AIR-SA5R - Sony Audio Service Manual (repair manual)

2009F05-1

© 

2009.06

•  AIR-SA5R is the amplifi er and speaker section in ALT-SA34R.
  And, there is single sales, too.

•  “S-AIR” and its logo are trademarks of Sony Corpora-

tion.

•  The Bluetooth word mark and logos are owned by the 

Bluetooth SIG, Inc. and any use of such marks by Sony 
Corporation is under license. Other trademarks and trade 
names are those of their respective owners.

•  iPod is a trademark of Apple Inc., registered in the U.S. 

and other countries.

•  iPhone is a trademark of Apple Inc.
•  All other trademarks and registered trademarks are of 

their respective holders.

  In this manual, ™ and 

®

 marks are not specifi ed.

AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL 
HARMONIC DISTORTION:
With 4 ohms loads, both channels 
driven, from 100 – 10,000Hz; rated 1.5 
watts per channel minimum RMS 
power, with no more than 10% total 
harmonic distortion.

Continuous RMS power output 
(reference): 2.5 watts (4 ohms at 1 kHz, 
10% harmonic distortion)

Speaker system: Full range, bass-reflex 
type
Speaker units: 39 mm (1 

9

/

16

 in), cone 

type (1)
Nominal impedance: 4 ohms

Power requirements: 120 V AC, 60 Hz
Power consumption: 4 watts
Dimensions (w/h/d): Approx. 80 × 
166 × 62 mm (3 

1

/

4

 × 6 

5

/

8

 × 2 

1

/

2

 in)

Mass: Approx. 380 g (13.4 oz)

Supplied accessories:
Hook-and-loop fastener (1)

Design and specifications are subject 
to change without notice.

  .............................................   3

2-1.   Disassembly Flow ...........................................................   4
2-2.   Rear Cabinet Block .........................................................   4
2-3.   Power Unit ......................................................................   5
2-4. POWER 

AMP 

Board 

......................................................   5

2-5. Chassis 

Block 

..................................................................   6

2-6.  KEY Board, MICON Board............................................   6
2-7.  Speaker (3.9 cm) (SP301) ...............................................   7

TEST  MODE 

 ............................................................  

8

4-1.  Printed Wiring Board - MICON Board - ........................   10
4-2.  Schematic Diagram - MICON Board - ...........................   11
4-3.  Printed Wiring Board - IF Board - ..................................   12
4-4.  Schematic Diagram - IF Board - .....................................   13
4-5.  Printed Wiring Boards - LED, KEY Section - ................   14
4-6.  Schematic Diagram - LED, KEY Section - ....................   15
4-7.  Printed Wiring Board - POWER AMP Board - ..............   16
4-8.  Schematic Diagram - POWER AMP Board - .................   17

5-1.  Rear Cabinet Section ......................................................   20
5-2. Chassis 

Section 

...............................................................  21

5-3.  Front Cabinet Section .....................................................   22

  ..............................   23

Accessories are given in the last of the electrical parts list.

NOTES  ON  CHIP  COMPONENT  REPLACEMENT
• 

Never reuse a disconnected chip component.

• 

Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, 
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE  TEST
The AC leakage from any exposed metal part to earth ground and 
from all exposed metal parts to any exposed metal part having a 
return to chassis, must not exceed 0.5 mA (500 microamperes.). 
Leakage current can be measured by any one of three methods.
1.  A commercial leakage tester, such as the Simpson 229 or RCA 

WT-540A. Follow the manufacturers’ instructions to use these 
instruments.

2.  A battery-operated AC milliammeter. The Data Precision 245 

digital multimeter is suitable for this job.

3.  Measuring the voltage drop across a resistor by means of a 

VOM or battery-operated AC voltmeter. The “limit” indication 
is 0.75 V, so analog meters must have an accurate low-voltage 
scale. The Simpson 250 and Sanwa SH-63Trd are examples 
of a passive VOM that is suitable. Nearly all battery operated 
digital multimeters that have a 2 V AC range are suitable. (See 
Fig. A)

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

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)

Unleaded solder has the following characteristics.
•  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 °C.
Caution: The printed pattern (copper foil) may peel away if 

the heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than 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.

NOTE  OF  REPLACING  THE  IC401  ON  THE  MICON  
BOARD
IC401 on the MICON board cannot exchange with single. When 
this part is damaged, exchange the entire mounted board.

NOTE  OF  REPLACING  THE  IC302  ON  THE  POWER  
AMP  BOARD
IC302 on the POWER AMP board cannot exchange with single. 
When this part is damaged, exchange the entire mounted board.

• 

This set can be disassembled in the order shown below.

Note: Follow the disassembly procedure in the numerical order given.

2 two claws

2 two claws

1 three screws

3 Remove two solders 

4 rear cabinet block

1 two screws

1 three screws