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--- en:ovi40build:displaybuild [18.02.2018 14:04] – Include forum post F4HTX df9ts
+++ en:ovi40build:displaybuild [25.04.2018 07:28] – [Display Calibration - mandatory at first bring-up] included post of Slawek df9ts
@@ Line 16: / Line 16: @@
   * 3.2" display 320 x 240 witch controller IL9325 (or IL9325 compatible controller): this was the display used during UI V1.8 beta testing
   * 2.8" display 320 x 240 with controller IL9325 (or compatible controller): this is the mcHF defult display
 |< 95% 50% 50% >|
@@ Line 24: / Line 25: @@
 <bootnote important>It is mandatory to do a display calibration at first bring-up / switch on of the touch screen display. Only after calibration will the touch screen work with UHSDR.</bootnote>. The calibration is required initially. No later calibration needed during operation.
-Start the calibration by touching the touch screen with a finger **before**  switching on the UI board V1.8. Keep touching the touch screen until the service menu sis displayed. Now release the finger from the touch screen and follow instructions on the screen carefully. After calibration is finished please save the calibration by long-pressing the "menu" button switch on the UI board, then long-press "power" button.
+Start the calibration by touching the touch screen with a finger **before**  switching on the UI board V1.8. Keep touching the touch screen until the service menu sis displayed. Now release the finger from the touch screen and follow instructions on the screen carefully. After calibration is finished please leave the test screen by pressing the POWER button and then, when firmware start to work, please long press MENU (F1) button to save the calibration settings (the MENU should be marked with * and different colour, which means you have not saved settings).
+Sometimes calibration fails and there is need to repeat it. That's why there is a test screen with drawing dots (you can use also the blue test screen to check if it works). You have to play with it to be familiar. If the accuracy is not perfect (it should be less than 1mm) you have to change the calibration method or have issue with the panel itself. One preferred method for calibration is to use plastic stylus or soft pencil (gentle), but you can do it with nail with good results.
 ==== Mechanical fixing of the display board onto the UI board ====
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 ==== On shortening the male header J103 on OVI40 UI for LCD display ====
-Cutting the male header pins pf J103 (on component side) is required to reduce height of the LCD Display module above OVI40 UI PCB. Cutting / shortening the pins on component  side might not be the best idea as it damages the female connector each time it's inserted, due to the fact that cutting the J103 pins produces sharp edges that scratch the femaile LCD display header.
-An alternative is to solder the pins at the right depth and then cut the pins flush to the pcb on the solder side.
+Cutting the male header pins pf J103 (on component side) is required to reduce height of the LCD Display module above OVI40 UI PCB. Cutting / shortening the pins on component side might not be the best idea as it damages the female connector each time it's inserted, due to the fact that cutting the J103 pins produces sharp edges that scratch the femaile LCD display header.
+An alternative is to solder the pins at the right depth and then cut the pins flush to the pcb on the solder side.
+\\