Koss Cordless Telephone JR 900 User Manual

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Congratulations on your choice of the Koss JR/900 Cordless RF Stereophone System. Now you can enjoy the  
Sound of Koss anywhere in your home- even outdooors-without the cord. The Koss JR/900 RF System  
Includes:  
1. KossJR/900S Stereophones (1)  
2. Koss JR/900T Transmitter (1)  
3. Koss JR/900A Adapter (1)  
4. 3.5 mm male stereo plug to dual RCA stereo plug connecting cord.  
5. DC male to DC male recharge cord  
6. Adapter plug  
7. 3.5mm Stereo Jack  
8. NICAD Battery Pack  
IMPORTANT INFORMATION. READ BEFORE USING!  
Located on the side of the transmitter is a charger output jack that is used to recharge the internal battery of  
the JR/900RF System  
The NICAD(nickel cadmium) battery pack of the JR/900 must be fully charged prior to operation. An initial  
charge of 24 hours is required to ensure the extended life of the NICAD battery pack. Be sure the  
stereophone is in the "OFF" position. (SEE "To recharge the NICAD battery pack")  
JR/900 OPERATING CONTROLS  
Volume Control  
Controls the level of the audio signal input to the transmitter. Adjust for the highest non-distorted level as  
heard through the JR/900S stereophones.  
ON/OFF Switch  
Place this switch in the ON position when using the stereophones. The ON indicator will be red. Place this  
switch in the OFF position when you are charging the battery or when the stereophones are not in use NOTE:  
When the ON/OFF switch is in the ON position, the on indicator light will light even when recharging is  
necessary.  
Red LED/ Green LED  
Red indicates the transmitter is operating. Green indicates the transmitter is charging when connected to  
stereophones.  
Recharge Jack  
The charger cable plugs into the transmitter at the charger input jack and the stereophones' charger cable  
input jack. This connection is made only when recharging the battery pack ( SEE " To recharge the NICAD  
battery pack")  
Left/ Right RCA input Jack  
Use dual RCA connecting cord (#4) to connect transmitter to the audio output.  
AC Input  
Connects 24VDC, 150mA ac adapter to transmitter.  
Channel Selector  
The channel selector is pre-set at the factory. If you encounter interference the channel selector can be re-set  
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listening life of approximately 10 hours. The NICAD battery pack must be fully charged 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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cause interference to radio or television reception, which you can determine by monitoring reception when  
the JR/900 Stereophone System is installed and when it is removed from the sound system, try to correct the  
problem with one or more of the following measures:  
*Reorient the receiving antenna.  
*Relocate the signal source with respect to the receiver.  
*Relocate the signal source and/or the receiver so that they are on separate branch circuits.  
If necessary, consult your dealer or an experienced radio/television technician for additional suggestions. You  
may find the following booklet, prepared by the Federal Communications Commissions, helpful:  
How to Identify and Resolve Radio-TV Interference Problems  
Stock No. 004-000-0345-4  
U. S. Government Printing Office  
Washington, DC 20402  
In accordance with Part 15, Section .21 of FCC rules, the user is cautioned that any changes or modifications  
to the equipment described in this manual that are not expressly approved by Koss Corporation could void the  
user's authority to operate the equipment.  
The user is also cautioned, in accordance with Part 15, Section .27 of FCC rules, that any peripheral device  
installed with this equipment, such as a modem or printer, must be connected with a high-quality shielded  
cable to insure compliance with FCC limits.  
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