XM-2252HX
– 9 –
SECTION 5
DIAGRAMS
5-1. IC BLOCK DIAGRAMS
IC101- 103, 201- 203 NJM4580E IC901 µPC494GS
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 Ωand 1/4W or less unless otherwise
specified.
•¢: internal component.
•C: panel designation.
•U: B+ Line.
• Powervoltage is dc 14.4V and fedwithregulateddcpower
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
• VoltagesaretakenwithaVOM (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.
1
2
3
45
6
7
8
A OUT
A –IN
A +IN
V–
V+
B OUT
B –IN
B +IN
AB
4
12 3 5 6 7 8
91016 15 14 13 12 11
ERROR
0.1V
REG.
REF.
OSC
ERROR
SECTION 4
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
4-1. BOTTOM PLATE, PANEL (FRONT), PANEL (REAR) REMOVAL
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.
Heat sink block
7
Auto fuse
(F902)
6
Connector
(CNP802)
8
Auto fuse
(F901)
9
Screw
(BTP 3x8)
!£
Screw
(BTP 3x8)
0
Three screws
(BTP 3x8)
!¡
Three screws
(BTP 3x8)
!¢
Three screws
(BTP 3x8)
!∞
Two screws
(BTP 3x8)
!§
Screw
BTP 3x8
!™
Panel (Front)
!¶
Panel (Rear)
Three screws
(BTP 3x5)
3
Two screws
(BTP 3x5)
4
Two screws
(BTP 3x5)
1
Three screws
(BTP 3x5)
5
Bottom plate
7
Heat sink
6
Light interseption rubber
3
Four screws
(P 4x10)
4
Four screws
(P 4x10)
2
Four screws
(P 4x10)
1
Four screws
(P 4x10)
5
Amp/power board
Amplifier board
Power board
– 10 –
•WAVEFORMS
1
2
3
4
14Vp-
27
µ
sec
29Vp-
27
µ
sec
29Vp-
27
µ
sec
60Vp-
27
µ
sec
