about RISO HC 5500

i got used Riso HC 5500 machine for my printshop its with cable lift system
it gives errer S03-250
when i refer technical manual its cause not moving PB spacer properly to left end
i check the machine then i noted the dilivery table is beyond its top level so BP spacer dont move through the shaft from the print head housing
so anyone please let me know how to adjust its top level a few mm distance down

thanks for your kind assistance ..
priyantha mudalige
NEW ROYAL INTERNATIONAL
SRILANKA