This table specifies the resolution by model number or touch technology type.
Condition description Resolution
Unacceptable image quality All models:
1. Verify that the video mode is set to 800 x 600 (except model 5xx,
which should be set to 1024 x 768).
2. Press the (+) and (-) buttons on the bottom of the display
simultaneously to get a menu of options. Activate the Auto-Adjust
option by pressing the (+) button (excluding models 48x).
3. Check the video cable connections, and replace the cables, if
necessary.
4. Check whether touch screen or protective screen is dirty. If
necessary, clean the screen (see “Cleaning the touch screen” on
page 67).
All
models except Models 2xx, 5xx, 48x:
1. Select Manual Adjust by pressing the (-) button and then the (+)
button.
2. Activate the Phase option by pressing the (+) button and adjust
the phase by pressing the (+) and (-) buttons until you obtain the
best display image. Press (+) and (-) at the same time to save the
setting.
3. To manually adjust the Clock, Horizontal and Vertical, select
your option by pressing the (-) button and then activate it by
pressing the (+) button. Adjust by pressing the (+) and (-) buttons
until you obtain the best display image. Press (+) and (-) at the
same time to save the setting.
4. Run the 4820 Video Quality Test Pattern program (excluding
models 48x, 10D, 1FR, 2xx, and 5xx).
Models 46x, 42x, and 4Fx, use the service diskette and run the
display test for your host system. If the test is successful, the
application software can be failing.
For models 48D, 48T, run the IBM POS Device Diagnostics, which
came with the POSS for Windows installation.
Pixel defects Displays occasionally have bright (always on) dots or dark (always
off) dots. All TFT suppliers consider a small number of these pixel
defects to be acceptable. The exact number depends on the supplier
and the size of the LCD. Typically, two to three defective pixels of
each type is considered acceptable.
Magnetic stripe reader (MSR) malfunctioning All Models:
1. Check that the cable is securely connected.
2. Make sure the MSR is securely attached to the display.
3. Run the MSR test using the service diskette.
4. Replace the MSR.
5. For models 48D, 48T, see the IBM POS Device Diagnostics,
which came with the POSS for Windows installation.
Keypad malfunctioning All Models:
1. Check that the cable is securely connected.
2. Make sure the keypad is securely attached to the display.
3. Run the keypad test using the service diskette.
4. Replace the keypad.
5. For models 48D, 48T, see the IBM POS Device Diagnostics,
which came with the POSS for Windows installation.
Update November 2005
76 4820 Planning, Installation and Service Guide
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