XM-4S - Sony Car Audio Service Manual (repair manual)

1

US Model

Canadian Model

AEP Model

UK Model

E Model

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

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),
1.2 – 12 V (High level input)

Outputs

Speaker terminals

Speaker impedance

2 – 8 

Ω (stereo)

4 – 8 

Ω (when used as a bridging amplifier)

Maximum output

4 speakers: 95 W 

× 4 (at 4 Ω)

3 speakers: 95 W 

× 2 + 250 W × 1 (at 4 Ω)

Rated output (supply voltage at 14.4 V)

4 speakers:
50 W 

× 4 (20 Hz – 20 kHz, 0.04% THD, at 4 Ω)

60 W 

× 4 (20 Hz – 20 kHz, 0.1% THD, at 2 Ω)

Frequency response

5 Hz – 100 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

Low Boost

0 – 10 dB (40 Hz)

Power requirements

12 V DC car battery (negative ground)

Power supply voltage

10.5 – 16 V

Current drain

at rated output : 27 A (4 

Ω, 50 W × 4)

Remote input : 1 mA

Dimensions

Approx. 223 

× 43.5 × 196 mm

(8 

7/8

 

× 1

3/4

 

× 7 

3/4

 in.) (w/h/d)

not incl. projecting parts and controls

Mass

Approx. 2.2 kg (4 lb 14 oz) not incl. accessories

Supplied accessories

Mounting screws (4)
High level input cord (1)

+0

–3

2007H04-1

© 2007. 08

2

1. Short across TH901 with the power on.
2. Verify that the protector is operated and LED802 not illumi-

nates red. When input the signal and verify that there is no out-
put on the SP-OUT even when the volume is increased.

3. Verify that the protector is released and there is an output on the

SP-OUT when the short is removed.

4. Likewise, perform items 1 to 3 for TH904 and TH905.

1. Short between the positive and negative sides of the speaker

output terminals CN903 and CN904 (2/2) with the power on.
(Perform this shorting for each channel on FRONT and REAR.)

2. Verify that the protector is operated and LED802 illuminates

red. LED803 and LED804 are turned off.

3. Verify that the protector is not released and LED802 remains

red even when the short is removed.

4. Verify that the protector is released and LED802 is turned off

and LED803 and LED804 illuminates white when the power is
turned off and then on again.

1. Short between the +12V terminal of CN904 (1/2) and the (L+R)

+ or (L+R) – of the speaker output terminal CN904 (2/2).
(Short between +12V terminal and (L+R) + and between +12V
terminal and (L+R) –.)

2. Verify that the protector is operated and LED802 illuminates

red. LED803 and LED804 are turned off.

3. Verify that the protector is not released and LED802 remains

red even when the short is removed.

4. Verify that the protector is released and LED802 is turned off

and LED803 and LED804 illuminates white when the power is
turned off and then on again.

Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

0

0

0

Please confirm the car audio unit works even if REM output is not
connected when you connect this set with the car audio unit by the
HIGH LEVEL INPUT.

The transistors Q110, 111, 210, 211, 310, 311, 410 and 411 have
two different ranks: P rank and Y rank.
The rank of these transistors need to be selected properly according
to each channel. When replacing any one of these transistors, check
its rank and replace with the appropriate transistor of the same rank.

Rank

Q110, 210, 310, 410

Q111, 211, 311, 411

P

2SC5100-P

2SA1908-P

(8-729-024-79)

(8-872-024-76)

Y

2SC5100-Y

2SA1908-Y

(8-729-024-80)

(8-872-024-77)

A1908: 2SA1908
C5100: 2SC5100

P: RANK P
Y: RANK Y

3

Location and Function of Controls .......................................... 4
Connections ............................................................................. 5

2-1.   MAIN Board Section .......................................................... 8
2-2.   FILTER Board ..................................................................... 9
2-3.   MAIN Board ....................................................................... 9

3-1.   Block Diagram .................................................................. 11
3-2.   Circuit Boards Location .................................................... 12
3-3.   Printed Wiring Boards –Main Section (1/2)– .................... 13
3-4.   Printed Wiring Boards –Main Section (2/2)– .................... 14
3-5.   Schematic Diagram –Main Section (1/2)– ........................ 15
3-6.   Schematic Diagram –Main Section (2/2)– ........................ 16
3-7.   Printed Wiring Boards –Filter Section– ............................ 17
3-8.   Schematic Diagram –Filter Section– ................................ 18

4-1.   Heat Sink (Main) Section .................................................. 20
4-2.   MAIN Board Section ........................................................ 21

........................................ 22

4

This section is extracted
from instruction manual.

• Maximum power output of 95 W per channel (at 4

Ω).

• This unit can be used as a bridging amplifier with

a maximum output of 250 W (only Rear ch).

• Built-in LPF (low-pass filter), HPF (high-pass filter)

and Low Boost circuit.

• Built in protection circuit.
• Pulse power supply * for stable and regulated

output power.

• Direct connection can be made with the speaker

output of your car audio if it is not equipped with
the line output (High level input connection).

• Puissance de sortie maximale de 95 W par canal (à

4 

Ω).

• Cet appareil peut être utilisé comme amplificateur

en pont avec une sortie maximale de 250 W (canal
arrière uniquement).

• Filtre passe-bas (LPF), filtre passe-haut (HPF) et

circuit d’amplification de basses fréquences
intégrés.

• Circuit de protection intégré.
• Alimentation électrique par impulsions* pour une

puissance de sortie stable et régulée.

