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OKIPAGE 10ex LED Page Printer Troubleshooting Manual with Component Parts List ODA/OEL/INT 1999. 1. 18 Rev.1 40990901TH Rev.1 1 / 143 CONTENTS 1. OUTLINE... 3 2. TOOLS ...3 3. CIRCUIT DESCRIPTION ...4 4. TROUBLESHOOTING ...35 5. CIRCUIT DIAGRAM ...61 6. COMPONENT PARTS LIST ...96 40990901TH Rev.1 2/ 1. OUTLINE This manual has been written to provide guidance for troubleshooting of the OKIPAGE 10ex Printer (primarily for its printed circuit boards), based on the assumption that the reader has a thorough knowledge concerning the printer. Read the maintenance manual for this printer, if necessary. Notes: 1. The power supply board containing a high voltage power supply is dangerous. From the viewpoint of the safety standards, the local repairing of a defective board is not allowed. Thus, the objects to be locally repaired as a result of troubleshooting are switches and fuses. 2. Replacement of CPU (MHM2029) is not recommended. If CPU is found to be defective, board replacement is suggested. 2. TOOLS For troubleshooting the printer, the tools listed below may be needed in addition to general maintenance tools. Tool Remarks Extension cord kit P/N: 40581901 Oscilloscope Frequency response 100 MHz or higher Soldering iron A slender tip type, 15-20 watts 40990901TH Rev.1 3/ 3. CIRCUIT DESCRIPTION 3.1 Outline The main control board controls the reception of data transferred through a host I/F and processes command analysis, bit image development, raster buffer read. It also controls the engine and the operator panel. Its block diagram is shown in Fig. 3-1 . (1) Reception control The OKIPAGE 10ex Printer can be equipped with one I/F port by adding an RS232C I/F option board in addition to the Centronics I/F on th