Konica Minolta bizhub 4020 Service Manual page 183

Error code Description
334.57 ACM motor no first encoder
334.58 ACM motor stop error
334.59 ACM PWM underflow (motor overspeed)
335.60 Hardware error—Board ID unknown
335.61 Hardware error—Option type unknown
335.62 Hardware error—Product ID unknown
335.63 Hardware error—Sensors are not plugged on
the board.
341.51 ACM motor no first encoder
341.52 ACM motor stop error
341.53 ACM motor PWM underflow (motor overspeed)
342.54 Separator/pass-through motor no first encoder
342.55 Separator/pass-through motor stop error
342.56 Separator/pass-through motor PWM underflow
(motor overspeed)
344.57 ACM motor no first encoder
344.58 ACM motor stop error
344.59 ACM motor PWM underflow (motor overspeed)
Option tray pick/lift section service check
Action
Step 1
1. Remove the option tray insert.
2. Check the lift plate and gears for proper
operation by moving the metal plate.
Do the lift plate and gears move freely, and are
they free of wear or damage?
bizhub 4020/3320 Service Manual
Yes
Go to step 2.
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Action
Go to Option tray ACM motor service
Go to Option tray controller board service
check.
Go to Option tray pick/lift motor service
Go to Option tray separator/Pass-through motor
service check.
Go to Option tray ACM motor service
No
Replace the tray insert.
check.
check.
check.