Disassembly; Bottom Plate, Panel (Front), Panel (Rear); Amplifier Board Removal; Electrical Adjustment - Sony XM-754HX Service Manual

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
1 Screws (+BTP 3X5)
2 Bottom plate
4 Screw
(+BTP 3X8)
4 Screws
5 Connector
(+BTP 3X8)
6 Panel (front)
3 Auto fuse (40A)
4 Screws (+BTP 3X8)

3-2. AMPLIFIER BOARD REMOVAL

2 High level board
3 Screws
(+P 4X10)
3 Amplifier board
SECTION 3
1 Screws (+BTP 3X5)
7 Screws
(+BTP 3X8)
7 Screw (+BTP 3X8)
CN802
!º SP (front)
board
9 Screws
8 Panel (rear)
CN803
!™ SP (rear) board
!¡ Screws
Heat sink
1 Screws
(+BTP 3X5)
3 Screws
(+P 4X10)
Heat sink
– 5 –
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)
7 Screws
(+BTP 3X8)
– FRONT –
– REAR –
digital
voltmeter
L-CH
SECTION 4

ELECTRICAL ADJUSTMENT

R143 R243
TP101
TP201
RV104
RV204
R-CH
L-CH
R-CH
RV404
RV304
TP301
TP401
R343 R443
TP402
– 6 –
TP202
digital
voltmeter