B
Check the voltages on the main control board.
Is 10 VAC being supplied to the main control board?
Yes Replace the RS232C board.
Has the problem been resolved?
Yes End of procedure.
No Replace the main control board.
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
No Replace the power supply unit.
Has the problem been resolved?
Yes End of procedure.
No Replace the RS232C board.
Are + 8 vdc / - 8 vdc present on the main control board? (Refer to Appendix A
of this Service Handbook).
Yes Replace the RS232C board.
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
No Replace the main control board.
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
Microline 520/521 Service Handbook 4 - 41 Failure Analysis
P/N 59257803
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