GS WorldView Presents an Online Exclusive


[::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::]
[:                         Apple IIE Repair Guide                           :]
[::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::]
[:                              Part 3 of 5                                 :]
[::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::]
                                Written By:
                              Double  Density

[::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::]


Part III - Display Problems
---------------------------

1) No Display - Screen all White

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) shift register latch-up               replace 74LS166 at F5 and test
     b) ROM data hung up                      replace 2732 character ROM (F4)

2) No Display - No Video

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad Cable                             Replace and test
     b) low signal                            adjust brightness
     c) Bad monitor                           test monitor
     d) Bad 74LS02 at E8                      replace and test
     e) Bad 2N3906 at A14                     replace and test
     f) Bad 2N3904 at A14                     replace and test
     g) Bad 74LS10 at C5                      replace and test
     h) Bad 74LS166 at F5                     replace and test
     i) Bad 2732 ROM at F4                    replace and test
     j) Bad 74LS374 at D3                     replace and test
     k) Bad IOU at E5                         replace and test
     l) Bad PAL 16R8 at D1                    replace and test

3) No Display - Screen Black

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Brightness bad                        Adjust
     b) Bad monitor                           test monitor
     c) Bad IOU at E5                         replace and test
     d) Bad 2732 ROM at F4                    replace and test

4) No Color

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad IOU at E5                         replace and test
     b) Capacitor C32 shorted                 replace (soldering required)
     c) Inductor L3 Bad                       replace (soldering required)

5) No Syncronization

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad IOU at E5                         replace and test
     b) Bad monitor                           replace or repair

6) Bad cursor or no cursor

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad EF ROM at E10                     replace and test
     b) Bad 2732 ROM at F4                    replace and test

7) Bad inverse or flash

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad 2732 ROM at F4                    replace and test

8) No text

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad 2732 ROM at F4                    Replace and test
     b) Bad IOU ROM at E5                     Replace and test

9) Video - Bad color

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad HAL at D1                         Replace and test

10) Bad Graphics (lo and Hi bad); text ok

     Probable Defect:                         Remedy:
     ----------------                         -------
     a) Bad IOU at E5                         Replace and test

11) Bad Graphics (HI), low and text ok

     Probable Defect:                         Remedy:
     ---------------                          -------
     a) Bad IOU at E5                         replace and test


This concludes the third part in this series.