Acer B1-820, Service Manual

Page: 9 / 48

shouldn't be over -13dB.

[VoIP-handheld hands-free] Handheld hands-free sending loudness should be 15dB at 30cm and
handheld hands-free receiving loudness should be 10dB at 30cm.

Headphone application must meet EN50332.

Single Digital Microphone.

ASR assist
Camera
Camera

Front camera : 0.3MP Camera with Fix Focus (GC0310) with ZSD mode

Photo capture at 30fps @ 640x480 in JPEG

Video recording at 30 fps@ 480p VGA in 3gp format

Rear camera : 5.0MP with Auto Focus (OV5670) with ZSD mode
( 88 degree of wide angle view )

Photo capture at 30fps @ 2560x1920 in JPEG

Video recording at 30 fps@ 720p HD in 3gp format
Button
POWER

Long press > 1 second (±10%) to power on (when device is off).

Long press 1 second to show power-off dialog (when device is on even
in lock state)

Once CPU is on, system Acer logo should show up within 2 seconds.

Press to suspend the device (when device is on)

Press to resume the device (when device is in suspend mode)

Once if the system resumes, system will be back to lock screen.

If system is in lock screen, without unlock by user, the system will
suspend after 10 seconds

Long press 5 seconds (±1%) to force power-off device (when device is
on, or in power-on procedure, or in lock state)

The method to lunch boot menu:

Hold volume up and press power key for 3 second

Release power key

Release volume up
Volume UP/Down
Volume up/down: Press to increase/decrease the volume

Press upper key to volume up in landscape mode, both of 0°
orientation and 180° orientation; The other to volume down.

Press the right key to volume up in portray mode, both of 90°
orientation and 270° orientation; The other to volume down.
[the below diagrams are for reference only]