Yaesu FT-901DM Maintenance Service Manual page 73

SERVICING
WWV/JJY MODIFICATIONS
FT-901 transceivers for the first production lot
were equipped with 5 MHz WWV coverage. From
the second production lot, this was changed to
15 MHz. Units destined from the Japanese
domestic market all are equipped for 5 MHz.
Orange 'Yellow
Brown
W/Violet
wwv 10D
CHASSIS BOTTOM SIDE
Modification Procedure:
qd)
Q)
(3)
(4)
Band switch segment Sie and Sj,'s red jumper
wires: move to 80 m contact (5 MHz) or 20m
contact (15 MHz).
3-18
Locate bandswitch segments (e) and (g).
Refer to the drawing for reference.
For WWV 5 MHz reception, the red jumper
wires on these wafers must be connected
between the WWV terminal and the 80 meter
terminal.
For WWV 15 MHz reception, the red jumper
wires must be connected between the WWV
terminal and the 20 meter terminal.
Make the component changes as shown in
Table 1. Peak T1310 for a reading of 80-150 Mv
at the OUT terminal (pin 16) of the XTAL
UNIT.
—s
f
e
d
=
Band switch segment location