC801

Q101 – 106

DRIVER

Q111

OVER LOAD

DET

+6V

Q911, 913

Q912, 914

76 1

+15V

REG

–15V

REG

AC1 IN

Q107 – 110

POWER

AMP

12 – 15 16 – 21

D4–D1 O6–O1

LED CONTROL

(FRONT)

Q815-816

VOLTAGE

CHECK

B+(AMP)

+15V

–15V

B–(AMP)

B+(PRE)

B–(PRE)

– 9 – – 10 –