Xerox ii LINXSolid Inkjet 100 Service Manual

Also see for Nuvera 100: System guide Getting started Install guide Software guide Planning guide

Contents

Xerox ii LINXSolid Inkjet 100 Service Manual Manual pdf 59 page image

General Information 1-59Power SupplyThe power supply has two main, yet interrelated sections: the ACsection and the DC section. In the AC section, power is routed to 14opto-isolated triacs which, under main board logic control, supply ACpower to the 14 heaters in the printer.Two fuses provide current protection to the triacs. Fuse F2 and F3protect the power supply from, most often, a shorted triac caused by adefective heater. If F2 or F3 fuse blows, it is best to replace the powersupply (and, of course, the defective heater), rather than the fuse.Otherwise, with the fuse replaced, but the triac shorted, AC powermay be applied to the heater without the printer even being turnedon. Each time the main board turns on a triac to activate a heater, itis turned on for only a fraction of a second. The main board mustconstantly readdress each heater it wants to remain on. By thismeans, if the print engine firmware should fail, the heatersautomatically shut off. The printer is also protected by thermal fuseslocated inside: two fuses for the drum heater, and one each for thepaper preheater and the cap/wipe/purge assembly. A thermal fuseopens in the unlikely event of a “runaway” heater following afirmware failure.The DC power supply generates +5 volts for the printer’s logic, + 40volts for the motors, +54 volts and -52 volts for the printhead drivers,and ±12 volts for fans. Fuse F1 provides protection for the switchingpower supply in the DC section. The block diagram for the powersupply is illustrated in Figure 1-26.WARNINGDo not touch the power supply; AC line voltages are present. Thepower-switch does not interrupt AC power to the power supply, itonly signals the supply and the printer logic to begin a shutdownsequence. Even with the power switch in the OFF position, AC linevoltages are present on the power supply, heaters and heaterwiring.There are no field adjustments necessary on the power supply.