Sony XM-7547 Service manual
XM-7547
SERVICE MANUAL
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
MICROFILM
STEREO POWER AMPLIFER
1
TABLE OF CONTENTS
1. SERVICE MODE ............................................................. 3
2. GENERAL .......................................................................... 4
3. DISASSEMBLY
3-1. Side Plate and Filer Board .................................................... 7
3-2. Amplifier/Power Board and LED Board .............................. 7
4. ELECTRICAL ADJUSTMENT .................................... 7
5. DIAGRAMS
5-1. Block Diagram – Amplifier Sction – .................................... 8
5-2. Block Diagram – Power Section – ........................................ 9
5-3. IC Block Diagram ............................................................... 10
5-4. Printed Wiring Board – LED/Filter Section –..................... 10
5-5. Schematic Diagram – Filter/Amplifier (1/3) Section –.......11
5-6. Printed Wiring Board – Amplifier Section –.......................12
5-7. Schematic Diagram – Amplifier (2/3) Section –................. 13
5-8. Schematic Diagram
– Power/Amplifier (3/3)/LED Section – ............................. 14
5-9. Printed Wiring Board – Power Section –............................15
6. EXPLODED VIEWS
6-1. Plate and Cover Section ...................................................... 17
6-2. Board and Heat Sink ........................................................... 18
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
7. ELECTRICAL PARTS LIST ........................................ 19
2
SECTION 1
SERVICE NOTE
Clearing the Protector During Repairs
• OVER CURRENT : Detects overcurrent during output.
• OFF SET : Detects DC offset at the speaker terminal.
1. Clearing the OVER CURRENT protector
1 When the position of the MODE switch (S801/power board)
is set to HI-VOLTAGE :
Cut the jumper wire JW535 of the amplifier board.
2 When the position of the MODE switch (S801/power board)
is set to HI-CURRENT :
Cut the jumper wire JW690 of the amplifier board.
2. Clearing the OFF SET protector
• Cut the jumper wire JW502 of the amplifier board.
3. TEST TONE Function
1 Press the TEST TONE button (S851/amplifier board) with the
power ON. The amplifier is normal if sound is produced from
the speaker.
2 If no sound
: Problem causer by incorrect connecttion of the power supply
system or sperker system.
: The signals input by the RCA cable before the amplifier system
are abnormal.
Adjustment Location:
- POWER BOARD - (Component side) - AMPLIFIER BOARD - (Component side)
S801
MODE
JW535
S851
TEST
TONE
JW502
JW690
3
SECTION 2
GENERAL
This section is extracted from
instruction manual.
4
5
6
SECTION 3
)
)
d
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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)
2
Four screws
(BTP3x8)
3
Bottom plate
ELECTRICAL ADJUSTMENT
IDLING CURRENT ADJUSTMENT
• Perform adjustments in the HI-VOLTAGE mode.
1 Adjustment point
Semi-fixed resistors VR101, VR201, VR301, VR401 of amplifier board.
SECTION 4
Adjustment Location
- AMPLIFIER BOARD - (Component side)
!™
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)
!§
3
Six screws
(BVTP3x14)
!∞
Screw (BTP3x8)
Filter board
4
Three screws (BTP3x8)
6
Side panel (L)
5
Two screws (BTP3x8
!¡
Auto fuse
(F901 to 904)
9
0
Cover
4
Retainers
5
T wo screws
(BVTP3x10)
Two screws (M4
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 counterclockwise 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 characteristics 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 amplifier board
B channel :
Voltage between TP201 and TP202: Use VR201 of the amplifier board
C channel :
Voltage between TP301 and TP302: Use VR301 of the amplifier board
D channel :
