Asus P4B-LS Motherboard DIY Troubleshooting Guide - Page 48
Floppy Disk Drive Connector, Chassis Alarm Lead
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3. Floppy disk drive connector (34-1 pin FLOPPY) This connector supports the provided floppy drive ribbon cable. After connecting one end to the motherboard, connect the other end to the floppy drive. (Pin 5 is removed to prevent incorrect insertion when using ribbon cables with pin 5 plug). FLOPPY PIN 1 NOTE: Orient the red markings on ® the floppy ribbon cable to PIN 1. P4B-LS P4B-LS Floppy Disk Drive Connector Figure 2-33 Floppy Disk Drive Connector 4. Chassis open alarm lead (4-1 pin CHASSIS) This lead is for a chassis designed with intrusion detection feature. This requires an external detection mechanism such as a chassis intrusion sensor or microswitch. When you remove any chassis component, the sensor triggers and sends a high-level signal to this lead to record a chassis intrusion event. If you do not wish to use the chassis intrusion lead, place a jumper cap over the pins labeled "Chassis Signal" and "Ground" to close the circuit. +5VSB_MB Chassis Signal GND ® P4B-LS CHASSIS 1 P4B-LS Chassis Alarm Lead Figure 2-34 Chassis Alarm Lead 2-26 Chapter 2: Hardware information