Main Board 18463-1 (4W7HJ / 3JMDT / RM5DR) Compatible with Models 3990, 3991, 3888, 3881

Replacement main board compatible with device models 3990, 3991, 3888 and 3881. Includes part number 18463-1 and assembly identifiers 4W7HJ, 3JMDT, RM5DR. Perfect for repairs or refurbishments—please confirm this board’s part codes match your unit before purchasing.