background image
XM-754HX
SERVICE MANUAL
STEREO POWER AMPLIFIER
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
Other Specifications
Circuit system
OTL (output transformerless) circuit
Pulse power supply
Inputs
RCA pin jacks
High level input connector
Outputs
Speaker terminals
Speaker impedance
1* ­ 8
(stereo)
2* ­ 8
(when used as a bridging amplifier)
Maximum outputs (HI-CURRENT/HI-VOLTAGE)
Four speakers :
90/170 W x 4 (at 4
)
Three speakers :
90 W x 2 + 250W x 1 / 170W x 2 + 400W x 1
(at 4
)
Two speakers :
250/400 W x 2 (at 4
)
Rated outputs (HI-CURRENT/HI-VOLTAGE)
(supply voltage at 14.4 V)
Four speakers :
35/75 W x 4 (20 Hz ­ 20 kHz, 0.04% THD,
at 4
)
50/100 W x 4 (20 Hz ­ 20 kHz, 0.1% THD,
at 2
)
Two speakers :
100/200 W x2 (20 Hz ­ 20 kHz, 0.1% THD,
at 4
)
Frequency response
+0.5
5 Hz ­ 50 kHz (
­3 dB)
AUDIO POWER SPECIFICATIONS (US model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
75 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.
Harmonic distortion
0.005% or less (at lkHz, 4
)
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
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 : 40 A
(4
HI-VOLTAGE mode)
Remote input : 1.5 mA
Dimensions
Approx. 258 x 50 x 320 mm (w/h/d)
(10 l/4 x 2 x 12 5/8 in.) not incl. projecting parts and
controls
Mass
Approx. 3.5 kg (7 lb. 11 oz.) not incl. accessories
Supplied accessories
Mounting screws (4),
Terminal cap (1)
Design and specifications are subject to change without notice.
* HI-CURRENT only
1
Ver 1.1 2001. 08
Sony Corporation
e Vehicle Company
Shinagawa Tec Service Manual Production Group
9-925-796-12
2001H0400-1
© 2001. 8


background image
­ 2 ­
Specifications ............................................................................. 1
1. SERVICING NOTE ....................................................... 2
2. GENERAL ....................................................................... 3
3. DISASSEMBLY
3-1. Bottom Plate, Panel (Front), Panel (Rear),
SP (Front) Board, SP (Rear) Board Removal .............. 5
3-2. Amplifier Board Removal ............................................ 5
4. ELECTRICAL ADJUSTMENT ................................. 6
5. DIAGRAMS
5-1. Block Diagram .............................................................. 7
5-2. Printed Wiring Boards ................................................ 10
5-3. Schematic Diagram ..................................................... 15
6. EXPLODED VIEW ...................................................... 17
7. ELECTRICAL PARTS LIST .................................... 18
TABLE OF CONTENTS
SECTION 1
SERVICING NOTE
CANCELLING THE PROTECTOR DURING SERVICING
Cut JW132 on the amplifier board to cancel the protector.
After servicing always be sure to return JW132 to its original state.
T901
JW131
JW132
JW168
JW167
PROTECTOR OFF


background image
­ 3 ­
SECTION 2
GENERAL
This section is extracted from
instruction manual.


background image
­ 4 ­


background image
­ 5 ­
­ 6 ­
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. BOTTOM PLATE, PANEL (FRONT), PANEL (REAR), SP (FRONT) BOARD,
SP (REAR) BOARD REMOVAL
3-2. AMPLIFIER BOARD REMOVAL
1 Screws (+BTP 3X5)
1 Screws (+BTP 3X5)
2 Bottom plate
7 Screw (+BTP 3X8)
7 Screws
(+BTP 3X8)
7 Screws
(+BTP 3X8)
!¡ Screws
9 Screws
8 Panel (rear)
!TM SP (rear) board
!º SP (front)
board
CN803
CN802
6 Panel (front)
5 Connector
Heat sink
4 Screws (+BTP 3X8)
3 Auto fuse (40A)
4 Screws
(+BTP 3X8)
4 Screw
(+BTP 3X8)
3 Screws
(+P 4X10)
2 High level board
1 Screws
(+BTP 3X5)
3 Screws
(+P 4X10)
3 Amplifier board
Heat sink
SECTION 4
ELECTRICAL ADJUSTMENT
Bias Adjustment
Procedure :
1. Rotare semi-fixed resistors RV104, RV204, RV304 and RV404
fully counterclockwise as viewed from the component side
2. No signal is entered, as input signal.
3. Apply the source voltage 14.4V between +12V, REMOTE and
GND terminals.
4. Adjust the RV104 (FRONT L-CH), RV204 (FRONT R-CH),
RV304 (REAR L-CH) and RV404 (REAR R-CH) so that the
digital voltmeter reading becomes the adjustment limits below.
Adjustment Limits : 3 ± 0.3mV
Adjustment Location :
[AMPLIFIER BOARD] (Component side)
digital
voltmeter
TP301
TP401
TP402
R343
R443
R143
R243
RV304
L-CH
R-CH
RV404
digital
voltmeter
TP202
TP201
TP101
RV104
L-CH
R-CH
RV204
­ REAR ­
­ FRONT ­