ENGINEERING CHANGE NOTICE

ECN Number:_____________7____________________

Product:_____WUNDERBUS I/O___________________

Part Number(s):____WB I/O____________________

Current Board Revision Number:_____2_________

New Board Revision Number:_________2A________


Purposå  oæ Change: _To insure proper reset of 74LS74 IC_at____

location 4C taking into account diode forward voltage drop.____


Modifications (attach additional sheets if needed):  __On bot-_

tom side of board, replace 1N914 silicon diode with a 1N270 or_ 

a 1N277 germanium diode.__Be sure to observe correct polarity._ 

Mark board with the Rev 2A designation._________________________


APPROVED:      Engineering:______________________Date__/__/__

               Production:_______________________Date__/__/__

               Quality Assurance_________________Date__/__/__

               Customer Service__________________Date__/__/__

               Purchasing________________________Date__/__/__

               Marketing_________________________Date__/__/__

EFFECTIVITY:   [ ]  Immediate - notify current production

               [ ]  Notify users and update stock

               [X]  Phase in as stock is depleted


Submitted by:_______Bob Groppo____________________on 11/22/83
 
Page_1_of_3_                                 DRAWINGS: _BOM, SCH.
                                                       SILKSCREEN


Form ECN Rev-2 9/83

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Š                    ENGINEERING CHANGE NOTICE

ECÎ Number:_____7_____ß                          Dateº _11/22/83

PRODUCTº ____WB I/O___ß                          Pageº _2_ of _3_





                 DELETE FROM BILL OF MATERIALS:

ITEM    DESCRIPTION                          PART #          QTY.

        DIODE, SIGNAL, 1N914 OR 1N4148                        1





                SUBSTITUTE IN BILL OF MATERIALS:

ITEM    DESCRIPTION                          PART #          QTY.

        DIODE, SIGNAL, 1N270 OR 1N277                         1