This is a used tested good
AIWA remote RC-TN500EX
Audio system remote
Works with;
CXN3400, CXN3500, CXN3500U, CXN350MHE, CXN510,
CXN510G, NSX3400, NSX3500, NSX3501,
NSX350YUBBLK, NSX351, NSX3550, NSX50, NSX510G

Please be sure this is the right remote for your system.
You can search the internet for the manual for your system and verify the remote.

Item # 4181