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Disassembly; Side Plate And Filer Board; Amplifier/Power Board And Led Board; Electrical Adjustment - Sony XM-7547 Service Manual

Stereo power amplifer
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DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.
3-1. SIDE PLATE AND FILTER BOARD
1 Three screws
(BTP3x8)
!™ CNP806 (2P)
!£ Screw (BTP3x8)
!¢ Fan motor block
7 Three screws
(BTP3x8)
8 Side panel (R)

3-2. AMPLIFIER/POWER BOARD AND LED BOARD

!™ Sub heat sink
(Amplifier)
2 Three screws
(P4x40)
0 Screw
(BTP3x8)
9 Four screws
(P3x14)
8 Four screws
(P3x10)
!£ Four insulating sheets
(AMP)
!¢ Two screws
(P2x10)
!∞ LED board
!§ LED holder
SECTION 3
2 Four screws
(BTP3x8)
3 Bottom plate
!∞ Screw (BTP3x8)
!§ Filter board
4 Three screws (BTP3x8)
6 Side panel (L)
5 Two screws (BTP3x8)
!¡ Auto fuse
(F901 to 904)
9 Two screws (M4)
0 Cover
3 Six screws
(BVTP3x14)
4 Retainers
5 Two screws
(BVTP3x10)
6 Power board
7 Amplifier board
!¡ Three screws
(P3x6)
1 Four screws
(BTP3x12)

ELECTRICAL ADJUSTMENT

IDLING CURRENT ADJUSTMENT
• Perform adjustments in the HI-VOLTAGE mode.
1 Adjustment point
Semi-fixed resistors VR101, VR201, VR301, VR401 of ampli-
fier 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
terminal, and GND terminal.
3. Rotate the above semi-fixed resistors completely in the counter-
clockwise 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 direction:
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 .
A channel :
Voltage between TP101 and TP102: Use VR101 of the ampli-
fier board
B channel :
Voltage between TP201 and TP202: Use VR201 of the ampli-
fier board
C channel :
Voltage between TP301 and TP302: Use VR301 of the ampli-
fier board
D channel :
Voltage between TP401 and TP402: Use VR401 of the ampli-
fier board
7
7
SECTION 4
Adjustment Location
- AMPLIFIER BOARD - (Component side)
TP101(A-CH)
TP201(B-CH)
TP301(C-CH)
TP102(A-CH)
TP202(B-CH)
TP302(C-CH)
IDLING
VR101
VR201
VR301
(A-CH)
(B-CH)
(C-CH)
Digital voltmeter
TP101(A-CH)
TP201(B-CH)
TP102(A-CH)
TP301(C-CH)
TP202(B-CH)
TP401(D-CH)
TP302(C-CH)
TP402(D-CH)
TP401(D-CH)
TP402(D-CH)
IDLING
VR401
(D-CH)

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