change channel, memory channels, memory bank, radio locked
IC-7100 / Cannot change memory channels or banks Problem: When you turn the M-CH/Bank knob or ring, the radio does not change from the current memory channel or bank

Solution: Turn off PBT (passband tuning).
Check the face of the radio just below the M-CH/Bank knob for a light next to "PBT". If that is illuminated, the passband tuning is engaged, and you cannot change channels on the radio. To turn off PBT, press the M-CH/Bank knob. You will feel and hear it click in and see the light next to PBT go out. Then when you turn the knob, the channel will change.