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1. Press the ADV button to change the darkness setting. The printer prints a line with each button
press, and the setting increments from lighter to darkest and then wraps back to lighter.
2. Allow the N-20P to switch off (about 30 seconds). The last print darkness setting is remembered
when the N-20P is switched back on. Test this by repeating the procedure and skipping step 3.
4.7
Error Codes
If a failure is detected during the Power-On Self-Test or during any performance test, the error
message (Err) appears in the Oxygen Saturation display and a 3-digit error code number appears in the
Pulse Rate display.
If an error message appears, find its category (the first digit of the error code represents the category)
and record the error code number. Match the number to the description in the following table, and
contact Mallinckrodt's Technical Services Department or Mallinckrodt's local representative for
assistance.
Internal tests are performed in the order of the table listing. The first error condition encountered is the
one displayed.
4.7.1
Category 1 — Microprocessor Errors
Errors in the CPU (main PCB). Likely action is replacement of the CPU.
101
102
103
104
105
106–109
110
111
112
113, 114
115–117
118
119
120
121
122
123
124
125
126–129
4.7.2
Category 2 — RAM Memory Errors
Errors in RAM memory (main PCB). Likely action is replacement of the main PCB.
Note:
The parenthetic line description is not printed, and button presses are
ignored whenever the printer is printing.
Table 4-1: Microprocessor Error Codes
Error in internal RAM registers test
Error in zero register test
Error in register contents clearing test
Error in register contents increment test
Error in register contents decrement test
Errors in logical operations test
Error in exchange test
Error in timer tests
Error in window select register test
Errors in stack manipulation test
Errors in CPU flags test
Error in interrupt pending register test
Error in program counter test
Error in CPU serial port test
Error in pulse width modulation register test
Error in A/D register test
Error in addressing modes test
Error in high speed input register test
Error in content addressable memory test
Errors in arithmetic operations test
Troubleshooting
4-7
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