HOW TO REPLACE HVPS ON OPTRA T612

• Code: 314
• Description:AC charge output error [C]
  The machine detects the AC charge output for each color 0.3 V or less for 0.2 seconds after the machine has started to detect the AC charge output.
• Causes:• Loosen or broken harnesses to the HVPS: C/B • Not set or broken PCDU • Defective HVPS: C/B
• Remedy:1. Close the drum securing plate firmly. 2. Make sure that the PCDU terminal plate contacts the machine terminal plate closely at the front side. 3. Set correctly or replace the PCDU. 4. Replace the harnesses to the HVPS: C/B. 5. Replace the HVPS: C/B.

Quoting from internet site below:

http://printcopy.info/?l=en&mod=erc&brand=Ricoh&model=Aficio%20SPC430DN&page=3

SC491 on a Ricoh SP 210SU is a code for bias leak.

The machine detects that a bias leak has occured from the drum charge, development charge or transfer charge.
PWM signals are sampled at 20 msec. intervals. This SC is issued if 10 PWM samplings within 200 msec. are abnormal.

• HVPS (high voltage power supply) harness loose, broken, defective
• HVPS board defective
• AIO terminal defective (the terminal for the toner cartridge)
• Cycle the machine off/on
• Check all the harness connections of the HVPS
• Check spring-loaded AIO terminal installation behind the HVPS.
• Replace HVPS.

Usually this error is related to the cartridge. Some manufacturers of compatible cartridges will replace the cartridge with a new one.
At least they should give a discount based on how many pages that was printed before it failed.

I have not seen this problem with a new genuine Ricoh cartridge.
It is important that the cartridge is not refilled more then 3 times. There is no counter on this, and companies that refill cartridges they collect (with unknown number of cartridges) may have problems quite often.

SC491 Richo 2050

SC302 on a D029 (MPC2800) machine is due to Cyan A/C charge output error or a bias leak on HVPS. Could be a defective PCU or defective HVPS. Check charge connections to PCU, replace PCU and if this doesn't resolve issue, replace HVPS.

Please see the attached photo.

According to the service manual for problems with light print image, the cause can be the Developers or High Voltage Power Supply (HVPS). Other possible causes are given as: Developer roller is stained when the toner or developer cartridge is almost consumed. Ambient temperature is below 10 degrees Centigrade. Bad contacts with the HVPS or abnormal output from the HVPS. To replace the Developers you would need to purchase a replacement Imaging Kit CLP-R300A. Any problems in the HVPS would require a factory repair.

If printer doesn't work and it doesn't switch on, I assumed that there is no power at all on the printer. Check the AC line voltage if it is correct.

Unplug the printer. Remove the LVPS/HVPS, and check the fuses for continuity.

• If open, then replace the LVPS/HVPS.
• If not open, then check the switch continuity across its conductors with the switch on.
Turn the switch off. Plug the AC line into the LVPS/HVPS, and switch unit on.

Please try reseat power cable. If this does not resolve the issue, you may need to replace the LVPS (Low voltage power supply) on your printer.

For further assistance, please contact Lexmark Technical Support

Here's an article in the Lexmark website on How to Replace the Maintenance Kit Parts on an Optra T Laser Printer. Just click on this link: http://bit.ly/95cW2R. Scroll down for the instructions on how to replace the fuser unit. Hope this helps.

Make sure that the toner is not leaking and check your connections from the HVPS. If they look good I would replace the printhead.

Roger

Your transfer roller needs replacing.