JCM Part No . 960 - 000076R _ Rev . 1 © 2007, JCM - American Corporation 6 - 6 Section 6 World Bill Acceptor (WBA® - 1x/2x - SS & SS2) Calibration and Testing Acceptor Head . To end the calibration procedure, press the Escape X key . Calibration Error Messages When an error occurs during a normal adjustment sequence, the Figure 6 - 25 screen will appear containing the following message types on the screen instead of displaying the normal adjustment message previously discussed: •   xxxxx Communication Error xxxxx: Communication with WBA has failed . => Check all the connections . Make sure you have executed the correct calibration program . •   xxxxx Adjustment Error (Gain) xxxxx: Gain calibration error . => Make sure you have correctly inserted White Calibration Paper as instructed by the monitor . •   xxxxx Adjustment Error (Black Level) xxxxx: Black level calibration error . => Make sure you have correctly inserted Black Calibration Paper as instructed by the monitor . •   xxxxx Adjustment Error (No paper) xxxxx: No paper level calibration error . => Make sure you have removed all calibration paper . •   xxxxx Adjustment Error (MAG) xxxxx: Magnetic head calibration error . => Make sure you have correctly inserted a MAG Head Test Board into the Validator as instructed by the monitor . When calibration error occurs, the sensor signal name and the signal value involved in the error will be displayed on the line below the “The gain of the following sensors is not in ascending order” mes - sage . Figure 6 - 25 displays an example of a typical error message . Sensor Signal and Name Conversions Table 6 - 1 lists the Sensor Signal Name vs . its Sen - sor Name comparisons for the WBA - 1X - SS Vali - dator, and Table 6 - 2 lists the Sensor Signal Name verses its Sensor Name comparisons for the WBA - 2x-SS Validator .   Flash Memory Download Procedure This section describes how to download a software program to the Flash EPROM on the CPU Board . When To Download Download new software whenever the following conditions occur: •   When a Software Upgrade is required •   After a CPU Board has been replaced . Refer to “Forced Download Mode” on page 9 of Appendix A for further downloading information and procedures . Figure 6 - 25 Typical Error Message Screen Table 6 - 1   WBA - 1X - SS Validator Sensor Names Signal Name Sensor Name C2l HPC, LEC R2I HPR, LER L2I HPL, LEL C2R HPC, LEC R2R HPR, LER L2R HPL, LEL A PT1, LE1 B PT2, LE2 BUR HBAR CDR HPC RDR HPR LDR HPL Table 6 - 2   WBA - 2X - SS Validator Sensor Names Signal Name Sensor Name C2I, C2R UHPC, DHPC CUI, CUR UHPC CDI, CDR DHPC R2I, R2R UHPR, DHPR RUI, RUR UHPR RDI, RDR DHPR L2I, L2R UHPL, DHPL R2E PT1 L2E PT2 R2A PT3 L2A PT4 BUR HBAR