Sony XM-1502SX, XM-1902GX Service manual

XM-1502SX/1902GX

SERVICE MANUAL

Ver 1.1 2001.06

Photo: XM-1902GX

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION
150 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.

US Model

XM-1502SX/1902GX

Canadian Model

AEP Model

UK Model

E Model

XM-1502SX

Other Specifications

Circuit system OTL (output transformerless) circuit

Inputs RCA pin jacks

Outputs Speaker terminals

Speaker impedance 2 – 8 Ω (stereo) (XM-1502SX)

Maximum outputs 300 W × 2 (at 4 Ω)

Rated outputs (supply voltage at 14.4 V)

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

Pulse power supply

High level input connector

Through out pin jacks

1.3 – 8 Ω (stereo) (XM-1902GX)
4 – 8 Ω (when used as a bridging amplifier)

760 W (monaural) at 4 Ω

150 W × 2 (20 Hz – 20 kHz, 0.04% THD,
at 4 Ω)
190 W × 2 (20 Hz – 20 kHz, 0.1% THD,
at 2 Ω)
190 W × 2 (20 Hz – 20 kHz, 0.1% THD,
at 1.3 Ω) (XM-1902GX)
380 W × 1 (20 Hz – 20 kHz, 0.1% THD,
at 4 Ω) (XM-1902GX)
380 W (monaural) (20 Hz – 20 kHz, 0.1% THD,
at 4 Ω) (XM-1502SX)

0.2 – 6.0 V (RCA pin jacks)

0.4 – 12.0 V (High level input)

+0.5

–3

High-pass filter 50 – 300 Hz, –12 dB/oct
Low-pass filter 50 – 300 Hz, –12 dB/oct
Low boost 0 – 10 dB (40 Hz)
Phase shift adjustment range (XM-1902GX)

Power supply voltage 10.5 – 16 V
Current drain at rated output : 40 A (at 4 Ω)

Dimensions Approx. 358 × 50 × 264 mm

Mass Approx. 3.5 kg (7 lb. 11 oz.) not incl. accessories
Supplied accessories Mounting screws (4)

Design and specifications are subject to change without
notice.

0° – 180° (at 40 Hz)

Remote input : 2 mA

1/8 × 2 1/4 × 10 1/2 in.)

(14
(w/h/d) not incl. projecting parts and controls

9-870-239-12

2001F0400-1

© 2001.6

STEREO POWER AMPLIFIER

Sony Corporation

e Vehicle Company

Shinagawa Tec Service Manual Production Group

1

TABLE OF CONTENTS

1. GENERAL

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

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

2. DISASSEMBLY

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

2-2. Main Board ......................................................................... 6

2-3. Front Panel .......................................................................... 7

2-4. Led Board ............................................................................ 7

3. ELECTRICAL ADJUSTMENT...................................... 8

4. DIAGRAMS

4-1. Block Diagram .................................................................... 9

4-2. Printed Wiring Boards –Main Section– ............................ 11

4-3. Schematic Diagram –Main Section (1/2)– ........................ 12

4-4. Schematic Diagram –Main Section (2/2)– ........................ 13

5. EXPLODED VIEWS

5-1. Heat Sink Section .............................................................. 14

5-2. Main Board Section .......................................................... 14

6. ELECTRICAL PARTS LIST......................................... 15

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 instruction manual.

3

456

SECTION 2

DISASSEMBLY

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

2-1. PLATE, BOTTOM

4 P 2.6x2.8

3 BTP 3x6

6

2 BTP 3x6

1 BTP 3x6

5 plate, bottom

7 sheet, insulating

2-2. MAIN BOARD

2 BTP 3x6

1 BTP 3x6

3 B.TT. 3x14

4 B.TT. 3x14

5 B.TT. 3x14

7 MAIN board section

8 CN808

6

2-3. FRONT PANEL

)

4 MAIN board

2 P 3x8

2-4. LED BOARD

1 P 3x8

3 panel (2ch), front

1 BTP 3x6

2 LED board

heat sink (main

7

l

Ver 1.1 2001.06

SECTION 3

ELECTRICAL ADJUSTMENT

Bias Adjustment

Note : In Bias Adjustment, adjust RV105 if any of Q108 through

Q113 are replaced. Adjust RV205 if any of Q208 through
Q213 are replaced.

Condition : This adjustment should be performed about one minute

after the remote mode is turned on at a room tempera­ture of about 25°C.

Setting :

B+,REM terminal

set

Stabilized

Power suppy

Procedure :

1. Turn the variable resistors RV105 (L-CH) and RV205 (R-CH)
full clockwise as seen from the component side to minimize the
bias current.

2. The input signal is to be no signal.

3. Apply the voltage to the B+ and REM terminals from the stabi­lized power supply and gradually increase it up to 14.4 V while
checking for any unusual current.

4. For the XM-1502SX, adjust each of RV105 (L-CH) and RV205
(R-CH) so that the power current of the stabilized power supply
is increased in steps of 500 mA (total of 1 A). For the XM­1902GX, adjust each of RV105 (L-CH) and RV205 (R-CH) so
that the power current is increased in steps of 600 mA (total of

1.2 A).

5. After adjustment, check that the power current is at 1.3 to 2.0 A.

GND termina

Adjustment Location : Main board (component side)

– MAIN BOARD (COMPONENT SIDE) –

RV105

BIAS ADJUSTMENT

RV205

BIAS ADJUSTMENT

8