Sony DXA-WZ8D / MHC-WZ8D Service Manual ▷ View online
9
DXA-WZ8D
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 (TM402)
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-WZ8D
• 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.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• 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 : FM
(
tion tolerances.
no mark : FM
(
) : CD
[
] : 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
: FM
E
: PB (TAPE)
a
: REC (TAPE)
J
: CD
• Abbreviation
AUS
: Australian model
E2
: 120V AC area in E model
E3
: 240V AC area in E model
E15
: 220-240V AC area in E model
EA
: Saudi Arabia model
KR
: Korean model
MX
: Mexican model
MY
: Malaysia model
PH
: Philippines model
RU
: Russian 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.
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(SIDE B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(SIDE A)
the parts face are indicated.
• Indication of transistor.
11
11
DXA-WZ8D
4-1. Block Diagram
: REC (TAPE)
: AUDIO
• Signal Path
• R-CH is omitted due to same as L-CH.
: PB (TAPE)
TAPE DECK
BLOCK
BLOCK
L-PB
TRANSFORMER
POWER
T302
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
12
TH VACS
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-WZ8D
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
TH
VACS
Q531,532
PROTECT
DETECTOR
Q403
RELAY
DRIVE
D101
+9V
REG
1
3
IC302
+VL
D103
AC3
AC3
AC4
AC4
D301
R-CH
D402
+3.3V
REG
Q101
D+3.3V
Q202
D202
D201
AC
DET
Q203,205
M+9V
-VL
AC2
AUS
E2, E3, E15,EA,
MY, SP, PH
MY, SP, PH
KR, TH
AEP, UK, RU
AC2
+VH
-VH
AC1
AC1
D102
DVD AC
DVD AC
D251
IC251
VCC
VCC
DVD MUTE
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-WZ8D
4-2. Printed Wiring Board – TC MAIN Board –
IC301
IC303
IC201
IC302
IC251
KR,TH
AEP,UK,RU E2,E3,E15,EA,MY,SP,PH
E2,E3,E15,EA,MY,SP,PH
1
1
3
2
16
15
3
1
C310
TC MAIN BOARD
C605
C232
C231
R232
R231
Q213
D203
TM401
R424
R426
R421
R420
R429
R430
R434
C406
JW109
D403
Q401
R412
R409
R408
R406
C410
R431
L401
C411
C415
C412
C404
C403
C409
L402
L405
RY403
R404
R405
R402
R402
RY401
CN401
HCD-WZ8D
HCD-WZ8D
SURR R
FRONT R
R341
12
FRONT AMP
SURROUND AMP
NO703
(Page 17)
D
R340
CENTER
SURR L
FRONT L
FRONT AMP
SURROUND AMP
D401
NO809
1
6
C
7
7
•
: Uses unleaded solder.
• 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-2
D207
E-3
D208
E-3
D209
F-2
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
F-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-3
Q403
H-4
Q601
C-2
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