OKIFAX 5700/5900 7 - 167.13 High-speed Modem TestModem's signal appearsacrossCN3 (WN5)?StartTXWhich mode, TX or RX?YesReturn to section 7.1Connect oscilloscope probeacross the line terminalsL1 and L2Perform H-MODEM SENDTEST for the transmitter andH-MODEM REC TEST forthe receiver. (See Fig. 6.9.1)NoSolved? YesReplace WN5 Board.Replace C34 or H34 BoardTX EndSignal route:CN3-15, 16→T1-3, 1→CN1-3, 4RXModem's signal appearsacross L1 and L2?Replace MCNT(R76) Board.YesAPossible cause:CML signalNoModem's signal appearsacross CN11-A25 (S)of MCNT (R76) board?Replace MCNT(R76) Board.YesNoNoSignal route:CN12-A8, B8 → CN11-A25Signal route:IC202-9→ IC203-6, 7→ IC203-2, 1→ CN201-2
