Barco FLM series Service Manual page 39

Situation
The liquid cooling circuit of the light
processor is mistakenly excluded
from the main liquid cooling circuit.
Water cooling pump electrical
disconnected.
Blocked high density filter of the
heat exchanger.
No or insufficient liquid inside the
cooling circuit. The pump is sucking
air and sounds noisier then normal.
Malfunction pump of the water
cooling circuit. You don't feel any
vibrations when touching the pump
after activating the "Refill mode" via
the user interface:
Service > Refill mode >
Yes
Note: to exit the "Refill mode" you
have to switch off the projector.
Error 7684 : "Blue front DMD temp short"
This error may be preceded by a warning. This error can only appear on the FLM HD series. Note that the FLM HD series have
three temperature sensors per channel. The first sensor (A) is visible on top of the cooling block, the second sensor (C) fits between
the thermoelectric cooler (B) and DMD and the third sensor (D) is located at the front of the DMD. The illustration below shows the
temperature sensors or the wire units leading to the sensors for the red channel. Nevertheless, the sensors for the red and green
channel are in the same manner positioned.
Image 3-17
A Temperature sensor on the cooling block of the blue channel.
B TEC (Thermoelectric cooler) located between DMD and cooling block.
C Wire unit leading to the temperature sensor at the back side of the DMD.
D Wire unit leading to the temperature sensor at the front of the DMD
R59770072 FLM SERIES 19/03/2007
Solution
Reconnect the cooling circuit of the light processor with the pump and heat exchanger.
Check if the wire unit (ref C image 3-13) of the pump is properly connected.
Replace the blocked high density filter with a new one.
Fill the cooling circuit with liquid and expel all air. Pressurize the circuit. See "FLM
liquid cooling circuit", page 153.
• Check the electrical resistance of the pump's winding. Replace the pump if infinite.
See "Cooling pump replacement", page 197.
• Drain the liquid cooling circuit, open the pump and check if the pump is not blocked.
If so, remove the rotor (ref R image 3-13) and clean the bearings of the pump. See
"Maintaining the cooling pump", page 190.
A
B
C
D
3. Troubleshooting
37