Sony XM-7547 User manual

1
MICROFILM
XM-7547
US Model
Canadian Model
AEP Model
UK Model
E Model
SPECIFICATIONS
SERVICE MANUAL
STEREO POWER AMPLIFER

2
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. EXPLODEDVIEWS
6-1. Plate and Cover Section ...................................................... 17
6-2. Board and Heat Sink ........................................................... 18
7. ELECTRICAL PARTS LIST ........................................ 19
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.

3
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
1When the position of the MODE switch (S801/power board)
is set to HI-VOLTAGE :
Cut the jumper wire JW535 of the amplifier board.
2When 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. TESTTONE Function
1Press the TESTTONE button (S851/amplifier board) with the
power ON. The amplifier is normal if sound is produced from
the speaker.
2If no sound
: Problem causer by incorrect connecttion of the power supply
system or sperker system.
: The signals input by the RCAcable before the amplifier system
are abnormal.
Adjustment Location:
S851
TEST
TONE
JW535 JW690
JW502
- POWER BOARD - (Component side) - AMPLIFIER BOARD - (Component side)
S801
MODE

4
SECTION 2
GENERAL This section is extracted from
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 boar
d
7 Amplifier board
!¢ Two screws
(P2x10)
!∞ LED board
!§ LED holder
SECTION 4
ELECTRICAL ADJUSTMENT
IDLING CURRENT ADJUSTMENT
• Perform adjustments in the HI-VOLTAGE mode.
1Adjustment point
Semi-fixed resistors VR101, VR201, VR301, VR401 of ampli-
fier board.
2Precautions on adjustments
1. Set the RCA input terminal to open.
2. Apply a voltage of 14.4V between the +12Vterminal, 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 mVin
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.
3Approximate 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
TP401(D-CH)
TP201(B-CH)
TP101(A-CH)
TP102(A-CH) TP202(B-CH) TP402(D-CH)
IDLING
VR401
(D-CH)
VR301
(C-CH)
IDLING
VR201
(B-CH)
VR101
(A-CH)
TP301(C-CH)
TP302(C-CH)
Digital voltmeter
TP101(A-CH)
TP201(B-CH)
TP301(C-CH)
TP401(D-CH) TP102(A-CH)
TP202(B-CH)
TP302(C-CH)
TP402
(
D-CH
)
- AMPLIFIER BOARD - (Component side)
Adjustment Location

