3KDC-208U/248U/4051UGM/4051URM/MP148U/MP248UKDC-U3049/U349A/U349G/U349R/U349S/U40491. PanelACCENTSEARCHRETURN VOL2. How to enter each Test ModeTest Mode name OperationProduction Test Mode Press and hold [1] key and [3] key and reset.Service Test Mode In the STANDBY source, while pressing and holding [2] key, press [6] key for 7 seconds.(Starting to press [2] key and [6] key at the same time can not be entered into the mode)DC Error Information Mode Press and hold [3] key and [6] key and reset.✳ Transition to Test Mode shall be available during DC Error detection.3. How to release each Test Mode• Reset• Momentary voltage drop• ACC OFF• POWER OFF• Panel Detach4. Production Test Mode● Default status immediately after the mode activationIt shall be same as normal RST start in other settings than the following.DetailsDifference in actionPeriod to prohibit TEL/LINE MUTE immediately after activation(normally 10 seconds) 1 secondMecha Initialize Action ProhibitedWrite-in to E2PROM when detecting a DC error ProhibitedDemo Mode ON/OFF Setting Menu ProhibitedPower supply during ACC OFF (Back Up On) MUTE terminal turns OFF after 2 secondsBEEP sound Beep with short-pressing in any functionsVarious setting valueVolume 30 (-10dB)BASS BOOST/LOUD OFFEQ NATURALFader/Balance CenterDEMO Mode Setting OFFAUX Setting ON1NAVI MUTE Setting for Japan Detecting function valid (ATT)TEST MODE