41309401TH Rev.4 228 /7.7 Transmission ProblemThis section explains how to localize the cause of problems occurred after completion of connectionwith a remote station.Solved?StartStep 1:Return to section 7.1Set MH ONLY (Technical functionNo. 12) to ON.Set HIGH-SPEED MODEM RATE(Technical function No. 13) to 4800 bps.Step 2:Solved? YesAdjust send signal power level.(Technical function No. 21)Step 3:Solved? YesSet ECHO PROTECTION (Technicalfunction No. 11) to ON.Step 4:Solved?YesYesNoNoNoDo they transmit normally?Test other fax machine under the sameconditions, especially concerningStep 1-4.Description: Protective tone is 1700 Hz/200 ms.This signal is added to training signal to protect the training signal against echoas follows.NoTXYesThe hardware of the troubled faxmachine may be damaged.Go to 7.13 (High-speed Modem Test)to localize the cause.Check the line and the network.Note: Even if the high-speed modem testresults in success, 300 bps signal routeremains unchecked. In that case, themost suspected unit is MCNT Board.message signalProtective tone1700 Hz/200 msTR
