Q770 Technical Service Manual
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Adjustment Method
1. Caution
Extremely high voltage are present in the area around the FBT(TH04) and the anode high voltage
Lead.
2. Equipment Required
Digital Voltmeter
Frequency Counter : about 40 Hz to 100 KHz
Color Analyzer
Video Signal Generator
High Voltmeter : up to 30 KV
Alignment Templete : Attachment 1
3. Before Adjustment
Verify that the video output level is 0.7 Vpp at 75 ohm termination and the video timmings are same
as standard timming given in specification. Place the AC power switch to the ON position.
Allow the monitor to stabillize thermally for 15 minutes at least before any adjustment about the
image parameters. The electron optics of the CRT and electronics of system require time of stabillize.
4. Adjustment Procedure
4-1 Horizontal raster center setting
- Video Signal : Back Raster pattern in 60kHz, 768 mode
- Measuring Point : SWH01, main board
- Place the Raster in center of the bezel.
4-2 Factory mode setting
- Turn off the power.
- Keep pressing the menu select key until the power turns on.
- Press the menu select key one more time.
- You can see the âFâ message in 5the bottom on the right of the OSD main menu.
- This is the factory mode.
- Turn off the power to save the adjusted state.
- Select the "Mode Information" menu after you exit the factory mode.
4-3 Rotation setting
- Video Signal : Cross Hatch pattern in 31.5kHz, 400 mode
- Adjust the rotation of screen by using the menu select key and UP And Down Key.
4-4 Color setting
- Adhere color Analyzer sensor closely to CRT center.
- Set Factory mode.
- Video mode : 68.677kHz, 768 mode
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