IBM PC 300 Maintenance Service Manual page 126

P+P P : Power LED
1
SPKR: Speaker Connector
1 +
HD: IDE Hard Disk Active LED
1
GN: Green Function Switch
GD: Green LED
1
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PIN 1: LED anode (+)
PIN 2: LED cathode ( )
PIN 3: LED cathode ( )
PIN 1: VCC (+)
PIN 2: NC
PIN 3: NC
PIN 4: Data ( )
PIN 1: LED anode (+)
PIN 2: LED cathode ( )
Open: Normal operation
Short: Entering Green Mode
PIN 1: LED anode (+)
PIN 2: LED cathode ( )