Acer 7277e Service Manual page 26

Fig.2 Pincushion Measurements
=
A, B represented as display area width and height
Top/Bottom Pincushion = (a1 or a2)
Side Pincushion = (b1 or b2)
substituted A by (PS + QR)/2
1-20
B by (PQ + RS)/2
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7277e Monitor Service Guide