Sony SAC-5-B Service manual
SA-C5B
SERVICE MANUAL
Ver 1.2 2002. 01
• SA-C5B is the speaker system
in CMT-C5.
SPECIFICATIONS
Speaker system Two-way, bass reflex
system
Speaker units 9 cm dia., cone type
woofer
2.5 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
AEP Model
UK Model
E Model
Australian Model
Chinese Model
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.
9-873-219-03
2002A1600-1
© 2002.1
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
SPEAKER SYSTEM
SA-C5B
Ver 1.1 2001.09
[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-C5) and speaker system (SA-C5B) 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.
SERVICE NOTE
CN801 AMP board
RELAY
9
SP-GND
8
7
+B
6
POWER-GND
5
-B
4
SHIELD GND
3
2
PRE-SIGNAL
1
LED (BLUE)
Speaker
DC regulated
power supply 1
DC regulated
power supply 2
Audio signal
generator
+
-
+
COM
-
AUDIO SIGNAL
+5V
GND
+20V
-20V
GND
• 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 tw o
polarities of positive and negative polarities. However, the two units of the DC regulated pow er supply that supplies
only a single output voltage can also be used. (See the figure below.)
CN801
DC regulated
power supply
DC regulated
power supply
+
-
+
-
+20V
-20V
7
+B
6
POWER-GND
5
-B
4
3
• 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 :
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.
2
1-1. PRINTED WIRING BOARD
SECTION 1
DIAGRAMS
12
SA-C5B
• Semiconductor
Location
(AMP BOARD)
Ref. No. Location
D821 B-3
12
91
D831, D832
– BACK LIGHT FOR SP2 –
IC801 C-1
Q821 B-1
Q822 C-2
Q823 C-2
Q824 C-3
• Semiconductor
Location
(LED BOARD)
Ref. No. Location
D831 A-5
D832 A-5
1
2
4
5
IC801
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
• Indication of transistor
Q
B
CE
These are omitted.
33
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