CMT-C7NT, SA-C7 - Sony Audio Service Manual (repair manual)

Model
CMT-C7NT SA-C7
Pages
6
Size
635.94 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-c7nt-sa-c7.pdf
Date

View Sony CMT-C7NT / SA-C7 Service Manual online

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 
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.
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 the AMP
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 
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 :
1
For the speaker cord, disconnect it from the speaker or leave it open.
2
Be careful not to apply an excessive input audio signal to the speaker.
3
If 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
3
3
SA-C7
IC801
1
2
4
5
91
12
1
2
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 Printed Wiring Board:
• X
: parts extracted from the component side.
: Pattern from the side which enables seeing.
• Indication of transistor
B
These are omitted.
C
E
Q
4
4
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 
 and 
1
/
4
 
W or less unless otherwise
specified.
2
: nonflammable resistor.
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are 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 a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal production
tolerances.
• Signal path.
F
: AUDIO (Analog)
D832
SELS5LED23C-STP15
D831
SELS5LED23C-STP15
C803
47/50V
D831,832
– BACK LIGHT FOR SP2 –

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Here you can view online and download Sony CMT-C7NT / SA-C7 Service Manual in PDF. CMT-C7NT / SA-C7 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony CMT-C7NT / SA-C7 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.