4. Troubleshooting
Code 5471: “lamp cathode fan - voltage high” (Warning)
Situation Solution
Malfunction Fan Control board or
SMPS board.
Measure on the Signal Backplane the +24V voltage on pin 9, 10, 11 or 12 of the
connector of the black wire unit which com es from the SMP S board. Se e im age 4-26.
If the measured voltage is about 24V then replace the Fan Control board. See
"Removing a board in the card cage", page 213. O therwise replace the SMP S board.
See"Replacement of the S witched M ode Power Sup ply", page 281.
Code 5472: “lamp c athode fan - voltage too low” (Error)
This error code is probably proceeded by the warning code 5473: “lamp cathode fan - voltage low”. The same tr
oubleshooting table
can be applied.
Code 5473: “lamp cathode fan - voltage low” (Warning)
Situation Solution
Malfunction Fan Control board or
SMPS board.
Measure on the Signal Backplane the +24V voltage on pin 9, 10, 11 or 12 of the
connector of the black wire unit which com es from the SMP S board. Se e im age 4-26.
If the measured voltage is about 24V then replace the Fan Control board. See
"Removing a board in the card cage", page 213. O therwise replace the SMP S board.
See"Replacement of the S witched M ode Power Sup ply", page 281.
Damaged insulation of the w ire
unit (reference 1 image 4-30)
of the Cathode fan (reference 3
image 4-30).
To Check the ins ulation of the wire unit of the Cathode fan, pull o ut the wire unit
(reference 1 image 4-30). T he Cathode fan is located at the right inner side of the Lamp
compartment.
1. Repair the insulation of the wire unit using shrink sleeve.
2. If not repairable replace the Cathode fan. See "Lam p cathode fan", page 31 9.
Malfunction Signal Backplane (bad
connection)
Replace the Signal Backplane. See "Replacement of th e s ignal back plane", page 231.
1
2
3
Image 4-30
Cathode fan connections
54 R5905043 DP2K-12C/11CX 19/02/2018
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