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Troubleshooting
4.7
Service Procedures
4-4
Dashes (- - -) appear in
the display.
Pr Err is displayed
during the POST.
Err followed by a
number appears on the
display.
Time or date is
incorrect.
Printer fails to operate.
Printer paper advances
but instrument does not
print.
Paper mechanism jams.
Note: If a printer paper
jam is detected when
the printer is turned on,
Pr Err may appear on
the display.
The following service procedures are most likely to be encountered by the
service technician. The PCB designation for a component appears in
parentheses; for example, (BT1) or (U15).
The sensor is not connected
to the instrument.
The printer is not operational
(however, the N-20PA
continues to obtain patient
measurements) due to paper
jam or print head not in the
home position.
See Section 4.7.8 for error
codes.
The real-time clock (RTC)
battery may be exhausted.
Fuse F2 on the auxiliary
PCB may be open.
Batteries may be low.
The thermal paper may be
improperly loaded;
characters can be printed on
only one side of the thermal
paper roll.
Switch off the N-20PA. Then
check to see if the print head
is at the home position; if so,
attempt to pull the paper out
by pulling gently - - do not
force it.
Check all sensor
connections; try substituting
another sensor. Check all
extension cables. If an
extension cable is in use,
remove it and plug the sensor
directly into the instrument.
Check to see if the paper is
jammed. Examine the print
head and ensure that it has
returned to the home
position. Turn the printer off,
then on again.
Record the number that is
displayed.
Replace the RTC battery (see
Section 4.7.4).
Resent the time and date (see
Section 4.7.3).
1. See Section 4.7.5 for
information about fuses.
2. Replace old batteries with
fresh batteries.
Ensure that the thermal paper
is properly loaded; if needed,
remove the roll of printer
paper and reload the printer
paper.
If the print head is not at the
home position, and the paper
cannot be easily pulled out
from the printer, then the
printer may need to be
disassembled to remove the
paper jam (see Sections 5.3,
N-20PA Disassembly
Procedure, and 4.7.2,
Loading/Clearing Printer
Paper).
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