MAI COMPANY CONFIDENTIAL FIELD INFORMATION BULLETIN
SERVICE GROUP(S): MINI                 MFG: BASIC FOUR

 NACS  TYPE(S): 4310                   MFG. MODEL(S): 4310,EAGLE

CATEGORY: VIDEO TERMINAL               DESC: EAGLE 14" MONOCHROME

                   *** TABLE OF CONTENTS AS OF 01/28/92 ***                     

FIB 00001.General Information.........................................02/19/88
FIB 00002.Monitor parts identification information and part numbers...06/17/85
FIB 00003.Hardware flow control, slave printing with one-to-one cable.08/14/85
FIB 00004.Field replacement of communication ICs......................08/30/85
FIB 00005.A/C power cord loosening....................................10/22/85
FIB 00006.Graphics Board Option information...........................02/19/88
FIB 00007.Field Repair of VDT Power Supply (MM780130 & MM783010)......10/31/90
FIB 00008.Keyboard Cleaning and Repair................................01/10/92


VIDEO TERMINAL-BASIC FOUR-4310,EAGLE----------------Table Of Contents Pg01 of 01


FIB 00001                                                             02/19/88


                          *** General Information ***                        

 The features of this machine are basically identical to those of the 4309
terminal, with the exception that this terminal has a 14" Monochrome CRT.  The
4310 supports either a BFIS Slave Printer OR a Monochrome Graphics Option (but
not both).  The 4310 is not compatible to a Slave Printer attached via the MAI
Basic Four Protocol Converter.                                               

               ***  NACS  MACHINE TYPES AND FEATURE NUMBERS ***

                                   4312,9312

                        *** AVAILABLE DOCUMENTATION ***

       Model 4310 Ergonomic Display Terminal Service Manual - S-HDBK-B53

                           *** AVAILABLE TRAINING ***

               Both Education Centers in 2000/3000 System classes.

                              *** SPECIAL TOOLS ***

                                      None

                   *** SPECIAL ADMINISTRATIVE PROCEDURES ***

                                      None

ORIGINATOR: P. BADER


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FIB 00002                                                             06/17/85

       *** Monitor parts identification information and part numbers ***

At the present time, two types of 14 inch Monitor Assemblies are being used by
Basic Four manufacturing in the 14" EDT.  The monitors are obtained from two
vendors:  C. Itoh and Dimerco.  The monitors are interchangeable only as a
complete assembly.  The individual sub-assemblies are not interchangeable.

The Monitor assembly consists of two sub-assemblies:  The Monitor board and the 
CRT/Yoke assembly.  When replacing any of the sub-assemblies, you must first
identify the type of monitor before ordering a replacement part since individual
parts from different vendors are not interchangeable.  To identify the vendor,
check the following markings:

  Description             14" C. Itoh Monitor             14" Dimerco Monitor
  CRT/ Yoke Assembly      QB1488 on CRT                   CE791Z14K31VR on CRT
                          DY-1201-06 on Yoke              455007-003 on Yoke
  Monitor board           QQQ UPC538                      DMS-M12-6, D.E.C.O.

  After identifying the type of monitor, order parts using the following ICNs:

  Description             14" C. Itoh Monitor             14" Dimerco Monitor
  Monitor Assembly        MM780141                        MM780140
  CRT/Yoke Assembly       MM788180                        MM788170
  Monitor board           MM780170                        MM780160

  A copy of the Spare Parts Matrix for the EDT is attached.

ORIGINATOR: J. VAN OORDT


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FIB 00003                                                             08/14/85

      *** Hardware flow control, slave printing with one-to-one cable ***

ECNs are being implemented to allow use of a one-to-one cable when slave
printing with hardware flow control.  This change is normally done in the Repair
Center, and should only be done to field machines on an as-needed basis.

The change consists of adding "DATA SET READY", Pin 6 (Printer port conn.) in
parallel with "DATA CARRIER DETECT", Pin 8 on the respective Logic Board.

903462-XXX     4312 EDT        Jumper J4-6 to J4-8.                          
LOGIC PCBA                     Indicate change on applicable drawings,
MM780150                       labeling J4-6 'BDSR+'.
903373-XXX     4309 EVDT       Jumper J6-6 to J6-8.
LOGIC PCBA                     Indicate change on applicable drawings,
MM780010                       labeling J6-6 'PDSR'.

ORIGINATOR: J. VAN OORDT


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FIB 00004                                                             08/30/85

                 *** Field replacement of communication ICs ***              

Problem:  All controller boards with 1488 and 1489 Chips frequently fails during
         an electrical storm.

Solution:  These boards can be repaired in the field by replacing the Chips that
           are on the IC sockets.  Order the Chips and keep them in your tool
           bags and replace them when one of the channels are not functioning.

