Service manual

Performance Verification
2-12
Display Test (PageWriter 200/200i/300pi only)
The display test shows test patterns on the display. Each of the following patterns appear
in this order:
• all pixels lit to create a black screen
• no pixels lit to create a white screen
• a vertical bar scrolling from left to right
You must observe the display while the test pattern is running to ensure:
• no burned out pixels
• no random lines or dots in the display
• no permanent patterns visible at normal contrast. Patterns may be visible at low contrast
(darker screen); this is normal.
• no LCD flickering
It is normal for the top row of the LCD to have some pixels on during the first sweep of
the vertical bar.
This test relies on the visual inspection of the test patterns for detecting failures. There is
no failure message for the display test.
Indicator Light Test (PageWriter 100 only)
During this test, all indicator lights turn on and off at least once. At one point, the indicator
lights flash rapidly for a short time.
Printer Test
The printer test exercises the printhead and paper drive mechanism by printing test
patterns and diagnostic data on the page. The patterns consist of a rectangular area that
contains the entire character font set, timing tics, diagonal lines, and stepped bars. On the
PageWriter 200/200i/300pi cardiographs, the printer test and the display test are
conducted simultaneously. The printer test continues until the cardiograph is placed in
Standby mode.
When the printout is complete, inspect it for:
• straight diagonal lines
• even spacing between diagonal lines
• consistent print quality for all patterns
• constant width between timing tics (25 mm ±1%)
• consistent length of timing tics
• accurate rendition of all characters
• clean stepped bars with no dropout in black areas
• even spacing between diagonal lines at the beginning of the page
NOTE