Error 142 fatal for printer OKI C9300

Fatal error code 173:
This error indicates that the Image Drum Up/Down Process is not working properly. The errors are as follows:
140 - Yellow Drum Up/Down error
141 - Magenta Drum Up/Down error
142 - Cyan Drum Up/Down error
Solution:
1. Reseat the Image Drums. Ensure they are in seating properly into the drum carriage.
2. Reseat the Toner Cartridges. Ensure they are seating properly into the Image Drums.
3. Reseat the Contact Sensor Spring assembly and inspect it for damage or mis-alignment. If the springs appear bent or dis-lodged reseat them.

Color ID up/down error
is detected.
1) Is an Error message displayed?
Confirm that the Y, M, and C ID
units are in position, and reboot

Here's a place to start: http://www.oki.co.uk/support/printer/troubleshooting/detail.aspx?id=tcm:122-98675-16&prodid=tcm:122-2888

check mechanical error on your printer by sending it to the actual technician..

First of all unplug the printer from the mains (safety first). Get the toner out again and check for dirt on the contacts. Also check the contacts inside the printer itself.

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direct FixYa link: http://www.fixya.com/users/technical114

Abnormal temperature
detected by
fuser thermistor
(high-temp or low
temp.)

Turn power ON again.
Replace fuser unit.

Page 173 on http://www.printelogy.net/Oki%20Manuals/C5500-C5800-C6100_Service%20Manual.pdf, Reset ID unit.

unplug the unit then clean the printer and all drum units and etc with compressed air. Replace the drums and replug should solve the problem.

Error 020 is a ROM dimm error, could be as simple as reseating/replacing Rom Dimm or a expensive main PCB, you need to get hold of a oki dealer, contact oki to find closest OKI repair agent.
www.oki.com

the problem is on the fuser unit, ther thermistor on it is damaged.