Sony SA-C7 User manual

SA-C7
AEP Model
UK Model
E Model
SERVICE MANUAL
SPEAKER SYSTEM
9-873-686-01
2002C1600-1
© 2002.03
•SA-C7 is the speaker system
in CMT-C7NT.
SPECIFICATIONS
Ver 1.0 2002. 03
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON 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.
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
Speaker system Two-way, bass reflex
system
Speaker units 9 cm dia., cone type
woofer
2 cm dia., balance drive
tweeter
Rated impedance 6 ohms
Dimensions (w/h/d) Approx. 149 ×248 ×
220 mm
Mass Approx. 1.9 kg net per
speaker
Design and specifications are subject to change without notice.

2
SA-C7 SERVICE NOTE
[When bringing in the equipment for service]
The notice is shown on both Warranty Card and Repair Service column of operation manual, telling to bringing in both
of the equipment (HCD-C7NT) and speaker system (SA-C7) together to service station when service (repair) is needed.
[How to check speaker only]
When only speaker is brought in for service, check its operations by supplying both the power and the signal to theAMP
board of the speaker as shown below.
Check method :
1.Perform connection as shown below.
•DC regulated power supply 1(+5 V)
It functions to turn on the speaker relay driver.
•DC regulated power supply 2(±20 V)
It is desirable to use the DC regulated power supply of the dual tracking type that can supply its output voltages in two
polarities of positive and negative polarities. However, the two units of the DC regulated power supply that supplies
only a single output voltage can also be used. (See the figure below.)
•Audio signal generator
Output frequency : 1 kHz
Output voltage : 100mV p-p or less
Output impedance : 600 Ω
2.Turn on the main power of the DC regulated power supply 2.
Then turn on the main power of the DC regulated power supply 1(+ 5 V).
After that, input the output signal of the audio signal generator as shown.
3.Check that the LED (D831, D832 (BLUE)) turns on and the audio signal can be heard from the speaker.
Notes :
1For the speaker cord, disconnect it from the speaker or leave it open.
2Be careful not to apply an excessive input audio signal to the speaker.
3If the power voltage is less than +/- 14 V, the speaker relay will not be activated.
[Caution when removing the front panel]
The special screwdriver (Sony part code No. 7-640-005-55) of star type (six star type) is required to remove the front
panel.
9
8
7
6
5
4
3
2
1
DC regulated
power supply 2
Audio signal
generator
RELAY
SP-GND
+B
POWER-GND
-B
SHIELD GND
PRE-SIGNAL
CN801 AMP board
LED (BLUE)
Speaker
DC regulated
power supply 1
+5V
GND
GND
+
+
+20V
-20V
AUDIO SIGNAL
COM
-
-
DC regulated
power supply +
-
DC regulated
power supply +
-
7
6
5
4
3
+B
POWER-GND
-B
CN801
+20V
-20V

33
SA-C7
IC801
1
2
4
5
91
12
12
11
(11)
11
(11)
D831,832
– BACK LIGHT FOR SP2 –
•Semiconductor Location
(AMP Board)
•Semiconductor Location
(LED Board)
1-1. Printed Wiring Board
Ref. No. Location
D831 A-5
D832 A-5
Ref. No. Location
D821 B-3
IC801 C-1
Q821 B-1
Q822 C-2
Q823 C-2
Q824 C-3
SECTION 1
DIAGRAMS
Note on PrintedWiring Board:
•X: parts extracted from the component side.
•: Pattern from the side which enables seeing.
•Indication of transistor
B
These are omitted.
CE
Q

44
SA-C7
1-2. Schematic Diagram
Note on Schematic Diagram:
• 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 Ωand 1/4W or less unless otherwise
specified.
•2: nonflammable resistor.
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
•A: B+ Line.
•B: B– Line.
•Voltages and dc with respect to ground under no-signal
conditions.
no mark : AUDIO
•Voltages are taken with aVOM (Input impedance 10 MΩ).
Voltage variations maybenoteddue to normalproduction
tolerances.
•Signal path.
F: AUDIO (Analog)
D832
SELS5LED23C-STP15
D831
SELS5LED23C-STP15
C803
47/50V
D831,832
– BACK LIGHT FOR SP2 –

