4-4 FlexNet
®
700 Series Line Extender Rev F
4
➤ To test a 60V or 90V linear power supply
1. Measure AC voltages at the MAIN FUSE and compare to the range shown in Table 4.2:
■ If the measurements are out of the acceptable range, take the appropriate
action shown in Table 4.3.
■ If the measurements are within the acceptable range, record the values on the
FlexNet® 700 Series Line Extender Data Sheet located in Appendix C.
2. Measure and adjust Raw DC voltage:
a. On the RF Module, set the Raw DC Voltage Selector Switch to position 1, the lowest
position.
b. Measure the DC voltage at the RAW DC T.P.
– If the voltage measured is less than 28 V
DC, move the selector switch to the next
higher position and remeasure.
– If the voltage is greater than 35 V
DC and the selector switch is in the lowest
position, replace the RF module.
3. Measure the B+, AC Ripple, and Reverse B+ (if applicable) and compare to the range shown
in Table 4.4:
a. If the measurements are out of the acceptable range, take the appropriate action
shown in Table 4.4.
b. If the measurements are within the acceptable range, record the values on the
FlexNet® 700 Series Line Extender Data Sheet located in Appendix C.
Tip: For Linear Power Supplies: Cold weather conditions reduce the resistance of the
cable, raising the AC input voltage and resulting Raw DC voltage. If the measured value
of the Raw DC is near the bottom of the acceptable range (28 VDC) and the aerial cable
carrying the power is currently subjected to very cold conditions, set the Raw DC Voltage
Selector Switch to the next higher position. This will compensate for increased resistance
when the cable is warmer.
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