| CPC G03G 15/1605 (2013.01) | 7 Claims |
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1. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
a transfer belt onto which the toner image is primary transferred from said image bearing member;
a secondary transfer member configured to secondary-transfer the toner image from said transfer belt onto a recording material in a secondary transfer portion;
a voltage source configured to apply a transfer voltage to said secondary transfer member;
a current detecting portion configured to detect a current flowing from said voltage source through said secondary transfer member; and
a controller configured to control said voltage source,
wherein said controller is configured to execute an operation in a first mode in which, when the recording material is absent in the secondary transfer portion, a current flowing through said secondary transfer member under application of a voltage to said secondary transfer member is detected by said current detecting portion,
wherein said controller is configured to execute an operation in a second mode in which a test chart for adjusting the transfer voltage is printed, wherein the test chart includes a plurality of test images transferred from said transfer belt onto the recording material under application of a plurality of different test voltages to said secondary transfer member,
wherein the plurality of test images includes a first test image and a second test image adjacent to the first test image,
wherein the first test image is transferred by applying a first test voltage to said secondary transfer member and the second test image is transferred by applying a second test voltage to said secondary transfer member, and
wherein on the basis of the detected current during the operation in said first mode, said controller is configured to change a difference between the first test voltage and the second test voltage.
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