OKIFAX 5700/5900 7 - 207.16 No Acoustic Line MonitorThere are two source routes of acoustic line monitor:(a) General communication signal(b) DP pulse signalStartNoMONITOR CONTROL(Technical setup No. 02)has been set to OFF?Replace MCNT (R76) Board.The signal appears?Replace the speaker.Connect oscilloscope probeacross CN10-1 (SP) andCN10-2 (AG).MONITOR VOLUME(Machine settings No. 11)has been set to HIGH/HIGH-MID/MID/LOW/OFFSet MONITOR VOLUME toHIGH/HIGH-MID/MID/LOW/OFFNo (ON)YesYesYes (OFF)Set it to ON.A message can bereceived normally?Go to 7.9.(Reception problem)NoYesReplace MCNT (R76) board.NoYesSignal route:CN11-B23→TRI5-2, 1→IC21-12, 3→IC20-3, 5→CN10-1Signal route:CN12-A6, B6→CN11-A22NoReceive signal appearsacrossCN11-A22 (R) ofMCNT (R76) board?Replace C34 or H34Modem boardNoYesSignal route:CN201-8→IC204-2, 1→CN201-5Receive signal appearsacrossCN201-5 (RM) ofC34 or H34 Modem board?
