Fixing Toshiba e-STUDIO 330AC Error Code C970
The C970 error code on the Toshiba e-STUDIO 330AC denotes a high-voltage leakage, typically pointing to dust build-up or physical damage in the main charge corona assembly.
Common causes
- 1Accumulated toner or paper dust on the corona wire.
- 2Broken or frayed charge corona wire.
- 3The corona wire cleaning tab left unparked.
- 4Failed High-Voltage Power Supply Board (HVPS).
Solutions
Technical Diagnostics for C970 Error
This code occurs when the High Voltage Transformer detects a sudden electrical drop or short circuit on the charger circuit.- Corona Wire Contamination: Fine toner dust can bridge the small gap between the high-voltage wire and the metallic grid shield, causing a continuous arc.
- Check the Cleaning Slider: Many charge assemblies have built-in manual cleaning tabs. If these are not fully returned to their park positions, they trigger an immediate short-circuit condition.
Steps to follow
- 1
Turn off power and open front door
Completely power down the printer using the main toggle switch. Open the front panel to view the drum units.
- 2
Locate and slide the corona cleaner
Find the cleaning slider knob (typically green or blue) on the drum assembly. Carefully pull it out and push it back in 3 to 4 times.
- 3
Confirm cleaner position
Ensure the cleaning knob click-locks back into its exact home/original position to prevent permanent print defects or electrical shorts.
- 4
Test run the machine
Close the panels, power up the printer, and check if the C970 error is cleared from the control screen.
Videos
Frequently asked questions
If simple cleaning doesn't clear the code, the corona wire may be snapped or the grid could be bent, requiring replacement of the charger assembly.
Yes, high humidity levels can lower dielectric resistance and increase the chance of electrical discharge/arcing across dusty corona components.