136
H4D
Care and maintenance of sensor unit
Handling and storage
• Always replace the protective CCD/filter cover when the sensor unit is not mounted
on the camera.
• Do not touch the exposed CCD/filter with your fingers.
• Keep all foreign objects out of the camera opening.
• Store the sensor unit away from moisture and excessive heat.
• Protect the sensor unit from impact–do not drop it.
Cleaning the CCD Infrared Filter
If you see dark or colored spots or lines in your images, then you may need to clean
the outer surface of the sensor unit’s infrared (IR) filter. In most cases, the careful use
of compressed air will be adequate though if you use canned compressed air, read the
instructions very carefully before use to avoid spraying impurities or even ice on the
filter! Sometimes, however, small particles will get stuck to the surface of the IR filter,
requiring for a more thorough cleaning, involving either fluid or wipes. For a good safe
cleaning, follow descriptions below.
Basic air-cleaning procedure / removing the sensor unit
1. Remove a FireWire if connected.
2. Remove the viewfinder.
3. While pushing the safety catch backwards on the sensor unit (3 illus. A) push the
lever of the sensor unit release button to the right (3 illus. B) and while maintaining
that position press the centre of the button firmly inwards towards the camera body
(3 illus. C) to finally release the magazine.
4. Clean the outside surface of IR filter by spraying it with clean compressed air (see
warning above first). If this is not enough, then use one of the procedures outlined
below.
5. Reattach the sensor unit to the camera immediately after cleaning to check results.
6. If you still see spots on your shots after you have cleaned the outside of the infrared
filter, then you may have dust either on the inside of the IR filter or on the CCD itself.
N o t e
Never attempt to remove the glass
filter from the front of the CCD
–
you
will probably ruin the CCD if you do
so. If dust manages to get between
the IR filter and CCD, it can only be
removed at the Hasselblad factory.
Contact your Hasselblad dealer for
assistance.
1
2
A
3
C
B
