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Text File  |  1994-02-10  |  5.3 KB  |  150 lines  |  [TEXT/GEOL]
  1. AppleColor RGB Monitor General Troubleshooting
  2.  
  3.  
  4. This article last reviewed: 20 July 1988
  5.  
  6. USING THE SYMPTOM CHART
  7.  
  8. Find the symptom that best describes how the defective monitor
  9. appears and then try the recommended actions in the order listed.
  10. If the first corrective action does not solve the problem, put back
  11. the original module or part before trying the next action.
  12.  
  13. Symptom                        Corrective Action
  14.  
  15. Power is On,                   1. Make sure that the power cord is
  16. LED is Off                        plugged into a live power outlet.
  17.                                2. Replace the LED assembly.
  18.                                3. Replace the AC cord assembly.
  19.                                4. Replace the main logic board.
  20.                                5. Replace the CRT video board.
  21.                                6. Replace the ON/OFF Switch.
  22.                                7. Replace the CRT.
  23.  
  24.  
  25. Power is On, LED               1. Make sure that the computer
  26. is on, but raster                 connection is secure.
  27. is not displayed               2. Adjust the external BRIGHTNESS
  28.                                   control on the front panel.
  29.                                3. Adjust the Contrast Control.
  30.                                4. Check fuse F901 on the main logic
  31.                                   board.  Replace if blown.
  32.                                5. Check that all connectors are secure
  33.                                   on the main logic board and the CRT
  34.                                   video board.
  35.                                6. Replace the main logic board.
  36.                                7. Replace the CRT video board.
  37.                                8. Replace the CRT.
  38.  
  39.  
  40. One horizontal                 1. Check to make sure that the internal
  41. line appears                      service switch (S691) is in NORMAL
  42.                                   position (pointing horizontally
  43.                                   towards the back of the monitor).
  44.                                   Refer to the Color Adjustments
  45.                                   procedure (in "Adjustments" section)
  46.                                   for switch location.
  47.                                2. Check the yoke connector.
  48.                                3. Replace the main logic board.
  49.                                4. Replace the CRT.
  50.  
  51.  
  52. One vertical                   1. Check yoke connector.
  53. line appears                   2. Replace the main logic board.
  54.                                3. Replace CRT.
  55.  
  56.  
  57. One side of the                Replace the CRT.
  58. raster is a
  59. different height
  60. than the other
  61. (keystone effect)
  62.  
  63.  
  64. Abnormal raster                1. Check to make sure all connectors
  65.                                   are installed correctly on the
  66.                                   boards.
  67.                                2. Replace the main logic board.
  68.  
  69.  
  70. Horizontal                     Replace the main logic board.
  71. linearity
  72. won't adjust
  73.  
  74.  
  75. Monitor makes                  1. Replace the main logic board.
  76. high pitched                   2. Replace the power supply board.
  77. noise
  78.  
  79.  
  80. Raster is small                1. Check the yoke connector.
  81. and abnormally                 2. Replace the main logic board.
  82. bright                         3. Replace the CRT video board.
  83.                                4. Replace the CRT.
  84.  
  85.  
  86. No vertical                    1. Adjust the VERTICAL HOLD control on
  87. synchronization                   the back panel.
  88.                                2. Replace the main logic board.
  89.  
  90.  
  91. Raster won't                   Replace the main logic board.
  92. center
  93.  
  94.  
  95. Can't adjust                   1. Replace the main logic board.
  96. color, contrast,               2. Replace the CRT video board.
  97. brightness,
  98. etc.
  99.  
  100.  
  101. Characters                     1. Make sure all ground straps are
  102. jitter                            secure.
  103.                                2. Verify that adjacent computer
  104.                                   equipment is properly grounded.
  105.                                3. Replace the power supply board.
  106.                                4. Replace the main logic board.
  107.                                5. Replace the CRT video board.
  108.  
  109.  
  110. Vertical                       Replace the main logic board.
  111. linearity
  112. won't adjust
  113.  
  114.  
  115. Black spot remains             1. Replace the CRT.
  116. when unit is off               2. Replace the main logic board.
  117. (burnt phosphor)
  118.  
  119.  
  120. Picture too                    1. Adjust the external BRIGHTNESS
  121. dark or                           control.
  122. too bright                     2. Replace the main logic board.
  123.                                3. Replace the CRT video board.
  124.  
  125.  
  126. Out of focus                   Replace the main logic board.
  127.  
  128.  
  129. Raster is one                  1. Replace the main logic board.
  130. predominant                    2. Replace the CRT video board.
  131. color
  132.  
  133.  
  134. No color                       1. Make sure that the software is
  135.                                   supposed to display in color.
  136.                                2. Replace the CRT video board.
  137.                                3. Replace the main logic board.
  138.  
  139.  
  140. Monitor turns                  Replace the main logic board.
  141. itself off
  142.  
  143.  
  144. Flashing or                    Gently crimp the metal connector tabs
  145. wavy screen                    on the video connector.
  146.  
  147.  
  148. Copyright 1988 Apple Computer, Inc.
  149.  
  150.