The IC Chip inventory control numbers are as follows:                        

        1.  OR999398    IC,   1488L
        2.  YY003599    IC,   1489                                           

The following are the boards that have the 1488/1489 on IC sockets:

        1.  MM081018   901706      PCBA, 1 Channel Controller Board     13XX
        2.  MM081019   901708      PCBA, 4 Channel Controller Board     13XX
        3.  MM081020   901420      PCBA, 8 Channel Controller Board     13XX
        4.  MM361000   903271-001  PCBA, Tritel Logic Board
        5.  MM362070   903300-003  PCBA, Whisper Logic Board
        6.  MM531011   903441-002  PCBA, CMB                            2000
        7.  MM531040   903390-001  PCBA, 4-Way Controller               2000
        8.  MM720010   901810      PCBA, 7230 Logic Board               7230
        9.  MM730010   901990-001  PCBA, 7250 Logic Board               7250
       10.  MM741020   903260-001  PCBA, 7270 Logic Board               7270
       11.  MM780010   903373-001  PCBA, EVDT Logic Board               EVDT
       12.  MM780150   903462-001  PCBA, EDT Logic Board                EDT
       13.  MM821020   903242-001  PCBA, 8 Channel Controller Board     13XX
       14.  MM831061   903149-002  PCBA, 1345 Accessory Board           13XX 
       15.  MM871010   903179-003  PCBA, CPM/VDM Board                  MDT

ORIGINATOR: E. Unten


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FIB 00005                                                             10/22/85

                        *** A/C power cord loosening ***

A long time problem on CRT devices, especially the units which have chassis that
swivel or tilt, has been that of the power cord coming loose from the plug-in
receptacle. Unless the customer is alert, this usually results in an unnecessary
service call.

An ECN has been announced with a simple preventive tie down, using a cable tie
and a stick-back mounting pad.

This will be implemented in the field only, on an "as-needed" basis, and will
not be billed.

Use YY006269, Cable Tie Mount, and YY005185, Cable Tie.  Stick the mount to a
convenient place on the chassis where the cord may be secured about 2-3" from
where it plugs into the machine.  Cleaning the surface area of the chassis with 
alcohol where the mount is to be attached will aid its adhesion.  Leave just
enough slack in the cord to relieve the strain at the connection yet still allow
the machine to be unplugged without a struggle.

ORIGINATOR: C. GAHAN


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FIB 00006                                                             02/19/88

                   *** Graphics Board Option information ***

Basic Four is selling an optional Graphics board for the EDT.  This board is
called the Monochrome Graphics board, and is an add-on that mounts piggy-back on
the EDT Logic board.  When the board is installed on the EDT, and used with an
MBF 2000 System, the terminal becomes a graphics terminal able to function in
several graphics modes.   NOTE: WHEN THE GRAPHICS OPTION BOARD IS INSTALLED ON
A 4310, A SLAVE PRINTER CANNOT BE USED ON THAT TERMINAL.  NORMAL OPERATION OF
THE.GRAPHICS OPTION (EVEN WHEN NOT IN USE) WILL CAUSE INTERMITTENT SLAVE PRINTER
MALFUNCTIONS.

The Graphics Board is disabled during power-up self-tests, and remains disabled 
until enabled by a graphics command.  While disabled the Graphics board is
transparent to the EDT (except for Slave Printer operation as stated above). 

Hardware Installation:                                                       

o Prerequisites:
  o  EDT Firmware at Rev. C or higher.  To check firmware level display the
     terminal set-up menu.  The last line contains the Firmware Revision Level.
     If new proms are needed order YY016273, YY016274 and YY016275.
  o  Graphics Board Firmware at Rev. V1.4 or higher.  To check the firmware
     level examine ICs at location U8 and U9.  The label on the ICs contains the
     firmware revision level.

o After checking the prerequisites, proceed as follows:                      
  1. Remove EDT Logic board.
  2. Remove 2 jumper plugs inside Logic board connector 'J1 Graphics'.  Jumpers
     are located at the second and third positions from the top connecting pins
     2 to 18 and 3 to 19.
  3. Install the Graphics board on top of the Logic board inserting its
     connector into 'J1 Graphics'.  Secure the graphics board to the EDT board
     using the 4 screws provided.
  4. Disconnect any Slave Printer from that terminal and inform the User that
     it cannot be used while the Graphics Option is installed.

A simple test to check the operation of the graphics board on the System 2000 is
to load Basic, then type, and run the following program:

Program:                                        Comments:

10 PRINT 'CS'
20 PRINT 'ES',"ZG"                              [enable graphics board]
30 FOR L=1 TO 12                                                             
40 PRINT "GRAPHICS MODE"
50 NEXT L
60 PRINT 'ES',"Zg"                              [disable graphics board]
70 PRINT @(0,11),"NORMAL MODE"

This program should print 12 lines of characters on Graphics Alpha Mode and one 
line on normal mode.  Characters printed in graphics mode are smaller than
characters printed on non-graphics mode.

To clear the graphics characters left on the screen use a four key reset, press 
together SHIFT, CTRL, FUNCT and ESC keys.

