Sony XM-ZR1252 Service Manual ▷ View online
XM-ZR1252
9
2-2. MAIN BOARD SECTION
2-3. LED BOARD
three screws
(+BTP 3 s 8)
(+BTP 3 s 8)
CNP904 (2P)
three screws
(+BTP 3 s 8)
(+BTP 3 s 8)
three screws
(+BTP 3 s 8)
(+BTP 3 s 8)
screw
(+BTP 3 s 8)
(+BTP 3 s 8)
After unfastening the screw,
taping with the screw inserted
facilitates the work.
taping with the screw inserted
facilitates the work.
MAIN board section
heat sink (MAIN)
screw
(+P 2.6 s 5)
(+P 2.6 s 5)
screw
(+BTP 3 s 8)
(+BTP 3 s 8)
screw
(+BVTP 3 s 16)
(+BVTP 3 s 16)
plate (top)
LED board
heat sink (main)
XM-ZR1252
10
2-4. MAIN BOARD
panel (front)
MAIN board
two screws
(+BTP 3 s 8)
(+BTP 3 s 8)
screw
(+P 3 s 8)
(+P 3 s 8)
screw
(+P 3 s 8)
(+P 3 s 8)
XM-ZR1252
XM-ZR1252
11
11
SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAM
2
3
3
PRE AMP
IC301 (1/2)
DIFFERENTIAL
AMP
Q151
PROTECTOR
Q153
POWER
AMP
Q161,164
OVERLOAD
DET
Q163,166
DRIVE
AMP
Q155
DRIVE
AMP
Q159
DIFFERENTIAL
AMP
Q152
POWER
AMP
Q162,165
DRIVE
AMP
Q156
DRIVE
AMP
Q160
BIAS
Q257,
258
MUTE
Q103
MUTE
Q203
CN902 (1/2)
CN902 (2/2)
D301
INPUT
L
(BTL)
SPEAKER OUT
L
R
SWITCH
Q102
REM
+12V
GND
9
DIFFERENTIAL
AMP
Q251
POWER
AMP
Q261,264
OVERLOAD
DET
Q263,266
DRIVE
AMP
Q255
DRIVE
AMP
Q259
DIFFERENTIAL
AMP
Q252
POWER
ON/OFF
ON/OFF
Q913
POWER
AMP
Q262,265
DRIVE
AMP
Q256
DRIVE
AMP
Q260
CN901
L
HIGH LEVEL
INPUT/
SENSING POWER ON
R
L
OUTPUT
(THROUGH)
R
SWITCH
Q202
ZERO LEVEL
PROTECT
Q506,507
15
1
2
2
14
12
B+
SWITCH
Q912
OVER VOLTAGE
DETECT
Q914
REF.
REG
REG
CN903 (2/2)
F901
16
+38V
–41V
+41V
SWITCHING
DRIVER
Q905,906
SWITCHING
DRIVER
Q903,904
DRIVER
Q901
14V REG.
Q504
–14V REG.
Q505
PROTECTOR
DETECT
Q908,909
DRIVER
Q902
8
10
11
LED901
POWER/
PROTECTOR
DC-DC
CONVERTER
TRANSFORMER
T901
D503
D504
RECT
D507,508
D506
D505
DC-DC CONVERTER
IC901
• Signal path
: AUDIO
: AUDIO
CN903 (1/2)
BTL
INHIBIT
SWITCH
Q906
R
(PROTECTOR)
LED902
(ILLUMINATION)
G
(POWER)
R
1
25A
F902
25A
GAIN CONTROL/
LOW BOOST AMP
IC302 (1/2)
PRE AMP
IC301 (2/2)
2
3
3
THERMAL DET
IC501 (1/2)
LOW BOOST
(40Hz)
VR302
RV301-1
RV301-2
RV302-1
RV302-2
RV302-2
LEVEL
RV301
-2
-1
1
7
TEMP.DET
TH502,503
TH502,503
TEMP.DET
TH501
DC OFF DET
Q501,502
HPF
Q201
PROTECT
SWITCH
Q503
1
3
THERMAL DET
IC501 (2/2)
5
7
–38V
BIAS
Q157,
158
3
D901
+41V
PROTECTOR
Q154
–41V
PROTECTOR
Q253
+41V
PROTECTOR
Q254
–41V
6
5
5
LPF
Q301
HPF
Q101
B+
SWITCH
Q911
GAIN CONTROL/
LOW BOOST AMP
IC302 (2/2)
7
5
EQ
EQ
+14V
–14V
–
+
–
+
–
+
–
+
FILTER
(80Hz)
SW301
HP
LP
OFF
XM-ZR1252
XM-ZR1252
12
12
For Schematic Diagrams.
Note:
• All capacitors are in
• All capacitors are in
μF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω and
1
/
4
W or less unless otherwise
specifi ed.
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
• A : B+ Line.
• B : B– Line.
• Power voltage is dc 14.4V and fed with regulated dc power
• B : B– Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from +12V and REM terminals.
• Voltage is dc with respect to ground under no-signal
condition.
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F :
F :
AUDIO
For Printed Wiring Boards.
Note:
• X : Parts extracted from the component side.
•
• X : Parts extracted from the component side.
•
: Pattern from the side which enables seeing.
• Waveform
– MAIN Board –
– MAIN Board –
• Indication of transistor.
B
These are omitted.
C E
Q
C
B
These are omitted.
E
Note: The components identifi ed by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specifi ed.
• Note for Replacement of the Transistors
The transistors Q161, 162, 164, 165, 261 262, 264 and 265 have
two different ranks: P rank and Y rank.
The rank of these transistors need to be selected properly accord-
ing to each channel. When replacing any one of these transistors,
check its rank and replace with the appropriate transistor of the
same rank.
The transistors Q161, 162, 164, 165, 261 262, 264 and 265 have
two different ranks: P rank and Y rank.
The rank of these transistors need to be selected properly accord-
ing to each channel. When replacing any one of these transistors,
check its rank and replace with the appropriate transistor of the
same rank.
Rank
Q161, 164, 261, 264
Q162, 165, 262, 265
P
2SC5100-P
(8-729-024-79)
2SA1908-P
(8-872-024-76)
Y
2SC5100-Y
(8-729-024-80)
2SA1908-Y
(8-872-024-77)
DISCRIMINATION:
3.3 Vp-p
17.1
μsec
IC901
1 V/DIV, 5
μsec/DIV
A1908: 2SA1908
C5100: 2SC5100
C5100: 2SC5100
P: RANK P
Y: RANK Y
Y: RANK Y
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