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BI-39175A
18
CONTROL UNIT
SYMPTOM DIAGNOSTIC PROCEDURE
Radio dead at power-on
(display dark and no
lighted indicators)
a. Check the battery connections and the Red lead A+ fuse on the power
cable.
b. Turn the unit "OFF," then simultaneously press and hold the
"EMERGENCY" and "OPTION" buttons, while turning the unit "ON."
All indicator lights and all display dots should light. Release the buttons
and the display should show the following message:
- 1993 or
- 1994
EGE EGE
This indicates the Control Unit is functioning correctly. If this passes,
check programming and feature encryption, using "EDACS3" PC
Programming utility.
c. If this fails, measure A+ voltage at MIC connector Pin 6 (referenced to
ground at Pin 7). If this fails, check fuse F601 on the Logic PWB for A+
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
on the Logic PWB. If this fails, reconnect PC2, making sure the side tabs
are locked. Re-check the MIC connector Pin 6 for A+.
e. If this passes, check the programming and feature encryption, using
"EDACS3" PC Programming utility. If this symptom persists, substitute a
known good Logic PWB, and re-program.
f. If no A+ is present at MIC Pin 7, check for A+ on the Logic PWB J704 Pin
3. If this fails, check the J704/J1004 connection. If this fails, replace the
PA module. If this passes, replace the Logic PWB.
The Display lights, then
goes dead.
a. Turn the unit "OFF," then simultaneously press and hold the
"EMERGENCY" and "OPTION" buttons, while turning the unit "ON."
All the indicator lights and all display dots should light. Release the buttons
and the display should show the following message:
- 1993 or
- 1994
EGE EGE
This indicates the Control Unit is functioning correctly. If this passes,
check programming and feature encryption, using "EDACS3" PC
Programming utility.
b. If this passes, check the connection of the Flex Circuit PC2 with J701 on
the Logic PWB. If this passes re-connect it making sure the side tabs are
locked.