Field Reference Information:

o  Technical information on the Graphics board is contained in Service Manual

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   BFISD 8080A or Monochrome Graphics Addendum to BFISD 8080P.
o  Graphics board P/N is MM788160  400568-001  PCBA, MONOCHROME GRAPHICS
o  EDT Firmware required by the Graphics board is Rev. C or higher. The firmware
   is contained in Proms at locations K1, M1, and N1.  Base number of the Proms
   is 165051, the dash numbers are below:

Loc.    Rev.C    Rev. D    P/N
K1      -007     -014    YY016273
M1      -008     -015    YY016274
N1      -009     -016    YY016275

SOFTWARE:

The Graphics board, at the present time, operates with OS 7.1B*09 on 2000
systems.  Basic Four sells a graphics application program for the System 2000
called GRF, Interactive Chart Designer and Business Chart Generator.  This
program generates graphics charts that may be printed on the EDT, the MVP
printer or a plotter.

ORIGINATOR: J. VAN OORDT


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FIB 00007                                                             10/31/90

         *** Field Repair of VDT Power Supply (MM780130 & MM783010) ***

SYMPTOM: The power supply is outputting no power or low power (ex. + 5 Volts at
+ 4.75 Volts).

PROBLEM DETERMINATION: The above failures may be caused by two components C8
(YY003315) and R26 (YY000877). These components may be ordered from Tustin,
using the YY______ numbers. They may also be purchased locally, by using the
following information:

   C8 (YY003315) - Capacitor, 220 UF, 25Volt, Radial Design (Cylinder shape 1/2"
   long X 5/16" diameter, with both leads coming out of the bottom end),
   Dielectric Cap. (Polarity must be observed, cap. will indicate negative (-)
   lead, also on new cap. shorter lead would be negative (-)).

   R26 (YY000877) - Resistor, 18K (Brown, gray, orange stripes would represent
   18K ohm), 1/4 watt, 5 % (Gold stripe indicating 5 % tolerence), Carbon
   Filament (Resistor body is a 1/4" long).

  NOTE: Physical size of components is important, due to placement on PCBA.

FIX: Replace C8 (Remember, polarity must be observed) and R26.

     Before replacing the components check the voltages at the supply using
     the diagram below.

NOTE: In addition to the above symptom, if the +12vdc or -12vdc is over
      13 volts then this supply is not a good candidate for this FIX.
      After replacement of the components re-check the voltages as
      indicated below.                                                       

          + 5.0vdc to + 5.3vdc                                               
          + 11.9vdc to + 13vdc
          - 11.9vdc to - 13vdc

               :------------------------------/
               |
           p14 |---  +5vdc      |
           p13 |---  ground     |  4 position pin connector
           p12 |---  +12vdc     |
           p11 |---  -12vdc     |
          :----|
          |p9  |---  +5vdc      |
          |p8  |---  ground     |  Keyed power connector on MM780130
          |p7  |---  +12vdc     |  Used in 4309,4310,4312,4313,4314
          |p6  |---  -12vdc     |
          |    |                |  Hard-wired cable on MM781030
          |p4  |---  +5vdc      |  Used in 4309
          |p3  |---  ground     |
          |p2  |---  +12vdc     |
          |p1  |---  -12vdc     |
          |----|                                                             
               |
               ~

ORIGINATOR: J.O'Brien, Mike Burch


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FIB 00008                                                             01/10/92

                      *** Keyboard Cleaning and Repair ***

Most of the keyboards sent back to Tustin for repair require only cleaning or
minor repair, procedures which can easily be accomplished in the field.

1. Cleaning and simple repair should be attempted on ALL keyboards at the field
   level. This covers both "switch-type" keyboards, as well as "membrane-type".

   Keyboards should be repaired on-site, and where this is not possible, brought

   back  to the office or stocking location and cleaned/repaired there.

   In general, the keyboards can be repaired by disassembling them, blowing-out 
   or brushing off dust and debris, cleaning the PCBA using a foaming-type
   window cleaner (like aerosol Windex), brightening contact points by rubbing
   them with an eraser (Pink Pearl), and replacing any worn-out springs or pads
   Even the newer-style membrane keyboards (such as the DT4315, PSx30, etc.)
   usually fail because of dust or liquid contamination between the membrane
   layers preventing a key from making contact. Disassembling these keyboards is

   equally easy and the membranes can be cleaned by wiping them with a soft
   cloth dampened with window cleaner.

2. Several hundred keyboard repair kits were distributed throughout the field
   in the past. Replacement parts for these kits can be ordered through
   Tustin, part numbers are as follows:

     Parts for 7270, 4309, and 4312 keyboards.
         Spring, Spacebar                          YY013799
         Spring, Print Key, Clear, Escape          YY012913
         Spring, All Others                        YY012914
         Pad  (foam/foil for each key)             YY006594
         Screws (hold PCBA to Keyboard)            YY019809

3. After cleaning the keyboard and attempting simple repair, if the keyboard is
   still not working properly, return it to Tustin using the normal return
   process.

4. MM810041 (Grey 4312 keyboard) and MM810036 (Putty 4312 keyboard) are
   alternates for each other and should be treated as such. If you need the
   opposite color, take the time to switch the keycaps and enclosure rather
   than ordering another keyboard. (Estimated time of about 10 minutes to
   switch everything).

5. Effective February 1, 1991, the field will not be able to Code A the 4309
   and 4312 keyboards from Tustin (P/N MM783020, MM810036, MM810041).


ORIGINATOR: Norm Jones


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