The H7206-B power and logic unit consists of an AC to DC rectifier and
filter, a fan/power module, and a logic module. The unit has 10 indicator
LEDs and one reset switch.
The green +14V bias LED in the lower lefthand corner is lit when the bias
supply on the fan/power module is working.
WARNING:
When the +14V bias LED is off, do not assume the +300V bulk
supply is deenergized. This LED does not indicate the presence or absence
of the +300V bulk supply.
The green LED (L1) in the upper righthand corner of the H7206-B indicates
that the +14V bias on the logic module is working and that the unit has
passed self-test. The eight red LEDs provide fault indications for the power
regulators and for certain other faults such as overtemperature.
Section 3.6 shows passing LED patterns. See Appendix B for a description
of each of the diagnostic LEDs and for troubleshooting instructions.
Wrap-Up and Troubleshooting
3–11
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