XV-Z91E (serv.man34). Software correction of picture position in 576P signal, horizontal keystone function picture roll in game console connection - Sharp Projector Technical Bulletin (repair manual). Page 5

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LV077
Sharp Electronics (UK) Ltd., Technical Services Group
3-(9) Plug the AC cord into the projector. Then software upgrade start automatically.
You can check the status at the gage (see the following Fig. 3-3)
**NOTE** Please do not turn the projector off when upgrading the software.
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