This module consists of an double-sided circuit board within four rows of components mounted on the component side. This side is populated with ten diodes, six transistors, three capacitors, one choke coil, and resistors. The row of components nearest the connector consists of four units that have five pins and "Sprague 518436." Stylized letters are printed in solder on the component side of the board; these appear to be coordinates for each column of components, although the letters don't align with the columns. There is a barely visible quality control stamp on the component side.
Identifying Numbers
YCK29C
Stamped in black ink on the component side of the board.
Other number
13
Stamped (upside down) in black ink on the component side of the board.
Other number
518431
Printed in solder on the component side of the board.
Other number
738
Printed in solder on the component side of the board.
Other number
A
Printed in solder on the component side of the board.