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| CONTROL UNIT |
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SYMPTOM |
| DIAGNOSTIC PROCEDURE | ||
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Radio dead at | a. | Check the battery connections and the Red lead A+ fuse on the power | ||
(display dark and no |
| cable. |
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lighted indicators) | b. | Turn the unit "OFF," then simultaneously press and hold the | ||
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| "EMERGENCY" and "OPTION" buttons, while turning the unit "ON." | ||
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| All indicator lights and all display dots should light. Release the buttons | ||
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| and the display should show the following message: | ||
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| © - 1993 | or | © - 1994 |
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| EGE |
| EGE |
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| This indicates the Control Unit is functioning correctly. If this passes, | ||
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| check programming and feature encryption, using "EDACS3" PC | ||
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| Programming utility. |
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| c. | If this fails, measure A+ voltage at MIC connector Pin 6 (referenced to | ||
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| ground at Pin 7). If this fails, check fuse F601 on the Logic PWB for A+ | ||
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| on each side of the part. Replace the PWB if it is open circuited. | ||
| d. | If the fuse is OK, check the connection of the Flex Circuit PC2 with J701 | ||
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| on the Logic PWB. If this fails, reconnect PC2, making sure the side tabs | ||
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| are locked. | ||
| e. | If this passes, check the programming and feature encryption, using | ||
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| "EDACS3" PC Programming utility. If this symptom persists, substitute a | ||
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| known good Logic PWB, and |
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| f. | If no A+ is present at MIC Pin 7, check for A+ on the Logic PWB J704 Pin | ||
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| 3. If this fails, check the J704/J1004 connection. If this fails, replace the | ||
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| PA module. If this passes, replace the Logic PWB. | ||
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The Display lights, then | a. | Turn the unit "OFF," then simultaneously press and hold the | ||
goes dead. |
| "EMERGENCY" and "OPTION" buttons, while turning the unit "ON." | ||
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| All the indicator lights and all display dots should light. Release the buttons | ||
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| and the display should show the following message: | ||
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| © - 1993 | or | © - 1994 |
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| EGE |
| EGE |
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| This indicates the Control Unit is functioning correctly. If this passes, | ||
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| check programming and feature encryption, using "EDACS3" PC | ||
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| Programming utility. |
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| b. | If this passes, check the connection of the Flex Circuit PC2 with J701 on | ||
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| the Logic PWB. If this passes | ||
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| locked. |
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18
