EasyManuals Logo

Sine Systems RFC-1/B Instruction Book

Default Icon
38 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #27 background imageLoading...
Page #27 background image
i
S
»
ft
ft
ft
ft
ft
ft
ftft
&
ft
ft
ft
ft
ft
ft
ft
ft'ft
ft"ft
A
&
&
&
*
/l\
WARNING!
Because
the
RFC-1
is
an
FCC
registered
device,
it
must
not
be
modified
in
any
way.
Any
components
which
are
replaced
must
be
replaced
with
ones
of
exactly
the
same
type
and
rating.
This
is
particularly
critical
in
the
circuitry
involving
connection
to
the
telephone
line.
Unless
repair
is
performed
by
a
properly
qualified
technician,
it
is
strongly
recommended
that
the
RFC-1
be
returned
to
Sine
Systems
for
repair
if
a
failure
has
occurred
in
this
area.
Your
safety
and
the
safety
of
others
could
depend
on
it!
Additional
useful
information
concerning
the
technical
operation
of
the
RFC-1
is
located
in
the
"Circuit
Description"
chapter
of
this
manual.
A
summary
of
troubleshooting
hints
is
included
after
the
following
general
service
information
on
the
RFC-1
and
RP-8
.
Fuse
Replacement
Later
versions
of
the
RFC-1
contain
no
conventional
fuses.
In
place
of
the
four
fuses
used
in
earlier
versions,
self-resetting
fuses
called
"Polyswitches"
are
used
instead.
They
protect
the
RFC-1
from
over-current
just
like
fuses,
but,
in
normal
use.
they
never
have
to
be
replaced.
In
some
cases,
in
order
to
reset
the
Polyswitches,
it
will
be
necessary
to
disconnect
the
12
volt
AC
power
supply
for
a
few
seconds.
Polyswitches
have
current
ratings
just
like
fuses
and
if
they
are
ever
replaced,
be
sure
and
replace
them
with
the
same
type
and
rating.
RF
Problems
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
There
have
been
very
few
reported
RF
problems
with
the
RFC-1
associated
with
FM
transmitters.
The
RFC-1
has
been
tested
and
found
to
operate
satisfactorily
in
AM
RF
fields
of
632
volts/meter
(the
ANSI
limit
for
human
exposure)
with
no
additional
external
filtering.
However,
extreme
conditions
have
been
documented
that
required
additional
external
filtering
to
obtain
reliable
operation.
In
one
such
case,
touching
an
exposed
conductor
of
the
telephone
line
produced
a
painful
shock
and
RF
bum.
Such
extreme
conditions
are
rare
but
even
these
problems
can
be
overcome
by
a
combination
of
one
or
more
of
the
following
remedies:
1)
Install
an
RF
filter
preceding
the
"LINE"
jack
near
the
RFC-1
2)
Install
an
RF
filter
preceding
the
TELEPHONE"
jack
near
the
RFC-1
3)
Loop
the
ribbon
cable
several
times
through
a
ferrite
core
near
the
RFC-1
and
another
near
the
relay
panels.
A
typical
telephone
line
RF
filter
is
made
by
Suttle
Apparatus,
P.O.
Box
28,
Lawrence,
IL,
62429.
Their
telephone
number
is
(618)
943-5721.
These
can
be
be
obtained
through
a
wholesale
distributor
of
telephone
products.
Be
sure
you
get
an
RF
filter
and
not
simply
a
telephone
spike
protector.
Ferrite
cores
suitable
for
ribbon
cable
are
available
from
Radio
Shack
(part
number
273-104).
Power
Supply
The
first
step
in
troubleshooting
should
be
to
look
for
signs
of
burned
or
otherwise
damaged
parts.
It
is
normal
for
U8,
U9
and
D6
to
run
fairly
warm
but
they
should
not
be
hot
enough
to
burn
or
discolor
the
PC
board.
Next,
check
the
incoming
AC
voltage
and
the
four
power
supply
voltages.
Note
that
the
"+10
volt"
supply
is
unregulated
and
may
be
anywhere
from
9
to
11.5
volts
DC.
3.01.1
Troubleshooting
and
Repair
page
7.3

Other manuals for Sine Systems RFC-1/B

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Sine Systems RFC-1/B and is the answer not in the manual?

Sine Systems RFC-1/B Specifications

General IconGeneral
BrandSine Systems
ModelRFC-1/B
CategoryRemote Control
LanguageEnglish

Related product manuals