I just got a non-working Xpander (that seems to be a Rev. A U.S. made one). After a power supply recap and full cleanup- I'm getting a "Voice Processor Malfunction" warning. FYI- the U.S. made on uses the Hitachi 68B09P. I read another post elsewhere where the user replaced their 68B09EP chip. I assumed the U.S. Model uses the same chip but it doesn't.
It's a REALLY easy fix but you need to be extremely careful. I took the thinnest flathead screwsdriver I could find: you need to be gentle and pop the button cap off (while the pot and processor boards are installed as normal). The flathead tip should easily fit into one side while the button's snug against the opposite edge.
You'll have full access to the actual exposed switch assembly once the cap is removed: push it in the opposite direction of the edge the button sticks to using the flathead tip. Pop the top cap on (should line up and snap in easily).
Be careful and make sure the flathead won't slip while between the cap and bottom switch assembly before you pry it off.
It's actually simpler to do than explain but just make sure the tip doesn't slip and scratch the cap.
