Troubleshooting 7 - 21 OKIFAX 5300/5600Service Manual, P/N 592783017.1.16 No Acoustic Line MonitorThere are two source routes of acoustic line monitor:(a) General communication signal(b) DP pulse signalStartNoMONITOR CONTROL(Technical function No. 02)has been set to OFF?Replace M17-x Board.The signal appears?Replace the speaker.Connect oscilloscope probeacross CN8-01 (SP) andCN8-02 (AG).MONITOR VOLUME(Function program No. 06)has been set toLOW or HIGH?Set MONITOR VOLUMEto LOW or HIGH.No (ON)YesYesYes (OFF)Set it to ON.A message can bereceived normally?Go to 7.1.9.(Reception problem)NoYesSignal route (R):CN6-A6, B6→IC12-1 (RM)→TR1-2→IC11-3→IC11-5No
