4-2 FlexNet
®
700 Series Line Extender Rev F
4
2. Verify that an appropriate MAIN FUSE is installed. Table 4.1 lists the appropriate MAIN
FUSE values for E7 Line Extenders. Inspect the fuse for visual defects.
■ In E7 Line Extenders with 117VAC powering, the MAIN FUSE is located in the RFI
filter and must be removed for visual inspection. Refer to Fuse/Brass Shorting Bar (Slug)
Replacement on page 6-1 for removal and installation instructions.
■ All other E7 Line Extenders have a MAIN FUSE located in the RF module (see
Figure 2.3 on page 2-4) which can be visually inspected without removing.
3. Check the system map to determine whether the E7 Line Extender requires through
powering. If so, verify that the required fuse, buss bar (slug), or surge terminator is installed
in the THRU POWER FUSE location (see Figure 2.3 on page 2-4). Table 4.1 lists the
maximum continuous AC current passing approved for these line extenders.
Voltage Testing
E7 Line Extenders offer four powering options with the following acceptable ranges:
Testing the voltage of a power supply rquires the use of Table 4.3 and Table 4.4. Refer to the
instrucitons that follow based on your particular powering option:
➤ To test a 1 1 7 VAC linear power supply
■ Measure the B+, AC Ripple, and Reverse B+ (if applicable) and compare to the range shown
in Table 4.4:
– If the measurements are out of the acceptable range, take the appropriate action
shown in Table 4.4.
– If the measurements are within the acceptable range, record the values on the Data
Sheet located in Appendix E.
Table 4.1 Fusing/Power Passing Considerations
Power Supply Main Fuse/P.S. Fuse Maximum Continuous
AC Current Passing
60V Linear 2A, slo-blo E629 and E729: 10A
All other E7:13A
90 Volt Linear 2A, slo-blo 13A
90 Volt H.E. 6.25A, slo-blo 13A
117 Volt Linear 1A, slo-blo N/A
Note: Do not test the voltage at any centerseizure screw in an operating system. Doing
so may interfere with, or cause the loss of, signal to the subcriber.
Note: AC measurements may read up to 10% error if a true-rms meter is not used. AC
ripple measurements cannot be made without an AC-coupled meter.
Table 4.2 AC Test Values
Powering Option Acceptable Range
60 Volt Linear Power Supply 40-60V
AC
90 Volt Linear Power Supply 60-95VAC
90 Volt H.E. Power Supply 40-95VAC
117 VAC Linear Power Supply 105-125VAC
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