• Code: E020-0081
• Description: ITB base light intensity lower limit error. When executing ITB base correction, the average value of P wave light intensity detected/calculated is less than 300.
• Remedy: When the value of DISPLAY > DENS >P-LED-DA is large (153(D) or more) and the value of DISPLAY > DENS >P-SENS-P is small, there is a high possibility that dirt is applied to the patch sensor. This occurs only at a regular timing. When the value of DISPLAY>DENS>DENS-S-x is small (2 digits), there is a high possibility that breaking occurred. 1. Clean the patch sensor. 2. Check the connection between the patch sensor and the DC controller interface PCB. (Connector, Shorting) Sensor side: J7412, J8035 PCB side: J1242 3. Check open/close operation of the patch shutter. 4. Check whether scratches/dirt are applied to the ITB. If many scratches are found, replace the ITB. If dirt is applied, clean the ITB. In this case, check the ITB cleaning blade at the same time. 5. Replace the patch sensor unit.

• Code: E020-0082
• Description: Patch sensor light intensity correction error. When executing correction of patch sensor light intensity, the P wave output is not more than 500 and less than 900.
• Remedy: When the value of DISPLAY > DENS >P-LED-DA is large (153(D) or more) and the value of DISPLAY > DENS >P-SENS-P is small, there is a high possibility that dirt is applied to the patch sensor. This occurs only at a regular timing. When the value of DISPLAY>DENS>DENS-S-x is small (2 digits), there is a high possibility that breaking occurred. 1. Clean the patch sensor. 2. Check the connection between the patch sensor and the DC controller interface PCB. (Connector, Shorting) Sensor side: J7412, J8035 PCB side: J1242 3. Check open/close operation of the patch shutter. 4. Check whether scratches/dirt are applied to the ITB. If many scratches are found, replace the ITB. If dirt is applied, clean the ITB. In this case, check the ITB cleaning blade at the same time. 5. Replace the patch sensor unit.

• Code: E020-0120
• Description: Initial installation toner density sensor (Y) output lower limit error. When executing the developing assembly initial installation mode (COPIER>FUNCTION>INSTALL>INI SET-Y), the output level does not reach 128 even when control voltage of the toner density sensor reached 255 or more.
• Remedy: 1. Check the connection between the toner density sensor and the DC controller interface PCB. (Connector, Breaking (Breaking (shorting))) <Y> sensor side: J7133, J8028, J8087 PCB side: J1240, J8085 <M> sensor side: J7134, J8029, J8088 PCB side: J1240, J8085 <C> sensor side: J7135, J8030, J8089 PCB side: J1240, J8086 <Bk> sensor side: J7146, J8015, J8117 PCB side: J1240, J8086 2. Check whether the toner density sensor is not disconnected or Breaking (Breaking (shorting)) occurs. 3. Replace the developing assembly.

• Code: E020-0124
• Description: Initial installation patch (Y) density lower limit error. When executing the developing assembly initial installation mode (COPIER>FUNCTION>INSTALL>INIS ET-Y), the ATR patch detection value (SigD) is less than 79.
• Remedy: When the value of DISPLAY > DENS >P-LED-DA is large (153(D) or more) and the value of DISPLAY > DENS >P-SENS-P is small, there is a high possibility that dirt is applied to the patch sensor. This occurs only at a regular timing. When the value of DISPLAY>DENS>DENS-S-x is small (2 digits), there is a high possibility that breaking occurred. 1. Check whether the developing assembly and the drum unit are properly installed. 2. Clean the patch sensor. 3. Check the connection between the patch sensor and the DC controller interface PCB. (Connector, Breaking (shorting)) Sensor side: J7412, J8035 PCB side: J1242 4. Check open/close operation of the patch shutter. 5. Clean or replace the ITB. Check whether the ITB belt is dirty or not. If it is dirty, perform cleaning with the following service mode. COPIER>FUNCTION>CLEANING>TBLT-CLN If it is assumed that this error occurred due to scratches on the ITB, replace the ITB. 6. Replace the patch sensor unit. 7. Replace the developing assembly.

