FOR OMNI 3740/3750 ONLY
1
This is usually due to the merchant record not having the correct check reader type that is actually connected to the terminal. If it is wrong change it to the correct one and update the merchant record. This will change the download file automatically and the terminal will need to be downloaded again.
2
If the equipment is correct then verify the cable is the right type HERE Verify that the rep swiped the config check if applicable. Note, for MAGTEK readers they can use either the OMNI3750 to MAGTEK or the LIPMAN for MAGTEK config check. MAke sure the light blinks 'GREEN' several times when the run the config.
3
If they are using a CR 1000 imager it may need to be reset. Use a paperclip or similar to press the reset button located on the back of the unit.

Make sure the cable is NOT plugged into the Pin PAd port on the terminal If they did then the terminal is probably toast. As a last resort you can try to force the terminal to see the reader by doing:
1. Turn the power off to the terminal and reader.
2. Turn the check reader on first and wait til all lights STOP flashing.
3. Turn the terminal back on. Proceed if it says SCANNER INIT FAILED.
4. Select GCHECK from the main menu.
5. Terminal will say scanner fail. Press ENTER
6. Press the purple button under 'MORE'
7. Press the button next to 'IMAGER'
8. Press the button next to 'CONFIG'

EDIT TERMINAL PARAMS BY HAND
This is used to change by hand the check reader type or setup, (SCANNER INIT FAILED)
To get there press F2 F4 enter password 1[alpha][alpha] 66831
Select EDIT on Menu
Select Group 6
Press Enter Until screen has up/down arrows
and says (KEY F2) and (VALUE F3) on right side of screen

Use the up/down arrow keys (purple buttons)to move from key item to key item
Since there are many KEY / VALUE pairs it is best to have the rep tell you what each 'KEY' item is as they use the up/down arrow keys to scroll through them. Once you find one that matches the list below make sure the 'VALUE' matches what it should be based on the check reader or imager connected.
You will press the F3 key to change the value in the terminal to match what it should be in the below table When you press F3 you can use the yellow backspace key to remove what is in the VALUE and replace with the correct value.
KEY F2VALUE F3What It Is
*ZTmerhant numberSerial number
*ZAGCKPAY (payroll)
GCKAPP (all others)		Terminal Application
*ZP16192582493Download Phone number
CDMDT0=none
1=CR600
2=CR1000
3=Magtek Mini
5=RDM5000
6=RDM6000
5=Ingenico Imgager
3=EN2500		MICR DEVICE TYPE
CDMCP1=port1 (always)
2=port2 (wrong)
1 always used		Specifies which com port reader connected to, always port 1
CDMCR1200=Magtek mini
9600=CR600
9600=RDM500/6000
19200=CR1000
9600=Ingenico Imager
1200=EN 2500		Check Reader/imager speed
CDMCF0=Magtek mini
0=CR600
0=En 2500
4=RDM 500/6000
4=CR1000
4=Ingenico Imager		Reader/Imager Comm Format

If it still says it failed and the equipment is correct and configured then either the terminal or check reader is bad.