[SOLVED] Quick fix Konica-Minolta 7521 list error codes

[SOLVED] Quick fix Konica-Minolta 7521 list error codes

– Compatible Printer model: Konica-Minolta bizhub 7521
– Konica-Minolta bizhub 7521 Error Codes with quick guides:

• Code: C0000
• Description: Main Motor malfunction
  • The Main Motor (M1) Lock signal remains HIGH for a continuous 1-sec. period at any time 1 sec. after the Main Motor has started turning.
• Troubleshooting Guides: 1 Check M1 connectors for proper connection and correct as necessary. 2 Check M1 for correct drive coupling and correct as necessary. 3 M1 operation check. 4 Change PWB-A. 5 Change PU1.

• Code: C0044
• Description: ADF Cooling Fan Failure (Only when the optional DF is mounted)
  • The ADF Fan Motor Lock signal remains set to H for a set period of time while the EDH Fan Motor is turning.
• Troubleshooting Guides: 1 Check the motor connectors for paper connection, and correct as necessary. 2 Check the fan for possible overload, and correct as necessary. 3 M3-ADF operation check. 4 Replace PBA-CONT.

• Code: C0045
• Description: Fusing Cooling Fan Motor malfunction
  – The Fusing Cooling Fan Motor (M3) Lock signal remains HIGH for a continuous 1-sec. period while the Fusing Cooling Fan Motor is turning at full speed or decelerated speed.
• Troubleshooting Guides: 1 Check M3 connectors for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 M3 operation check 4 Change PWB-A. 5 Change PU1.

• Code: C004E
• Description: Power Supply Cooling Fan Motor malfunction
  – The Power Supply Cooling Fan Motor (M4) Lock signal remains HIGH for a continuous 1-sec. period while the Power Supply Cooling Fan Motor Remote signal remains ON (for full-speed rotation) or OFF (for decelerated-speed rotation).
• Troubleshooting Guides: 1 Check M4 connectors for proper connection and correct as necessary. 2 Check the fan for possible overload and correct as necessary. 3 M4 operation check 4 Change PWB-A. 5 Change PU1.

• Code: C0070
• Description: Toner Replenishing Motor malfunction
  – The Toner Bottle Home Position Sensor (PC7) outputs a HIGH signal for a continuous 3.5-sec. period while the Toner Bottle is turning.
  – The Toner Bottle Home Position Sensor (PC7) outputs a LOW signal for a continuous 2-sec. period while the Toner Bottle is turning.
• Troubleshooting Guides: 1 Check M6 connectors for proper connection and correct as necessary. 2 Check M6 for correct drive coupling and correct as necessary. 3 M6 operation check 4 PC7 sensor check 5 Change PWB-A. 6 Change PU1.

• Code: C0210
• Description: Abnormal image transfer voltage
  – The image transfer voltage remains more than 100 V continuously for a given period of time while the PC Drum remains stationary.
• Troubleshooting Guides: 1 Check the Image Transfer Roller for installation. 2 Change HV1. 3 Change PWB-A.

• Code: C03FF
• Description: Faulty Model Setting
  – “Model Setting” of “Adjust” available from the Service mode is incorrectly set.
• Troubleshooting Guides:

