Sony XM-7547 Service Manual ▷ View online
4
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
5
6
7
7
SECTION 3
DISASSEMBLY
Note:
Follow the disassembly procedure in the numerical order given.
3-1. SIDE PLATE AND FILTER BOARD
3-2. AMPLIFIER/POWER BOARD AND LED BOARD
!™
CNP806 (2P)
1
Three screws
(BTP3x8)
2
Four screws
(BTP3x8)
3
Bottom plate
6
Side panel (L)
8
Side panel (R)
7
Three screws
(BTP3x8)
!¡
Auto fuse
(F901 to 904)
!£
Screw (BTP3x8)
!∞
Screw (BTP3x8)
4
Three screws (BTP3x8)
5
Two screws (BTP3x8)
9
Two screws (M4)
0
Cover
!§
Filter board
!¢
Fan motor block
1
Four screws
(BTP3x12)
3
Six screws
(BVTP3x14)
!™
Sub heat sink
(Amplifier)
2
Three screws
(P4x40)
!¡
Three screws
(P3x6)
8
Four screws
(P3x10)
!£
Four insulating sheets
(AMP)
9
Four screws
(P3x14)
0
Screw
(BTP3x8)
4
Retainers
5
Two screws
(BVTP3x10)
6
Power board
7
Amplifier board
!¢
Two screws
(P2x10)
!∞
LED board
!§
LED holder
SECTION 4
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.
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
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:
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 .
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
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
TP401(D-CH)
TP201(B-CH)
TP101(A-CH)
TP102(A-CH)
TP202(B-CH)
TP402(D-CH)
IDLING
VR401
(D-CH)
(D-CH)
VR301
(C-CH)
(C-CH)
IDLING
VR201
(B-CH)
(B-CH)
VR101
(A-CH)
(A-CH)
TP301(C-CH)
TP302(C-CH)
Digital voltmeter
TP101(A-CH)
TP201(B-CH)
TP301(C-CH)
TP401(D-CH)
TP201(B-CH)
TP301(C-CH)
TP401(D-CH)
TP102(A-CH)
TP202(B-CH)
TP302(C-CH)
TP402(D-CH)
TP202(B-CH)
TP302(C-CH)
TP402(D-CH)
- AMPLIFIER BOARD - (Component side)
Adjustment Location