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ER-A490 (serv.man4). ERA490 Option Service Manual - Sharp ECR Service Manual (repair manual). Page 32

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6. CI signal setting
On the ER-A5RS’s RS-232 connector 2 (RSCN2), the select jumper
switch of CI signal/+5V is added.
Applicable version: N7292BH-58
Production month: From 1995/November production
JP1 position
Function: RSCN2 9-pin output
CI side
(Factory setting)
RS-232 CI signal output
Device connection requiring CI signal 
+5V side
+5V voltage output
Device connection requiring +5V voltage.
RSCN1
RSCN2
JP1
3 – 8
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