Brand: HITACHI
Category: Other
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for CM751ET
Uploaded: Nov. 21, 2025, 9:24 p.m.
Warranty Information
None
POWER ON/OFF
Press the Power Switch to switch the power ON/OFF. When power is ON, the power LED lights.
DEGAUSSING
Press the DEGAUSS button to degauss manually. Use this function when color impurities appear after turning ON the monitor. The monitor is automatically degaussed during initial power on. Wait for about 10 minutes before repeating.
ADJUSTMENT
Press the select switch for the item to adjust. Use the adjust switches to make changes. The 'EasyMenu' On Screen Display shows selected items and adjusting conditions. You can adjust Contrast and Brightness directly without selecting an item when EasyMenu is not shown.
STORE
Press the STORE switch to save current adjustments. Settings can be stored for each video mode, up to 26 sets of geometry settings. Storing a new setting may overwrite the oldest user setting.
RESET
To cancel all stored data and reset to original settings, turn ON the power switch while pressing the switches.
SIGNAL CHECK
Press the (CONTRAST/BRIGHTNESS) switch to display horizontal and vertical frequencies.
AUTOMATIC SIGNAL CHECK
The monitor automatically indicates signal input conditions, including proper signal, no sync. signal, power saving mode, or unstable sync. signal.
VIDEO MUTING
Automatically mutes the picture during input signal changes to hide scrambled images.
Troubleshooting and error codes
| Condition | Indication | Sample of "EasyMenu" |
|---|---|---|
| When the monitor detects proper signal. | The EasyMenu indicates the horizontal frequency and vertical frequency. ● Precision frequency, Horizontal approximately ±2 kHz Vertical approximately ±2 Hz |
80 kHz/ 75Hz |
| When the monitor detects no sync. signal. | The EasyMenu indicates the message "INVALID SYNC." for 5 seconds. ● Verify power switch of the computer and cable connection. |
INVALID SYNC. |
| When the monitor will go into the power saving mode. (Refer to page 15) | The LED of the power switch (O) flashes. ● Verify power switch of the computer and cable connection. |
- |
| When the monitor detects a sync. signal which is out of set-up specification or is unstable. | The EasyMenu indicates the message "INVALID SCAN FREQ.". ● Verify the specification of input signal. |
INVALID SCAN FREQ, |