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You should have a manual for that device. Message errors are listed, and if you can't locate that information; go on line to Brother at the Web site and seek assistance from the company support.
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Hi there Ok .
: What does F4 error message mean?
A: Foot controller disconnected
Q: How to fix F4 error message?
A: Plug in the foot controller jack if it's disconnected. If the foot controller jack appears damaged, replace it. Replace the foot controller if it's defective. Replace the main PCB assembly if the foot controller is connected and working properly.
Take care and don't miss a stitch now From Clive
Every fault code I am able to find concerning F-4 period has to do with bad oven sensor. This is the probe coming through the wall inside the oven to read oven temp and to regulate it. Hope this helps. Rick
"always message to press F4 at the time of star up". this problem happen when CMOS detect any error. is also happen if CMOS battery fail (Chack sum error).
to solve this problem at first check CMOS battery (it voltage less then 3V or not) if it bad then replace it. u can buy this battery form any computer accessories shope.
or if u not connect floppy drive, and controller enable. if u desable floppy drive contoller from CMOS setup (in intel mother board is show BIOS setup) then this problem solved.
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