JDS Labs c421 v1.00 Operating Instructions - C421 Charging Instructions
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.