DOWNLOAD Sony NWZ-A726 / NWZ-A726B / NWZ-A728 / NWZ-A728B / NWZ-A729 Service Manual ↓ Size: 1.32 MB | Pages: 52 in PDF or view online for FREE

Model
NWZ-A726 NWZ-A726B NWZ-A728 NWZ-A728B NWZ-A729
Pages
52
Size
1.32 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
nwz-a726-nwz-a726b-nwz-a728-nwz-a728b-nwz-a729.pdf
Date
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Sony NWZ-A726 / NWZ-A726B / NWZ-A728 / NWZ-A728B / NWZ-A729 Service Manual ▷ View online

13
NWZ-A726/A726B/A728/A728B/A729
4-2-9.  Sound pressure regulation level check
“1 kHz 0 dBs L-ch/R-ch VOLUME: 30” audio signal is output-
ted.
Checking method:
1.  Enter the test mode.
2. Press 
the 
[
v
]/[
V
] key to select the “AUDIO”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “SPCHK”.
4.  Press the [
u
] key, “1 kHz 0 dBs L-ch/R-ch VOLUME: 30”  
audio signal is outputted.
   
liquid crystal display
AUDIO SPCHK
1kHz 0dBs L/Rch
HPOUT [ VOL: 30 ]
START
5.  Press the [BACK] key, return to minor item selection screen.
4-3. Video
   
liquid crystal display
MPTAPP MENU
 POWER
 AUDIO
 
VIDEO — LCD
 OTHER
 CLESTE
 DAC
 SHUTDOWN
 EXITTEST
4-3-1.  LCD display check
Liquid crystal display is checked.
Checking method:
1.  Enter the test mode.
2. Press 
the 
[
v
]/[
V
] key to select the “VIDEO”, and press the [
B
] 
key to select the “LCD”.
3. Press 
the 
[
u
] key, all black is displayed on the liquid crystal 
display.
4.  In this state, each time the [OPTION] key is pressed, the screen 
display changes in the following order.
    All black (default) 
→ All red → All green → All blue → All 
white 
→ Color bar → Maximum drawing size confi rmation 
→ diagonal gradation (red) → diagonal gradation (green) → 
diagonal gradation (blue) 
→ diagonal gradation (white)
    Maximum drawing size confi rmation:
    All blue (All sides are red) is displayed. Whether red in all 
sides is seen is confi rmed.
5.  In this state, each time the [VOL –] key is pressed, LCD back 
light brightness min/max/middle switch is performed.
6.  Press the [BACK] key, return to minor item selection screen.
4-4. Other
   
liquid crystal display
MPTAPP MENU
 POWER
 AUDIO
 VIDEO
 OTHER 
CLOCK
 CLESTE 
KEY
 DAC 
KETYNUM
 SHUTDOWN 
FORMAT
 EXITTEST DEST
  
SPSET
  
FWVER
  
NCAPCHK
4-4-1. Clock check
The movement of an internal clock is confi rmed.
Checking method:
1.  Enter the test mode.
2. Press 
the 
[
v
]/[
V
] key to select the “OTHER”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “CLOCK”.
4.  Press the [
u
] key, date and time are displayed.
   
liquid crystal display
OTHER CLOCK
XX, XX XX XXXX
##:##:##.######
START
    XX, XX XX XXXX  : Date
   ##:##:##.###### 
: Time
    “START” changes into “OK” if the movement of an internal 
clock is confi rmed. 
5.  Press the [BACK] key, return to minor item selection screen.
14
NWZ-A726/A726B/A728/A728B/A729
4-4-2. Key check
The operation of the key is confi rmed.
Checking method:
1.  Enter the test mode.
2.  Press the [
v
]/[
V
] key to select the “OTHER”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “KEY”.
4.  Press the [
u
] key, all keys are displayed.
   
liquid crystal display
OTHER KEY
                        UP             VOL+
REW        PLAY    FF    VOL–
                DOWN         OPTION
HOLD                       BACK
START
5.  The character corresponding to the key is selected every time 
the key is pressed. “START” changes into “OK” if all keys are 
pressed.  
6.  Slide the [HOLD] key from ON to OFF, return to minor item 
selection screen.
4-4-3.  Frequency check that presses key
The frequency to which the key is pressed, insert/pull out frequen-
cy of cradle and insert/pull out frequency of the headphone are 
displayed.
Note:  Not used for the servicing.
4-4-4. Format
The user’s area is formatted, and ICV for the video and ICV for 
audio are initialized. 
Note:  Not used for the servicing.
 
