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4. ADJUSTMENT

4-1ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them have been

carefully preset at the factory.

4-2 MAIN ADJUSTMENTS

NO. FUNCTION LOCATION DESIGNATION

1. 220V ADJ PCB - MAIN VR902

2. HV ADJ PCB - MAIN VR703

3. SCREEN ADJ FLY BACK TRANS T403

4. FOCUS ADJ FLY BACK TRANS T403

5. ABL ADJ PCB - MAIN VR701

6. SUB-BRIGHTNESS ADJ PCB - MAIN VR702

-MENU PCB - MAIN SW103

-UP

PCB - MAIN SW105

7. FUNCTION ADJ -DOWN

PCB - MAIN SW104

-VIDEO 1/2 PCB - MAIN SW102

4-3 ADJUSTMENT METHOD

1. 25V, HV voltage adjustment:

A. Chroma-2000 Signal generator or PC equivalent set mode 1, VGA 1024X768 pattern 1.0 .

B. Connect a DC Volt meter between D918 cathode and ground, then adjust VR902 to be 220VDC.

C. Connect a DC Volt meter between TP701(G1) and ground, Brightness set to max. Then adjust

VR702 to be

-35 VDC(HM703*)/-55VDC (HA(F)703*)/-10VDC (HM704U*)

2. Factory preset Timings Adjustment:

A. Press MENU Key to show OSD window, press Up or Down Key to switch the functional controls.

B. Press the Up Key to select the "Information" function, then press the MENU Key. While do not

release

the MENU Key until the OSD window changed to the Factory preset window.

C. The Factory preset window contains the following functional controls. Select one of the controls.

Then press the Up/Down Key to adjust it's value for the optimum picture.

Iiyama HM704UTC User Manual

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