SECTION 2
EXPLODEDVIEWS
NOTE:
•-XX, -X mean standardized parts, so they may
have some differences from the original one.
•Items marked “*” are not stocked since they
are seldom required for routine service. Some
delayshouldbe anticipatedwhenordering these
items.
•Themechanicalpartswith noreference number
in the exploded views are not supplied.
•Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
5
SA-C7
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1X-4954-276-1 FRAME ASSY, GRILLE
24-234-735-11 SCREW, ORNAMENT
34-234-729-11 SCREW (P), ORNAMENT
44-234-725-21 PANEL, FRONT
54-234-730-01 PACKING (A)
6A-4727-504-A AMP BOARD, COMPLETE
71-681-713-11 LED BOARD
84-874-614-71 SCREW
94-234-724-21 CABINET, SPEAKER
10 1-757-788-22 CORD, CONNECTION
11 4-235-539-01 PLATE
12 4-234-726-21 BASE (STAND)
SP1 1-544-976-11 SPEAKER (2cm)
SP2 1-544-853-11 SPEAKER (9cm)
#1 7-685-662-79 SCREW +BVTP 4X14 TYPE2 N-S
#2 7-682-563-04 SCREW +B 4X12
#3 7-682-548-04 SCREW +B 3X8
#4 7-685-871-01 SCREW +BVTT 3X6 (S)
not
supplied
#4
#3
#1
#2
#2
1 2
3
4
7
not
supplied
not
supplied
not
supplied
(including Ref.No. 10)
8
9
11
12
6
10
SP2
5
5
#4
not
supplied
8
SP1

6
SECTION 3
ELECTRICAL PARTS LIST
SA-C7
NOTE:
•Due to standardization, replacements in the
parts list may be different from the parts
specifiedin thediagramsor the components
used on the set.
•-XX, -X mean standardized parts, so they
may have some difference from the original
one.
•Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
•CAPACITORS:
uF: µF
•COILS
uH: µH
•RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
•SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
The components identified by mark 0or
dotted line with mark 0are critical for safety.
Replace only with part number specified.
When indicating parts by reference number,
please include the board name.
AMP LED
A-4727-504-A AMP BOARD, COMPLETE
********************
1-757-788-22 CORD, CONNECTION
7-682-548-04 SCREW +B 3X8
< CAPACITOR >
C801 1-126-963-11 ELECT 4.7uF 20.00% 50V
C802 1-162-290-31 CERAMIC 470PF 10% 50V
C803 1-126-967-11 ELECT 47uF 20.00% 50V
C804 1-162-215-31 CERAMIC 47PF 5% 50V
C807 1-161-494-00 CERAMIC 0.022uF 25V
C811 1-126-953-11 ELECT 2200uF 20.00% 35V
C812 1-126-953-11 ELECT 2200uF 20.00% 35V
C813 1-164-159-21 CERAMIC 0.1uF 50V
C814 1-164-159-21 CERAMIC 0.1uF 50V
C821 1-126-382-11 ELECT 100uF 20.00% 16V
C824 1-136-169-00 FILM 0.22uF 5.00% 50V
< CONNECTOR >
*CN801 1-564-512-11 PLUG, CONNECTOR 9P
< DIODE >
D821 8-719-991-33 DIODE 1SS133T-77
< IC >
IC801 8-759-502-31 IC SI-18751
< TRANSISTOR >
Q821 8-729-141-30 TRANSISTOR 2SC3623ATP-LK
Q822 8-729-620-05 TRANSISTOR 2SC2603TP-EF
Q823 8-729-620-05 TRANSISTOR 2SC2603TP-EF
Q824 8-729-620-05 TRANSISTOR 2SC2603TP-EF
< RESISTOR >
R801 1-249-421-11 CARBON 2.2K 5% 1/4W F
R803 1-249-417-11 CARBON 1K 5% 1/4W F
R804 1-249-435-11 CARBON 33K 5% 1/4W
R807 1-249-437-11 CARBON 47K 5% 1/4W
R808 1-249-429-11 CARBON 10K 5% 1/4W
R809 1-249-429-11 CARBON 10K 5% 1/4W
R820 1-249-429-11 CARBON 10K 5% 1/4W
0R823 1-216-429-00 METAL OXIDE 270 5% 1W
0R824 1-249-381-11 CARBON 1 5% 1/4W F
R826 1-249-429-11 CARBON 10K 5% 1/4W
R827 1-249-441-11 CARBON 100K 5% 1/4W
R828 1-249-435-11 CARBON 33K 5% 1/4W
R831 1-260-330-11 CARBON 1.5K 5% 1/2W
< RELAY >
RY801 1-755-170-11 RELAY (12V)
**************************************************************
1-681-713-11 LED BOARD
**********
< CAPACITOR >
C831 1-164-159-21 CERAMIC 0.1uF 50V
C832 1-164-159-21 CERAMIC 0.1uF 50V
< CONNECTOR >
CN831 1-564-718-11 PIN, CONNECTOR (SMALL TYPE) 2P
< DIODE >
D831 6-500-095-01 DIODE SELS5LED 3C-STP15 (BACK LIGHT)
D832 6-500-095-01 DIODE SELS5LED 3C-STP15 (BACK LIGHT)
**************************************************************
MISCELLANEOUS
**************
SP1 1-544-976-11 SPEAKER (2cm)
SP2 1-544-853-11 SPEAKER (9cm)