Sony DXA-WZ7AV / MHC-WZ7AV Service Manual ▷ View online
9
DXA-WZ7AV
3.
Mode: Playback
4.
Repeat step 1 to 3 in playback (REV) mode.
5.
After the adjustments, apply suitable locking compound to the
pats adjusted.
pats adjusted.
SECTION 3
ELECTRICAL ADJUSTMENTS
2.
Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
Note:
Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
not satisfied, do the adjustment.
1.
Demagnetize the record/playback head with a head
demagnetizer.
demagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to the
parts adjust.
parts adjust.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
5.
The adjustments should be performed in the order given in this
service manual.
service manual.
6.
The adjustments should be performed for both L-CH and R-
CH.
CH.
7.
Switches and controls should be set as follows unless otherwise
specified.
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Procedure:
1.
1.
Mode: Playback
set
SPEAKER terminals (TM401)
L-CH, R-CH
L-CH, R-CH
+
–
–
level meter
test tape
P-4-A63J
(10 kHz, –10 dB)
P-4-A63J
(10 kHz, –10 dB)
Screw
position
position
L-CH
peak
peak
within
1 dB
1 dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1 dB
1 dB
Screw
position
position
R-CH
peak
peak
set
test tape
P-4-A63J
(10 kHz, –10 dB)
P-4-A63J
(10 kHz, –10 dB)
R-CH
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
SPEAKER terminals (TM401)
L-CH
L-CH
DECK SECTION
Tape
Signal
Used for
P-4-A63J
10 kHz, –10 dB
Azimuth Adjustment
0 dB=0.775 V
10
DXA-WZ7AV
• WAVEFORMS
SECTION 4
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
2
: nonflammable resistor.
•
5
: fusible resistor.
•
C
: panel designation.
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
• b
: Pattern from the side which enables seeing.
• Indication of transistor.
•
A
: B+ Line.
•
B
: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : TAPE
tion tolerances.
no mark : TAPE
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: AUDIO
E
: PB (TAPE)
a
: REC (TAPE)
• Abbreviation
EA
: Saudi Arabian model
SP
: Singapore model
TH
: Thai model
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.)
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
11.2
µ
s
15.9 Vp-p
5 V/DIV, 4
µ
s/DIV
1
Q301 collector (TAPE B REC)
– TC MAIN Board –
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
11
11
DXA-WZ7AV
4-1. Block Diagrams
: REC (TAPE)
: AUDIO
• Signal Path
• R-CH is omitted due to same as L-CH.
: PB (TAPE)
TAPE DECK
BLOCK
(CWM43RR23)
L-PB
MAIN TRANS
RELAY
DRIVE
Q601
RY601
AC
IN
R-PB
A SHUT
B SHUT
R-CH
L-REC
R-REC
R-CH
GND
MUTE
CONT
CONT
JW604
RY402
14
15
12
9
8
POWER AMP
IC501
Q536,537
5
