Asus A55-C Specifications Page 36

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Chapter 1: Product introduction
1.8.2 Internal connectors
11. USB 2.0 ports 3 and 4. These two 9-pin Universal Serial Bus (USB) ports are for USB
2.0/1.1 devices.
12. Optical S/PDIF Out port. This port connects an external audio output device via an
optical S/PDIF cable.
13. USB 2.0 ports 5 and 6.
These two 4-pin Universal Serial Bus (USB) ports are for USB
2.0/1.1 devices.
14. PS/2 Keyboard port (purple).
This port is for a PS/2 keyboard.
1. Power, CPU and chassis fan connectors (3-pin PWR FAN, 4-pin CPU_FAN, and
4-pin CHA_FAN1/2)
Connect the fan cables to the fan connectors on the motherboard, ensuring that the
black wire of each cable matches the ground pin of the connector.
The CPU_FAN connector supports a CPU fan of maximum 2A (24 W) fan power.
Only the CPU_FAN and CHA_FAN1/2 connectors support the ASUS Fan Xpert
feature.
If you install two VGA cards, we recommend that you plug the rear chassis fan cable
to the motherboard connector labeled CHA_FAN1/2 for better thermal environment.
DO NOT forget to connect the fan cables to the fan connectors. Insufcient air ow inside
the system may damage the motherboard components. These are not jumpers! DO NOT
place jumper caps on the fan connectors.
F1A55 R2.0
F1A55 R2.0 Fan connectors
CPU_FAN
CHA_FAN1
CPU FAN PWM
CPU FAN IN
CPU FAN PWR
GND
CHA_FAN2
CHA FAN DC Mode
CHA FAN IN
CHA FAN PWR
GND
GND
CHA FAN PWR
CHA FAN IN
CHA FAN DC Mode
GND
+12V
Rotation
PWR_FAN
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