Sharp R-1872 Convection/Microwave Oven "850 keypad" Questions

...Model R-9h54 Dear Sirs, I purchased a Sharp Carousel Convection Oven. Model R-9h54. Power output 850 w Serial no: 930701206 (Made in Japan) around 1986 The unit has served me well for over 20

...850 w Serial no: 930701206 (Made in Japan) around 1986 from Sharp in Sir Lowery Rd. Woodstock Cape Town. The unit has served me well for over 20 years and I hope it can serve me for another 20 years. ...