2
IC301
L-PB
R-PB
R-CH
1
BIAS
8
7
16
5
6
7
IC303
CNT BIAS
REC SWITCH
Q312,314
REC CONT
Q308-310
PB SWITCH
Q303
PB CONT
Q306,307
BIAS
OSC
Q301
T301
BIAS
BIAS
E HOT
BIAS
SWITCH
Q304
BIAS
CONT
Q305
BIAS
21
I/O EXP DATA OUT
I/O EXPANDER
I/O EXP DATA IN
I/O EXP CLK
I/O EXP LAT
UNREG
EVER +4V
CN CHECK
AMP+9V
AMP+9V
M+9V
REC-L
REC-R
PB-R
PB-L
B SHUT
A SHUT
R-CH
R-CH
IC251
A/B
23
20
FR RY
19
SUR RY
11
PROTECT
REC/PB
22
A PLAY
B PLAY
A HALF
B HALF
REC(FWD)
REC (REW)
CAP M+
MOTOR
DRIVE
Q353,356
A TRG
SOLENOID
DRIVE
SOLENOID
DRIVE
Q351,355
B TRG
Q352,354
A PLAY
5
B PLAY
9
A HALF
6
B HALF
8
REC(FWD)
7
REC(REW)
10
CAP-M
24
HCD-WZ7AV
3
1
4
IC201
PROTECTOR
25
DO2
26
DI
3
CLK
4
LATCH
A TRG
B TRG
MUTE
Q533
MUTE
CONT
CONT
Q204,206
MUTE
Q501
R-CH
FRONT L
FRONT R
SURR L
SURR R
CENTER
TM401(1/2)
SPEAKER
FAN301
FAN
DRIVE
Q209,211,212
FAN
CONTROL
Q213
PROTECT
SWITCH
Q536,537
+VL
TH531
OVER HEAT
DETECTOR
17
PWR RY
18
FAN CNT
D501
D742
Q521
Q534,535
PROTECT
DETECTOR
Q403
RELAY
DRIVE
D101
+9V
REG
1
3
IC302
+VL
D103
AC3
AC3
D301
R-CH
D402
+3.3V
REG
Q101
D+3.3V
Q202
D202
D201
AC
DET
Q203,205
M+9V
-VL
AC2
TH
EA,SP
AC2
+VH
-VH
AC1
AC1
D102
D251
IC251
VCC
VCC
DBFB FB
STK MUTE
TA MUTE
FRONT-R
FRONT-L
RY401
8
3
9
POWER AMP(SL,SR,C)
IC701
MUTE
Q701
R-CH
TM401(2/2)
Q711
PROTECT
DETECTOR
Q401
RELAY
DRIVE
REAR-R
REAR-L
JW603
JW602
S601
VOLTAGE
SELECTOR
SWITCHING
REGULATOR
EVER+4V
RY403
13
15
14
MUTE
Q731
Q741
PROTECT
DETECTOR
CENTER
12
12
DXA-WZ7AV
4-2. Printed Wiring Board – TC MAIN Board –
•
: Uses unleaded solder.
IC301
IC303
IC201
IC302
IC251
1
1
3
2
16
15
3
1
C310
FROM
HCD-WZ7AV
FROM
HCD-WZ7AV
C605
Q213
D203
C415
TM401
C412
R412
R408
R409
Q401
D403
R406
R421
RY401
RY403
R420
R405
R402
R404
CN401
D401
R341
R340
TC MAIN BOARD
EA,SP
TH
TH
NO809
1
6
A
TO
SURROUND AMP BOARD
CN701
(Page 17)
C
TO
FRONT AMP BOARD
CN501
(Page 15 )
7
1
B
TO
SURROUND AMP
BOARD
NO703
(Page 17)
D
TO
FRONT AMP
BOARD
CN502
(Page 15)
12
C114
TH
+
-
SURR R
+
-
FRONT R
+
-
CENTER
SPEAKER
+
-
SURR L
+
-
FRONT L
1
2
17
16
• Semiconductor
Location
Ref. No.
Location
D101
C-9
D102
B-7
D103
A-7
D111
A-6
D201
I-4
D202
I-4
D203
F-2
D204
F-2
D205
E-3
D207
E-3
D208
E-3
D209
F-1
D251
G-3
D301
B-6
D351
E-5
D352
E-5
D401
I-3
D402
G-3
D403
I-3
D404
H-3
D911
C-2
IC201
I-4
IC251
G-4
IC301
I-10
IC302
A-7
IC303
J-8
Q101
A-6
Q202
I-5
Q203
H-5
Q204
E-2
Q205
H-5
Q206
E-2
Q209
E-2
Q211
F-2
Q212
F-2
Q213
E-1
Q301
F-9
Q302
H-10
Q303
H-9
Q304
G-8
Q305
F-8
Q306
H-8
Q307
H-9
Q308
H-8
Q309
H-8
Q310
H-8
Q311
G-9
Q312
G-9
Q313
G-9
Q314
G-9
Q351
E-5
Q352
E-5
Q353
E-5
Q354
E-4
Q355
E-4
Q356
E-4
Q401
I-4
Q403
H-4
Q601
C-2
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