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ALESIS

MMT-8 (MT)

Service Manual

P/N: 8-31-0018-A

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Summary of Contents for MMT-8

Page 1: ...ALESIS MMT 8 MT Service Manual P N 8 31 0018 A...

Page 2: ...olely your responsibility and Alesis shall have no liability for any such repairs or service work All such service or repairs are performed at the sole risk of the person performing the service or rep...

Page 3: ...DISTRIBUTOR OR AUTHORIZED REPAIR SERVICE CENTER IN THE PROVISION OF REPAIR SERVICES OR TO BE OR MAKE REPAIRS AS AN AUTHORIZED SERVICE CENTER ALL REPAIRS DONE BY ANY ENTITY OTHER THAN AN AUTHORIZED AL...

Page 4: ...adiators or other heat producing equipment 7 Ventilation When installing the product make sure that the product has adequate ventilation Improperly ventilating the product may cause overheating which...

Page 5: ...pacitors that begin to leak excess current after a significant amount of time 5 Cable Checks Wiggling cables can reveal intermittent failures such as loose cables or poorly soldered headers Remember t...

Page 6: ...00 Power Supply 1 2 10 Battery Backup 1 3 00 The 8031 Micro Controller 1 3 10 Reset 1 3 20 Memory Mapped I O 2 4 00 Tape I O 2 5 00 MIDI I O 3 6 00 Keypad Decoding 3 7 00 Metronome Output 4 8 00 Upda...

Page 7: ...although a 1 to 20mV range is more normal then a problem exists Usually it indicates a bad or simply wrong SRAM or a short somewhere along the MEM PWR line Note that for a short time Sony 58256 PM hi...

Page 8: ...e just right For example if an MMT 8 was shut off while in record mode it s possible the 8031 was put into reset in the middle of writing a two byte pointer into memory If only one of those bytes is w...

Page 9: ...reduce the chances of bad saves Note however that the MMT 8 does not compare the tape to the contents of memory It simply verifies that the information on the tape is valid MMT 8 data 7 Experimentatio...

Page 10: ...Alesis MMT 8 Service Manual 1 00 4 9 00 Troubleshooting...

Page 11: ...single part or song was loaded in or a cassette was verified 5 26 88 1 08 1 When in record on a part in loop the display will no longer remain displaying RECORDING after looping The display will still...

Page 12: ...this feature can be used to locate directly to any beat within the current step of the song 9 Fixes bug that caused a track to stop playing if the track was shifted forward in time 1 to 48 384th note...

Page 13: ...selected when playing an empty part 2 If an empty part is recorded for 683 beats either by recording through the entire part or rewinding with loop on to a beat before 683 and punching in without hav...

Page 14: ...MENTS F0H SYSTEM EXCLUSIVE STATUS BYTE 00H 00H 0EH ALESIS I D NUMBER 00H MMT 8 I D NUMBER Following the above 5 bytes will be a block of data representing the contents of the MMT 8 s memory In order t...

Page 15: ...pointer to song 00 104H MSB of absolute pointer to song 01 105H LSB of absolute pointer to song 01 106H MSB of absolute pointer to song 02 107H LSB of absolute pointer to song 02 1C8H MSB of absolute...

Page 16: ...ata 0EH LSB of offset from start of part to address of start of track 2 data 0FH MSB of offset from start of part to address of start of track 2 data 10H LSB of offset from start of part to address of...

Page 17: ...sb set to 1 while a 5 byte packet has the 1st byte msb set to 0 Each packet contains one of the following seven events Note event with duration controller 0 121 event program change event after touch...

Page 18: ...b Pitch bend msb Sysex format 01111101 Sysex flag 125 1vvvvvvv sysex byte 0 127 bccccccc b 1 EOX b 0 then c sysex byte 00000000 not used deeeeeee d 1 EOX d 0 then e sysex byte A sysex message ends and...

Page 19: ...02H Tempo of song in BPM 03H 10H 14 digit ASCII name of song 11H Step 1 part number 00 99 12H Step 1 play tracks bit 0 track 1 bit 7 track 8 0 off 1 on 13H Step 2 part number 14H Step 2 play tracks 15...

Page 20: ...Confidential Alesis Service Manual 8 31 0018 A ALESIS MMT 8 MT SCHEMATIC AND PCB FILES...

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Page 23: ...Confidential Alesis Service Manual 8 31 0018 A ALESIS MMT 8 MT ECN HISTORY...

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Page 39: ...Confidential Alesis Service Manual 8 31 0018 A ALESIS MMT 8 MT BOM...

Page 40: ...2 11 7805 1 VR1 NAT ONLY MAIN NAT IC 74HC138 DEMUX 2 14 0138 1 U5 MAIN NAT TI IC 74HC541 OCTAL BUFFER 2 14 0541 1 U3 MAIN NAT TI IC 74HC573 LATCH TRI ST 2 14 0573 1 U11 MAIN NAT TI IC 74HC574 TRI STA...

Page 41: ...MAIN RES 1 5M 1 8W 5 0 00 0155 1 R6 MAIN RES 2K 1 8W 5 0 00 0202 1 R11 MAIN RES 220 1 8W 5 0 00 0221 21 R46 60 33 38 MAIN RES 2 2K 1 8W 5 0 00 0222 4 R26 27 30 31 MAIN RES 3 3M 1 8W 5 0 00 0335 1 R15...

Page 42: ...Alesis MMT 8 Service Manual 16 13 00 Service Manual History 7 21 94 V1 00b Preliminary Release...

Page 43: ...Alesis MMT 8 Service Manual 1 00 17 INDEX...

Page 44: ...Alesis MMT 8 Service Manual 1 00 18 NOTES...

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