UBI EasyCoder 501 – Service Manual19026. TROUBLE SHOOTING, cont'd.26.2Single Function Failure,cont'd.No memory backup storage• If setup values, programs, layouts, date and time, or the like whichare saved in RAM, turn out to be lost, the trouble could be adeficient battery backup. In this case the message “Setup lost”will appear on the display when the printer is switched on.• The minimum voltage of a sufficiently charged battery afterpower-off is 3.5V. The battery voltage must never drop below 3Vduring power-off at normal operating conditions.Turn on the printer and check that the battery is being charged.Voltage over R-324 should be 1–1.4V.• If the battery is not properly charged, the reason is often that thediode D-307 has been damaged, e.g. by RAM packages havingbeen fitted upside down. The damage will not reveal itself beforethe battery is empty and the memory is lost, which may takeweeks. If the diode is damaged, it must be replaced1. Refer tochapter 17.6:13 for circuits diagram.• When installing a printer, always recharge the internal battery byleaving the printer switched on for at least 24 hours.No communication (general)The following actions are valid for all communication interfacesinstalled in the printer. Refer also to trouble shooting of the interfacein question.• Check that the interface cable is correctly inserted and that it is ofcorrect type and configuration.• There are several ways to find out what parameters a certainprinter interface is set up for:If the printer is fitted with a UBI Shell startup program, there arevarious ways for printing or reading the setup, see the UBI ShellStandard or UBI Shell Enhanced manual.You could also enter the Setup Mode. Most standard startupprograms and the immediate mode of UBI Fingerprint allow youto make use of the < Setup > key, provided the printer has akeyboard.In case of EasyPak 501 printers and EasyCoder 501 printerswithout UBI Shell Standard, you may emulate an EasyCoder 501 Eby fitting a Service GAL and a Service Keyboard, see chapter25.1.Continued!1/. On CPU-board 1-040700-30 thesurface-mounted diode D-307 (BAR-45C SMD) can be replaced by 2 pcsSchottky diodes 1N5818 soldered tothrough-hole positions D-307A (imme-diately above the battery B-300) andD-307B (next to potentiometer WR-1), see chapter 17.5 and below.B300P201 C203R324D307AD307BD307D200WR1DISPReplacementDiode 1N5818ReplacementDiode 1N5818DamagedDiode D-307