• Code: F18-21
• Description: Tray 2
  PS8 (tray upper limit/2) does not turn ON within 20 seconds (Di551/Di650)/ 27 seconds (Di5510/Di7210)since the lifting motion triggered by activating M17 (tray up drive /2) has started while PS8 is turned OFF.
• Causes: M17 (tray up drive /2) PRCB (printer control board) PS8 (tray upper limit/2)

• Code: F18-30
• Description: Tray 3
  Error detection signal for M18 (tray up drive /3) is detected while M18 is turned ON.
• Causes: M18 (tray up drive /3) PRCB (printer control board) PS14 (tray upper limit/3)

• Code: F18-31
• Description: Tray 3
  PS14 (tray upper limit/3) does not turn ON within 20 seconds since the lifting motion triggered by activating M18 (tray up drive /3) has started while PS14 is turned OFF.
• Causes: M18 (tray up drive /3) PRCB (printer control board) PS14 (tray upper limit/3)

• Code: F18-40
• Description: Tray 4
  Error detection signal for M19 (tray up drive /4) is detected while M19 is turned ON.
• Causes: M19 (tray up drive /4) PRCB (printer control board) PS20 (tray upper limit/4)

• Code: F18-41
• Description: Tray 4
  PS20 (tray upper limit/4) does not turn ON within 20 seconds since the lifting motion triggered by activating M19 (tray up drive /4) has started while PS20 is turned OFF.
• Causes: M19 (tray up drive /4) PRCB (printer control board) PS20 (tray upper limit/4)

• Code: F18-50
• Description: LCT
  Error detection signal for M100 (LT up/ down) is detected continuously for one second while M100 is turned ON.
• Causes: M100 (LT up/down) LTDB (LT drive board) PS101 (LT lower limit detection) PS109 (LT upper limit detection)

• Code: F18-51
• Description: LCT
  PS109 (LT upper limit detection) or PS101 (LT lower limit detection) does not turn ON within 35 seconds since the lifting or descent motion triggered by activating M100 (LT up/down) has started while PS109 or PS101 is turned OFF.
• Causes: M100 (LT up/down) LTDB (LT drive board) PS101 (LT lower limit detection) PS109 (LT upper limit detection)

• Code: F18-60
• Description: By-pass feed
  PS34 (tray upper limit/BP) or PS35 (tray lower limit/BP) does not turn ON within 10 seconds since the upward or downward motion triggered by activating M20 (up/down/BP) has started while PS34 or PS35 is turned OFF.
• Causes: M20 (up/down/BP) PRCB (printer control board) PS34 (tray upper limit/BP) PS35 (tray lower limit/BP)