USRobotics 5686G 56K Fax Modem USR5686G With RJ9 and RJ45 Cables 143598633017 but there is no signal

but there is no signal from channel 3 and 4

Manufacturer Tektronix Model Number P6330 SKU 19-33441 Ref 23-43701

Includes 3D Shutter Glasses

Includes Semi Fisheye Professional Lens as pictured

Manufacturer Sonance Model Number SUB 10-150 SKU 19-41354 Ref 23-55225

USRobotics 5686G 56K Fax Modem USR5686G With RJ9 and RJ45 Cables 143598633017 but there is no signalCondition Used Description This item is fully tested and in excellent working order. Item will come with a 30 Day Warranty. Cosmetically in good condition showing minor scuffs scratches blemishes from previous use. Includes Fax Modem, RJ9 and RJ45 Cables as pictured. No additional items or accessories are included. Photos are of the actual unit for sale. Inventory is on hand and ready to ship. Please feel free to message us with any questions you may