XM-7547
8
8
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – AMPLIFIER SECTION –
22 3
5 7 6 7 6 7 5
67
DIFFERENTIAL
AMP
Q104,106
DIFFERENTIAL
AMP
Q105,107
POWER AMP
(VOLTAGE STAGE)
Q108
BIAS
VR101,Q110
LEVEL SHIFT
Q101 OVERLOAD
Q113,115
OVERLOAD
Q114,116
5 7 6 7 5 7 6 7 6 7 5
67
DIFFERENTIAL
AMP
Q304,306
DIFFERENTIAL
AMP
Q305,307
LEVEL SHIFT
Q301
OVERLOAD
Q313,315
OVERLOAD
Q314,316
OFFSET
SET
Q857-861
CNJ807
8
2
3
9
4
1
10
6
7
5
CNP805
POWER AMP
(VOLTAGE STAGE)
Q109
POWER AMP
(VOLTAGE STAGE)
Q308
BIAS
VR301,Q310
POWER AMP
(VOLTAGE STAGE)
Q309
POWER AMP
(FINAL STAGE)
Q111-112
POWER AMP
(FINAL STAGE)
Q311-312
NFB ON
NFB OFF
NFB ON
NFB OFF
RY801(1/2)
RY801(2/2)
DIRECT
S806-1
DIRECT
S805-1
LINE SWITCH
Q102
LINE SWITCH
Q103
LOWBOOST
IC806-1
LOWBOOST
IC812-1
LINE SWITCH
Q302
LINE SWITCH
Q303
FAN CTL
Q852
CNP806
POWER
DRIVE
Q854
THERMAL
DET
TH851
POWER
CONTROL
Q853
FAN DRIVER
Q851
INVERTER
Q855
B-CH
D-CH
CN811
CN810
SPEAKER OUT
ON OFF
ON OFF
B-
B+
B-
B+
H.P.F
IC803-1 L.P.F IC805-1
L.P.F
IC804-1
FILTER
VR805-1 FILTER VR805-3
PRE AMP
IC807-1 H.P.F IC808-1 H.P.F IC809-1 L.P.F IC811-1
L.P.F
IC810-1
LEVEL
VR802-1 FILTER
VR806-1 FILTER VR806-3
X10-X1
FILTER
CNP808
CNJ808
CNJ808
CNP808
CNJ809
CNP809
CNP809
CNJ809
HPF
LPF
FLAT
HPF
LPF
FLAT
LOWBOOST
VR803-1
LOWBOOST
VR804-1
CNJ806
FN801
DC FAN MOTOR
INVERTER
Q856
+45V
+15V
-15V
-45V
T851 D854
D855
D856
D857
D858
D859
D861
D860
B+
B-CH
D-CH
TO
POWER
BOARD
CNB805
09
FILTER BOARD
AMPLIFIER BOARD
31
TEST TONE AMP
IC851-2 TEST TONE AMP
IC851-1
FILTER
FILTER
FILTER
S803-1
S801-1 S801-3
X10-X1
FILTER
S802-1 S802-3
S804-1
A
A+B MONO
C+D MONO
B
(MONO)
(MONO)
INPUT
C
D
SPEAKER OUT
B
A
C
D
2
1
2
1
2
57
6
TEST TONE
S851
22
3
33
M
5 7 6 7
PRE AMP
IC801-1 H.P.F IC802-1
LEVEL
VR801-1
• Signal path
: Audio

XM-7547
9
9
5-2. BLOCK DIAGRAM – POWER SECTION –
7
8
9
2
5
6
10
3
4
CNB805
CN802
CNJ801
TO
AMPLIFIER
BOARD
CNP805
BATTERY
GND
REMOTE
BATTERY
5
4
7
6
3
1
CNP804
POWER BOARD
OFFSET CONTROL
Q809-810 OFFSET LED
SET
Q804
THERMAL DETECTOR
(For H,S)
TH903
THERMAL DETECTOR
(For TRANS)
TH904
NFB
S802
SWITCH
Q901-902
SWITCH
Q904
SWITCH CTL
Q903
THERMAL
CONTROL
Q918
THERMAL
SWITCH
Q917
THERMAL
LED SWITCH
Q806
11
10
1
2
15
16
3
8
9
12
14
REF-REG
THERMAL SWITCH
TH905,Q919
DRIVER
Q921 INVERTER
Q924,926,928
DRIVER
Q920
INVERTER
Q925,927,929
T902
SWITCHING
CONTROL
Q922-923
11
10
1
2
15
3
8
9
12
14
REF-REG DRIVER
Q908 INVERTER
Q911,913,915
DRIVER
Q907
INVERTER
Q912,914,916
T901
SWITCHING
CONTROL
Q909-910
THERMAL SWITCH
TH902,Q906
SWITCH
Q905
D901
F903 (25A)
F904 (25A)
F901 (25A)
F902 (25A)
S801-1
HI-V
HI-C
+28V
-28V
TO
AMPLIFIER
BOARD
+28V
-28V
TO
AMPLIFIER
BOARD
D905
D912
D913
D906
IC903
DC DET
IC901
DC DET
DC-DC
CONVERTER
IC904
DC-DC
CONVERTER
IC902
THERMAL
DET
TH901 D904
D903
OVER CURRENT
CONTROL
Q807-808
OVER CURRENT
LED SWITCH
Q805
D908
D909
OR
D806
OR
OR
D907
16
MUTE CONTROL
D808,Q811 MUTE SWITCH Q812
OFFON
S801-3
MODE
HI-C HI-V
S801-4
D911
D910
MUTE ENABLER
IC813
D801
HI-VOLTAGE D802 HI-CURRENT
D803
OVER CURRENT
GG GR
D804
OFFSET
GR
D805
THERMAL
GR
B+
Q801
SWITCH Q802 SWITCH Q803 SWITCH
CNB804
LED BOARD
09
MODE
MODE
S801-2
D911
HI-V
HI-C
MODE
+12V
+12V
2
1
3
4
2
1
3
4
B +
B –
B +
B –
HI-V
HI-C
4
3
1
2

