background image

Preface 

This document is intended to assist the service technician in the operation, 
maintenance and repair of  the Alesis device.  Together with the User Reference 
Manual, this document provides a complete description of the functionality and 
serviceability of the Device.  Any comments or suggestions you may have 
pertaining to the document are welcome and encouraged. 

READ THIS! 

In addition to any purchase price that Alesis may charge as consideration for Alesis selling or 
otherwise transferring this service manual (“Manual”) to you, if you are not a service and repair 
facility (“Service Center”) authorized by Alesis in writing to be an authorized Service Center, 
Alesis sells or transfers the Manual to you on the following terms and conditions: 

Only Service Centers authorized by Alesis in writing are authorized to perform service and repairs 
covered by an Alesis warranty (if any), and transfer of the Manual to you does not authorize you 
to be an authorized Service Center.  

Therefore, if you perform, or if the Manual is used to 

perform, any service or repairs on any Alesis product or part thereof, any and all 
warranties of Alesis as to that product and any service contract with Alesis for that 
product shall be voided and shall no longer apply for such product, even if your services 
or repairs were done in accordance with the Manual.

 

All service or repairs done by you or with reference to the Manual shall be solely 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 
repairs.

  You agree that all such work will be performed in a competent, professional and safe 

manner at all times and to indemnify and fully hold Alesis and its successors and assigns 
harmless in the event of any failure to so perform. 

Your purchase of the Manual shall be for your own ultimate use and shall not be for purposes of 
resale or other transfer. 

As the owner of the copyright to the Manual, Alesis does not give you the right to copy the 
Manual, and you agree not to copy the Manual without the written authorization of Alesis.  Alesis 
has no obligation to provide to you any correction of, or supplement to, the Manual, or any new or 
superseding version thereof. 

Alesis shall have the right to refuse to sell or otherwise transfer repair parts or materials to you in 
its sole discretion.  You shall not use, sell or otherwise transfer spare or replacement parts 
supplied by Alesis to you (i) to repair or be used in products manufactured for or by third parties 
or (ii) to any third parties for any purpose. 

You shall not make any warranties or guarantees with respect to the products of Alesis or the use 
thereof on behalf of Alesis or in your own name. 

The foregoing describes the entire understanding related to sale or transfer of the Manual to you, 
and no other terms shall apply unless in a writing signed by an authorized representative of 
Alesis. 

All Trademarks are property of their respective companies. 

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...

Page 21: ......

Page 22: ......

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

Page 24: ......

Page 25: ......

Page 26: ......

Page 27: ......

Page 28: ......

Page 29: ......

Page 30: ......

Page 31: ......

Page 32: ......

Page 33: ......

Page 34: ......

Page 35: ......

Page 36: ......

Page 37: ......

Page 38: ......

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...

Reviews: