Canon MP 700 Service Manual

Contents

4-6MultiPASS MP730/MP700 Chapter 4: Maintenance and ServiceDisplay TEST MODE bypressing button2-1 ADJ LEDTIME[1]- - -[3]2-1 ADJ LEDTIME[1]- - -[3]2-1 ADJ LEDTIME[1]- - -[3]FOR 300DPI CSTEST MODETEST MODEFOR 600DPI CSFOR 1200DPI CSSever seconds laterSever seconds laterSever seconds later2 12 11 2231Menu Copy #Set3. ADJUSTMENT3.1 CS LED Lights-on Duration Adjustmenta) OverviewThis adjustment is used to eliminate uneven scanning which can result from variations in lightintensity between individual LED’s. Performing the adjustment will therefore have an effecton scanned and copied images.The adjustment value is registered in an SRAM IC which has lithium battery back-up andwill not be lost even if power is turned off. However, the SRAM data can become damaged,for example by battery depletion. In this case, the machine checks the data’s validity the nexttime power is turned ON. If the data is invalid, the adjustment is made automatically.Because the user is automatically prompted, it is almost never necessary to perform thisadjustment during normal use. However, if the SPCNT board, Contact sensory ass’y, orlithium battery is replaced, be sure to perform this adjustment. Also, if the color or brightnessof scanned or copied images is faulty, performing this adjustment may correct the problem.b) Procedure(1) Check that the ADF or pressure plate is closed correctly, then perform the adjustment byfollowing the steps described below.Figure 4-2 CS LED Lights-on Duration Adjustment Operation(2) The adjustment procedure is finished when the display reads TEST MODE. To leavethe test mode, press the Stop/Reset key, and then ON/OFF key.