Sony DXA-WZ7AV / MHC-WZ7AV Service Manual ▷ View online
DXA-WZ7AV
E Model
SERVICE MANUAL
STEREO CASSETTE DECK AMPLIFIER
SPECIFICATIONS
Ver 1.0 2003. 06
• DXA-WZ7AV is deck and amplifier
section in MHC-WZ7AV.
Amplifier section
The following measured at AC 127, 220, 240 V,
50/60 Hz (Saudi Arabian model only)
The following measured at AC 220 V, 50/60 Hz
(Thai model only)
The following measured at AC 120, 220, 240 V,
50/60 Hz (except for Saudi Arabian and Thai models)
50/60 Hz (Saudi Arabian model only)
The following measured at AC 220 V, 50/60 Hz
(Thai model only)
The following measured at AC 120, 220, 240 V,
50/60 Hz (except for Saudi Arabian and Thai models)
Front speaker:
DIN power output (rated): 100 + 100 watts (6 ohms at
1 kHz, DIN)
Continuous RMS power output (reference):
140 + 140 watts (6 ohms at
1 kHz, 10% THD)
1 kHz, 10% THD)
Center speaker:
Continuous RMS power output (reference):
40 watts (6 ohms at 1 kHz,
10% THD)
10% THD)
Surround speaker:
Continuous RMS power output (reference):
40 + 40 watts (6 ohms at
1 kHz, 10% THD)
1 kHz, 10% THD)
Inputs
MIC 1/2 (phone jacks):
MIC 1/2 (phone jacks):
sensitivity 1 mV,
impedance 10 kilohms
impedance 10 kilohms
MD (VIDEO) IN L/R (phono jacks):
sensitivity 450 mV
(250 mV), impedance
47 kilohms
(250 mV), impedance
47 kilohms
DVD INPUT
FRONT, REAR, CENTER, WOOFER (phono jacks):
FRONT, REAR, CENTER, WOOFER (phono jacks):
sensitivity 450 mV,
impedance 47 kilohms
impedance 47 kilohms
Outputs
MD (VIDEO) OUT L/R (phono jacks):
MD (VIDEO) OUT L/R (phono jacks):
Voltage 250 mV,
impedance 1 kilohms
impedance 1 kilohms
SUB WOOFER OUT:
Voltage 350 mV,
impedance 1 kilohms
impedance 1 kilohms
VIDEO OUT (phono jacks):
max. output level
1 Vp-p, unbalanced, Sync
negative, load impedance
75 ohms
1 Vp-p, unbalanced, Sync
negative, load impedance
75 ohms
PHONES (stereo mini jack):
accepts headphones of
8 ohms or more
8 ohms or more
FRONT L/R:
Use only the supplied
speaker SS-WZ8
speaker SS-WZ8
SURROUND L/R:
Use only the supplied
speaker SS-RS400
speaker SS-RS400
CENTER:
Use only the supplied
speaker SS-CT400
speaker SS-CT400
Tape deck section
Recording system
4-track 2-channel, stereo
Frequency response
50 – 13,000 Hz (
±3 dB),
using Sony TYPE I
cassettes
cassettes
General
Power requirements
Saudi Arabian model:
Saudi Arabian model:
120 – 127 V, 220 V or
230 – 240 V AC, 50/60 Hz
Adjustable with voltage
selector
230 – 240 V AC, 50/60 Hz
Adjustable with voltage
selector
Thai model:
220 V AC, 50/60 Hz
Other models:
120 V, 220 V or
230 – 240 V AC, 50/60 Hz
Adjustable with voltage
selector
230 – 240 V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption
250 watts
Dimensions (w/h/d)
Amplifier/Tape deck:
Amplifier/Tape deck:
Approx. 255
× 135 ×
330 mm
Mass
Amplifier/Tape deck:
Amplifier/Tape deck:
Approx. 7.7 kg
Design and specifications are subject to change
without notice.
without notice.
