Oki MC873dn Maintenance Manual page 73

Oki Data CONFIDENTIAL
Check item
(3-1-2-3) Motor operation check
Hopping motor of Confirm that the hopping motor of the applicable
the applicable tray tray works normally by using the Motor & Clutch
Test of the self-diagnostic mode.
-Error code:391 Remove the MOTERCL connector of the CU/PU
Hopping motor driver board and check the following at the connector
side.
Several MΩ between pin-5 – FG.
Several MΩ between pin-6 – FG.
Several MΩ between pin-7 – FG.
Several MΩ between pin-8 – FG.
(3-1-2-4) Check the system connection of Tray1
Hopping motor drive Check the connection condition of the cable.
cable Check if the connector is connected in the half-
way only or not, and check if the connector is
inserted in a slanted angle or not. Check also that
cables are assembled without any abnormality.
Hopping motor drive Check that any cable is not pinched during
cable assembling of the printer.
Remove the MOTERCL connector of the CU/PU
board and check the following at the cable side.
Short circuit between pin-5 – FG
Short circuit between pin-6 – FG
Short circuit between pin-7 – FG
Short circuit between pin-8 – FG
Hopping motor Remove the MOTERCL connector of the CU/
PU board and check that approx. 3.4Ω can be
measured between pin-5 -pin-6 and pin-7 -pin-8
respectively at the cable end.
45850101TH Rev.1
Actions to be taken
Check work
at NG
Replace the CU/
PU board or the
2nd(3rd/4th)
Tray unit board
(Board-GOH-2)
or the hopping
motor.
Replace the CU/
PU board.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
hopping motor.
Check item
(3-1-2-5) Clutch operation check
-Error code:391 Check to make sure that the applicable clutch
Tray1 Hopping works normally by using the Motor & Clutch Test
Clutch of the self-diagnostic mode.
-Error code 392: Open the front cover so that the rollers can be
Tray2 Hopping seen to check.
Clutch,
Tray2 Feed Clutch.
-Error code 393:
Tray3 Hopping
Clutch,
Tray3 Feed Clutch
-Error code 394:
Tray4 Hopping
Clutch,
Tray4 Feed Clutch
(3-1-2-6) Check the system connection of Tray1
Clutch cable for Check the connection condition of the cable.
paper feed Check if the connector is connected in the half-
way only or not, and check if the connector
is inserted in a slanted angle or not. Check
also that cables are assembled without any
abnormality.
Cable for paper feed Check that any cable is not pinched during
clutch assembling of the printer.
Remove the HOPLC connector of the CU/PU
board and check the following at the cable side.
Short circuit between pin-1 – FG
Remove the HOPCL connector of the CU/
PU board and check that approx. 240Ω can be
measured between pin-1 and pin-2.
2. TROUBLESHOOTING PROCEDURES
Actions to be taken
Check work
at NG
Replace the CU/
PU board or the
2nd(3rd/4th)
Tray unit board
(Board-GOH-2)
or replace the
applicable
clutch.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
clutch and
assembly it
again correctly.
2-48