c421
Charging
Instructions
c421
features
smart
Li
‐
Ion
recharging
technology.
Typical
charge
time
is
3
‐
5
hours.
Minimal
user
intervention
is
required:
1.
Connect
provided
mini
‐
USB
cable
to
amplifier.
2.
Connect
opposite
end
of
cable
to
any
USB
source.
Charging
begins
immediately.
Amplifier
may
be
used
while
charging,
and
USB
cord
may
be
connected/disconnected
as
desired.
Due
to
USB
current
limits,
charge
duration
is
faster
when
c421
is
OFF.
Maximum
longevity
of
any
Li
‐
Ion
battery
is
achieved
by
minimizing
the
number
of
charge
cycles
and
avoiding
fully
charged
or
fully
drained
batteries.
LED
Indication
Power
Off
Battery
LED:
Off
Power
LED:
Off
Power
On,
Battery
Good
Battery
LED:
Off
Power
LED:
Green
Power
On,
Battery
Low
~45
min.
remaining
Battery
LED:
Red
Power
LED:
Green
Charging
Battery
LED:
Orange
Power
LED:
Blue
Charging
Complete
Battery
LED:
Off
Power
LED:
Blue
Battery
Error
Battery
LED:
Orange
Flashing.
Charge
could
not
complete
due
to
insufficient
power
or
missing
battery.
Operating
Environment
c421
is
a
high
‐
performance
headphone
amplifier.
Excessive
temperature
or
moisture
may
temporarily
impact
sound
quality:
Operating
Temperature
Range:
–40°C
to
85°C
Operating
Humidity
Range:
0
to
85%
Relative
Humidity
ATTENTION:
Battery
shall
only
be
replaced
with
equivalent
3.7V,
1200mAh
Li
‐
Ion
pack.
Misuse
of
the
battery
may
cause
fire
or
burns.
JDS
Labs,
Inc.
is
not
responsible
for
damages
caused
by
device
misuse,
or
failure
to
adhere
to
device
instructions.
FCC
Certifications
NOTE:
This
equipment
has
been
tested
and
found
to
comply
with
the
limits
for
a
Class
A
digital
device,
pursuant
to
part
15
of
the
FCC
Rules.
These
limits
are
designed
to
provide
reasonable
protection
against
harmful
interference
when
the
equipment
is
operated
in
a
commercial
environment.
This
equipment
generates,
uses,
and
can
radiate
radio
frequency
energy
and,
if
not
installed
and
used
in
accordance
with
the
instruction
manual,
may
cause
harmful
interference
to
radio
communications.
Operation
of
this
equipment
in
a
residential
area
is
likely
to
cause
harmful
interference
in
which
case
the
user
will
be
required
to
correct
the
interference
at
his
own
expense.
CE
Mark
Warning
This
equipment
complies
with
the
requirements
relating
to
electromagnetic
compatibility,
EN
55022
class
A
for
ITE,
the
essential
protection
requirement
of
Council
Directive
89/336/EEC
on
the
approximation
of
the
laws
of
the
Member
States
relating
to
electromagnetic
compatibility.
