Disassembly; Bottom Plate, Panel (Front), Panel (Rear) Removal; Amp/Power Board Removal; Diagrams - Sony XM-2252HX Service Manual

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

4-1. BOTTOM PLATE, PANEL (FRONT), PANEL (REAR) REMOVAL

3
Two screws
(BTP 3x5)
1
Three screws
(BTP 3x5)
5
Bottom plate
!£
Screw
(BTP 3x8)
!¢
Three screws
(BTP 3x8)
!¶
Panel (Rear)
!∞
Two screws
!§
Screw
(BTP 3x8)
(BTP 3x8)

4-2. AMP/POWER BOARD REMOVAL

Note :
Amplifier board and Power board are not
separated because the board is long and heavy.
Take care not to damage the board when removing.
1
Four screws
(P 4x10)
Amplifier board
5
Amp/power board
SECTION 4
2
Three screws
(BTP 3x5)
!¡
Three screws
7
Auto fuse
(BTP 3x8)
(F902)
9
Screw
(BTP 3x8)
4
Two screws
(BTP 3x5)
0
Three screws
(BTP 3x8)
!™
Panel (Front)
6
Connector
(CNP802)
Heat sink block
Power board
2
Four screws
(P 4x10)
6
Light interseption rubber
– 9 –
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1 /
4
specified.
8
Auto fuse
• : internal component.
¢
(F901)
• C : panel designation.
• U : B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : POWER ON
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : AUDIO
For printed wiring boards.
Note:
• X : parts extracted from the component side.
•
¢ : internal component.

5-1. IC BLOCK DIAGRAMS

IC101- 103, 201- 203 NJM4580E
A OUT 1 8 V+
A –IN 2 7 B OUT
A B
4
Four screws
(P 4x10)
A +IN 3 6 B –IN
V– 4 5 B +IN
3
Four screws
(P 4x10)
7
Heat sink
SECTION 5

DIAGRAMS

• WAVEFORMS
1
27 µ sec
2
W or less unless otherwise
27 µ sec
3
27 µ sec
4
27 µ sec
IC901 µPC494GS
16 15 14 13 12 11
REG.
REF.
ERROR
ERROR
0.1V OSC
1 2 3 4 5 6
– 10 –
XM-2252HX
14Vp-p
29Vp-p
29Vp-p
60Vp-p
10 9
7 8