ICD-BX112 - Sony Audio Service Manual (repair manual)

2011A04-1

© 

2011.01

Capacity (User available capacity)
2 GB (approx. 1.79 GB = 1,924,136,960 Byte)
A part of the memory capacity is used as a
management area.

Frequency range
•  SHQ: 75 Hz - 20,000 Hz
•  HQ: 75 Hz - 17,000 Hz
•  SP: 75 Hz - 15,000 Hz
•  LP: 80 Hz - 3,500 Hz

MP3 bit rate and sampling frequency for
recording mode
•  SHQ: 44.1 kHz, 192 kbps
•  HQ: 44.1 kHz, 128 kbps
•  SP: 44.1 kHz, 48 kbps
•  LP: 11.025 kHz, 8 kbps

Speaker
Approx. 28 mm (1 

1

/

8

 in.) dia.

Input/Output
•  Microphone jack (minijack, stereo)
  – input for plug in power, minimum
    input level 0.4 mV, 3 kilohms or lower
  impedance 

microphone

•  Headphone jack (minijack, stereo)
  – output for 16 ohms - 300 ohms headphones

Playback speed control (DPC)
+100% to –50%

Power output
300 mW
Power requirements
Two LR03 (size AAA) alkaline batteries
(supplied): 3.0 V DC
Two NH-AAA rechargeable batteries 
(not supplied): 2.4 V DC

Operating temperature
5˚C - 35˚C (41˚F - 95˚F)

Dimensions (w/h/d) (not incl. projecting
parts and controls) (JEITA)*

37.5 mm 

× 114 mm × 20.9 mm 

(1 

1

/

2

 in. 

× 4 

1

/

2

 in. 

× 27/32 in.)

Mass (JEITA)*

Approx. 73.0 g (2 

3

/

5

 oz) including LR03 (size

AAA) alkaline batteries

*

1

  Measured value by the standard of JEITA

 

(Japan Electronics and Information

 

Technology Industries Association)

Supplied accessories
IC Recorder (1)
LR03 (size AAA) alkaline batteries (2)
Stereo headphones*

2

 (1)

Carrying pouch*

2

 (1)

Operating Instructions

*

2

  The stereo headphones, carrying pouch

 

and stereo microphone with shirt-clip are

 

supplied with some models in some regions

 only.

Maximum recording time*

*

The maximum recording time of all the
folders is as follows.

22 hr.
15 min.

33 hr.
20 min.

89 hr.

534 hr.
25 min.

(hr. : hours/min. : minutes)

*

3

  When you are going to record continuously

 

for a long time, you may have to replace

 

the batteries with new ones in the midst of

 recording.
*

4

  The maximum recording time varies if you

 

record messages in mixed recording mode.

– Continued on next page –

Battery life*

When using Sony LR03 (SG) (size AAA)
alkaline batteries (with continuous use)

*

Recording

Approx.
34 hr.

Approx.
34 hr.

Playback

*

7

 through

speaker

Approx.
12 hr.

Approx.
12 hr.

Playback using the
headphones

Approx.
36 hr.

Approx.
36 hr.

(hr. : hours)

*

Recording

Approx.
39 hr.

Approx.
55 hr.

Playback

*

7

 through

speaker

Approx.
12 hr.

Approx.
12 hr.

Playback using the
headphones

Approx.
36 hr.

Approx.
36 hr.

(hr. : hours)

When using Sony NH-AAA rechargeable
batteries (with continuous use)

*

Recording

Approx.
22 hr.

Approx.
22 hr.

Playback

*

7

 through

speaker

Approx.
10 hr.

Approx.
10 hr.

Playback using the
headphones

Approx.
25 hr.

Approx.
25 hr.

(hr. : hours)

*

Recording

Approx.
27 hr.

Approx.
37 hr.

Playback

*

7

 through

speaker

Approx.
10 hr.

Approx.
10 hr.

Playback using the
headphones

Approx.
25 hr.

Approx.
25 hr.

(hr. : hours)

*

5

  The battery life is measured in testing using

 

methods proprietary to Sony, and with the

 

initial settings for the IC recorder. However,

 

“LED” is set to “OFF.” The battery life may

 

shorten depending on how you operate the

 

IC recorder.

*

6

  For details about the recording mode, see

 

“Menu settings.”

*

7

  When playing back music through the

 

internal speaker with the volume level set to 27

Design and specifi cations are subject to
change without notice.

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.

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.

FLEXIBLE  CIRCUIT  BOARD  REPAIRING
• 

Keep the temperature of soldering iron around 270 °C during 
repairing.

• 

Do not touch the soldering iron on the same conductor of the 
circuit board (within 3 times).

• 

Be careful not to apply force on the conductor when soldering 
or unsoldering.

MPEG Layer-3 audio coding technology and
patents licensed from Fraunhofer IIS and Thomson.

All other trademarks and registered trademarks are
trademarks or registered trademarks of their
respective holders. Furthermore, “™ ” and “®” are
not mentioned in each case in this manual.

CAUTION
Risk of explosion if battery is replaced by an incorrect type.
Dispose of used batteries according to the instructions.

1-1.   Battery Case Lid .............................................................   4
1-2.   Case (Front) Assy, Speaker (SP1001) .............................   5
1-3.   Complete Main Board .....................................................   6
1-4.  Liquid Crystal Display Panel (LCD5501), 
 

Main Board .....................................................................   6

TEST  MODE 

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

7

3-1.  Block  Diagram ................................................................   13
3-2.  Printed Wiring Board –Main Section (1/2)– ...................   15
3-3.  Printed Wiring Board –Main Section (2/2)– ...................   16
3-4.  Schematic Diagram –Main Section (1/5)– ......................   17
3-5.  Schematic Diagram –Main Section (2/5)– ......................   18
3-6.  Schematic Diagram –Main Section (3/5)– ......................   19
3-7.  Schematic Diagram –Main Section (4/5)– ......................   20
3-8.  Schematic Diagram –Main Section (5/5)– ......................   21

4-1.  Case (Front) Section .......................................................   30
4-2.  Case (Rear) Section ........................................................   31

   ..............................   32

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

•  This set can be disassembled in the order shown below.

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

1 claw

2 claw

3 battery case lid