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116 F300S/F300SQ Ultraviolet Lamp System
2. With an ohmmeter set on the highest scale, measure the resistance between the
two outside capacitor terminals and the center terminal. The meter needle should
momentarily deflect upward to indicate continuity, and should then return to
infinity. Reversing the meter leads should give the same indication.
3. If the ohmmeter indicates continuity between the capacitor terminals at all times
(shorted capacitor), or if no meter deflection occurs at all (open capacitor), the
capacitor should be replaced.
4. A resistance check between each capacitor terminal and chassis ground should
indicate infinite resistance (regardless of meter lead polarity).
High Voltage Transformer Removal/Replacement
CAUTION: To maintain proper polarity, transformers must be installed
with terminals in correct locations. Wiring must be reconnected correctly
to the terminals from which it was removed.
1. Disconnect all power, discharge the high voltage capacitors, and disconnect all
leads from the transformer terminals.
2. Unbolt the transformer from the power supply chassis.
3. To replace the transformer, reverse the steps, being certain that terminals are in
the correct locations. Refer to Table 22, “Transformer Terminal Orientation,” on
page 116.
CAUTION: Transformers must be securely mounted to the chassis to
provide adequate transformer grounding.
WARNING: Disconnect all power sources
before servicing high voltage components.
Table 22. Transformer Terminal Orientation
XFMR COM TAP
P300MT T101 Black/White Red/White
T102 Black/White Red/White