IC-8500
Remove the top cover and locate the main PC board (it’s to the rear or
the
chassis and holds the speech option, see the operators manual). R516,
R517
and R518 is located in the right hand corner inside the small metal
can.
There will be 4 adjacent resistor positions with 2 positions populated
(R517 & R518)the top position is unknown. The small metal can is
located
on the right hand side of the main board. R455 is located below and to
the
left of J12 (the speech module connector). R455 is also unpopulated and
it’s to the left of R140.
If you can’t find a 603 size surface mounted resistor, carefully
unsolder
an exsisting resistor and re-populate it in another position. R455 can
be
replaced with a zero Ohm resistor by shorting the position with a fine
stran of wire that was taken from a ribbon cable.
After the modification, the radio will lose it’s memories and will
require
reprogramming.