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Troubleshooting
Buttons
54
Condition
Battery does not charge.
Table 6 lists symptoms of problems relating to non-responsive buttons and
recommended actions. If the action requires replacement of a PCB, refer to
Disassembly Guide on page 63.
Symptom
The N-595 turns on but
does not respond to some
or all of the buttons.
Table 5: Power Problems
Recommended Action
•
Replace battery if it is more than 2 years old.
•
If the battery fails to hold a charge, replace the
battery as indicated in Battery Replacement on
page 67.
•
Open the monitor as described in Monitor
Disassembly on page 65. Verify the power
supply's output to the battery while on AC.
Disconnect the battery leads from the power
supply and connect a DVM to them. The voltage
measured should be 6.8 VDC ± 0.15 VDC and
the current should be 400 mA ± 80 mA. Replace
power supply if above values are not met.
Table 6: Button Problems
Recommended Action
•
Replace the User Interface PCB. See User
Interface PCB Removal/Replacement on
page 76.
•
If the buttons still do not work, replace the Top
case assembly. See Top Case Assembly Removal/
Replacement on page 80.
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