Inspection Procedure - Optoma EP756 Service Manual

8-8
EP757
SERVICE MANUAL

8-5 Inspection Procedure

RESET :
Please press “Menu” button on the projector panel to enter “Factory Reset” Function then
choose “YES” and press “Enter” to see if it works. This action will allow you to erase all end-
user’s settings and restore the original factory setting.
Hi-Pot and Grounding Test :
¡ Hi-Pot Specification : 1.5kVAC, 10mA, 2 seconds.
¡ Grounding Specification : 12VDC, 25A, 0.1 ohm.
Clock and Clock Phase :
Test Signal : 1024 x 768 @ 85Hz
Test Pattern : Line Moire Pattern
¡ Check and see if image sharpness and focus is well performed.
¡ If not, readjust by following steps.
- Enter “Digital Conversion” menu and select “Clock” Function to adjust the total pixel num-
ber of pixel clock in one line period.
- Then select “Clock Phase” Function and use right or left arrow key to adjust the value to
minimize video flicker.
R, G, B and White Colors Contrast :
Test Signal : 1024 x 768 @ 85Hz
Test Pattern : 64 or 16 R, G, B and White colors Intensities Pattern
¡ Please check and see if each colors is normal and distinguishable.
¡ If not, please return the unit to repair area.
Introduction Fundamental Principle
Troubleshooting Function Test and Alignment Procedure
Mechanical Construction Procedure of Disassembly
Firmware Upgrading Procedure
Function of Boards Specifications
DDC Key-In Procedure Appendix