Sony XM-754HX Operating Instructions (English, Руководство по обслуживанию

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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
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
fully counterclockwise as viewed from the component side
2. No signal is entered, as input signal.
3. Apply the source voltage 14.4V b12V, 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 –