5)Power switch（8）
Turn on/off the printer. “O” is to turn off the printer;
6)Back cover latch（9）
Catch back cover latch and pull it out to open the back cover.
7)Paper near end sensor（19）
Detect the status of paper roll. If paper near end, the PAPER LED will on, the ERROR LED will flash and indicate user to replace paper. The printer will continue printing until the paper is end.
8)Paper sensor（21）
Paper sensor is used to detect the printer with or without paper.
9)Mark sensor（22）
When using mark paper, mark sensor is used to detect mark.
10)Back cover sensor（23）
Back cover sensor is used to detect the position of the back cover.
11)Paper guide（24）
There are three long slots at the bottom of paper cabinet. The paper guide could be plugged in different slot which is suitable for different wide paper, such as 76.5±0.5 mm, 69.5±0.5 mm, 57.5± 0.5 mm. Without paper guide, paper width of the printer is 80±0.5 mm.
Caution：
The paper guide is a necessary part of the printer for adjusting paper width, please keep it carefully.
3.2 LEDs and Buzzer
The table below shows LEDs and buzzer in error status:
|
| Error |
| Buzzer |
| ERROR LED |
| PAPER LED |
|
|
|
|
|
|
|
|
|
|
|
|
| HP error |
| Interval buzzing |
| Interval flash |
| Off |
|
|
|
|
|
|
|
|
|
|
|
|
| Print head overheated |
| Six sounds |
| Six times |
| Off |
|
|
|
|
|
|
|
|
|
|
|
|
| Abnormal voltage |
| Five sounds |
| Five times |
| Off |
|
|
|
|
|
|
|
|
|
|
|
|
| Cutter error |
| Four sounds |
| Four times |
| Off |
|
|
|
|
|
|
|
|
|
|
|
|
| Back cover up |
| Three sounds |
| Three times |
| Off |
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
| |
|
| Front cover up |
| Three sounds |
| Three times |
| Off |
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
Paper end | Two sounds | Two times | On |
Paper near end* |
| One time | On |
Pause to wait |
| Off | Flash |
Caution：
The printer checks the print head temperature via thermal resistor. If the print head is extremely overheated, the printer will stop printing.
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