Partner SP-850-S, Service Manual

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Jumper Setting Description
JP3
(COM3 Power Select Jumper)
1-2 Close COM3 Pin 9: 5V
3-4 Close (Default) COM3 Pin 9: RING
5-6 Close COM3 Pin 9: 12V
JP4
(COM4 Power Select Jumper)
1-2 Close COM4 Pin 9: 5V
3-4 Close (Default) COM4 Pin 9: RING
5-6 Close COM4 Pin 9: 12V
JT1
(Touch Panel USB or PS/2 Interface
Select Jumper)
1-2 Close PS/2 Interface
2-3 Close (Default) USB Interface