Sony xm 255ex
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Page 1
XM-255EX/255NX
SERVICE MANUAL Canadian Model
AEP Model
E Model
XM-255EX
UK Model
XM-255NX
Photo : XM-255EX
I.-
MICROFILM
SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
55 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.
Other Specifications
Circuit system OTL (output lransformerless) Circuit Power requirements 12 V DC car battery
Pulse power supply (negative ground)
Inputs RCA pin jacks Power supply Voltage
High level input connector 10.5 A 16 V
Outputs Speaker terminals Current drain At rated output: 15 A
Through out pin tacks Remote input: 14 mA
Speaker impedance 2 - 8 (l. (stereo) Dimensions Approx. 237 x 52 x 170 mm
4 7 5 (2 (when used as a bridging (9 5I» x 2 W x a 3/i in.) (w/h/d)
amplifier) not incl. projecting parts and controls
Maximum outputs 120 W x 2 (at 4 {2) Mass Approx. 1.5 kg (3 lb. 5 02.) not incl,
150 W x 2 (at 2 K2) accessories
300 W (monaui-all at 4 fl) Supplied accessories
Rated outputs Mounting screws (4),
(supply voltage at 14.4 v) Terminal cap (1)
55 W X 2 (20 Hz ~ 20 kHz,
0.04 "A: THD, at 4 0) Design and specifications are subject to change without
70 W x 2 (20 Hz - 20 kHz, notice.
0.1% THD, at 2 Q)
140 W (monaural) (20 Hz -
20 kHz, 0.1 "/o l'l-lD, at 4 (1)
Frequency response
5 Hz 7100 kHz ( 4 dB)
Harmonic distortion
0,005 /0 or less
(at 1kHz, 4 0)
input level adjustment range
0.2 7 4.0 v (RCA pin jacks)
0.4 - 8.0 V (High level input)
Lowrpass filter 50 , 200 Hz, ~18 dB/oct
STEREO POWER AMPLIFIER
S O NY®
Page 2
TABLE OF CONTENTS
Specifications ............................................................................. l
1. GENERAL ....................................................................... 3
2. DISASSEMBLY
21. Main Board Removal .
3. DIAGRAMS
3-1. Block Diagram ........ ..
3-2. Printed Wiring Boards .. 8
3-3. Schematic Diagrams ..................................................... 9
4. EXPLODED VIEW ...................................................... 10
5. ELECTRICAL PARTS LIST .................................... 10