Micro General Corp.: The Santa Ana-based manufacturer of automated shipping and mailing equipment lost $545,216 in 1990, contrasted with earnings of $19,912 for 1989. Revenue dropped 33% to $4.4 million from $6.6 million. Fourth quarter earnings totaled $28,456, contrasted with a loss of $317,066 for the corresponding year-earlier period. Revenue declined 27% to $1.1 million from $1.5 million. George D. O’Leary, president, credited the positive fourth-quarter results to reductions in operating expenses.