奇
菱
光電股份有限公司
Chi Lin Optronics Corp.
Doc. No
CS-72601
Version A3
Title
CHT-726 Level 1 Service Manual
Page
15 / 75
6. Service
Mode
The Service Mode is released for authorized distributor and technician only. It provides Test Patterns,
Adjust CW, CW Index, VGA Auto Calibration, MST9888 Component YPbPr, AD9882 VGA RGB,
SAA7118, DLP RGB Gain Offset, and firmware version information for the Video board, the formatter
board, and the control board.
Authorized technician will need to enter service mode when doing inspection and color setting
adjustment after replacing the video module.
How to enter Service Mode
By pressing clockwise
and “MENU” button to enter into the main menu of the
Service Mode.
How to exit Service Mode
Press the “ exit” button to leave Service Mode
6.1 Options:
There are two items under Option, one is video format, which is set to “Auto” generally, and another is
DLP Vsync.
6.2.1 Video Format
Video Format provides 20 different formats, such as NTSC 60Hz, PAL 50/ 60Hz…etc. for use.
Normally, the default of video format is “Auto”, so that projector to take all video formats. However,
distributor would force projector to take one video format if needed.
※
Caution: Once the Video Format is selected to particular format, projector will not read signal of
other format.
6.2.2 DLP Vsync
DLP Vsync shows the signal is 50Hz or 60Hz.