Chapter 4: Troubleshooting
Troubleshooting Tables
Service Manual 4-41
4.4.10.2 Loss of Up/Down Control from One Foot Switch
Blown fuse 7.
Remove observation light transformer bracket on
Power PCA in order to check fuses.
5.5 mm Hex
Wrench
8.
Remove and check fuses F1, F4. Replace as
necessary.
Needle nose pliers,
Ohm Meter
Disconnected
harness
9. Remove Upper Housing. 3 mm Hex Wrench
10.
Check connector and terminals for AC harness at
Power PCA J28.
AC harness part #:
6600-1558-700
Defective harness 11. Check in-line connectors and terminals.
E-Base harness
part #:
6600-1562-700
12.
Disconnect in-line connectors and check AC
voltage on pins 1,3 of E-base harness at top of
West Rail.
13.
Re-connect inline connectors and check AC
voltage at E-base AC inlet connector.
14.
Check E-Base fuse at the AC inlet connector. If OK,
then is most likely a foot switch issue (skip to
section 4.4.10.2).
Defective Power
PCA
15.
Check the voltage on Power PCA at test point 26
from 2-1 and verify that it is greater than 2V (by
probing back of connector). If OK, verify mains
voltage is present at Power PCA connector J28
pins 3-6. If not, replace the defective Power PCA.
Defective Control
PCA
16.
While in Service Mode, check the voltage on Power
PCA at test point 26 from 2-1 and verify that it is
greater than 2V (by probing back of connector) to
verify that the enable/disable control and listen for
the relay click. If tests fail, check/replace 20 pin
ribbon cable connected to the Power PCA at J23.
Otherwise, replace the Control PCA.
20 pin ribbon
cable part #:
6600-1411-601
Possible Causes Step Troubleshooting Procedure Comments
Defective foot
switch
1.
Remove E-Base shroud. Verify connectors from the
foot switch pedals. If all is OK, replace defective
foot switch.
Possible Causes Step Troubleshooting Procedure Comments
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