HELP FOR TAJIMA ERROR CODE 3A2

HI im running on a 12 head tajima machine and this error came up 3A2 it dosent wanna continue working but reverse it does go any help

I had the same problem with an Tajima TMEG.
Performing manual trimming,the main shaft does not turn,trimming solenoid does not work.
I was lucky !
I cleaned with dry contact cleaner and compress air all the joint card connectors(male and female),and now is ok,work.