Aaeon EMB-Q77A Owner's Manual page 35

11. Speaker connector (4-pin SPEAKER)
The 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
EMB-Q77A Speaker Out Connector
12. Minicard connector
Use this connector to connect a Minicard reader.
EMB-Q77A MINICARD connector
13. Internal monophonic speaker connector (2-pin INT_SPKR1)
The internal mono speaker header allows connection to an internal, low-
power speaker for basic system sound capability. The subsystem is capable
of driving a speaker load of 4 Ohms at 2 Watts (rms).
EMB-Q77A INT_SPKR connector
Chapter 2: Motherboard information
SPEAKER
PIN 1
+5V
GND
GND
Speaker Out
MINICARD
INT_SPKR1
R_OUT+
R_OUT-
PIN 1
2-27