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According to http://www.sewingmachinesplus.com/brother-sewing-machine-error-code-f7.php
the meaning and answers are as follows...
Q: What does F7 error message mean?
A: Speed VR disconnected
Q: How to fix F7 error message?
A: Unplug the sewing machine and reconnect any loose wires on the SSVR PCB assembly and the main PCB assembly. If the wiring connections are okay, replace the SSVR PCB assembly. If the problem persists, replace the main PCB assembly.
Error Codes mean different things on different machine brands. It is an error message indicating your machine is malfunctioning. Usually your owner's manual will have a list of error codes in the Troubleshooting Section that describes the problem and suggested resolution. If not, then search the internet for your machine's:
regarding E005 , E004 at JUKI lock stitch machine means :
synchronizer lower position sensor failure ( please check if socket is connect secure or lose connect - please check belt tension if lose please made more tight for belt tension.
synchronizer upper position sensor failure ( please check if socket is connect secure or lose connect - please check belt tension if lose please made more tight for belt tension.
if still not solve please change synchronizer with new one.
CAIRO - EGYPT