Oki Microline 520 Service Handbook page 264

4.9.02 Printhead
Interconnect Diagram: Control Board to Printhead
NOTE:
The printhead coil resistance values ARE NOT LISTED.
The individual printwire control lines CANNOT be accessed on this printhead.
Failure Analysis 4 - 56 Microline 520/521 Service Handbook
4-9-02.pcx
P/N 59257803