Sorry, I may have mislead you with my suggestions as of course I was thinking of my own keyboard which is a KN7000.

However, thinking about your very worrying problem and how frustrated you must feel, may I suggest you contact GRAHAM TILNEY at Technote International. This is a very reputable company who are dedicated to continue to help us Technics owners and if they cannot tell you right away (and I'll be surprised if they cannot), I am sure they will do all in their power to find out what the answer is. Their details are as follows:-

UNITED KINGDOM: (Orders & Enquiries)
Techplus Club, Steel Close,
Eaton Soco, Eaton Socon, St. Neots, Cambs
PE19 8TT England.
Telephone No. 01480 470320
Fax. 01480 470284
Email: enquiries@technote.com

U.S.A. and CANADA: (Orders & Enquiries)
Telephone No. 1-800 580 4050
Tel: (outside USA) 813 630 5003
Fax. 813 630 5001
Emails: usa@technote.com

As this is a Technics Club of which I am a member, it may be necessary for you to mention my name "Audrey Turner"

Also, you may have to add the English International prefix code if telephoning from outside the U.K. Unfortunately, I do not know what this currently is as my phone book is 2 years old.

Good luck!

Aud (U.K.)