• Code: E020-XX91
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  A computation result of patch reading in patch detection is 1008 or more.
• Remedy: Check on toner leak from toner buffer in the developing unit, Replace the patch image reading sensor

• Code: E020-XX92
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  A computation result of patch reading in patch detection is less than 42 for Y/M/ C and less than 73 for Bk 3 times in succession.
• Remedy: Check on attachment of the developing unit, Replace the patch image reading sensor, Replace the developing unit

• Code: E020-XX93
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  A computation result of patch reading in patch detection is 522 or more for Y/M/ C and 543 or more for Bk 3 times in succession.
• Remedy: Check on toner leak from toner buffer in the developing unit, Replace the patch image reading sensor

• Code: E020-XXA0
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  In ATR control, SGNL is less than 62.
• Remedy: Clean the ATR sensor window, Check on attachment of the developing unit, Check on a break in the ATR sensor, Replace the ATR sensor

• Code: E020-XXA1
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  In ATR control, REF is less than 62.
• Remedy: Check on a break in the ATR sensor, Replace the ATR sensor

• Code: E020-XXA2
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  In ATR control, SGNL is 960 or more.
• Remedy: Check on a break in the ATR sensor, Check on operation of the shutter, Replace the ATR sensor

• Code: E020-XXA2
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  In ATR control, SGNL is 960 or more.
• Remedy: Check on a break in the ATR sensor, Check on operation of the shutter, Replace the ATR sensor

• Code: E020-XXA3
• Description: Drum/Developer-related error XX=01:Y XX=02:M XX=03:C XX=04:K XX=00:Any color
  In ATR control, REF is 960 or more.
• Remedy: Check on a break in the ATR sensor, Replace the ATR sensor