Sony DXA-WZ88D / MHC-WZ88D Service Manual ▷ View online
9
DXA-WZ88D
2-7. TAPE MECHANISM DECK (CWM43RR602)
4
two screws
(+BVTP 2.6
(+BVTP 2.6
×
8)
qh
screw
(+PTPWH 2.6
(+PTPWH 2.6
×
8)
qa
screw
(+PTPWH 2.6
(+PTPWH 2.6
×
8)
1
six screws
(+BVTP 2.6
(+BVTP 2.6
×
8)
2
tape mechanism deck
(CWM43RR602)
3
5
four claws
6
base lock
q;
holder (lock)
7
lever (R)
9
lever (C)
qj
earth read
qs
earth read
ql
claw
qd
claw
w;
button (eject B)
qg
button (eject A)
qk
spring (eject)
qf
spring (eject)
8
lever (L)
10
DXA-WZ88D
9
screw
(+BVTP 2.6
(+BVTP 2.6
×
8)
1
claw
4
TC holder (B)
2
damper
6
damper
3
spring (lid)
5
claw
7
spring (lid)
8
TC holder (A)
qs
lid (TC) assembly
qa
retainer board
q;
cover (lid)
2-8. TC HOLDER (A), TC HOLDER (B), LID (TC) ASSY
11
DXA-WZ88D
SECTION 3
ELECTRICAL ADJUSTMENTS
[Record/Playback Head Azimuth Adjustment]
Procedure:
1. Mode : Playback
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 1 dB of peak.
so that outputs match within 1 dB of peak.
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
DECK SECTION 0 dB=0.775V
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.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
3. After the adjustments, apply suitable locking compound to
the parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual.
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Signal
Used for
Tape
P-4-A63J
10 kHz, –10 dB
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to
5. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Record/Playback/Erase Head
3. Mode: Playback
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
Azimuth Adjustment
adjustment screws
Note: Refer to 2-8. TC Holder (A), TC Holder (B),
Lid (TC) Assy (see page 10)
Lid (TC) Assy (see page 10)
12
DXA-WZ88D
SECTION 4
DIAGRAMS
For Schematic Diagrams.
Note:
• All capacitors are in
Note:
• All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
2
: nonflammable resistor.
•
5
: fusible resistor.
•
C
: panel designation.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjusment 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 production
tolerances.
No mark: DVD STOP
tolerances.
No mark: DVD STOP
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: AUDIO
E
: PB (TAPE)
a
: REC (TAPE)
• Abbreviation
AR
: Argentine model.
AUS
: Australian model.
E3
: 240 V AC area in E model.
E12
: 220-240 V AC area in E model.
E13
: 220-230 V AC area in E model.
E15
: 220-240 V AC area in E model.
E51
: Chilean and peruvian models.
EA
: Saudi Arabia model.
PL
: Phillippines model.
SP
: Singapore and Malaysia models.
TH
: Thai model.
For Printed Wiring Boards.
Note:
•
Note:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
• Indication of transistor.
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
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B)
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.
Note: The components identified by mark
0
or dotted
line with mark
0
are critical for safety.
Replace only with part number specified.
1
Q301 collector (TAPE B REC)
11.2
µ
s
15.9 Vp-p
5 V/DIV, 4
µ
s/DIV
• Waveforms
– TC MAIN Board –
– TC MAIN Board –
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