Hi there
1- your control box model is SC-500 not SV500, juki didn't made sv never ever
2- there is no error 2 just error 3 and error 4 both means there's problem with synchronizer which installed behaind handwheel first try to clean it by dray spray maby there's some oil or dust arround it. if error still coming change the senchronyzer with new one
best regards
ashraf abozid
[email protected]
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