Sony WALKMAN NW-WM1A, Service Manual

Page: 35 / 56

NW-WM1A/WM1Z
35
5-1-2. Consumption current (audio playback) check
(Current check)
It can be check the consumption current (audio playback) in the
state where audio signal is outputted of the “Sampling rate: 44.1
kHz/Frequency: 1 kHz (L/R-ch)/Bit rate: 16 bit”.
Procedure:
1. Enter the test mode.
(Refer to “2. SETTING THE TEST MODE” on page 33)
2. Press the [+]/[–] keys to select the “Power”, and press the [
u
]
or [
>
] key to enter the minor item.
3. Press the [+]/[–] keys to select the “Current check”.
4. Press the [
u
] key, consumption current check screen is dis-
played.
Power A check
(POW ACHK command)
1kHz 0dBs L/Rch
output: HeadPhone
volume: 90
display: 255
Screen display
Key input settings under this mode of operation:
[+]/[–] : Volume up/down
[
>
] : Backlight switching (on/off)
[
.
] : Output switching
(HeadPhone/BTL/LineOut)
[
u
] : Audio signal output (10 seconds)
5. In step 4 state, check the audio playback consumption current.
6. Slide the [HOLD] switch in the direction of on, to return to
minor item selection screen.
5-1-3. Standby current check (DeepSleep check)
It can be check the standby current.
Procedure:
1. Enter the test mode.
(Refer to “2. SETTING THE TEST MODE” on page 33)
2. Press the [+]/[–] keys to select the “Power”, and press the [
u
]
or [
>
] key to enter the minor item.
3. Press the [+]/[–] keys to select the “DeepSleep check”.
4. Press the [u] key, enter the state of the deep sleep.
(Screen display is turned off)
5. In step 4 state, check the measuring the consumption current in
standby.
6. Sleep is released by pressing any key (button) of WALKMAN
main unit.
Power DeepSleep
(POW DSVC command)
idle state
Screen display
7. Slide the [HOLD] switch in the direction of on, to return to
minor item selection screen.
5-1-4. Charge current check (Charge check)
It can be check the charge current.
Procedure:
1. Enter the test mode.
(Refer to “2. SETTING THE TEST MODE” on page 33)
2. Press the [+]/[–] keys to select the “Power”, and press the [
u
]
or [
>
] key to enter the minor item.
3. Press the [+]/[–] keys to select the “Charge check”.
4. Press the [
u
] key, charge setting screen is displayed.
Power Charge check
(POW CHGC command)
AC
>>> ---
Screen display
5. In step 4 state, each time the [
.
]/[
>
] key is pressed, the
charge state will change in order of “AC”
y
“0mA”
y
“500mA”, and will re fl ected the settings that were changed by
pressing the [
u
] key.
AC : The charging current check from WM-PORT pin 20
(DC IN).
500mA : The charging current check from WM-PORT pin 11
(VBUS). 500 mA or less of charging current.
0mA : The charging current check from WM-PORT pin 11
(VBUS). 0 mA of charging current.
6. Slide the [HOLD] switch in the direction of on, to return to
minor item selection screen.