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1)Have you tried wringling the cable where the cable joins the handset and the control panel. Do this with the power off. There might be a bad connection on the pins.
2) Try swapping the cable between the handset and the control panel around.
3) try using a different cable if you have one.
4) try using a different handset, there might be a NSEW key which is stuck down.
5) Is the clock working? I have found that due to flat internal battery, the clock wasn't working on start up. There was a drift of about 1 sec per sec in RA. Restting the clock, the problem disappeared.
Brendan
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