DOTRONIX INC
SC 13D/A, 1997-08-27
COMPUTER TERMINALS
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<PAGE>
 
                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 7)*



                                Dotronix, Inc.
________________________________________________________________________________
                               (Name of Issuer)


                         Common Stock, $.05 par value
________________________________________________________________________________
                        (Title of Class of Securities)


                                  258564 10 3
        _______________________________________________________________
                                (CUSIP Number)

       William S. Sadler, 160 First Street S. E., New Brighton, MN 55112
________________________________________________________________________________
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                                 July 29, 1997
        _______________________________________________________________
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [_]. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                       (Continued on following pages(s))

                                  Page 1 of 4
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------                                  ---------------------
 CUSIP NO. 258564 10 3                                     PAGE 2 OF 4 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      William S. Sadler                    
      ###-##-####                  
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4    
      PF
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      USA
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            1,186,889
                             
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY                    
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             1,186,889
                         
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10   
                                 
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      1,186,889
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      29.4%            
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
                                 SCHEDULE 13D

This amendment No. 7 to Schedule 13D is being filed to reflect changes in
the amount and form of beneficial ownership of common stock of Dotronix, Inc.

Item 1. Security and Issuer.
- ----------------------------

This statement relates to the Common Stock, $.05 par value (the "Common
Stock"), of Dotronix, Inc. (the "Issuer"). The Issuer's principal executive
offices are located at 160 First Street S.E., New Brighton, Minnesota 55112.

Item 2. Identity and Background.
- --------------------------------

The undersigned, William S. Sadler, is the Chief Executive Officer of the
Issuer and his business address is set forth above. He is a United States
citizen.

The undersigned, during the last five years, has not been convicted in a
criminal proceeding (excluding traffic violations or other similar
misdemeanors) and has not been a party to a civil proceeding of a judicial or
administrative body that resulted in judgment or final order regarding
violations of federal or state securities laws.

Item 3. Source and Amount of Funds or Other Consideration.
- ----------------------------------------------------------

The amount of funds used by the undersigned in purchasing 70,000 shares of
Common Stock on May 27, June 5, June 6, June, 11, June 12, June 16, June 27,
July 2 and July 29, 1997 was $72,188, and the source of such funds was personal
funds. None of such funds were borrowed or otherwise obtained for the purpose
of acquiring, holding, trading or voting the securities.

Item 4. Purpose of Transaction.
- -------------------------------

The purpose of the undersigned's acquisition of the shares of the Issuer is
for investment.

Item 5. Interest in Securities of the Issuer.
- ---------------------------------------------

The undersigned beneficially owns 1,186,889 shares of Common Stock
(including (a) 432,089 shares of Common Stock directly owned and previously
acquired, (b) 684,800 shares of Common Stock owned and previosly acquired
through Minnesota River Aviation, of which the undersigned is the sole
shareholder, and (c) the 70,000

                                  Page 3 of 4
<PAGE>
 
shares of Common Stock purchased as reported hereby), which constitutes
29.4% of the shares of Common Stock of the Issuer. This percentage is based
upon the denominator of 4,040,335 outstanding shares of Common Stock as of July
29, 1997. Except as otherwise noted above, the undersigned holds sole voting
power and power of disposition in connection with such shares.

Additionally, the undersigned's spouse owns 12,800 shares of Common Stock,
for which the undersigned disclaims beneficial ownership.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
- --------------------------------------------------------------------------------
Securities of the Issuer.
- -------------------------

Incorporated by reference to Amendment No. 3 to this Schedule 13D.

Item 7. Material to be filed as Exhibits.
- -----------------------------------------

None.

                                  SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true and complete.

Dated: August 25, 1997
        
                                         /s/ William S. Sadler
                                         _____________________________________
                                         William S. Sadler

                                  Page 4 of 4


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