OKI C834dnw
Troubleshooting. Paper feed jam (Error 391: 1st Tray) 2
Jam occurs immediately after the paper feed is started. (1st tray)
Check condition of the paper path
Check item | Check work | Actions to be taken at NG |
---|---|---|
Paper path of the front unit | Check if paper is jammed or not in the paper path. | Remove the jammed paper. |
Check condition of the mechanical parts
Check item | Check work | Actions to be taken at NG |
---|---|---|
Check the sensor levers of the paper IN1 sensor and the paper IN2 sensor. | Check if shape and movement of the sensor levers have any abnormality or not. | Replace the sensor with the normal sensor lever. |
Check the feed roller, pickup roller and the retard roller assembly of the tray. | Check if any foreign materials such as paper dust on the surface of the feed roller or of the pickup roller or not. | Remove the foreign material. |
Check if the feed roller or the pickup roller has worn out or not. | Replace the feed roller, the pickup roller and the retard roller assembly of the tray. |
Motor driving check
Check item | Check work | Actions to be taken at NG |
---|---|---|
Paper Hopping motor | Confirm that the paper hopping motor works normally by using the [Motor & Clutch Test] of the self-diagnostic mode. | Replace the CU/ PU board or the paper hopping motor. |
Paper Hopping motor driver | Remove the MOTERCL connector 1 of the CU/PU 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. |
Replace the CU/ PU board. |
Check the system connection
Check item | Check work | Actions to be taken at NG |
---|---|---|
Paper Hopping motor drive cable | Check the connection condition of the cable. Check if the connector is connected in the halfway 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. |
Replace the cable with the normal cable that normalizes the connection condition. |
Paper Hopping motor drive cable | Check that any cable is not pinched during assembling of the apparatus. Remove the MOTERCL connector 1 of the CU/PU board and check the following at the connector 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 |
Replace the cable with the normal cable that normalizes the connection condition. |
Paper Hopping motor | Remove the MOTERCL connector 1 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 connector side. | Replace the paper hopping motor. |
Clutch driving check
Check item | Check work | Actions to be taken at NG |
---|---|---|
Paper feed clutch, registration clutch | Check to make sure that the paper feed 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 | Replace the CU/ PU board, or replace the paper feed clutch or the registration clutch. |
Check the system connection
Check item | Check work | Actions to be taken at NG |
---|---|---|
Clutch cable of paper hopping | Check the connection condition of the cable. Check if the connector is connected in the halfway 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. |
Replace the cable with the normal cable that normalizes the connection condition. |
Paper Hopping clutch | Check that any cable is not pinched during assembling of the printer. Remove the HOPLC connector 2 of the CU/PU board and check the following at the cable side. Short circuit between pin-1 – FG Remove the HOPCL connector 2 of the CU/ PU board and check that approx. 240Ω can be measured between pin-1 and pin-2. |
Replace the clutch and assembly it again correctly. |