Sony XM-7527 Service Manual ▷ View online
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SECTION 3
DISASSEMBLY
Note:
Follow the disassembly procedure in the numerical order given.
3-1. SIDE PLATE AND BOTTOM PLATE
3-2. AMPLIFIER/POWER BOARD AND LED BOARD
1
Two screws
(BTP3x8)
0
Two screws
(BTP3x8)
4
Screw
(BTP3x8)
5
Filter board
2
Three screws
(BTP3x8)
6
Two screws
(BTP3x8)
!¢
Two screws
(M4)
3
Bottom plate
Heat sink block
!§
Auto fuse (F901)
!¶
Auto fuse (F902)
9
Side panel (L)
!£
Side panel (R)
!™
Screw (BTP3x8)
7
Screw (BTP3x8)
8
Screw (BTP3x8)
!¡
Screw (BTP3x8)
!∞
Cover
2
Two screws
(P4X40)
8
Three screws
(P3X8)
!£
Two insulating sheets
(AMP)
!™
Sub heat sink
(Amplifier)
!¡
Three screws
(P3X6)
9
Two screws
(P3X14)
3
Three screws (BVTP3X14)
0
Screw (BTP3X8)
1
Three screws (BTP3x12)
5
Screw (BVTP3X10)
4
Retainer
6
Power board
7
Amplifier board
!¢
Two screws (BTP 2x10)
!∞
LED board
!§
LED holder
8
SECTION 4
ELECTRICAL ADJUSTMENTS
Idling Current Adjustment
• Perform adjustments in the HI-VOLTAGE mode.
1 Adjustment point
Semi-fixed resistors VR101, VR201 of amplifier board.
2 Precautions on adjustments
1. Set the RCA input terminal to open.
2. Apply a voltage of 14.4V between the +12V terminal, REMOTE
1. Set the RCA input terminal to open.
2. Apply a voltage of 14.4V between the +12V terminal, REMOTE
terminal, and GND terminal.
3. Rotate the above semi-fixed resistors completely in the coun-
terclockwise direction while observing the component side.
4. Check that the voltage at the adjustment point becomes 0 mV
in step 2.
5. Fine adjustments may be required according to the characteris-
tics of the MOS-FET used.
• When adjusting the idling current
Rotating the semi-fixed resistor in the clockwise direction:
In creases the idling current
Rotating the semi-fixed resistor in the counterclockwise direc tion:
Decreases the idling current
In creases the idling current
Rotating the semi-fixed resistor in the counterclockwise direc tion:
Decreases the idling current
* Take note that rotating excessively in the clockwise direction
will increase the idling current suddenly.
3 Approximate adjustment values
Adjust as follows so that the following voltages become
0.4 to 0.5 mV .
0.4 to 0.5 mV .
L channel :
Voltage between TP101 and TP102: Use VR101 of the ampli-
fier board
R channel :
Voltage between TP201 and TP202: Use VR201 of the ampli-
fier board
Voltage between TP101 and TP102: Use VR101 of the ampli-
fier board
R channel :
Voltage between TP201 and TP202: Use VR201 of the ampli-
fier board
Digital voltmeter
TP101(L-CH)
TP201(R-CH)
TP201(R-CH)
TP102(L-CH)
TP202(R-CH)
TP202(R-CH)
- AMPLIFIER BOARD - (Component side)
Adjustment Location
Connection :
IDLING
(R-CH) VR201
VR101 (L-CH)
TP202
TP201
TP102
TP101
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