Format the set from “Settings” 
→ “Common settings” → “For-
mat” when it home menu in usually operates when the set should 
format it. 
4-4-5. Destination setting
The destination setting, language information, and sound pressure 
regulation information are written in the NAND fl ash memory.
Note:  Not used for the servicing.
4-4-6.  Sound pressure regulation setting
ON/OFF of sound pressure regulation is confi rmed.
Note:  Not used for the servicing.
4-4-7. Firmware version check
The fi rmware version is displayed.
Checking method:
1.  Enter the test mode.
2. Press 
the 
[
v
]/[
V
] key to select the “OTHER” and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “FWVER”.
4.  Press the [
u
] key, the fi rmware version is displayed.
   
liquid crystal display
OTHER FWVER
X.XX.XX
MODEL NAME
NWZ-####
SERIAL NO
@@@@@@@
    X.XX.XX 
: Firmware version
    #### 
: Model name
    @@@@@@@  : Serial No.
5.  Press the [BACK] key, return to minor item selection screen.
15
NWZ-A726/A726B/A728/A728B/A729
4-4-8. NAND capacity check
Capacity of NAND fl ash memory, present bud block, maximum 
bud block, and vender ID are displayed. 
Checking method:
1.  Enter the test mode.
2.  Press the [
v
]/[
V
] key to select the “OTHER”, and press the [
B
] 
key to enter the minor item.
3.  Press the [
v
]/[
V
] key to select the “NCAPCHK”.
4.  Press the [
u
] key, capacity of NAND fl ash memory, present 
bud block, maximum bud block, and vender ID are displayed.
   
liquid crystal display
OTHER NCAPCHK
XGB
BAD BLOCK
CUR (####)/MAX (@@@@)
VENDOR ($$$$)
    X 
:  Capacity of NAND fl ash memory
     
  4/8/16 (4 GB/8 GB/16 GB)
    @@@@  :  Number of present bud block
     
  (It makes an error the acquisition of the number of 
bud blocks at “–1”)
    #### 
:  Number of maximum bud block
     
  (It makes an error the acquisition of the vender ID 
at “–1”)
    $$$$ 
: Vender ID of NAND fl ash memory
    
 0x98/0xec (TOSHIBA/SAMSUNG)
     
  (It makes an error the acquisition of the vender ID 
at “–1”)
5.  Press the [BACK] key, return to minor item selection screen.
4-5. CLESTE
   
liquid crystal display
MPTAPP MENU
 POWER
 AUDIO
 VIDEO
 OTHER
 CLESTE 
WCABLE
 DAC 
WOCABLE
 SHUTDOWN
 EXITTEST
 
4-5-1.  Clear stereo setting (With cable)
This mode is according to an original sound playback, for adjust-
ment to right and left sound.
Note:  Not used for the servicing.
4-5-2.  Clear stereo setting (No cable)
This mode is according to an original sound playback, for adjust-
ment to right and left sound.
Note:  Not used for the servicing.
4-6. DAC
   
liquid crystal display
MPTAPP MENU
 POWER
 AUDIO
 VIDEO
 OTHER
 CLESTE
 DAC 
B-GAIN
 SHUTDOWN 
T-GAIN
 EXITTEST
 
4-6-1. BASS-Gain/Fc setting
This mode is adjustment for the sound of BASS when playback.
Note:  Not used for the servicing.
4-6-2. TREBLE-Gain/Fc setting
This mode is adjustment for the sound of TREBLE when play-
back.
Note:  Not used for the servicing.
4-7. Shutdown
Function that power supply of set can be turned off without ending 
static test mode.
Procedure:
1.  Enter the test mode.
2.  Press the [
v
]/[
V
] key to select the “SHUTDOWN”, and press 
the [
B
] key to select the “SURE ?”.
3.  Press the [
u
] key, turn the power off while having entered the 
test mode.
16
NWZ-A726/A726B/A728/A728B/A729
MEMO
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