Sony NW-A25 / NW-A25HN / NW-A26HN / NW-A27HN Service Manual ▷ View online
NW-A25/A25HN/A26HN/A27HN
21
2-13. MAIN BOARD BLOCK
6 MAIN board block
– Rear view –
1
screw
(M1.4
u 2.5)
2 claw
5 Peel off the adhesive
sheet
(HP).
5PIN HP
assy
assy
5PIN HP assy
+RZWRLQVWDOOWKHVXSSRUW+3EORFN
rib
support HP block
–/HIWYLHZ–
–5LJKWYLHZ–
bottom
top
support HP block
rib
claw
bottom
3 boss
3 boss
groove
groove
4 support HP block
Note: When installing the support HP block,
align the two grooves and two bosses.
guide line
guide line
adhesive sheet (HP)
3DVWLQJSRVLWLRQRIWKHDGKHVLYH
VKHHW+3
VKHHW+3
,QVWDOODWLRQSRVLWLRQRIWKH3,1
+3DVV\+3-
+3DVV\+3-
1 push
3 press
guide
line
line
guide
line
line
2 push
right
left
NW-A25/A25HN/A26HN/A27HN
22
2-14. 5PIN HP ASSY (HPJ1), MAIN BOARD
– MAIN board block rear view –
connector
(CN1001)
(CN1001)
straight
slant
connector
(CN1001)
(CN1001)
Note 2: Insert the HP FPC straight into the interior.
There is a possibility that using this unit without
the HP FPC correctly installed will damage it.
3
5PIN HP assy
(HPJ1)
4 sheet (WMPORT)
5 spacer reset
guide line
MAIN board
How to install the HP FPC
bottom
top
MAIN board
1 Unlock the connector.
(CN1001)
(CN1001)
2 Draw the HP FPC out
of the connector.
+RZWRLQVWDOOWKHVKHHW:03257
2.
NG
1 Unlock the CN1001.
2 Insert straight into
the
the
interior.
3 Lock the CN1001.
bottom
fold
fold
6 MAIN board
Insert straight into the interior.
Insert at a slant.
Note 1: When MAIN board is replaced, the data writing processing
etc. are necessary. For details, refer to “ABOUT WORKING
OF THE BOARD REPLACING” on page 5.
OF THE BOARD REPLACING” on page 5.
NW-A25/A25HN/A26HN/A27HN
23
SECTION 3
TEST MODE
1. SETTING THE TEST MODE
Note: Perform the test mode in the state of 3.6 V or more in the battery
voltage.
Setting method:
1. Turn the power on.
2. Press the [BACK] key for more 1.5 seconds, the home menu is
1. Turn the power on.
2. Press the [BACK] key for more 1.5 seconds, the home menu is
displayed.
3. Slide the [HOLD] switch from OFF to ON.
4. Press the key as following order.
4. Press the key as following order.
[
b
]
→ [VOL +] → [
B
]
→ [
V
]
→ [BACK] → [
B
]
→ [
u
]
→
[OPTION]
→ [VOL –] → [
v
]
5. The set reboots and the color bar is displayed on the liquid
crystal display.
6. Enter the test mode when any keys are pressed in the state of
step 5, and slide the [HOLD] switch from ON to OFF.
Note: The destination setting and sound pressure regulation setting cannot
be executed by this test mode.
2. RELEASING THE TEST MODE
1. Display the major item selection screen.
2. Press the [
1. Display the major item selection screen.
2. Press the [
v
]/[
V
] keys to select the “EXITTEST”, and press
the [
B
] key to select the “SURE ?”.
3. Press the [
u
] key, turn the power off and release the test
mode.
3. CONFIGURATION OF THE TEST MODE
[u] key
Major item
Major item switching:
[v]
[v]
/
[V] keys
[BACK] key
Minor item
Finish
or
Result
Start
Automatic
[B] key
Minor item switching:
[v]
[v]
/
[V] keys
[b] key
4. OPERATION OF THE TEST MODE
4-1. Power (POWER)
4-1. Power (POWER)
MPTAPP (X.XX.XX.XX)
Screen display
POWER
AUDIO
VIDEO
OTHER
CLESTE
DIREC
BLUETOOTH
NFC
USB HOST
SD
FM
NC
NC
SHUTDOWN
EXITTEST
VCHK
ACHK
DSVCHK
CHGCHK
SMPCHGCH
BATTCHK
RMVBATT
ACHK
DSVCHK
CHGCHK
SMPCHGCH
BATTCHK
RMVBATT
4-1-1. Power supply voltage check (VCHK)
This mode can be check the power supply voltage in the state
where all power supply lines are starting.
