Sony CMT-C7NT / SA-C7 Service Manual ▷ View online
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.
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.
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.
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.)
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
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.
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
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.
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
power supply
+
-
DC regulated
power supply
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.
• All capacitors are in µF unless otherwise noted. p: pF.
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.
•
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
no mark : AUDIO
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
tolerances.
• Signal path.
F
: AUDIO (Analog)
D832
SELS5LED23C-STP15
D831
SELS5LED23C-STP15
C803
47/50V
D831,832
– BACK LIGHT FOR SP2 –
SECTION 2
EXPLODED VIEWS
NOTE:
•
-XX, -X mean standardized parts, so they may
have some differences from the original one.
have some differences 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.
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
•
The mechanical parts with no reference number
in the exploded views are not supplied.
in the exploded views are not supplied.
•
Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
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
1
X-4954-276-1 FRAME ASSY, GRILLE
2
4-234-735-11 SCREW, ORNAMENT
3
4-234-729-11 SCREW (P), ORNAMENT
4
4-234-725-21 PANEL, FRONT
5
4-234-730-01 PACKING (A)
6
A-4727-504-A AMP BOARD, COMPLETE
7
1-681-713-11 LED BOARD
8
4-874-614-71 SCREW
9
4-234-724-21 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
supplied
#4
#3
#1
#2
#2
1
2
3
4
7
not
supplied
supplied
not
supplied
supplied
not
supplied
supplied
(including Ref.No. 10)
8
9
11
12
6
10
SP2
5
5
#4
not
supplied
supplied
8
SP1
Display
