Tele Center   Billing Machine not switching on System working with Adaptor but not with Battery Print out is Faded Booth Display is showing wrong / illegible characters. Phone OFF hook / Dialing is not sensed Paper feeding function does not operate. I have set up the Billing machine Unit.   The machine works, but the booth displays “Serial Connection error”. I have changed the EPROM but the machine displays the previous rates. My Line1 works but Line 2 doesn’t work.  I have replaced the new EPROM & when I switched the Unit it is not getting ON.    Billing Machine not switching on Solution            Check the adaptor output.  It should be around 14.2 V.  If it is OK check the ‘DC Fuse’.  If   it is blown replace it with 2 A fast blown types. System working with Adaptor but not with Battery Solution            Check the adaptor output.  It should be around 14.2 V.  If it is OK check the ‘DC Fuse’.  If   it is blown replace it with 2 A fast blown types. Print out is Faded  Solution Replace the printer ribbon Booth Display is showing wrong / illegible characters. Solution Insert properly the RJ-45 cable to Booth Display as well as to the main Unit. Switch OFF and ON the machine once. Phone OFF hook / Dialing is not sensed Solution Check if the physical connections of exchange & telephone cable wires are correct and tight. Paper feeding function does not operate. Solution Check if any paper or ribbon jammed inside the printer assembly.  If possible remove them. Or call the Service Engineer for assistance. I have set up the Billing machine Unit. The machine works, but the booth displays “Serial Connection error”.          Solution Check the booth displays for proper connections. Always Display ‘J’ should be connected to BD1 and Display ‘R’ should be connected to BD2. I have changed the EPROM but the machine displays the previous rates. Solution Please Factory reset the machine for new settings to take effect. My Line1 works but Line 2 doesn’t work. Solution            Check for proper cabling form the device (ex. ATA, Innomedia etc) to the Billing Machine. Check for fuses in the lines L1 & L2. If blown replace it with 500 ma fuse-Fast blown type. I have replaced the new EPROM & when I switched the Unit it is not getting ON. Solution            Switch off the Unit. Open the Unit and check for proper Polarity & placement of the Chip. The cutting of the chip should map with that of the socket. If reversed    shorting happens & fuse blows. Check the Fuse & replace it.