Acer B1-830, Service Manual

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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]
Screen lock N/A
Shutdown hole Press to turn off the system
LED Indication
N/A
Connector
USB NA
Micro USB
Micro-USB 2.0, OTG
VID: 0502
Life cycle: Min. rating of 10K connect / disconnect cycles
HDMI
N/A
Audio Jack
3.5mm Audio Jack 4ring ( with Mic)
Micro SD connector
MicroSD memory card up to 128GB (SDHC/exFAT compatible)
SD 3.0 compatible
Support hot-plug