Internal Adjustments; Button Beeper Volume - Yaesu FT-990 Operating Manual

Station Installation Internal
Adj14strnents
Intemal Adjust1nents
Described below are a fi?w intema I settings you
may wish to make
as
you become familiar with the
FI-990. Access
to,
and adjustment of, all user-ad-
justable settings are described together here since
it is most convenient tO do all that you need at once
while the covers are removed. However, descrip-
tions of the purpose and effect of these adjust·
ments
are
provided elsewhere ir\ this manual,
where.
appropriate. We therefore recommend
thai
you do not make
any
o.f these adjustments until the
purpose and effect of each is dear to you.
All adjustments have been a ligned or set at the
factory to standard settings, but
in some cases
you
will want to tailor them for your particular station
requirements. Be careful, however, to avoid tam-
pering with other intermil co11trols n!Jt mentioned
in this section,
so
you don't degrade alignmen t.
For
full alignment details covering all internal set·
lings, ri!fer to the
Fr-990Techrrical
Ma11ua/.
CAUTION!
Some ef these
t;~djuslmer~ts
must
be made
zvilh power applied, and with
the
cover
re"
tfiQ.Ved.
A.lfli'attglt the
'I,!Oltagtts
a,t
e;\!{OSI!~
places. in the trrmsceiver are not danger-ous
to you., siilSitive-
cir-cuitn; attn
be
daiffnged
by
t;!)lltacf
wilh
rnetq1lic
tools.
Therefore~ve
rt!commend using .
(I
rronrmetallic
ndjus.t·
77llmt
tap/, if available. In an!! case, troaid
touchins,., any components not ir1valved in
tire
adjustment,
arttl-do nq.f
allow..
anything
to fill/ In the set while tire cover is removed.
Button Beeper Volttme
This trimme!' p>otentiometer sers the volume of
the beep that s.ounds when
one
of the front panel
buttons
is
pressed (independently
from
receiver
signal volume as set by the
AF
control).
0
Remove the ten screws shown at the upper
right, nnd remove the top cover.
0
Turn the transcehrer
0ll
1
and adjust the AF con·
trol for normal volume
on
backgrotmd noise
on
a~ comm<in.ly-used
band.
0 Referring to the photos
<~t
the right, locate
VR3011 and use a small screwdriver to adjust
lt
for the desired beep volume while repeately
pressil1g a butt(in.
- ..
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Top Cover Removal
Adjustment Points· Top
of
Chassis
..
~~10----------------------------------------------------
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