This unit was made in Singapore by Sharp, by the way.
How to clear the "Common failure F-94" error? (this is a start-up check-sum error that usually arises by having rubbish in the time and date addresses, due to all system batteries being totally depleted. The solution is to restore time and date to current, or at least valid, values):-
1) Whilst holding down "Panel lock" button at rear of unit, hold down "Stop" and “On/off" together at the front panel. This should bring up "Modify Config" in the top window.
2) Step through config options by pressing "Next" (which should now be lit) to get to "Time".
3) Enter correct time using the number keys.
4) Press green "Pri Start" key to store changed time.
5) Step to "Date", and enter correct date using the number keys.
6) Press green "Pri Start" key to store changed date.
7) Once valid entries have been made, switch off at "On/off".
8) Re-start the unit. Error code should have been cleared!
(sincere thanks to Ed Bennett, the Master of Minutiae, for helping me out with this one)
