Brother International HL-2600CN Service Manual - Page 302

Chart 8-4 Troubleshooting Code C3 Description of Error Cause of Error NVRAM Error 1. Failure of MCTL PWB 2. CPU EEPROM Clearance Method 1. Turn on and off the power switch. 2. Above method 1 does not work, implement "C3 Error Clearance Procedure". 3. Replace the failed MCTL PWB 2 with a new MCTL PWB 2. C3 Does the error repeat despite of implementing "On/Off of Power Switch" ? NO YES Does the error repeat despite of implementing "NVRAM INITIAL" ? NO YES Replace the failed MCTL PWB 2 with a new MCTL PWB 2. Continue to drive the engine. Continue to drive the engine. Code Description of Error Cause of Error C4 Hard Error of MCTL Control Circuit. 1. Failure of MCTL PWB 2. Clearance Method 1. Turn on and off the power switch. 2. Replace the failed MCTL PWB 2 with a new MCTL PWB 2. C4 Does the error repeat despite of implementing "On/Off of Power Switch" ? NO YES Replace the failed MCTL PWB 2 with a new MCTL PWB 2. Continue to drive the engine.