KX-TG8621RUM, KX-TGA860RUM - Panasonic Telephone Service Manual (repair manual). Page 85

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(*1) Reconfirm the model No. written on the handset’s name
plate when replacing PCB100. Because the model No. of
the optional handset may differ from the included handset.
(*2) When replacing IC4, IC3 or X1, make the adjustment
using PNZZTG8621RU. Refer to Handset (P.58) of Things
to Do after Replacing IC or X'tal.
(*3) When removing E106, use special tools (ex. Hot air
disordering tool).
(*4) When replacing the handset LCD, See How to
Replace the Handset LCD (P.48).
(*5) Backside of this IC has a ground plate. Refer to How to
Replace the Flat Package IC (P.62).