Need replacement lamps for under micro--surface light

Normally a 25 watt, SES (small edison screw) appliance bulb. They are normally accessed from a panel on the outside just behind where you see the light from the inside.

Perhaps 'micro' doesn't mean 'microwave', but you put it in the microwave category.

https://www.google.com/search?q=Grundig+34CS

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Search is only bringing up Grundig Radio pictures.

Hi Ann
"Chef's Mark - change oven lamp"..
To access the oven lamp on most micros, you need to remove the entire housing cover. As potentially lethal voltages can be present, either get an electrician / technician to do it, or if you can, work with caution.
Most important, UNPLUG FROM MAINS POWER.
Once cover is loose, bottom side and rear screws removed, spread sides slightly and shift cover backwards until off.
Ensure that the high-voltage capacitor or its connected wiring to magnetron gunn is NOT touched. Will add pretty pictures. The capacitor has an internal resistor to dissipate stored HV charge when switched off, but as a precaution, treat all HV as potentially live and dangerous.
The globe and holder are on the AC mains side of the transformer, so provided micro is unplugged, this is perfectly safe to touch.
The globe usually has an 'Edison-screw' cap, smaller than the standard domestic type. Take sample to your electrical spares supplier, esp one that specializes in microwave spares, otherwise one of the same electrical parameters will work. What Wattage, Verify Voltage, Confirm Cap.Edit: also see answer re Magic Chef procedure. More user friendly.

There is a possibility that the light relay is stuck on. Sometimes a sharp tap on the relay will fix it. If not the control board will need replacing.

There are wires going from the main board to the surface lamp and turntable. They are thin orange, yellow and blue wires. I think the surface lamp is yellow and the turntable wires are orange. You should first try taking the bottom cover off. There are about 8 screws under neath and the bottom cover hinges on the back edge, just let it hang. You can now see the wires. Those wires short to the case where they go through from the main board to the lamps or turntable motor. You now have to move them away form the case. Sometimes they get pinched to the metal cabinet by the lamp socket area. Look for signs of pinched wiring there at the lamp socket or where they go through. Move them away, tape up the bad area.

Usually removing the appliance from the mains supply and taking the case off will reveal where the lamp is and depending whether it is an ES or Lucar fitting will depend on how tp remove it.
It is quite straight forward.
Replace the lamp with an identical lamp.
Hope that helps.

Micro wave as the name suggests produces heat when the micro waves aimed at an object causes the water molecules inside the object to vibrate hence producing heat.The gadget responsible is the magnetron. If your magnetron is not receiving ht voltage or receiving but faulty, then your micro wave wont work please take precaution when opening micro wave due to high voltage caps that remain charged sometimes even when it is off.check the high voltage fuse/ diode and capacitor if they are fine and the step up trans former o.k then the only option is to replace the magnetron

went to the store a got a new one

If the lamp socket has power (and it's the right voltage) and the replacement lamp is the correct one and tests good, then the trouble is in the socket. It may have been damaged when the original lamp went "poof." Check for damaged contacts (burnt or broken off). Also, make sure you're seating the lamp correctly in the socket. If the bulb is a push-and-turn ("bayonet") type, you may be facing it the wrong way and it's not going all the way in.