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-877-480-01
2003F1678-1
© 2003.06
Tape deck
Section
Model Name Using Similar Mechanism
DXA-WZ5
Tape Transport Mechanism Type
CWM43RR23
2
DXA-WZ7AV
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE WITH
MARK
0
ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
TABLE OF CONTENTS
1. GENERAL
·········································································· 3
2. DISASSEMBLY
························································· 5
2-1. Case ··············································································· 5
2-2. Switching Power, DC Fan (FAN301) ···························· 6
2-3. TC MAIN Board ··························································· 6
2-4. FRONT AMP Board, SURROUND AMP Board ·········· 7
2-5. Front (TC) Panel Assy ··················································· 7
2-6. Tape mechanism deck (CWM43RR23) ························ 8
2-7. Lid (TC) Assy, Holder (A) Assy, Holder (B) Assy ········ 8
2-2. Switching Power, DC Fan (FAN301) ···························· 6
2-3. TC MAIN Board ··························································· 6
2-4. FRONT AMP Board, SURROUND AMP Board ·········· 7
2-5. Front (TC) Panel Assy ··················································· 7
2-6. Tape mechanism deck (CWM43RR23) ························ 8
2-7. Lid (TC) Assy, Holder (A) Assy, Holder (B) Assy ········ 8
3. ELECTRICAL ADJUSTMENTS
································· 9
4. DIAGRAMS
······································································ 10
4-1. Block Diagrams ··························································· 11
4-2. Printed Wiring Board – TC MAIN Board – ················ 12
4-3. Schematic Diagram – TC MAIN Board (1/2) – ·········· 13
4-4. Schematic Diagram – TC MAIN Board (2/2) – ·········· 14
4-5. Printed Wiring Board – FRONT AMP Board – ·········· 15
4-6. Schematic Diagram – FRONT AMP Board – ············· 16
4-7. Printed Wiring Board – SURROUND AMP Board – · 17
4-8. Schematic Diagram – SURROUND AMP Board – ···· 18
4-2. Printed Wiring Board – TC MAIN Board – ················ 12
4-3. Schematic Diagram – TC MAIN Board (1/2) – ·········· 13
4-4. Schematic Diagram – TC MAIN Board (2/2) – ·········· 14
4-5. Printed Wiring Board – FRONT AMP Board – ·········· 15
4-6. Schematic Diagram – FRONT AMP Board – ············· 16
4-7. Printed Wiring Board – SURROUND AMP Board – · 17
4-8. Schematic Diagram – SURROUND AMP Board – ···· 18
5. EXPLODED VIEWS
5-1. Front Panel Section ····················································· 19
5-2. Chassis Section ···························································· 20
5-3. Tape Mechanism Deck Section (CWM43RR23) ········ 21
5-2. Chassis Section ···························································· 20
5-3. Tape Mechanism Deck Section (CWM43RR23) ········ 21
6. ELECTRICAL PARTS LIST
······································· 22
[When bringing in the equipment for service]
In case of repairing, please bring the entire system set([HCD-
WZ7AV, DXA-WZ7AV],except for the speaker) to the service
station.
WZ7AV, DXA-WZ7AV],except for the speaker) to the service
station.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40
• Unleaded solder melts at a temperature about 40
°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350
°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
also be added to ordinary solder.
MODEL IDENTIFICATION
— BACK PANEL —
PARTS No.
MODEL
Saudi Arabian model
Thai model
Singapore model
PARTS No.
4-244-468-4
s
4-244-468-5
s
4-244-468-6
s
3
DXA-WZ7AV
This section is extracted
from instruction manual.
from instruction manual.
SECTION 1
GENERAL
Main unit
Deck A wl
Deck B wh
Deck B wh
A Z (eject) wk
Z B (eject) wj
Z B (eject) wj
ALPHABETICAL ORDER
A – L
BUTTON DESCRIPTIONS
Amplifier/Tape deck
