ENGINEERING CHANGE NOTICE

ECN Number:_____________8____________________

Product:________DJ/DMA__FLOPPY CONTROLLER____

Part Number(s):____500-DJDMA_________________

Current Board Revision Number:_____3B________

New Board Revision Number:_________3C________


Purposå  oæ Change:_Change feedback and bias_resitors to the __

VCO error amplifier (1458 op amp at location 1D).  The specs for

the 1458 list an input impedance of 300K ohms_so this change____

will make the circuit conform to manufacturers specifications.__


Modifications (attach additional sheets if needed):  _Replace__

two 1M ohm, 1/4 watt resistors_at location 1D with two 10K ohm_

1/4 watt resistors.  Boldly mark board with as Rev 3C._________


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.
                                                      ILKSCREEN

Form ECN Rev-2 9/83

Š                    ENGINEERING CHANGE NOTICE

ECÎ Number:______8______ß                    Dateº 11/22/83_

PRODUCTº ____DJ/DMA_____ß                    Pageº _2_ of _3_




                 DELETE FROM BILL OF MATERIALS:

ITEM    DESCRIPTION                          PART #          QTY.

        1M OHM, 1/4 WATT, 5%, C.F.                            2





                SUBSTITUTE IN BILL OF MATERIALS:

ITEM    DESCRIPTION                          PART #          QTY.

        10K OHM, 1/4 WATT, 5%, C.F.                            2