Yaesu FT-901DM Maintenance Service Manual page 66

SERVICING
CIRCUIT TRACE REPAIR
Most of the printed circuit boards used in the
FT-901 are single sided boards. However, occasion-
ally a double-sided board is used, in situations
where high shielding is required. A comparison of
the two types is shown below.
Copper
Single Sided Plastic/Phenolic/Glass
Board "The Base Material"
Double Sided
Board
Plastic/Phenolic/Glass
The component side is always opposite
the solder side (even if both sides
are plated)
"2" wire, used to connect
between two sides of a
double sided board.