Sony XM-754HX Service Manual ▷ View online
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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
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)
!™
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
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
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.
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 –
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5-3. SCHEMATIC DIAGRAM
XM-754HX
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