Sony xm 2540 service manual

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XM-2540/254US

SERVICE MANUAL us Model

Canadian Model

XM-2540

AEP Model
UK Model
E Model

XM-254OS

Photo : XM-25408

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION 25 watts per channel
minimum continuous average power into 4 ohms, both channels driven from 20 -
20,000 Hz with no more than 004 "/0 total harmonic distortion per Car Audio Ad
Hoc Committee standards.

LOther Specifications

Circuit system OTL (output translormetless) Input level adjustment range
circuit pulse power supply 0.2 e 2 V
lnpuls RCA pln jacks 2 _ 16 v (High level input
Also compatible with the connection)
speaker outputs 01 a car audio Power requirements
with the use 01 supplied high 12 V DC car battery
level input cords. (negative ground)
Outputs Speaker output leads Power supply voltage
Speaker impedance 2 10.5 - 16 V .
' 2 - 8 ohms (stereo) Current drain at rated output: 14 A
4 - 8 ohms (when used as a (4 ohms, 25 w x A)
bridging amplifier) at 10% THD: 20 A
Maximum output at 4 ohms remote input: 5 mA
50 W per channel with Dimensions Approx. 201 x 46 x 169 mm
4-speaker system (w/h/d)
40 W x 2 plus 140 W x 1 with (8 x113/t6 x 63/4 in.) not incl.
3-speaker syslem projecting pans and controls
120 W per channel with Mass Approx. 1.7 kg (3 lb. 12 01.) not
2-speaker system incl, accessories
Rated outputs (supply voltage at 14.4 V) Supplied accessories
25 W per channel with Mounting screws (4)
4-speaker system (20 Hz 4 20 Speaker output leads (1 set)
kHz. 0.04% THD, at 4 ohms) High level input cords (4)
30 w per channel with
4-spaaker system (20 Hz - 20 Design and specifications subject to change
kHz, 0.3% THD, at 2 ohms) without notice.

20 W per Channel (20 Hz - 20
kHz. 0.04 °/e THD, at 4 ohms)
plus 70 w (20 Hz - 20 kHz.
0.3% THD, at 4 ohms) with
3-speaker system

60 W per channel with
2-speaker system (20 Hz - 20

kHz, 0.3% THD, at 4 ohms)
STEREO PIIWER AMPLIFIER
5 Hz - 100 kHz (:8 dB)
Harmonic distortion
0.005% or less
(at 1 kHz, 4 ohms, 10 W)
®

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- Maximum power output of: 50 watts per
channel with a 4-speaker system. 40 watts x 2
plus 140 watts x 1 with a 3-speaker system or
120 watts per channel with a 2-speaker
system (at 4 ohms).

. Wide dynamic range and low distortion (less
than 0.005%).

' Provided with a protection circuit.

o Pulse power supply tor stable and regulated
output power.

° Direct connection can be made with the
speaker output 01 your car audio it it is not
equipped with the line outputs (High level input
connection).

rtPulse power supply
This unit has a built-in convertor which
converts the power supply trom the DC 12 volt
car battery into high speed signals by the use
0! the semiconductor switch. These signals
will be stepped up by the builHn pulse
translormer and separated into both positive
and negative power supplies before! being
converted into the direct current again. This IS
to regulate the otherwise variable voltage oi
the car battery.
The light weight power supply system provides
the highly efficient power supply with a low
impedance output.

TABLE OF CONTENTS

Section Title Page

1. GENERAL

2. DIAGRAMS

2-1. Block Diagram.,.,
2-2. Printed Wiring Boards......
2-3. Schematic Diagram......
24. Semiconductor Lead Layouts

LONE."

3. EXPLODED VIEW.

4. ELECTRICAL PARTS LIST ..... M13

Fuse Replacement

It the luse blows, check the power connection
and replace the luse. It the luse blows again
alter the replacement, there may be an internal
mallunction. In such a case. consult your
nearest Sony dealer.

Warning

Use the specified luse with correct amperage
rating.

Use ol 3 luse with higher amperage rating may
cause serious damage to the unit.

*Protection circuit
This amplifier is provided with a protection
circuit which operates in the following cases
jwhen:
- the unit is overheated
* a DC current is generated
-7 the speaker terminals are short circuited.
The color of the POWER/PROTECTOR
indicator will change trorn green to red and the
unit will shut down. II this happens, turn all the
connected equipment and take out the
cassette tape or disc and determine the cause
0! the mallunction. If the amplifier has
overheated, wait until the unit cools oll.

POWER/PROTECTOR Indicator

SERVICE NOTE

Notes in regard to replcing the power ampli-
tude transistors
(0112, 113, 212, 213, 312, 313, 412, 413)

When replacing the transistors used for power ampli-
tude section(ZSB1587, ZSD2538). replace both transis-
tors with same hfe ranks for each channel.

/type number

BUDDH-
D l:I\t11e ranks