Toshiba e-STUDIO163 Service Handbook

Also see for e-STUDIO163: Specifications Operator's manual Service handbook Service handbook Service handbook

Contents

© December 2005 TOSHIBA TEC e-STUDIO163/203 ADJUSTMENT3 - 3733.6.2 Precautions[ 1 ] Developer biasNote for adjustmentAdjust the developer bias if fogging occurs over the entire image even though the main charger gridvoltage and toner density are appropriate. However, the following may occur if the developer bias islowered too much:• Image contrast becomes low.• Image is patchy or blurred.• The carrier in the developer material adheres to the photoconductive drum, causing scratchesaround the cleaner.[ 2 ] TransferItems to check before adjustmentBlotched image or poor transfer can be also caused by matters other than defective adjustment oftransfer output. Check the following items before adjusting the transfer charger. If there is no problem,adjust the output of the transfer charger.• Is the charger wire incorrectly installed or dirty? Is the transfer guide deformed?• Is the process unit properly installed? Is the developer magnetic brush in contact with the drum?Is the process unit worked correctly? Is the toner density low?• Is the copy paper fed straight? Is the copy paper abnormally moist?• Is the rotation of the registration roller normal?• Is the separation output different from the set value?• Is the developer bias value an appropriate one?• Are the transfer/separation charger case grounded? Is the high-voltage transformer grounded?Note for adjustmentWhen blotched image appear:• If blotched image appear in halftone areas, lower the transfer output value. Remember that transferperformance becomes low if the transfer output value is lowered too much.When poor transfer occurs:Increase the transfer output value under the following conditions. Remember that blotched imageappear if the transfer output value is increased too much.• Transfer is poor even though the charger wire is not dirty.• Thick paper has been frequently used.The adjustment code varies according to where blotched image and poor transfer occur. Select therequired adjustment code while referring to the following diagram.Fig. 3-23"220"Approx. 11mmAdjustment codeLeading edgearea of paperTrailing edgearea of paper"221" "222"Approx. 5mm