【产品型号】：打印服务器 – WPS系列-基本型 – WPS402 B1/B2
【问题描述】：您好，我司目前使用之WPS402_B1，软件版本1.65 (181028_17:54:49_ed09e91)，其中有三个USB埠连接了TSC TTP-345标签打印机，昨日上午开始突然全部显示离线，重新启动设备、印表机或电脑都无法排除，连进WPS402管理界面后日志持续显示许多错误：
Fri Dec 18 16:40:00 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.2/idVendor’: No such file or directory
Fri Dec 18 16:40:00 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.2/idVendor’: No such file or directory
Fri Dec 18 16:40:00 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3/idVendor’: No such file or directory
Fri Dec 18 16:40:00 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3/idVendor’: No such file or directory
Fri Dec 18 16:40:00 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.4/idVendor’: No such file or directory
Fri Dec 18 16:40:00 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.4/idVendor’: No such file or directory
Fri Dec 18 16:40:06 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.1/idVendor’: No such file or directory
Fri Dec 18 16:40:06 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.1/idVendor’: No such file or directory
Fri Dec 18 16:40:06 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.2/idVendor’: No such file or directory
Fri Dec 18 16:40:06 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.2/idVendor’: No such file or directory
Fri Dec 18 16:40:06 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3/idVendor’: No such file or directory
Fri Dec 18 16:40:07 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3/idVendor’: No such file or directory
Fri Dec 18 16:40:07 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.4/idVendor’: No such file or directory
Fri Dec 18 16:40:07 2020 daemon.err uhttpd[793]: cat: can’t open ‘/sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.4/idVendor’: No such file or directory
请问该如何排除故障？