Wurlitzer Lyric E

[sanyo1408]

I have a 1963 Wurlitzer Lyric E JB which has developed a fault.When i choose a letter from the RH bank F-K,all i get is a buzzing noise and it wont select.The LH letters A-J and the number selection all work fine.any  advice as to what  the problem might be?

[jukenorman]

There's an interlock switch associated with each switch bank section, make sure it's clean. If in doubt check the sticky on contact cleaning.

Norman.