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the first knob has tree positions in the middle is off to the left the top (grill) heats to the right top (grill) and bottom heat, the second knob indicates the temperature in the following way ..50....100....150....200....250..good luck
The Regal switched it's temperature control module look around that time So it couple be one of two options.
First is the older "slide" type module. For this you move the top of the two left to right functioning settings all the way to the right to engage the defrost and the bottom one all the way to the right to engage the heat.
The newer ones have knobs that turn in which case the knob on the far right turns it all the way to the right to engage the defrost and the knob in the middle to the far right to get the most heat.
If you have any comments please feel free to leave them here.
The knob you are talking about is called the x-axis control knob. It does not directly affect the focus. What affects the focus is the slight manipulation of the stage and or slide while you are adjusting the x-axis control knob. It only takes the slightest pressure to throw the focus off very far. Theoretically you could completely remove the specimen holder and move the slide around with your fingers.
The specimen holder may need to be replaced but without further more detailed knowledge of the mechanical problem I cannot instruct further.
The tool has an adjustment control to keep centered on the tool. Should be a knob on the side of the tool. Run the tool with the belt on, and as you adjust the knob you'll see the belt migrate left and right; adjust the knob to where the belt is centered on the tool
Try holding the Right knob so it does not move, whilst firmly moving the Left knob towards you (clockwise), this is the adjusting method used on Zeiss Jena 1960's High End microscopes, e.g Eduaval & Ergaval.
This is a simple fix as long as the oven is heating properly and the only problem is that the temp seems higher than what the temperature control knob indicates...
Purchase an inexpensive oven thermometer from the hardware store and place it in the center of the oven. Set the temperature control knob to 350 degrees F.
Check the temperature indicated on the thermometer in the oven after 20 minutes. If it's not within 5 degrees of 350, you'll need to adjust the oven's temperature control.
Turn the oven off.
Pull off the temperature control knob. You can usually pull it off by hand, pry it off with a thin screwdriver, or slide a piece of cord up behind it and pull.
Note which kind of temperature control knob you have. There are two types: The first has a screw in the shaft of the knob; the second has an adjustment dial on the back of the knob.
Adjust the temperature with the first type by turning the screw in the shaft with a screwdriver. Turn it clockwise to lower the temperature; turn it counterclockwise to raise the temperature. Turn the screw just a little bit in the appropriate direction.
Adjust the temperature with the second type of knob by turning the dial on the back of the knob. (This dial is held in place with a screw or a clip that will need to be removed.) Raise the temperature setting by turning the dial counterclockwise; lower it by turning the dial clockwise. The notches are typically in 5 or 10-degree increments.
Test the oven temperature again.
Repeat until you're in the right temperature range.
You should be able to simply push the new knob right on the switch shaft. If part of the broken knob shaft is on the switch, remove it first before installing the new knob. If you see that the switch shaft is broken off, replace the switch as well.
Hope this helps.