5
1502154 Rev D Configuration 5-5
Voltage Testing
Check the power distribution system according to Table 5.3. Record all voltages on the Amplifier
Data Sheet (Appendix F).
CAUTION Testing voltage at any centerseizure screw in an operating system may
interfere with, or cause the loss of, signal to the subscriber.
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 5.3 Testpoints and Test Values
Testp oint
1
1. Attach the ground lead to the amplifier housing.
Acceptable Range Troubleshooting when Unacceptable
AC insertion port
centerseizure screw
42–95V
AC Verify that neither the center conductor pin nor the
power cable are shorted to ground.
Check the tightness of the centerseizure screw.
Check cable plant powering.
AC insertion port
fuse input
42–95V
AC If power is acceptable at the centerseizure screw, but
not at the fuse input, check the cabling, plugs, and jacks
between the power supply and RF module.
Check for a short circuit or broken current path.
All fuse inputs and outputs 42–95V
AC If power is present at a fuse input, but not at a fuse
output, check for a blown or misaligned fuse. Replace or
reinsert the fuse. If the fuse blows when reinserted,
check the distribution system for short circuits.
AC IN testpoint 42–95V
AC Check the MAIN FUSE.
All power passing port
centerseizure screws
42–95V
AC If power is acceptable at the power passing fuse output,
but not at the associated centerseizure screw, check the
cabling, plugs and jacks between the power supply and
the RF module.
RAW DC testpoint 37–100V
DC Replace the power supply.
B+ testpoint
[+24 V
DC test]
23.5–24.5V
DC Replace the power supply.
[AC ripple test] <15mV
AC Replace the power supply.
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