Brother International HL-3400CN Service Manual - Page 174

HL-3400CN SERVICE MANUAL CHAPTER 6 PERIODIC MAINTENANCE 1. GENERAL 1.1 Handling Precautions Since this high quality laser printer is a precision equipment, daily checking and periodic maintenance is indispensable to maintain the expected high performance. The following is the list of important precautions & action items for maintenance and periodic replacement parts: 1) Refrain from any operation, disassembly or modification that is not set out in this manual. 2) When assembling or disassembling the printer, turn off the power supply and unplug the power cable from the power outlet before commencing any work. 3) Whenever any parts are replaced, confirm that all the removed and replaced parts are re-installed correctly prior to testing the printer. 4) Read carefully and take note of any precaution or warning labels affixed to any parts. 5) Unless otherwise specified, follow exactly the reverse order of the disassembly procedures for re-assembly. Do not get the types of removed screws mixed up and check that the screw is the correct length. 6) Do no use any solvent for cleaning, both inside and outside the printer. 7) It is strictly forbidden to dump waste toner with flammable substances or throw it into a fire. This is a very important caution to respect. 6-3