Chapter 77-26F-7-367.8.1.2 Controlling the Output to Suit the Environment 0010-8069iR7105 / iR7095 / iR7086The transfer guide bias is optimized to suit the environment (identified with reference to the data from the environment sensor).F-7-37SERVICE MODE:- COPIER> OPTION> BODY> TRNSG-SW (transfer guide bias control mode switchover)0: switches to +200 V in a high-humidity environment (default)1: fix the transfer guide bias to +600 V2: fix the transfer guide bias to +200 V3: switches to +200 V in a normal humidity condition4: switches to +200 V in a low humidity conditionSet it to '2' through '4' if a transfer fault is noted.7.8.2 Transfer Charging Mechanism7.8.2.1 Outline 0010-8070iR7105 / iR7095 / iR7086DC controller PCBHigh-voltage DC PCBJ510ADC 600V/200VJ7233456789101112131415161718 123456789101112131415160 V24 VH24 VHHVDC_REMOTEFEEDER_GUIDE_ONWhen '1', high-voltageoutput is ready.When '1', the transferguide bias goes on.GNDGND1 2 3 4Relay PCBTransfer guideJ73323FEEDER_GUIDE_CNTR"1": +200V"0": +600V21J72117181Transfer guide biasPaper passing+600+200Paper being fed+600+600Normal/low humidityHigh humidityA bias of the same polarity as the toner isapplied in sync with the rotation of thephotosensitive drum.The photosensitive drum is rotating;yet, paper is not being fed.Normally, +600 V is applied to preventadhesion of toner to the transfer guide.In a high humidity environment, paper tends to absorb moisture(lower resistance), charging the paper in excess to affect transfer(faulty transfer); as such, the output is decreased.
