Oki MC770 series Maintenance Manual - page 160

45376001TH  Rev.1 

159 /

Oki  Data  CONFIDENTIAL

7. Troubleshooting and repair procedure

System Spec.

Code

Category

Cause

Error details

Measure

E722

Error

ADF document 

jam

Regist paper sensor stuck jam/detection 

of out-of-spec oversized documents – 

Once the regist paper sensor becomes 

active, it does not become inactive 

when the fed document is transferred to 

the distance exceeding the maximum 

page size. (Simplex and Duplex) 

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E723

Error

ADF document 

jam

Detection of out-of-spec undersized 

documents – Once the regist paper 

sensor becomes active, it becomes 

inactive before the fed document is 

transferred by the distance equal to 

the minimum page size. (Simplex and 

Duplex) 

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E724

Error

ADF document 

jam

Scan sensor stuck jam – The scan 

sensor does not become inactive even 

when the fed document is transferred 

by 60mm after the regist paper sensor 

becomes inactive. (Simplex and 

Duplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E725

Error

ADF document 

jam

Detection of a too little space between 

documents – Before the document is 

transferred by 31mm after the regist 

paper sensor becomes inactive, the 

sensor becomes active. Detection of a 

too little space between the documents. 

(Simplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E726

Error

ADF document 

jam

Activation of the reverse paper sensor 

for the documents not to be reversed 

– Switching to the first separator is not 

carried out normally causing activation 

of the reverse paper sensor. (Simplex 

and Duplex) 

•฀The฀reverse฀paper฀sensor฀becomes฀

active in feeding of a simplex document. 

•฀The฀reverse฀paper฀sensor฀becomes฀

active between reversal to the back and 

activation of the regist paper sensor.

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E727

Error

ADF document 

jam

Activation of a sensor at an unintended 

timing – The scan sensor, regist paper 

sensor, hopping sensor or reverse 

paper sensor becomes active at 

an unintended timing. (Simplex and 

Duplex) 

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

7.5.3 Scanner error troubleshooting 

System Spec.

Code

Category

Cause

Error details

Measure

E711

Error

ADF document 

jam

Jam due to non-arrival at the hopping 

sensor – After paper feeding is started, 

the hopping sensor does not become 

active. (Simplex and Duplex) 

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E712

Error

ADF document 

jam

Jam due to non-arrival at the regist 

paper sensor – After feeding for a 

simplex document scan is started, the 

regist paper sensor does not become 

active. (Simplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E713

Error

ADF document 

jam

Jam due to non-arrival at the reverse 

paper sensor – After feeding for a 

duplex document scan is started, the 

reverse paper sensor does not become 

active. (Duplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E714

Error

ADF document 

jam

Jam due to document removal – In 

the middle of feeding for a simplex 

document scan, the document set 

sensor becomes inactive. (Simplex and 

Duplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E715

Error

ADF document 

jam

Activation of the hopping sensor at 

document reversal – The hopping 

sensor becomes active when the 

reverse paper sensor is inactive. Multi-

feed of documents is detected. (Duplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E778

Error

ADF document 

jam

Remaining document detection at 

power on – A sensor other than the 

document set sensor becomes active 

when the power is turned on or the 

cover is opened and closed during 

operation. 

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E779

Error

ADF document 

jam

Activation of only the document set 

sensor – Only the document set sensor 

becomes active at initialization of the 

ADF stopper gate. 

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover. 

E721

Error

ADF document 

jam

Jam due to non-arrival at the scan 

sensor – Although the fed document 

is transferred to a certain distance, the 

scan sensor does not become active. 

(Simplex and Duplex)

Open the ADF cover, 

remove every jammed 

document from the paper 

feed path, and close the 

ADF cover.