MBF COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN

SERVICE GROUP(S): MICRO,MINI,LARGE     MFG: MAI BASIC FOUR

 NACS  TYPE(S): N060                   MFG. MODEL(S): TAPE DRIVES

CATEGORY: PREVENTIVE MAINT.            DESC: PM GUIDELINES

                   *** TABLE OF CONTENTS AS OF 12/20/90 ***
FIB 00001.4403 CIPHER 1/4" STREAMER...................................08/10/89
FIB 00002.4243 CIPHER 1/2" REEL TO REEL...............................08/15/89
FIB 00003.4304 CIPHER 1/2" STREAMER...................................08/17/89
FIB 00004.4269,4289 D.E.I. MTC........................................09/25/89
FIB 00005.4405 S.T.C 1600/6250 BPI GCR 1/2" STREAMER .................10/17/89
FIB 00006.4406 TANBERG 1/4" CARTRIDGE STREAMER........................10/25/89


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------Table Of Contents Pg01 of 01
FIB 00001                                                             08/10/89

                       *** 4403 CIPHER 1/4" STREAMER ***

                          FREQUENCY: EVERY TWO MONTHS

 Preventive maintenance consists primarily of cleaning the entire unit of
 dust and dirt and cleaning the magnitic read/write head.

         ITEM:                           RECOMMENDED ACTION:
|----------------------|       |------------------------------------------|  
       COVERS                    Clean

       HEAD                      Clean with a lint free swab and Freon TF.
                                 Only use freon TF to clean head the head
                                 assembly.


ORIGINATOR: John Rogers


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------FIB001 Pg001


FIB 00002                                                             08/15/89

                     *** 4243 CIPHER 1/2" REEL TO REEL ***

                         FREQUENCY: EVERY TWO MOUNTHS

        ITEM:                     ,          RECOMMENDED ACTION
|----------------------|          |---------------------------------------|

   TAPE PATH                        Visually check and clean if required.

   CAPSTAN                          Clean

   HEAD AND GUIDES                  Clean

   TAPE CLEANER                     Clean

   VACUUM COLUMNS                   Clean

   HOUSING                          The dust cover and control panel cleaned
                                    as necessary.
   BASE                             Vacuum

   COVERS                           Clean as necessary

ORIGINATOR: JOHN ROGERS


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------FIB002 Pg001


FIB 00003                                                             08/17/89

                       *** 4304 CIPHER 1/2" STREAMER ***

                  FREQUENCY: EVERY TWO MONTHS

         ITEM:                           RECOMMENDED ACTION:
|----------------------|         |---------------------------------|

  Head, Guides, Roller               Clean
  Guides, Tape Path,and
  Tachometer                                                                 

  Tape Cleaner                       Clean

  Reel-Hub Pads                      Clean

  Head Wear                          Check

  Filter                             Clean after 1000 hrs use.

  Reel Motors                        Replace after 10,000 hrs use.

  Covers                             Clean

  Base                               Vacuum

ORIGINATOR: JOHN ROGERS


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------FIB003 Pg001


FIB 00004                                                             09/25/89

                          *** 4269,4289 D.E.I. MTC ***

                FREQUENCE: EVERY TWO MONTHS

       ITEM:                             RECOMMENDED ACTION
|----------------------|        |----------------------------------------|   

   COVERS                           CLEAN AS NEEDED

   HEAD                             ALTHOUGH CLEANING THE HEAD IS A USER
                                    RESPONSIBILITY AND DONE BEFORE EACH
                                    BACKUP, IT'S A GOOD PRACTICE TO CLEAN
                                    IT ALONG WITH THE REGULAR SYSTEM P.M.


ORIGINATOR: JOHN ROGERS


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------FIB004 Pg001


FIB 00005                                                             10/17/89

              *** 4405 S.T.C 1600/6250 BPI GCR 1/2" STREAMER  ***

         ITEM                           RECOMMENDED ACTION
|---------------------|      |---------------------------------------|       

     Covers                        Clean as necessary

     Base                          Vacume

     Head                          Clean

     Tape path                     Clean as necessary


ORIGINATOR: John Rogers


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------FIB005 Pg001


FIB 00006                                                             10/25/89

                  *** 4406 TANBERG 1/4" CARTRIDGE STREAMER ***


       ITEM:                                RECOMMENDED ACTION:
|----------------------|          |---------------------------------------|

    COVERS                              CLEAN AS NECESSARY

    HEAD                              * CLEAN


   * NOTE: Although the head should be cleaned daily by the operator
           it should also be cleaned during the scheduled system PM.

ORIGINATOR: JOHN ROGERS


PREVENTIVE MAINT.-MAI BASIC FOUR-TAPE DRIVES--------FIB006 Pg001