Patent ID: 8305623

Claim:
An image forming apparatus, comprising: a storage section that stores image data; a read out control section that repetitively reads out said image data from said storage section for a specified number of copies; an image forming section that forms images for the specified number of copies based on the image data read out by said read out control section; a counter that counts for each of the specified number of copies the number of pixels included in the read out image data at the time of reading out said image data by said read out control section; a first memory section that stores a count value for the n th copy counted by said counter at the time of reading out the image data of the n th copy (where n is an integer equal to 1 or more but less than the specified number of copies) by said read out control section; a second memory section that stores a count value for the (n+1) th copy and beyond of said counter at the time of reading out the image data of the (n+1) th copy and beyond by said read out control section; a comparison section that compares the count value for the n th copy stored in said first memory section and the count value for the (n+1) th copy stored in said second memory section when the writing operation for a predetermined number of pages of the (n+1) th copy has been completed; and, a control section that carries out error processing when there is an inequality in the comparison result in said comparison section, judging that an error has occurred in printing operation of the image forming apparatus.