Do you have a measuring cap for the Old Fashioned Movie Time Popcorn Maker model #OFP- 501

You should return it to where you bought it. They are not repairable.

Let it cool to see if the reset resets, if not, it is time to throw it away. There are no parts or repairs that can be done to that model.

I got persistent following a Yahoo.com search:
This is a 12-page PDF file:
http://nostalgiaelectrics.com/manuals/ofp-501.pdf

The kernel measuring cup is pictured on page 6, and its capacity is 6 tablespoons (=18 teaspoons).

http://static.highspeedbackbone.net/pdf/OFP-501[1].pdf

The Nostalgia Electrics OFP501 Old-Fashioned Movie Time Popcorn Maker is a HOT AIR POPCORN MAKER. Oil is not used in this machine.

Refer to Page 6 of the User Manual for complete instructions:

http://nostalgiaelectrics.com/manuals/OFP501.pdf

The User Manual for the OFP-901 Old Fashioned Popcorn Maker can be found here:

http://nostalgiaelectrics.com/manuals/ofp-901.pdf

Instructions for use can be found on page.

This model is a HOT AIR popper; oil SHOULD NOT be used in this machine.

Simply fill the kernel cap with with kernels and then pour the kerneles down the hole on the top of the unit. Plug in to power supply. Turn on; kernels should pop 2 tp 2 1/2 minutes.

Make sure you place a large enough bowl under the chute!

No oil needed - is hot air popper. Use round lid on top to measure popcorn, pour popcorn into metal part in center of popper.

read a comment from some one that had the same machine.

The website for the manual is http://www.nostalgiaelectrics.com/default.asp?a=service