From the manual I have
1. Press the power pad to turn on
press home pad to ensure home screen is displayed
2. Press the help pad. the main help screen is displayed.
3. Press the help and start stop pads for 3 sec simultainiously.
The factory test screen is displayed.
4. Press test load on the screen.
5. The contrast screen is displayed. Press the start/stop pad once to cycle through the screen
6. press start/stop pad. The test load screen is displayed.
More to come... I will try to copy and paste what it says. I can try to send a copy of the pdf if you give an email.
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