Voltage between TP401 and TP402: Use VR401 of the amplifier board
TP101(A-CH)
TP102(A-CH)
IDLING
VR101
(A-CH)
TP101(A-CH)
TP201(B-CH)
TP301(C-CH)
TP401(D-CH)
TP201(B-CH)
TP202(B-CH)
VR201
(B-CH)
TP102(A-CH)
TP202(B-CH)
TP302(C-CH)
TP402
TP301(C-CH)
TP302(C-CH)
D-CH
TP401(D-CH)
IDLING
VR301
(C-CH)
Digital voltmeter
TP402(D-CH)
VR401
(D-CH)
8
Four screws
(P3x10)
!£
Four insulating sheets
(AMP)
!¡
!¢
T wo screws
(P2x10)
!∞
LED board
!§
LED holder
Three screws
(P3x6)
6
Power boar
7
Amplifier board
1
Four screws
(BTP3x12)
7
7
XM-7547
5-1. BLOCK DIAGRAM – AMPLIFIER SECTION –
SECTION 5
DIAGRAMS
INPUT
(MONO)
(MONO)
ON
DIRECT
ON
S805-1
OFF
DIFFERENTIAL
DIFFERENTIAL
DIRECT
S806-1
OFF
DIFFERENTIAL
DIFFERENTIAL
AMP
Q104,106
AMP
Q105,107
AMP
Q304,306
AMP
Q305,307
POWER AMP
(VOLTAGE STAGE)
Q108
BIAS
VR101,Q110
POWER AMP
(VOLTAGE STAGE)
Q109
NFB OFF
POWER AMP
(VOLTAGE STAGE)
Q308
BIAS
VR301,Q310
POWER AMP
(VOLTAGE STAGE)
Q309
NFB OFF
POWER AMP
(FINAL STAGE)
Q111-112
NFB ON
RY801(1/2)
POWER AMP
(FINAL STAGE)
Q311-312
NFB ON
RY801(2/2)
OVERLOAD
Q114,116
OVERLOAD
Q113,115
OVERLOAD
Q314,316
OVERLOAD
Q313,315
B-CH
D-CH
SPEAKER OUT
CN810
A
B
CN811
C
D
SPEAKER OUT
A+B
C+D
MONO
MONO
LINE SWITCH
Q102
PRE AMP
CNJ807
A
B
B-CH
IC801-1
5 7 6 7
LEVEL
VR801-1
H.P.F
IC802-1
CNP808
22
CNJ808
H.P.F
IC803-1
5 7 6 7 6 7
VR805-1
S801-1
FILTER
FILTER
L.P.F
IC804-1
X10-X1
FILTER
VR805-3
L.P.F
IC805-1
S801-3
FLAT
HPF
LPF
FILTER
S803-1
CNJ808
3
CNP808
FILTER BOARD
PRE AMP
IC807-1
C
D
5 7 6 7 5 7 6 7 6 7
D-CH
LEVEL
VR802-1
TEST TONE
TEST TONE AMP
IC851-2
2
3
S851
H.P.F
IC808-1
1
CNP809
TEST TONE AMP
IC851-1
6
5
22
CNJ809
7
H.P.F
IC809-1
FILTER
VR806-1
S802-1
FILTER
L.P.F
IC810-1
X10-X1
FILTER
VR806-3
FILTER
L.P.F
IC811-1
S802-3
FLAT
HPF
LPF
FILTER
S804-1
CNJ809
33
CNP809
3
LOWBOOST
VR803-1
LOWBOOST
5
6
LOWBOOST
5
6
LOWBOOST
VR804-1
IC806-1
B+
LEVEL SHIFT
Q101
B-
IC812-1
B+
LEVEL SHIFT
Q301
B-
LINE SWITCH
Q103
7
LINE SWITCH
Q302
LINE SWITCH
Q303
7
CNP805
POWER
BOARD
CNB805
CNJ806
INVERTER
Q855
INVERTER
Q856
CNP806
B+
212
T851
M
1
D854
D855
D860
D861
AMPLIFIER BOARD
FN801
DC FAN MOTOR
D856
D857
D858
D859
+45V
+15V
-15V
-45V
OFFSET
SET
Q857-861
8
TO
2
3
9
4
1
10
6
7
5
09
FAN CTL
Q852
POWER
DRIVE
Q854
THERMAL
DET
TH851
FAN DRIVER
Q851
POWER
CONTROL
Q853
• Signal path
: Audio
8
8
5-2. BLOCK DIAGRAM – POWER SECTION –
XM-7547
AMPLIFIER
BOARD
CNP805
POWER BOARD
CNB805
OFFSET CONTROL
7
TO
8
9
2
5
6
10
3
4
Q809-810
MUTE CONTROL
D808,Q811
MODE
S801-3
HI-C HI-V
THERMAL DETECTOR
(For H,S)
TH903
THERMAL DETECTOR
(For TRANS)
TH904
OFFSET LED
MUTE SWITCH
Q812
OVER CURRENT
CONTROL
Q807-808
OVER CURRENT
LED SWITCH
Q805
NFB
S802
OFFON
D908
OR
D909
OR
SET
Q804
MUTE ENABLER
THERMAL
CONTROL
4
3
Q918
IC813
Q803
SWITCH
D805
THERMAL
GR
B+
LED BOARD
D912
D913
CNP804
5
4
7
6
3
1
B +
+28V
TO
AMPLIFIER
BOARD
-28V
B –
D801
HI-VOLTAGE
GG GR
CNB804
D802
HI-CURRENT
MODE
HI-C
T902
S801-1
HI-V
D806
OR
1
2
HI-C
D907
THERMAL
SWITCH
Q917
LED SWITCH
MODE
S801-4
THERMAL
Q806
HI-V
D910
D911
THERMAL SWITCH
TH905,Q919
IC903
DC DET
2
3
4
1
12
14
1
2
15
16
3
REF-REG
DC-DC
CONVERTER
IC904
DRIVER
11
Q921
10
DRIVER
8
Q920
9
SWITCHING
CONTROL
Q922-923
INVERTER
Q924,926,928
INVERTER
Q925,927,929
OVER CURRENT
Q801
SWITCH
D803
Q802
SWITCH
D804
OFFSET
GR
+12V
BATTERY
GND
BATTERY
+12V
REMOTE
CN802
CNJ801
09
F903 (25A)
F904 (25A)
F901 (25A)
F902 (25A)
D901
SWITCH
Q901-902
SWITCH CTL
Q903
SWITCH
Q904
SWITCH
Q905
THERMAL
DET
TH901
HI-C
MODE
S801-2
HI-V
D903
D904
D911
2
1
IC901
DC DET
THERMAL SWITCH
TH902,Q906
12
REF-REG
14
3
4
1
2
15
16
3
DC-DC
CONVERTER
IC902
DRIVER
11
Q908
10
DRIVER
8
Q907
9
SWITCHING
CONTROL
Q909-910
INVERTER
Q911,913,915
INVERTER
Q912,914,916
T901
D905
D906
B +
+28V
TO
AMPLIFIER
BOARD
-28V
B –
9
9
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