Sony ILCA-77M2 How To Use Manual page 148

4. Detach the lens.
5. Push the mirror lock lever (A) and open the mirror.
6. Use the blower to clean the image sensor surface and the surrounding area.
7. After you finish cleaning the image sensor, push down the mirror until it clicks.
Push down either side (B) of the mirror.
8. Attach the lens.
When you attach the lens, confirm that the mirror is completely pushed down.
Note
A blower is not supplied with this product. Use a commercially available blower.
Cleaning can be performed only when the battery level is
Do not use a spray type blower as it may scatter water droplets inside the camera body.
Do not put the tip of a blower into the cavity beyond the lens mount area, so that the tip of the blower
does not touch the image sensor.
Hold the camera slightly face downward so that the dust falls out.
Do not subject the product to any shock during cleaning.
When cleaning the image sensor with a blower, do not blow too hard. If you blow the sensor too hard,
the inside of the product may be damaged.
When you attach the lens after you finish cleaning the image sensor, confirm that the mirror has been
completely pushed down. Otherwise, it may damage the lens or lead to a malfunction. Also, if the
mirror has not been pushed down completely, the autofocus system will not be able to achieve proper
focus.
You cannot shoot with the mirror open.
(3 remaining battery icons) or more.