Schematic? Do you want to take all the smoke out of doing this? LOLif this is the washington with the MB8719 PLL chip in it then change R204 to a 1.2K ohm resistor, and add a 1uF non-polarized capacitor from pin 9 of the audio chip to the junction of R121, R204, and D62.
make sure to restore any modulation mods to stock before doing this mod.
you do need a scope to set it right.
LC