Whenr. posting error codes, it is best to indicate device, brand, model number. If this is a OKI laser printer, the error code 310 may be indicating a top cover is open. On a canon laser printer, the code 330 may indicate a need to replace or repair a power supply. Codes vary by brand. You might try googling the code plus the brand and possibly the model. "error code 310 brand model"
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