Pentax K20D - Manual (Page 255)

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Raise the mirror up and open the shutter to clean with a blower. Please
contact PENTAX Service Center for professional cleaning because the
CMOS sensor is a precision part. Cleaning services involve a fee.
You can use the Imagesensor Cleaning Kit O-ICK1 (optional) when
cleaning the CMOS.
1
Turn the camera off and remove the lens.
2
Turn the camera on.
3
Select [Sensor Cleaning] in the [R Set-up] menu.
Removing Dust with a Blower
• Do not use a spray type blower.
• Do not clean the sensor when the exposure mode is set to p (Bulb) mode.
• Always cap the lens mount area to prevent dirt and dust from accumulating
on the CMOS sensor when no lens is on the camera.
• When the battery level is low, [Not enough battery remaining to clean sensor]
is displayed on the monitor.
• If you are not using the AC adapter D-AC50, please use a battery with ample
capacity remaining. If the battery capacity becomes low during cleaning, a
message will be displayed on the monitor and a warning beep will sound.
Please stop cleaning immediately.
• Do not put the tip of the blower inside the lens mount area. If the power is
turned off, this could cause damage to the shutter, CMOS sensor or the
mirror.
• It is recommended to use the AC adapter D-AC50 (optional) when cleaning
the sensor.
• The self-timer lamp blinks and [Cln] appears on the LCD panel while cleaning
the sensor.
• This camera features a CMOS sensor shifting shake reduction system, and
it may generate a vibration sound while cleaning the CMOS sensor. It is not
a malfunction.