• Code: C0500
• Description: Warm-up failure
  – The surface temperature of the Fusing Roller does not reach a given level even after the lapse of a given period of time during a warm-up cycle.
• Troubleshooting Guides: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0501
• Description: Warm-up failure 2 (for the model having two Fusing Roller Heater Lamps)
  – The Fusing Roller Sub Thermistor does not detect a predetermined temperature within 30 sec. after a warm-up cycle has been started and thus the warm-up cycle is not completed.
  – The surface temperature of the Fusing Roller does not reach a given level even after the lapse of a given period of time during a warm-up cycle.
• Troubleshooting Guides: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0510
• Description: Fusing failure (abnormally low fusing temperature)
  – The temperature detected by the Fusing Roller Thermistor remains lower than 120°C (105°C for the model having two Fusing Roller Heater Lamps) for a given period of time during the standby state.
  – The temperature detected by the Fusing Roller Thermistor remains lower than 120°C (105°C for the model having two Fusing Roller Heater Lamps) for a given period of time during a print cycle.
• Troubleshooting Guides: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0511
• Description: Fusing failure (abnormally low fusing temperature 2)
  – The temperature detected by the Fusing Roller Sub Thermistor remains lower than 105°C for a given period of time during the standby state.
  – The temperature detected by the Fusing Roller Sub Thermistor remains lower than 105°C for a given period of time during a print cycle.
• Troubleshooting Guides: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0520
• Description: Fusing failure (abnormally high fusing temperature 2)
  – The temperature detected by the Fusing Roller Thermistor remains higher than 240°C for a given period of time.
• Troubleshooting Guides: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0521
• Description: Fusing failure (abnormally high fusing temperature 2)
  – The temperature detected by the Fusing Roller Sub Thermistor remains higher than 240°C for a given period of time.
• Troubleshooting Guides: 1 Check that the Fusing Roller Heater Lamp (H1) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 2 Check that the Fusing Roller Sub Heater Lamp (H2) turns ON when the Power Switch is turned ON and correct or replace the lamp as necessary. 3 Check the Fusing Roller Thermostat (TS1) for operation. <Check procedure> Check the resistance of TS1. TS1 is open-circuited if its resistance is infinity. 4 Check the Fusing Unit Interlock Switch (S2) for operation. <Check procedure> Check continuity across the following terminals when S2 is ON. • Across S2-1A and S2-1B • Across S2-2A and S2-2B 5 Check the Fusing Roller Thermistor (TH1) and Fusing Roller Sub Thermistor (TH2) for installation and correct or clean as necessary. 6 Check the Fusing Roller Thermistor (TH1) for operation. <Check procedure> Disconnect CN15 (4P) and check the resistance across CN15-2 and 3 on the Thermistor side. TH1 is open-circuited if the resistance is infinity. 7 Check the Fusing Roller Sub Thermistor (TH2) for operation. <Check procedure> Disconnect CN22 (4P) and check the resistance across CN22-2 and 3 on the Thermistor side. TH2 is open-circuited if the resistance is infinity. 8 Check the Fusing Roller Heater Lamp (H1) for continuity and correct or replace as necessary. 9 Check the Fusing Roller Sub Heater Lamp (H2) for continuity and correct or replace as necessary. 10 Change PU1. 11 Change PWB-A.

• Code: C0650
• Description: Faulty Scanner Home Position Sensor
  – The Scanner Home Position Sensor (PC10) does not go from HIGH to LOW when the Scanner Motor (M5) is energized for a given number of steps after the sequence to bring the Scanner back to its home position has been started at the end of a scan motion and during re-shading.
  – The Scanner Home Position Sensor (PC10) does not go from LOW to HIGH when the Scanner Motor (M5) is energized for a given number of steps after a scan motion has been started at the end of a Scanner Home Position Sensor home check scan motion and during re-shading.
• Troubleshooting Guides: 1 Check M5 connectors for proper connection and correct as necessary. 2 Check M5 for correct drive coupling and correct as necessary. 3 M5 operation check 4 Scanner operation check 5 PC10 sensor check 6 Change PWB-C/C.

• Code: C0B60
• Description: Bin Switching Motor malfunction (Only when the optional JS is mounted)
  – Refer to the option service manual (JS-503) for details.
• Troubleshooting Guides:

• Code: C0B80
• Description: Shift Motor malfunction (Only when the optional SF is mounted)
  – Refer to the option service manual (SF-501) for details.
• Troubleshooting Guides:

• Code: C0F32
• Description: Faulty ATDC Sensor
  – The measurement taken by the ATDC Sensor (UN1) at a time 2.0 sec. after the Main Motor (M1) has started turning is less than 5% (greater than 4.63 V).
  – The measurement taken by the ATDC Sensor (UN1) at a time 2.0 sec. after the Main Motor (M1) has started turning is 19% or more (1.41 V or less).
• Troubleshooting Guides: 1 Check to see if developer is available. 2 Check the ATDC Sensor connectors for proper connection and correct as necessary. 3 Change UN1. 4 Run ?gATDC Auto Adjust. 5 Change PWB-A. 6 Change PU1.

