Printed in white ink on the edge of the component side
Rubber stamped immediately to the right of the Assy #
Handwritten on a yellow sticker on the Thermocouple input
Printed on the edge of the solder side of the board
Printed in black on the extraction lever
Printed in white ink on the component side
overall: 1/2 in x 4 1/2 in x 10 1/2 in
This double sided 7401A circuit board has a large "thermocouple" module with eight inputs and two check boxes. The one labeled "60Hz" is checked. Below that module are two rows of integrated circuits with some passive components. In the first row below the module there is a 522.24K crystal with "MF" stamped on the top. The "thermocouple" has three accessible variable resistors near the extraction lever. On the insertion end on the lower corner there is a green sticker. There is one quality control stamp on the solder side and one on the component side.