Mitsubishi Diamond Pro 920

Questions and Answers

C
Chris StoutJul 30, 2025
How to fix a Mitsubishi Diamond Pro 920 Monitor with no picture?
- V
  Valerie CrawfordJul 30, 2025
  If there's no picture on your Mitsubishi Monitor, first check if the power switch is on and the AC power cord is properly connected. Also, ensure the signal cable is connected and that your computer is powered on. If the power management function is active, press any key on the keyboard or move the mouse.
R
ryanphillipsAug 10, 2025
What to do if Mitsubishi Diamond Pro 920 displays INPUT CHECK ? H V ? ? COLOR CHECK? ? R G? B message?
- J
  Jennifer MeyerAug 10, 2025
  If you see the message 'INPUT CHECK ? H V ? ? COLOR CHECK? ? R G? B' on your Mitsubishi Monitor, check the signal cable to ensure it's properly connected and that your computer is powered on. Also, try pressing any key on the keyboard or moving the mouse to deactivate the power management function.
T
Tommy VegaAug 20, 2025
What to do if Mitsubishi Monitor shows SIGNAL FREQUENCY IS OUT OF RANGE message?
- J
  John WilliamsAug 20, 2025
  If your Mitsubishi Monitor displays the message 'AATTTTEENNTTIIOONN?? ? SSIIGGNNAALL FFRREEQQUUEENNCCYY ?? IISS OOUUTT OOFF RRAANNGGEE..?? ? FFHH ?2244..88KKHHzz FFVV 4433..00HHzz?? ? PPLLEEAASSEE CCHHAANNGGEE ?? SSIIGGNNAALL TTIIMMIINNGG..', the input signal frequency is too high or too low for the monitor to synchronize. Check the specification of the graphics adapter.

Summary

Part Name

Control Names

Identifies and locates front and rear user controls and connectors.

Function

Describes the purpose of each control and indicator on the monitor.

Installation and Connection

AC Power Connection

Details how to connect the monitor to AC power for safe operation.

Signal Cable Connection

Explains how to connect the monitor to the computer via video signal cable.

Connecting to Any IBM VGA Compatible System

Provides specific instructions for connecting to VGA-compatible systems.

Connecting to An Apple Macintosh Computer

OSD Functions

How to Adjust the Screen

Guides users through the process of using the On Screen Display for adjustments.

Summary

Part Name

Control Names

Identifies and locates front and rear user controls and connectors.

Function

Describes the purpose of each control and indicator on the monitor.

Installation and Connection

AC Power Connection

Details how to connect the monitor to AC power for safe operation.

Signal Cable Connection

Explains how to connect the monitor to the computer via video signal cable.

Connecting to Any IBM VGA Compatible System

Provides specific instructions for connecting to VGA-compatible systems.

Connecting to An Apple Macintosh Computer

OSD Functions

How to Adjust the Screen

Guides users through the process of using the On Screen Display for adjustments.

The Mitsubishi Diamond Pro 920 is an auto-scanning color display monitor with digital controls, designed for high-resolution graphics and text across both PC and Macintosh platforms. This user's guide provides comprehensive information on its features, installation, operation, and maintenance.

Function Description:

The Diamond Pro 920 is an intelligent, microprocessor-based monitor compatible with most analog RGB (Red, Green, Blue) display standards. It offers crisp text and vivid color graphics. Its wide auto-scanning compatibility range allows for upgrades in video cards or software without needing a new monitor. Digitally controlled auto-scanning is managed by an internal microprocessor, supporting horizontal scan frequencies between 30kHz and 108kHz and vertical scan frequencies between 50Hz and 140Hz. This intelligence enables the monitor to operate in each frequency mode with the precision of a fixed frequency monitor. The monitor includes resident memory for pre-programmed screen display standards and can store up to 16 additional user adjustment parameters. It is capable of producing a non-interlaced maximum addressable resolution of 1600 dots x 1200 lines, making it well-suited for windowing environments. The analog signal inputs allow for an unlimited palette of colors that can be manually adjusted. A power management function, compliant with VESA-DPMS™-standard, reduces power consumption when the monitor is not in use. For ease of installation and ongoing use, the monitor features an On Screen Display (OSD) for all set-up and adjustment functions. The monitor complies with various safety and EMI standards, including UL 1950, CSA C22.2 No.950, EN60950, FCC Class-B, EN55022 Class-B, MPR-II, ISO 9241-3, ISO9241-7, ISO9241-8, and TCO'99 guidelines for environmental safe use. It features a DIAMONDTRON NF CRT with improved focus and convergence for supersharp and pure picture images. The monitor is VESA DDC™1 and DDC™2B compliant, allowing for automatic Plug & Play setup with compatible computer systems. It also includes a contrast enhancement function (FPM: Fine Picture Mode) to accentuate pictures and graphical images.