• Code: C0F33
• Description: Improperly adjusted ATDC Sensor
  – The adjustment of the ATDC control voltage is not completed within 1 sec. after sampling has started of the ATDC Sensor (UN1) as part of an operation of ATDC Sensor Automatic Adjustment.
  – The ATDC Sensor control voltage falls outside the range of 5.39 V to 8.15 V during an operation of ATDC Sensor Automatic Adjustment.
• Troubleshooting Guides:

• Code: C1038
• Description: Engine connection failure
  Master Board (PWB-A) to Control Board (PWB-C/C) connection failure
  – There is no acknowledge signal transmitted from the Master Board (PWB-A) to Control Board (PWB-C/C) for 1.5 sec. or more.
  – An error command signal is transmitted from the Control Board (PWB-C/C) to Master Board (PWB-A).
  – An error status signal is transmitted from the Master Board (PWB-A) to Control Board (PWB-C/C).
• Troubleshooting Guides: 1 Turn OFF and ON the Power Switch. 2 Check the PWB-A connectors for proper connection and correct as necessary. 3 Check the PWB-C/C connectors for proper connection and correct as necessary. 4 Check for proper connection between PWB-A and PWB-C/C and correct as necessary. 5 Change PWB-A. 6 Change PWB-C/C.

• Code: C1200
• Description: Faulty ASIC/memory
  ASIC/memory (for image and control) fault
  A write or read error occurs with SRAM on the Control Board (PWB-C/C).
• Troubleshooting Guides: 1 Turn OFF and ON the Power Switch. 2 Check memory on PWB-C/C for connection and correct as necessary. 3 Change PWB-C/C.

• Code: C1300
• Description: Polygon Motor malfunction
  -Startup failure
  – Lock signal fault: Unstable after the first Lock signal has been detected
  – Lock signal fault: Lock signal out-of-timing
• Troubleshooting Guides: 1 Turn OFF and ON the Power Switch. 2 Check for proper connection between the PH Unit and Master Board and correct as necessary. 3 Change the PH Unit. 4 Change PWB-A.

• Code: C133B
• Description: Communication with option error
  – It is not possible to communicate with the Printer Board within a predetermined period of time during a print cycle.
• Troubleshooting Guides:

• Code: C133D
• Description: ROM check error
  – An error is detected of the flash ROM chip on the Fax Board when the Power Switch is turned ON.
• Troubleshooting Guides:

• Code: C13F0
• Description: Faulty HSYNC
  Laser scanning system malfunction
  – The SOS Sensor does not detect a rising edge of SOS within a given period of time after the Polygon Motor (M2) has started turning and a laser output has been started.
  – The SOS Sensor detects no rising edges of SOS while VIA (image area control) is ON.
• Troubleshooting Guides: 1 Turn OFF and ON the Power Switch. 2 Check for proper connection between the PH Unit and Master Board and correct as necessary. 3 Change the PH Unit. 4 Change PWB-A.

• Code: C1468
• Description: Faulty Parameter Chip
  Parameter Chip fault
  – Data cannot be written in Parameter Chip.
  – Data stored in Parameter Chip is wrong.
• Troubleshooting Guides: 1 Turn OFF the Power Switch and unplug the power cord. Then, plug in the power cord and turn ON the Power Switch again. 2 Check Parameter Chip (U16) on PWB-C/C for proper connection and correct as necessary. 3 Change PWB-A. 4 Change Parameter Chip.

• Code: C14A3
• Description: IR fluorescent lamp fault
  The Exposure Lamp (LA2) of the Scanner fails to turn ON.
  – The intensity of the Exposure Lamp is a predetermined value or less during shading and re-shading.
• Troubleshooting Guides: 1 Check that the Exposure Lamp (LA2) turns ON when the Power Switch is turned ON and correct or replace as necessary. 2 Check connectors on PU2 for proper connection and correct as necessary. 3 Check connectors on PWB-J for proper connection and correct as necessary. 4 Change PWB-C/C.

• Code: C3FFF
• Description: Flash ROM error
• Troubleshooting Guides:

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