Taskalfa 3050ci always shows A3 in preview window

[taskalfa]

Has anyone seen this issue , im getting A3 displayed in preview window, if i place a4 paper on scan glass as soon as i close the adf is shows as A3, auto feeder is fine

[Kyo fan]

Clean paper size detection sensors under the glass. May as well clean entire optical section while at it..

[CWP]

Check the switch on the back right corner of the machine that the DP actuates when it is closed; I have seen them knocked out of position causing this issue. It is on the machine but the DP actuates it when closed.

[Geo]

You also may need to extend the length of the plunger activator.

[taskalfa]

Replaced the pwb ISC and all is good, strange thing was if I disconnected the adf it would read the correct size off the glass, as soon as I plugged in the adf it would always read A3 of glass