Long time ago but I THINK there was a jumper you could move
on the 9-152-? module. BUT I may be thinking of another brand.
Also try the RF AGC control on the 9-151 board. And the norm-spcl
aft switch AND the TV-CATV-HRC switch on front panel.
There probably a Tech Topics on it but I thew them all out yrs ago
Maybe someone else remembers.
73 Zeno
LFOD !