Common Problems - OKIDATA OL400e Series Service Manual

4.4.03 Common Problems

A "TONER SNS" or "TONER LOW" message appears on a new printer.
Customers may experience a "TONER SNS" or "TONER LOW" message with a brand
new printer. This may occur even though a new toner cartridge and drum have been installed.
This can occur for the first 30 pages. Between 30 and 200 pages, the CPU will turn OFF the
toner sensor. This will eliminate the message on the LCD. After 200 pages, the printer will
begin checking for proper operation of the toner sensor flag.
Customers should use the printers for at least 30 pages. The "TONER SNS" or "TONER LOW"
messages do not cause any print quality problems. The unit is in NO danger of suffering any
damage. If the problem persists for more than thirty pages, customers are directed to contact
a service center for warranty repair.
This information is provided in Technical Service Bulletin 5604
The unit appears to be without power.
If the operator panel or the operator panel cable are not properly attached, the unit will appear
to be completely without power.
Symptoms include: no operator panel display, no power to the fan, no movement of the motors
or gears, and no lighting of the fuser lamp.
The symptoms usually occur after the upper cover of the printer has been removed and then
replaced (repairs, firmware upgrades, etc.).
The symptoms may also occur if the operator panel is dislodged by the end user.
The operator panel cable can be easily damaged during the removal and installation of the upper
cover. Dislodging, cutting, and/or crimping of the cable can occur if the technician does not follow
the disassembly procedure for the upper cover (Section 3 of this Service Handbook).
When diagnosing initialization failures, refer to RAP 1
This information is provided in Technical Service Bulletin 5605
The unit makes a tapping noise when the fan is running.
The noise is only apparent in quiet environments and does not exist on all OL4xxe printers.
To correct the problem, remove the small piece of foam located inside the upper cover of the
printer. The foam is glued to the cover, just behind the fan. Be careful not to damage the upper
cover when removing the foam.
Follow the disassembly procedure (Section 3 of this Service Handbook) for removing the
Service Manual for OL400e/OL410e/OL410e-PS
Chapter 4 Failure & Repair Analysis
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of this Service Handbook.
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