Schiller CARDIOVIT AT-1, Service Handbook

Page: 49 / 84

49
SCHILLER AT-1 / AT-1smartprint ECG Unit
SERVICE HANDBOOK Issue b June 2001
Art.No. 2.540022
Internal Printer Check
To check the printer and to ensure that every pixel is operational, a built-in printer test
is provided. To carry out the printer check press:
ALT - MAN START
A test printout is given. Four test patterns are available - toggle between the test patterns
with the lead arrow keys up or down.
Carefully examine the printout and ensure that all the lines are even and uninterrupted.
Any faulty printhead pixels will be seen as a horizontal white line. Examine the printout
for evenness of print.
If a faulty pixel is detected, the printer must be replaced. If the printout is uneven (for
example darker at the top than at the bottom), it indicates that the printer alignment is
not correct. If the printout is too faint or too dark, check the TPH temperature in the
service printout given in Chapter 5. Also check the paper; old paper, paper that has
been exposed to light for a long period, or poor quality paper can all adversely effect
the print quality.
NOTE: THE 'SHELF LIFE‘ OF THE PRINTER PAPER IS NOT INDEFINITE. OLD PAPER, PAPER THAT
HAS NOT BEEN STORED IN A COOL DAMP-FREE ENVIRONMENT, OR PAPER THAT
HAS BEEN EXPOSED TO EXCESSIVE HEAT CAN ADVERSELY EFFECT THE QUALITY OF
THE PRINT
Printhead Alignment and Printhead Tension
The printhead tension (the pressure that the printhead exerts on the printer paper) is
achieved with two springs exerting pressure on the printhead: the printhead tension
cannot be adjusted. Similarly, printhead alignment is fixed and cannot be adjusted. If
the printhead tension or printhead alignment is not correct, change the paper tray and
printer assembly.
Possible Printer Problem
Internal Thermoprinter
Corrective Action
Paper jams or does not stop at
correct position.
Clean paper mark detector with a 70% alcohol
solution. (See page 60.) Allow to dry
completely.
Ensure that good quality, fresh paper is installed.
Change the Printer Motor, see page 60-61.
Printout uneven; Fading at top or
bottom. Check evenness of spring pressure of the printer
to roller by pulling a sheet of paper through.
Check roller for wear and symmetry.
Clean printhead (pixel array) with alcohol.
Ensure that good quality, fresh paper is installed.
Faulty pixel. Clean printhead (pixel array) with alcohol.
Replace printer.
Printout too faint or too dark;
General quality poor.
Clean printhead (pixel array) with alcohol.
Ensure that good quality fresh paper is installed.