wl
wh
wkwj
Remote control
ALBUM +/– 6 (12, 16)
CD wa (11, 14, 16, 22, 23, 28)
CENTER LEVEL +/– qa (9)
CLEAR ed (16, 17)
CLOCK/TIMER SELECT t;
CD wa (11, 14, 16, 22, 23, 28)
CENTER LEVEL +/– qa (9)
CLEAR ed (16, 17)
CLOCK/TIMER SELECT t;
(29, 30)
CLOCK/TIMER SET rl (10, 28,
29)
DIMMER 5 (31)
DISPLAY 4 (30, 31)
DVD eh (36)
EFFECT ra (24, 25, 27)
ENTER r; (10, 16, 18, 25, 28,
DISPLAY 4 (30, 31)
DVD eh (36)
EFFECT ra (24, 25, 27)
ENTER r; (10, 16, 18, 25, 28,
29)
EQ EDIT rs (25)
FM MODE wj (20)
GROOVE qh (24, 27)
KARAOKE/MPX rh (26)
KEY CONTROL
FM MODE wj (20)
GROOVE qh (24, 27)
KARAOKE/MPX rh (26)
KEY CONTROL
#
/
2
qd (27)
MD (VIDEO) rd (35)
MOVIE MODE qk (24, 27)
MUSIC MODE qj (24, 25, 27)
NEXT rg (13, 14, 17)
Number buttons wf (14, 17)
ON SCREEN wh (32)
MOVIE MODE qk (24, 27)
MUSIC MODE qj (24, 25, 27)
NEXT rg (13, 14, 17)
Number buttons wf (14, 17)
ON SCREEN wh (32)
PLAY MODE/DIRECTION rk
(12, 16, 21, 22, 23, 27)
PRESET –/+ ws (18, 19)
PREV rf (13, 14, 17)
PROGRAM EDIT ek (22)
PRO LOGIC qf (9, 26)
REPEAT wk (15)
SELECT wd
SLEEP wl (28)
SPECIAL MENU wg (17)
SURROUND ql (25)
SURROUND LEVEL +/– q; (9)
TAPE A/B ej (21, 22, 23, 27, 28)
TEST TONE el (9)
TUNER/BAND 9 (18, 19, 20,
PREV rf (13, 14, 17)
PROGRAM EDIT ek (22)
PRO LOGIC qf (9, 26)
REPEAT wk (15)
SELECT wd
SLEEP wl (28)
SPECIAL MENU wg (17)
SURROUND ql (25)
SURROUND LEVEL +/– q; (9)
TAPE A/B ej (21, 22, 23, 27, 28)
TEST TONE el (9)
TUNER/BAND 9 (18, 19, 20,
23, 28)
TUNER MEMORY es (18)
TUNING –/+ eg (18, 20)
TUNING MODE rj (18, 19)
TV CH +/– 3 (35)
TV VOL +/– 2 (35)
TV/VIDEO ea (35)
VOL +/– qs (9, 28)
2CH/MULTI w; (36)
TUNING –/+ eg (18, 20)
TUNING MODE rj (18, 19)
TV CH +/– 3 (35)
TV VOL +/– 2 (35)
TV/VIDEO ea (35)
VOL +/– qs (9, 28)
2CH/MULTI w; (36)
?/1 (power) 1 (7, 28)
m/M (rewind/fast forward)
m/M (rewind/fast forward)
eg (12, 18, 21)
./> (go back/go forward)
ws (12, 18, 21)
nN (play) wd (12, 21, 22, 27)
X (pause) 7 (12, 21)
x (stop) 8 (12, 21, 22, 27)
X (pause) 7 (12, 21)
x (stop) 8 (12, 21, 22, 27)
M
/m/</, (cursor) qg (9, 28)
TV ?/1 e; (35)
RETURN O ef (14)
RETURN O ef (14)
ALPHABETICAL ORDER
A – O
P – Z
BUTTON DESCRIPTIONS
–
–
M
x
+
+
–
–
+
+
–
+
O
.
>
m
b
B
V
v
nN
X
+
–
–
wl
wa
w;
ql
qf
qg
qh
qs
qa
qd
1
3
2
wf
qj
qk
ws
wd
4
5
6
7
8
9
q;
wk
wj
wh
wg
–
–
M
x
+
+
–
–
+
+
–
+
O
.
>
m
b
B
V
v
nN
X
+
–
–
t;
rl
rk
rf
r;
ra
rs
el
ef
ed
es
ea
e;
eg
eh
ek
ej
rh
rd
rg
rj
4
DXA-WZ7AV
Perform the following procedures 1 to 7 to hook up your system using the supplied cords and
accessories. Middle Eastern model is used for illustration purpose.
accessories. Middle Eastern model is used for illustration purpose.
Preparation
Place the components as shown below.
1
Connect the system control cables to
the SYSTEM CONTROL connectors on
the tape deck.
the SYSTEM CONTROL connectors on
the tape deck.
Connect to the same numbered jack in the
order indicated on the rear panel.
order indicated on the rear panel.
Note
The system cable is used to send signals and electricity
between the components for interlinked operation.
Be sure to insert the connector horizontally until it
clicks into place. Otherwise the system will not operate
correctly.
between the components for interlinked operation.
Be sure to insert the connector horizontally until it
clicks into place. Otherwise the system will not operate
correctly.
2
Connect the speakers.
Connect the appropriate speaker cords from
the speaker terminals to the corresponding
SPEAKER terminals on the amplifier.
the speaker terminals to the corresponding
SPEAKER terminals on the amplifier.
Getting Started
Hooking up the system
AM loop antenna
FM lead antenna
CD player/Tuner
Amplifier/Tape deck
To front speaker (right)
To front speaker
(left)
(left)
To surround speaker (right)
To surround speaker (left)
To center speaker
Amplifier/
Tape deck
Tape deck
CD player/
Tuner
Tuner