Sony NWZ-A844 / NWZ-A845 / NWZ-A846 / NWZ-A847 Service Manual ▷ View online
NWZ-A844/A845/A846/A847
9
2-8. SHEET KEY (7KEY), FRONT PANEL ASSY
Note: This illustration sees the front panel assy block from front plate side.
5
A
1 EL indicator element flexible board is turned over.
qa front panel assy
3 While lifting this part, the slide is
done in the direction of arrow
A
.
2 Lightly pushing this part to
inside, remove the hook.
0 cushion (display)
9 front key assy
8 sheet key (7key)
7 front plate
4 three claws
three claws
6 sheet (front plate)
NWZ-A844/A845/A846/A847
10
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] key from OFF to ON.
4. Press the key as following order.
4. Press the key as following order.
[
B
]
→ [
b
]
→ [VOL +] → [
B
]
→ [
b
]
→ [VOL –] →
[OPTION]
→ [OPTION] → [BACK] → [BACK]
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.
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
[ ]
key
Major item
Major item switching:
[ ]/ [ ]
keys
[BACK]
key
Minor item
Finish
or
Result
Start
Automatic
u
[ ]
key
v
V
v
V
Minor item switching:
[ ]/ [ ]
keys
B
[ ]
key
b
4. OPERATION OF THE TEST MODE
4-1. Power (POWER)
4-1. Power (POWER)
Screen display
MPTAPP (X.XX.XX)
POWER
VCHK
AUDIO
ACHK
VIDEO
DSVCHK
VIDEO
OUT CHGCHK
OTHER
BATTCHK
CLESTE
FM
NC
SHUTDOWN
EXITTEST
FM
NC
SHUTDOWN
EXITTEST
4-1-1. Power supply voltage check (VCHK)
This mode is used in case power supply voltage in the state where
all power supply lines are starting is checked.
This mode is used in case power supply voltage in the state where
all power supply lines are starting is checked.
Checking method:
1. Enter the test mode.
2. Press the [
1. Enter 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.
Screen display
POWER VCHK
START
In this state, the power supply voltage of each power supply
line can be confi rmed by measuring the voltage.
line can be confi rmed by measuring the voltage.
5. Press the [BACK] key, return to minor item selection screen.
4-1-2. Consumption current (audio playback) check
(ACHK)
This mode is used in case consumption current (audio playback)
is checked in the state where “1 kHz 0 dBs L-ch/R-ch VOLUME:
15” audio signal is outputted.
is checked 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.
2. Press the [
1. Enter 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.
Screen display
POWER ACHK
1kHz 0dBs L/Rch
HPOUT [ VOL: 15 ]
START
5. In this state, each time the [
B
] key is pressed, LCD back light
on/off switch is performed.
6. 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.
NWZ-A844/A845/A846/A847
11
4-1-3. Standby current check (DSVCHK)
This mode is used in case standby current is checked.
This mode is used in case standby current is checked.
Checking method:
1. Enter the test mode.
2. Press
1. Enter 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 “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.
Screen display
POWER DSVCHK
OK
6. Press the [BACK] key, return to minor item selection screen.
4-1-4. Charge current check (CHGCHK)
This mode is used in case charge current is checked.
This mode is used in case charge current is checked.
Checking method:
1. Enter the test mode.
2. Press
1. Enter 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 “CHGCHK”.
4. Press the [
u
] key, the charge setting is displayed.
Screen display
POWER CHGCHK
AC
AC
5. In this state, each time the [
B
] key is pressed, the port setting
for the charge is changed as shown in the table below.
Port control
Display
CHG_XCHGEN
CHG_PEN1
CHG_PEN2
AC
L
H
H
USB500
L
H
H
USB100
L
H
L
6. Press the [BACK] key, return to minor item selection screen.
4-1-5. Battery voltage detection check (BATTCHK)
This mode is used in case battery voltage is checked.
This mode is used in case battery voltage is checked.
Checking method:
1. Enter the test mode.
2. Press
1. Enter 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 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.
Screen display
POWER BATTCHK
X.XXXV
X.XXXV: Battery voltage
5. Press the [BACK] key, return to minor item selection screen.
4-2. Audio (AUDIO)
While playing the audio track, it’s in a repeat state. If [BACK] key
is pressed, it’s stopped.
Press the [
While playing the audio track, it’s in a repeat state. If [BACK] key
is pressed, it’s stopped.
Press the [
b
] key to switch the HP/LINE/SPEAKER.
Screen display
MPTAPP (X.XX.XX)
POWER
AUDIO
AUDIO
OUTPUT
VIDEO
SN
VIDEO
OUT F1
OTHER
F2
CLESTE
SEPLR
FM
SEPRL
NC
MAXOUT
SHUTDOWN
NMLZR
EXITTEST SPCHK
SPKCHK
USER1
USER2
USER3
NWZ-A844/A845/A846/A847
12
4-2-1. Output check (OUTPUT)
“1 kHz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is outputted.
“1 kHz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is outputted.
Checking method:
1. Enter the test mode.
2. Press the [
1. Enter the test mode.
2. Press the [
v
]/[
V
] keys to select the “AUDIO”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “OUTPUT”.
4. Press the [
u
] key, “1 kHz 0 dBs L-ch/R-ch VOLUME: 25”
audio signal is outputted.
Screen display
AUDIO OUTPUT
1kHz 0dBs L/Rch
HPOUT [ VOL: 25 ]
START
5. Press the [BACK] key, return to minor item selection screen.
4-2-2. S/N check (SN)
“Infi nity Zero VOLUME: 30” audio signal is outputted.
“Infi nity Zero VOLUME: 30” audio signal is outputted.
Checking method:
1. Enter the test mode.
2. Press the [
1. Enter the test mode.
2. Press the [
v
]/[
V
] keys to select the “AUDIO”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “SN”.
4. Press the [
u
] key, “Infi nity Zero VOLUME: 30” audio signal
is outputted.
Screen display
AUDIO SN
Infi nity Zero
HPOUT [ VOL: 30 ]
START
5. Press the [BACK] key, return to minor item selection screen.
4-2-3. Frequency characteristic 1 check (F1)
“20 Hz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is outputted.
“20 Hz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is outputted.
Checking method:
1. Enter the test mode.
2. Press
1. Enter the test mode.
2. Press
the
[
v
]/[
V
] keys to select the “AUDIO”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “F1”.
4. Press
the
[
u
] key, “20 Hz 0 dBs L-ch/R-ch VOLUME: 25”
audio signal is outputted.
Screen display
AUDIO F1
20Hz 0dBs L/Rch
HPOUT [ VOL: 25 ]
START
5. Press the [BACK] key, return to minor item selection screen.
4-2-4. Frequency characteristic 2 check (F2)
“20 kHz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is output-
ted.
“20 kHz 0 dBs L-ch/R-ch VOLUME: 25” audio signal is output-
ted.
Checking method:
1. Enter the test mode.
2. Press
1. Enter the test mode.
2. Press
the
[
v
]/[
V
] keys to select the “AUDIO”, and press the
[
B
] key to enter the minor item.
3. Press the [
v
]/[
V
] keys to select the “F2”.
4. Press
the
[
u
] key, “20 kHz 0 dBs L-ch/R-ch VOLUME: 25”
audio signal is outputted.
Screen display
AUDIO F2
20kHz 0dBs L/Rch
HPOUT [ VOL: 25 ]
START
5. Press the [BACK] key, return to minor item selection screen.
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