• Code: E020-0130
• Description: Initial installation toner density sensor (Y) output upper limit error. When executing developing assembly initial installation mode (COPIER>FUNCTION>INSTALL>INISET-Y), the output level does not reach 128 even when control voltage of the toner density sensor became less than 55.
• Remedy: 1. Check the connection between the toner density sensor and the DC controller interface PCB. (Connector, Shorting) <Y> sensor side: J7133, J8028, J8087 PCB side: J1240, J8085 <M> sensor side: J7134, J8029, J8088 PCB side: J1240, J8085 <C> sensor side: J7135, J8030, J8089 PCB side: J1240, J8086 <Bk> sensor side: J7146, J8015, J8117 PCB side: J1240, J8086 2. Check whether disconnection or shorting of the toner density sensor occurs or not. 3. Replace the developing assembly.

• Code: E020-0134
• Description: Initial installation patch (Y) density upper limit error. When executing developing assembly initial installation mode (COPIER>FUNCTION>INSTALL>INISET-Y), the ATR patch output (SigD) is more than 970.
• Remedy: When the value of DISPLAY > DENS >P-LED-DA is large (153(D) or more) and the value of DISPLAY > DENS >P-SENS-P is small, there is a high possibility that dirt is applied to the patch sensor. This occurs only at a regular timing. When the value of DISPLAY>DENS>DENS-S-x is small (2 digits), there is a high possibility that breaking occurred. 1. Check whether the developing assembly and the drum unit are properly installed. 2. Clean the patch sensor. 3. Check the connection between the patch sensor and the DC controller interface PCB. (Connector, Shorting) Sensor side: J7412, J8035 PCB side: J1242 4. Check open/close operation of the patch shutter. 5. Clean or replace the ITB. Check whether the ITB belt is dirty or not. If it is dirty, perform cleaning with the following service mode. COPIER>FUNCTION>CLEANING>TBLT-CLN If it is assumed that this error occurred due to scratches on the ITB, replace the ITB. 6. Replace the patch sensor unit. 7. Replace the developing assembly.

• Code: E020-0136
• Description: Initial installation patch (Y) sampling error. When executing developing assembly initial installation mode (COPIER>FUNCTION>INSTALL>INISET-Y), the variation before average patch P wave light intensity is more than 100.
• Remedy: When the value of DISPLAY > DENS >P-LED-DA is large (153(D) or more) and the value of DISPLAY > DENS >P-SENS-P is small, there is a high possibility that dirt is applied to the patch sensor. This occurs only at a regular timing. When the value of DISPLAY>DENS>DENS-S-x is small (2 digits), there is a high possibility that breaking occurred. 1. Check whether the developing assembly and the drum unit are properly installed. 2. Clean the patch sensor. 3. Check the connection between the patch sensor and the DC controller interface PCB. (Connector, Shorting) Sensor side: J7412, J8035 PCB side: J1242 4. Check open/close operation of the patch shutter. 5. Clean or replace the ITB. Check whether the ITB belt is dirty or not. If it is dirty, perform cleaning with the following service mode. COPIER>FUNCTION>CLEANING>TBLT-CLN If it is assumed that this error occurred due to scratches on the ITB, replace the ITB. 6. Replace the patch sensor unit. 7. Replace the developing assembly.

• Code: E020-0190
• Description: Patch (Y) density lower limit error. The ATR patch detection output (SigD) is less than 79.
• Remedy: When the value of DISPLAY > DENS >P-LED-DA is large (153(D) or more) and the value of DISPLAY > DENS >P-SENS-P is small, there is a high possibility that dirt is applied to the patch sensor. This occurs only at a regular timing. When the value of DISPLAY>DENS>DENS-S-x is small (2 digits), there is a high possibility that breaking occurred. 1. Check whether the developing assembly and the drum unit are properly installed. 2. Clean the patch sensor. 3. Check the connection between the patch sensor and the DC controller interface PCB. (Connector, Shorting) Sensor side: J7412, J8035 PCB side: J1242 4. Check open/close operation of the patch shutter. 5. Check whether scratches/dirt are applied to the ITB. If many scratches are found, replace the ITB. If dirt is applied, clean the ITB. In this case, check the ITB cleaning blade at the same time. 6. Replace the patch sensor unit. MEMO: This error also occurs when there is not enough toner in the developing assembly. In this case, check the supplyrelated parts in the developing assembly.