4. Troubleshooting► Error CodeA1–2511A1–2512A1–2513► Error messageMotor Failure: #A1-2511. Turn off then on. Call for service if the problem persistsMotor Failure: #A1-2512. Turn off then on. Call for service if the problem persistsMotor Failure: #A1-2513. Turn off then on. Call for service if the problem persists► SymptomBlack OPC motor operation is abnormal.► Troubleshooting method• A1–2511 : Black OPC motor is stopped but machine recognizes it as operational.• A1–2512 : Black OPC motor is not operated for print-job.• A1–2513 : Black OPC motor is operating but machine recognizes status as "Stopped".1) Turn the machine off then on. If the error persists, turn the machine off again.2) Open the side cover. Check if there are any foreign substances or paper around black drum drive unit.3) Remove the rear cover after removing 10 screws.4) Check if the black OPC motor connector is connected correctly.5) If the connection is OK, turn the machine on. Enter SVC mode. Select the black OPC motor test.(Diagnostics > Engine Diagnostics > Engine Test Routines > 100–0044)4-75 Copyright© 1995-2013 SAMSUNG. All rights reserved.