zenpert 4D520 - 4.3.4 Set Black Mark Sensor as Media Sensor and Calibrate the Black Mark Sensor; 4.3.5 Set Gap Sensor as Media Sensor and Calibrate the Gap Sensor

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Printer configuration will be restored to defaults as below after initialization.
Parameter
Default setting
Speed
127 mm/sec (5 ips)
Density
8
Media Width
4" (101.5 mm)
Media Height
4" (101.5 mm)
Print Direction
0
Reference Point
0,0 (upper left corner)
Offset
0
Code Page
850
Clear Flash Memory
No
4.3.4 Set Black Mark Sensor as Media Sensor and Calibrate the Black Mark Sensor
Please follow the steps as below.
1. Turn off the power switch.
2. Hold on the button then turn on the power switch.
3. Release the button when LED turns green/amber after 5 green blinks. (Any green/amber will
do during the 5 blinks).
 The LED color will be changed as following:
Amber  red (5 blinks)  amber (5 blinks)  green (5 blinks)  green/amber (5 blinks)
 red/amber (5 blinks)  solid green
4.3.5 Set Gap Sensor as Media Sensor and Calibrate the Gap Sensor
Please follow the steps as below.
1. Turn off the power switch.
2. Hold on the button then turn on the power switch.
3. Release the button when LED turns red/amber after 5 green/amber blinks. (Any red/amber
will do during the 5 blinks).
 The LED color will be changed as following:
Amber  red (5 blinks)  amber (5 blinks)  green (5 blinks)  green/amber (5 blinks) 
red/amber (5 blinks)  solid green