Table 20. Reference Table; NPS 540+ with external power supply
1. Ensure the power supply is +9 volts.
CAUTION:
A +12 volt power supply will damage the NPS.
2. Disconnect power supply from NPS and check for +9 V ac output at the disconnected power supply.
3. If +9 V ac is missing, replace the power supply.
Region or Country: Part Number:
U.S.A. 30H4064
Europe 30H4061
U.K. 30H4062
Australia 30H4063
Japan 30H4065
4. If +9 V ac is present, replace the NPS unit.
5. Go to Step 2 on page 61.
Table 21. Reference Table; NPS 640, 642 or 542+ with external power supply
1. Disconnect power supply from NPS and check for +12 V ac output at the disconnected power supply.
2. If +12 V ac is missing, replace the power supply.
Region or Country: Part Number:
U.S.A. 14H7318
Europe 14H7320
U.K. 14H7319
Australia 30H4066
Japan 30H4021
3. If +12 V ac is present, replace the NPS unit.
4. Go to Step 2 on page 61.
Chapter 1. Diagnosing Problems
155
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