4) Feed Jam (Error 380); Feed Jam (Error 380); Jam Occurs Immediately After The Power Is Turned On - Oki B721 Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(3-2-4) Check the system connection
Paper feed motor Check the connection condition of the cable.
drive 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.
(3-2-5) Clutch operation check
Paper feed clutch, Check to make sure that the paper feed clutch
registration clutch or registration clutch works normally by using
the Motor & Clutch Test of the self-diagnostic
mode.
Open the front cover so that the rollers can be
seen to check.
(3-2-6) Check the system connection
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 Check that any cable is not pinched during
feed clutch assembling of the printer.
Remove the HOPCLT connector
board and check the following at the cable side.
Short circuit between pin-1 – FG
Remove the HOPCLT connector
CU board and check that approx. 240Ω can be
measured between pin-1 and pin-2.
45487001TH Rev.1
Actions to be taken
Check work
at NG
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
PU/CU board,
or replace the
paper feed
solenoid.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
clutch and
of the PU/CU assembly it
again correctly.
of the PU/
6.5.2.(4)

Feed jam (Error 380)

(4-1)

Jam occurs immediately after the power is turned on.

Check item
(4-1-1) Check condition of the paper running path
Paper running path Open the front cover check if paper is not
of the front unit jammed in the paper running path.
(4-1-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the sensor
levers of the paper levers have any abnormality or not.
entrance sensor 1,
that of the paper
entrance sensor
2 and that of the
WR2 sensor.
(4-1-3) Check condition of electrical parts
Check the detection Confirm that the sensor signals are normally
condition of the detected by using the Maintenance Menu
sensor signal. SWITCH SCAN function.
Check the output Check for the following signals at the FSNS
signal levels of the connector
paper entrance Pin-4: Paper entrance sensor 1
sensor 1, that of Pin-3: Paper entrance sensor 2
the paper entrance WR2SNS connector
sensor 2 and that Pin-2:WR2 sensor
of the WR2 sensor. Confirm that the above signal levels change
when the sensor lever is operated.
Check the power Check the 5V power at the FSNS connector
voltages supplied of the front sensor board (HSC-2 PCB).
to the front sensor Pin-1: 5V power supply
board (HSC-2 Pin-5: 0VL
PCB)
6. Troubleshooting procedure
Actions to be taken
Check work
Remove the
jammed paper.
Replace the
sensor with the
good sensor
lever.
Replace either
the PU/CU
board or the
front sensor
board (HSC-
2 PCB) or
connection
cable.
Replace the
of the PU/CU board. front sensor
board (HSC-2
PCB)
Replace the
connection
cable.
at NG
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