Help 4D probe; acknowledge the probe via the ID code; switch the 4D push sign through the electrical relay to make the 4D probe perform Generally. four.2.2 Primary board The principle board can be divided into two parts: front-end of the primary board and back-finish of the primary board. https://felix50i10.bloguetechno.com/dp50rb-login-no-further-a-mystery-64989871