• Il est possible d’établir une connexion directe avec

la sortie de haut-parleur de votre autoradio si
celui-ci n’est pas équipé d’une sortie de ligne
(connexion d’entrée haut niveau).

• Salida de potencia máxima de 95 W por canal (a 4

Ω).

• Esta unidad puede utilizarse como amplificador de

puente con una salida máxima de 250 W (sólo
canales posteriores).

• Construida con filtro de paso bajo (LPF) , filtro de

paso alto (HPF) y circuito de incremento de bajas
frecuencias.

• Circuito de protección incorporado.
• Suministro de alimentación por impulsos* para

obtener una potencia de salida estable y regulada.

• Es posible realizar una conexión directa con la

salida de altavoz de un sistema de audio para

*

 

This unit has a built-in power regulator which
converts the power supplied by the 12 V DC car
battery into high speed pulses using a
semiconductor switch. These pulses are stepped up
by the built-in pulse transformer and separated into
both positive and negative power supplies before
being converted into direct current again. This is to
regulate fluctuating voltage from the car battery.
This light weight power supply system provides a
highly efficient power supply with a low impedance
output.

*

Cet appareil est équipé d’un régulateur de
puissance intégré qui convertit la puissance fournie
par la batterie de voiture de 12 V CC en impulsions
ultra-rapides au moyen d’un commutateur à semi-
conducteur. Ces impulsions sont amplifiées par le
transformateur d’impulsions intégré et séparées en
alimentation positive et négative avant d’être
reconverties en courant continu. Ce processus
permet de compenser les fluctuations de tension
provenant de la batterie de la voiture. Ce système
d’alimentation léger assure une alimentation
électrique très efficace pour une sortie d’impédance
faible.

automóvil si éste no está equipado con salida de
línea (Conexión de entrada de alto nivel).

*

Esta unidad dispone de un regulador de potencia
incorporado que convierte el suministro de
alimentación de cc de 12 V de la batería del
automóvil en impulsos de alta velocidad mediante
un interruptor semiconductor. Estos impulsos se
incrementan mediante el transformador de
impulsos incorporado y se dividen en suministro de
alimentación positiva y negativa antes de volver a
convertirse en corriente directa. De esta forma, se
regula la tensión fluctuante de la batería del
automóvil. Este sistema de suministro de
alimentación de peso ligero proporciona una alta
eficacia del suministro con una salida de baja
impedancia.

Unit: mm (in)
Unité : mm (po)
Unidad: mm

1

The input level can be adjusted with this
control. Turn it in the clockwise direction
when the output level of the car audio unit
seems low.

2

When the HPF switch is set to ON, the High-
pass filter (80 Hz) is effective.

3

When the LPF switch is set to ON, the Low-
pass filter (80 Hz) is effective.

4

7

Use this switch to turn on or off the BLUE
ILLUMINATION lamp.

5

Turn this control to boost the frequencies
around 40 Hz to a maximum of 10 dB.

6

Lights up white during normal operation. If
the PROTECTOR is activated, Illumination
will change from white to red.
When the PROTECTOR is activated refer to
the Troubleshooting Guide.

7

When the BLUE ILLUMINATION lamp is set
to ON, the BLUE ILLUMINATION lamp
lights up the foot area of the car.

8

Heats inside the unit is dissipated from here.

1

Le niveau d’entrée peut se régler avec cette
commande. Tournez cette commande dans le
sens des aiguilles d’une montre lorsque le
niveau de sortie de l’autoradio semble faible.

2

Lorsque le commutateur HPF est réglé sur
ON, le filtre passe-haut (80 Hz) est activé.

3

Lorsque le commutateur LPF est réglé sur
ON, le filtre passe-bas (80 Hz) est activé.

4

7

Utilisez ce commutateur pour allumer ou
éteindre le témoin BLUE ILLUMINATION.

5

Tournez cette commande pour amplifier les
fréquences autour de 40 Hz à un maximum
de 10 dB.

6

S’allume en blanc en mode de
fonctionnement normal. Si le témoin
PROTECTOR est activé, l’éclairage devient
rouge.
Lorsque PROTECTOR est activé, reportez-
vous au guide de dépannage.

7

Lorsque le témoin BLUE ILLUMINATION
est réglé sur ON, il éclaire le sol de la voiture.

8

Cette sortie permet à la chaleur à l’intérieur
de l’appareil de se dissiper.

1

Es posible ajustar el nivel de entrada con este
control al utilizar equipos fuente de otros
fabricantes. Gírelo en el sentido de las agujas
del reloj si el nivel de salida del sistema de
audio para automóvil parece bajo.

2

Cuando el interruptor HPF está ajustado en
ON, se activa el filtro de paso alto (80 Hz).

3

Cuando el interruptor LPF está ajustado en
ON, se activa el f

iltro de paso bajo

 (80 Hz).

4

7

Utilice este interruptor para encender o
apagar el indicador BLUE ILLUMINATION
(indicador de iluminación azul).

5

Gire este control para incrementar las
frecuencias alrededor de 40 Hz a un valor
máximo de 10 dB.

6

Se enciende en blanco durante el
funcionamiento normal. Si el PROTECTOR
está activado, la iluminación cambiará de
blanco a rojo.
Si se activa PROTECTOR, consulte la guía de
solución de problemas.

7

Cuando el indicador BLUE ILLUMINATION
está ajustado en ON (encendido), éste
ilumina el piso del automóvil.

8

El calor de la unidad se disipará por la salida
de ventilación.