View Panasonic KX-TG5521RUB / KX-TGA551RUB (serv.man2) Service Manual Supplement online
1.2. ORIGINAL AND NEW PARTS COMPARISON
TG5521RUB/KX-TGA551RUB, Order No. KM41007179CE.
*The following items (1-8) indicate the reason for change. See the “Notes” column for each part in ORIGINAL AND NEW PARTS
1. Improve performance
*m: Discontinued (To be replaced with a new part)
3. To meet approved specification