9507 Color Display Adjustments

193-342 IBM 9507 Color Display

9507 Components
9507 Cable
9507 DC Plug
User Adjustable Effects
9507 Control Settings

9507 Components

© Copyright IBM Corp. 

Index                FRU P/N
1 Display Panel      39G5742
2 Power-supply unit  39G2280
3 Cable-concentrator 39G5727
4 Lift/tilt/swivel   39G2279

9507 Cable

   Wow, this little beauty is made of unobtanium, half life of youllneverseeit. The Keyboard and Mouse connect through pass-through connectors to the system.

9507 DC Plug
Peter Wendt spake:
   Yes I pulled it from under the workbench and I even took it apart, which is a bit tricky due to the *security hex* (not TORX) screws. But I did it.

The DC output ratings printed on it are 12V, 1.3A / 5V, 1.4A, AC input is rated 100 - 240V, 0.6 - 0.3A, 50/60 Hz (worldwide useable).

4 pin plug of unfamiliar shape, ressembles Mini-DIN for keyboard / mouse, but with fewer but thicker pins 4 wires: red, yellow, blue and black.

Looking *into* the DC plug from the open pin side the assignment is as follows:

          ---\=/---              Red    = + 5V 
Red       | o   o |    Yellow    Yellow = +12V 
          |       |              Black  = GND 
Black     \  o o  /      Blue    Blue   = Current Sense (?) 

That blue wire is a bit estranging. There is a difference of 0.6V (monitor off) and 0.4V (monitor on) between that and GND. The power unit has two LED's: amber and green. Amber is "Power", comes on when AC is applied, green is "Activity", comes on when the monitor is connected and the system is not in power save mode.

Height: 225mm, Width: 120mm, Depth: 60mm (body), 130mm (with base). Black and weighs about 300g probably. All-plastic case with 3 catches at the front to accommodate the cable / converter box for the 9507 (that box, which detects the mouse and keyboard signals and turns on / off the screen). DC cable length: about 1 meter, non-detachable.

Hope it makes it clear. Do you want / need photos also ? Else I stuff it back down again. 

User Adjustable Effects
   The two effects which are easiest to identify and adjust are Vertically and Hoizontally off-center image. Other effects are more subtle. In particular, liquid-crystal displays driven by an analog source exhibit certain optical effects which may, in some applications and workplace environments, over a period of time become distracting. 

 They are liable to be perceived by the user as: 
      Slight tremors up or down the vertical lines of tables, boxes and text characters, the tremors may seem to be moving or stationary. A faint, linear, horizontal, background quiver in areas of solid color. Slight ghost-imaging or smearing of horizontal lines. They indicate that the optimum internal settings of the display panel installed by the factory need to be fine-tuned to the application or workplace lighting conditions. 

 However there are some colors which liquid- crystal displays cannot represent easily when driven by an analog source. The display creates these colors by switching alternate pels on and off, or half off. If you cannot get an acceptable rendering of a particular color, the user may have to choose another. 

From Peter 
   It really runs best in 16-colors VGA mode. Greyscales cause a lot "turbulences" on the display - running horizontal lines and such. Don't forget that the display is "analog attached": the signal from the video card is converted into analog signals and back to digital in the monitor. No comparison with modern large scale TFT LCDs, which have digital direct drive without the DA-AD conversion stage. 

 Non adjustable Effects 
 Liquid-crystal displays are liable to experience condition refereed to as failed sub-pixels. The user becomes aware of them as dark or bright  pinpoints which appear, in every application, at the same place, or places, on the screen. 

 You cannot adjust these pinpoints or remove them. The design specification for the IBM 9507 Color Display allows a small number of failed pixels, comprising a mix of on-pels and off-pels. 

9507 Color Display Adjustment Settings
   Only attempt to fine tuning when stable temperature conditions have been established for the IBM 9507 Color Display. This will generally mean that the display panel has been running for at least 20 minutes. 

Leave Switch D at 0 and Switch A at 1.
D  Factory use only (set at position 0).
C  Position 0 - automatic installation at factory of a full-screen image.
   Position 1 - to expand or compress the image.
A  Position 0 - factory use only.
   Position 1 - to enable user adjustment.
A1 Factory use only

Rotary Switch B Functions 

Use B2  to decrease value (-).
Use B3 to increase value (+).
Use B1 to set ALL functions back to factory defaults.

        For each function selected with the rotary switch B pushbuttons B2 and B3 are used to effect a shift, in opposite directions, from the current internal settings. The shift in settings affects the characters on the screen. One press causes a one-increment shift in the value of setting.
Note: The recessed pushbutton B1 is a RESET pushbutton. When it is pressed, the settings installed at the factory are re-installed. You may press pushbutton B1 (for example, with the tip of a pen) at any time during fine tuning at any function selected with rotary switch B.

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 08 May 2024 - Changelog | About | Legal & Contact