Important Technical Specifications:

CRT:
- Size: 50cm/19" (46cm/18" Diagonal Viewable Image)
- Mask type: Aperture grille
- Gun: In-line
- Deflection angle: 90°
- Phosphors: Red, Green, Blue EBU (medium short persistence)
- Aperture grille pitch: 0.24mm
- Face Plate: Anti-glare, Anti-reflection and Anti-static film
- Focusing method: Dynamic Beam Forming (DBF)
Input Signal:
- Video: 0.7 or 1.0Vp-p analog RGB
- Sync: Separate H, V sync., or Composite sync
Signal Interface:
- Input Connectors: DB9-15P
- Input Impedance: 75Ω (video), 2.2kΩ (sync.)
Scanning Frequency:
- Horizontal: 30 - 108kHz
- Vertical: 50 - 140Hz
Resolution (HxV): 1600 dots x 1200 lines Non-Interlaced maximum addressable resolution format at 85Hz
Warm-Up Time: 30 minutes to reach optimum performance level
Brightness: 100cd/m², standard full white video signal at 9300K (+ 8MPCD)
Blanking Time:
- Horizontal: ≥ 2.3 µsec (typ.)
- Vertical: ≥ 500 µsec (typ.)
Display Size: 350mm x 262mm (typ.), ratio 4:3
Color: 5000K~9300K
Power Source: AC100-120/220-240V±10% 50/60Hz 120W (typ.)
Operating Environment:
- Temperature: 5 - 35°C
- Humidity: 10 - 90%RH (without condensation)
Dimensions: (W)17.9inch x (H)18.2inch x (D)18.0inch / (W) 454mm x (H) 462mm x (D) 456mm
Weight: Approx. 23.0kg (50.7lbs.)
Tilt/Swivel Base:
- Tilt Angle: -5° - +15°
- Swivel Angle: ±90°
Power Management:
- Normal Mode: 120 W (Green indicator)
- Power Saving Mode: ≤5 W (Amber indicator)

Usage Features:

Controls: The monitor features front-panel controls including a Power Switch, Power-On Indicator, FPM (Fine Picture Mode) button for contrast enhancement, DOWN button for group icon selection, ITEM SELECT button for item icon selection, and FUNCTION ADJUST buttons for image adjustments.
OSD (On Screen Display): The OSD allows users to adjust various screen parameters such as Contrast, Brightness, Color Temperature, Horizontal Size and Phase, Vertical Size and Position, Pincushion, Keystone, Top-Pin, Bottom-Pin, Pin-Balance, Key-Balance, Rotation, Geometry Reset, Horizontal and Vertical Static, Moire Cancel Level, Corner Purity (TL, TR, BL, BR), Clamp Pulse Position, Video Level, Degauss, Power-Save, Control Lock, OSD Position, Diagnosis, and Language.
Preset Memory: The monitor has factory presets for popular display standards, which automatically adjust picture size and position. Users can overwrite these presets and store up to 16 additional display standards.
Connectivity: It connects to computers via a DB9-15P signal input connector. An optional Macintosh Adapter AD-A205 is available for legacy Macintosh computers, converting the 2-row D-sub video connector to a 3-row D-sub (VGA) connector.
Tilt/Swivel Base: The integrated tilt/swivel base allows for adjustment of the monitor's position up to 15 degrees up, 5 degrees down, and 90 degrees right or left for optimal viewing comfort.
Plug & Play: With VESA DDC™1 and DDC™2B compliance, the monitor enables automatic setup when connected to a Plug & Play compliant computer.

Maintenance Features:

Cleaning: The manual provides guidelines for cleaning the monitor, emphasizing unplugging before cleaning, using a soft cloth for the screen and cabinet, and applying household window cleaner to a soft cloth for the screen if needed. It warns against using benzene, thinner, volatile substances, abrasive cleaners, or spraying directly on the screen.
Troubleshooting: A dedicated troubleshooting section helps users identify and resolve common issues such as no picture, incorrect signal frequency, abnormal picture (missing display, shifts, size issues), dark/bright display, black vertical lines, and buzzing sounds. It suggests checking connections, OSD settings, and signal timing.
Degaussing: The monitor features an automatic degaussing function that runs on power-up to eliminate color shading or impurity caused by magnetic effects. A manual degauss button is also available.