XM-7547
10
10
5-4. PRINTEDWIRING BOARD – LED/FILTER SECTION –
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.
•C: panel designation.
•U: B+ Line.
• Powrvoltageisdc 14.4V and fed with regulateddcpower
supply from +12V and REMOTE terminals.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark: POWER ON
*: Impossible to mersure
• Voltagesare takenwithaVOM (Input impedance 10MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F:AUDIO
For printed wiring boards.
Note:
•X: parts extracted from the component side.
5-3. IC BLOCK DIAGRAM
• POWER section
IC902, 904 µPC494G2
4
12 3 5 6 7 8
91016 15 14 13 12 11
ERROR
0.1V
REG.
REF.
OSC
ERROR
• Semiconductor
Location
Ref.No. Location
IC803 C-3
IC804 B-3
IC805 B-2
IC809 C-5
IC810 B-6
IC811 B-6
• Semiconductor
Location
Ref.No. Location
D801 A-4
D802 A-4
D803 A-2
D804 A-3
D805 A-1
Q801 A-2
Q802 A-3
Q803 A-1
A
B
C
1234567
R489
R289
R387
R487
C354
JW102
R486
R383
R183
R187
R287
R286
R484
R483
R481
R482
R485
C451
R284 R282
R285
C251 R490
R382
R384
R385
C351
R389
R386
R182
R184
R185
C151
R290
R283
R281
R390
R381
R181
R186
R190
R189
IC811
IC810
IC809
IC804
IC803
IC805
JW117
1-675-246- 11
09
FILTER BOARD
JW104
JW103
JW105
JW106
JW107
C452
C454
JW101
S802
JW118
CNJ809
C453C455
JW119
JW120
JW111
JW110
JW109
JW116
JW115
C352
C753
C754
C357
C356
JW121
JW122
C457
C456
JW114
JW113
JW112
C355
C353
S804
VR806
JW108
JW125
JW137
C254 C154
JW138
JW129
JW130
JW123
JW124
JW128
JW131
JW139
JW140
JW141
JW142
C751
C752
JW126
JW127
JW143
JW136
JW135
JW134
JW133
JW132
C252
C157
C256
C257
C156
C153
C253 C255
C155
C152
CNJ808
VR805
S803
S801
1
9
1
9
C
(Page 12)
S801
FILTER
(X1 X10)
VR805
FILTER
(50Hz — 400Hz)
S803
FILTER
(LPF OFF HPF)
S804
FILTER (X1 X10)
VR806
FILTER
(50Hz — 400Hz)
S802
FILTER
(LPF OFF HPF)
AMPLIFIER BOARD
CNP808
B
(Page 12)
AMPLIFIER BOARD
CNP809
1
A
234
09
1-675-245-
LED BOARD
11
CNB804
G
G
RGG
R
G
E
EE
RG
D802
D801
D803
D804
D805
17
D
(Page 16)
HI-CURRENT
POWER BOARD
CNP804
BLK +B BLU GND BLU TH BLU CFFS BLU O-C BLU H-V BLU H-C
R815
R812R811
Q803
R814
R808
R807
R806
R805
Q802
R813
R804
R803
R802
R810 R809
R801
Q801
D804
D803
D805
THERMAL OFFSET OVER CURRENT D801
HI-VOLTAGE
POWER/PROTECTOR MODE
D802