Mar. 2008 MT-90U Cautionary Notes Main Specifications Before beginning the procedure, please read through this document. The matters described may differ according to the model. MT-90U: Music Player Back Up User Data! Playback Composer Executing a Factory Reset returns the following settings to their factory defaults. These cannot be backed up. Note them down on paper as required. External Memory • Tuning settings (Owner’s Manual p. 17) • USB Memory (sold separately) • Metronome tone (Owner’s Manual p. 47) • Count sound settings (Owner’s Manual p. 48) • Floppy Disk * Read only • Lyrics-display language setting (Owner’s Manual p. 49) • Track Assign settings (Owner’s Manual p.
50) * USB 3.5 in. floppy disk drive (FD-01 series) required (sold separately) • Setting the Type and Timing of CD to be Played Back (Owner’s Manual p.51) • CD-ROM • Audio CD • USB memory settings (Owner’s Manual p. 52) • USB driver settings (Owner’s Manual p.
52) * Read only * Commercial USB CD drive required Supported Data Part Replacement • Standard MIDI Files (format 0/1) When replacing components near the power-supply circuit or a heat- generating circuit (such as a circuit provided with a heat sink or including a cement resistor), carry out the procedure according to the instructions with respect to the part number, direction, and attachment position (mounting so as to leave an air gap between the component and the circuit board, etc.).
• Roland Original Format • Audio files (WAV; 44.1 kHz, 16 bit linear format) • MP3 files (44.1 kHz, 32 to 320 kbps) • Audio CD * Commercial USB CD drive required Parts List Tracks A component whose part code is ******** cannot be supplied as a service part because one of the following reasons applies. 16 tracks • Because it is supplied as an assembled part (under a different part code). • Because a number of circuit boards are grouped together and supplied as a single circuit board (under a different part code). Control • Because supply is prohibited due to copyright restrictions.
Reset, Stop, Play, Bwd, Fwd, Repeat, Marker, Song, Tempo, [+], [-], Track Selection, Count In, Metronome (MIDI only), Center Cancel (audio only) • Because reissuance is restricted. • Because the part is made to order (at current market price). Tempo Circuit Diagram Quarter note = 10 to 500 (MIDI only) 75 to 125% (audio only) In the circuit diagram, “NIU” is an abbreviation for “Not in Use,” and “UnPop” is an abbreviation for “Unpopulated.” They both mean non-mounted components. The circuit board and circuit board diagram show silk-screened indications, but no components are mounted. Resolution 120 ticks per quarter note (MIDI only) In the Main Board Circuit Diagram (p.
24), red parts on the PDF and gray parts on paper media service notes mean non-mounted components. The circuit board and circuit diagram show silk-screened indications, but no components are mounted. Transpose -6 to +5 (semitones) Demo Songs 14 songs 2