This mode can be check the power supply voltage in the state
where all power supply lines are starting.
Checking method:
1. Enter the test mode.
1. Enter the test mode.
(Refer to “1. SETTING THE TEST MODE”)
2. Press
the
[
v
]/[
V
] keys to select the “POWER”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “VCHK”.
4. Press the [
u
] key, all power supply lines are started.
POWER VCHK
START
Screen display
5. In this state, the power supply voltage of each power supply
line can be confi rmed by measuring the voltage.
6. Press the [BACK] key, return to minor item selection screen.
4-1-2. Consumption current (audio playback) check
(ACHK)
This mode can be check the consumption current (audio playback)
in the state where “1 kHz 0 dBs L-ch/R-ch VOLUME: 15” audio
signal is outputted.
in the state where “1 kHz 0 dBs L-ch/R-ch VOLUME: 15” audio
signal is outputted.
Checking method:
1. Enter the test mode.
1. Enter the test mode.
(Refer to “1. SETTING THE TEST MODE”)
2. Press
the
[
v
]/[
V
] keys to select the “POWER”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “ACHK”.
4. Press
the
[
u
] key, “1 kHz 0 dBs L-ch/R-ch VOLUME: 15”
audio signal is outputted.
POWER ACHK
1kHz 0dBs L/Rch
HPOUT [ VOL: 15 ]
START
Screen display
5. In this state, each time the [
b
] key is pressed, output will switch
in order of “HPOUT”
→ “LINEOUT” → “SPEAKER”.
6. In this state, each time the [
B
] key is pressed, LCD back light
on/off switch is performed.
7. Press the [BACK] key, return to minor item selection screen.
Note 1: Information on the test mode must correspond in enough
security. When the leakage has been revealed by any
chance, the source of information is specifi ed.
chance, the source of information is specifi ed.
Note 2: Execute “EXITTEST” when you release the test mode.
NW-A25/A25HN/A26HN/A27HN
24
4-1-3. Standby current check (DSVCHK)
This mode can be check the standby current.
This mode can be check the standby current.
Checking method:
1. Enter the test mode.
1. Enter the test mode.
(Refer to “1. SETTING THE TEST MODE” on page 23)
2. Press the [
v
]/[
V
] keys to select the “POWER”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “DSVCHK”.
4. Press the [
u
] key, enter the state of the deep sleep.
5. Press the [BACK] key, release the state of the deep sleep.
POWER DSVCHK
OK
Screen display
6. Press the [BACK] key, return to minor item selection screen.
4-1-4. Charge current check (CHGCHK)
This mode can be check the charge current.
This mode can be check the charge current.
Checking method:
1. Enter the test mode.
1. Enter the test mode.
(Refer to “1. SETTING THE TEST MODE” on page 23)
2. Press the [
v
]/[
V
] keys to select the “POWER”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “CHGCHK”.
4. Press the [
u
] key, the charge setting is displayed.
POWER CHGCHK
AC
AC
Screen display
5. In this state, each time the [
B
] key is pressed, the charge state
will change in order of “AC”
“USB500”“USB100”, and
will refl ect the settings that were changed by pressing the [
u
]
key.
AC
: The charging voltage check from WM-PORT pin 20
(DC IN).
USB500 : The charging voltage check from WM-PORT pin 11
(VBUS). 500 mA or less of charging current.
USB100 : The charging voltage check from WM-PORT pin 11
(VBUS). 100 mA or less of charging current.
6. Press the [BACK] key, return to minor item selection screen.
4-1-5. Smart phone charge/discharge function check
(SMPCHGCH)
Note: Not used in this unit.
4-1-6. Battery voltage detection check (BATTCHK)
This mode can be check the battery voltage.
This mode can be check the battery voltage.
Checking method:
1. Enter the test mode.
1. Enter the test mode.
(Refer to “1. SETTING THE TEST MODE” on page 23)
2. Press the [
v
]/[
V
] keys to select the “POWER”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys key to select the “BATTCHK”.
4. Press the [
u
] key, the battery voltage is displayed.
When the battery voltage cannot be confi rmed, “ERROR” is
displayed.
displayed.
(Displayed value in the following fi gure is example)
POWER BATTCHK
4.189V
Screen display
Battery voltage
5. In this state, each time the [
u
] key is pressed, the voltage
value is updated.
6. Press the [BACK] key, return to minor item selection screen.
4-1-7. Battery separation (RMVBATT)
Note: Not used for the servicing.
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