Troubleshooting & Maintenance JBL Synthesis6-4The Mute button must be pressed within 2 seconds ofactivating the SDP-5. If the message "MUTE ON" appears onthe on-screen and front panel displays when the Mute buttonRESTORING FACTORY-DEFAULT SETTINGSWhen factory-default settings are restored, all parameters anduser-defined values are restored to their factory-default settings.Before restoring factory-default settings, it is recommended torecord all user-defined settings on the installation worksheet thatbegins on page A-14.To restore factory-default settings:1. Record all user-defined settings on the installation worksheetthat begins on page A-14. When factory-default settings arerestored, all parameters and user-defined values are restored totheir factory-default settings.2. If the SDP-5 is powered on, press the front panel standbybutton or the remote control Off button to activate standbymode and deactivate the SDP-5. If the SDP-5 is in standbymode, proceed to step 3.3. Press the front panel standby button or the remote control Onbutton to deactivate standby mode and activate the SDP-5.4. Quickly press and hold the front panel or remote control Mutebutton until the FACTORY SETTINGS menu shown belowopens on the on-screen and front panel displays.is pressed, too much time has passed. If this occurs, beginagain with step 2.5. Press the remote control Menu and arrows to highlightthe desired option. Highlight the RESTORE DEFAULTS option torestore factory-default settings. Highlight the EXIT option toclose the FACTORY SETTINGS menu without restoring factory-default settings.6. When the desired option is highlighted, press the Menu arrow to select this option.• If the RESTORE DEFAULTS option was selected, theFACTORY SETTINGS message shown below appears on theon-screen and front panel displays. When this messageappears, press a front panel or remote control button torestart the SDP-5.FACTORY SETTINGSEXITRESTORE DEFAULTSRESTORE DEFAULTSFACTORY SETTINGSHAVE BEEN RESTOREDPRESS ANY KEYTO RESTARTFACTORY SETTINGSEXITRESTORE DEFAULTSRESTORE DEFAULTS• If the EXIT option is selected, the FACTORY SETTINGSmenu will close and the two-line status (2-18) opens onthe on-screen and front panel displays.