Ramsey Electronics FX-440 Manual page 80

the speaker. There should be no hiss or whistle. Touch the center
terminal of the volume control, and you should hear a moderate
AC hum. If you wish, connect a test oscillator or line-level audio
source to the input line to the control. You should hear a
generous level of good quality audio sound.
3. Disconnect DC Power before proceeding with assembly.
4. The volume control, speaker and other wired connections are installed
quite early in the assembly sequence so that tests can be
performed periodically during assembly. The disadvantage to this
approach is that there is considerable wear and strain on the
various wire connections as the PC board is repeatedly flipped
back and forth during assembly. This is a serious consideration
because most radio malfunctions are due to broken wires and not
component failure. For this reason, such wiring is usually done at
the final stage of assembly. To minimize damage to the controls
and wiring, . use one of the supplied wire cable ties, a plastic bag
tie or a scrap piece of hook-up wire to hold down this group of
wires temporarily. A convenient point is to loop your tie through
one of the PC board mounting holes near U10.
Assm. 20
FX-440 -