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Troubleshooting
The printer is not operational, but the N-20P continues to
obtain patient measurements.
Symptom 6:
See Section 4.7 for error codes.
Symptom 7:
The real-time clock (RTC) battery may be exhausted.
Symptom 8:
Fuse F2 on the auxiliary PCB may be open.
Symptom 9:
only).
The thermal paper may be improperly loaded; characters can
be printed on only one side of the thermal paper roll.
Symptom 10: Paper mechanism jams (N-20P only).
Note: If a printer paper jam is detected during Power-On Self-Test, Pr Err may appear on the display.
4.6
Service Procedures
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).
4-4
Cause
Err followed by a number appears on the display.
Cause
Time or date is incorrect (N-20P only).
Cause
Printer fails to operate (N-20P only).
Cause
Printer paper advances but instrument does not print (N-20P
Cause
Cause
Action
Check to see if the paper is jammed.
Examine the print head and ensure that it has
returned to the home position.
Action
Record the number that is displayed.
Action
Replace the RTC battery (see Section 4.6.4).
Reset the time and date (see Section 4.6.3).
Action
See paragraph 4.6.5 for information about
fuses.
Action
Ensure that the thermal paper is properly
loaded; if needed, remove the roll of printer
paper and reload the printer paper.
Action
Switch off the N-20P. 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.
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-20 Disassembly
Procedure, and 4.6.2, Loading/Clearing
Printer Paper).
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