Konica Minolta bizhub 4020 Service Manual page 77

Duplex service check
Action
Step 1
1. Remove the rear cover.
2. Check the redrive rollers for wear or damage.
Are they free of wear or damage?
Step 2
1. Remove the left cover. See
2. POR into the Diagnostics menu and navigate to:
DUPLEX TESTS >Duplex Feed 1
3. Check the reverse solenoid for proper operation.
Does it function properly?
Step 3
1. Remove the input tray.
2. From under the printer, check the duplex gear
assembly and duplex link for wear and damage.
Are they free of wear and damage?
Step 4
From under the printer, check the duplex, belt, and roller
for wear and damage.
Are they free of wear and damage?
Step 5
1. POR into the Diagnostics menu and navigate to:
DUPLEX TESTS >Sensor Test
2. Lower the jam access cover, and toggle the duplex
sensor.
Does the sensor state on the control panel change when
it is toggled?
Step 6
Does the error remain?
bizhub 4020/3320 Service Manual
Left cover removal.
- 76 -
Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Contact the next level of
support.
No
Replace the redrive
assembly. See Redrive
assembly removal.
Replace the reverse
solenoid. See Reverse
solenoid removal.
Replace the duplex gear
assembly. See Duplex
gear assembly removal.
Replace the duplex. See
Duplex removal.
Replace the duplex
sensor. See Duplex
sensor and input sensor
removal.
The problem is solved.