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listening life of approximately 10 hours. The NICAD battery pack must be fully char
g
ed prior to operation.
An initial charge of 24 hours is required to ensure the extended life of the NICAD battery pack. When
charging, be sure the stereophone is off. These batteries are located inside the stereophone and do not need to
be removed to be recharged. The red/green LED on the stereophone will extinguish when battery power is
low. The unit should be recharged at this time.
1. Both Stereophone and Transmitter should be turned off.
2. Plug the AC adapter into the wall outlet. Connect the AC adapter line out into the far left-hand input jack
on the rear of the JR/900 Transmitter.
3. Plug one end of the DC male power cord into the DC input jack labeled "Charge" on the side of the
transmitter.
4. Plug the remaining end of the DC male power cord into the DC input jack, marked "Recharge" on the right
earcup of the stereophone. The LED on the transmitter will glow green, indicating that the batteries are
charging.
5. To maintain battery life, drain the battery once a month by leaving the headphone in the "ON" position
until the light goes off, then recharge 14-16 hours. Replacement NICAD batteries can be ordered from Koss
Corporation. Dial 1-800-USA-KOSS.
NOTE:Overcharging will not damage your unit. Maximum battery life is achieved after the fourth charging
cycle(Cycle is each time the battery requires recharging.)
If you choose to replace your NICAD battery pack yourself, please dispose of the NICAD batteries properly.
Trouble Shooting Guide
No Sound
1. Check installation.
2. Check volume controls on audio source and JR/900 Stereophones.
3. Check that audio source and JR/900 system are switched on.
4. Check adapter.
5. Check that battery indicator light is growing.
6. Check all connections.
Distortion or Background Noise
1. Switch between channels on the transmitter to determine the clearest signal.
2. Check audio source.
3. Check that battery indicator light is glowing.
4. Adjust level control on transmitter.
For additional service problems, call 1-800-USA-KOSS
FCC ID:L76-JR900S,L76-JR900T
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:(1)
This device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Radio and Television Interference
This equipment generates and uses radio frequency energy and if not installed and used properly, in strict
accordance with the manufacturer's instructions, may cause interference to radio and television reception.
The JR/900 Stereophone System has been tested and found to comply with the specifications in Part 15 of the
FCC rules, which are designed to provide reasonable protection against such interference in a residential
installation.
However, there is no guarantee that interference will not occur in a particular installation. If this device does
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