| 摘要 |
PURPOSE:To correctly detect a failure of a printing head to always stably conduct high-quality printing. CONSTITUTION:In a dot printer comprising an open circuit failure detection means 41 and the like, a short circuit failure detection means 46 and the like, number-of-detection counting means 21, 22, comparing and discriminating means 21, 22, and error signal output controlling means 21, 22, an error signal can be outputted in the condition that the continuously counted detection number of open circuit failures and short circuit failures detected in relation to a resistance component Ei of a dot printing element becomes equal to a preset reference number or more. |
