Rev F
Configuration
4-3
4
➤
To test an H.E. 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 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
Amplifier Data Sheet located in Appendix C.
Table 4.3 AC Testpoints
Testpoint
1
1. Attach the ground lead to the line extender housing.
Test Values
Troubleshooting when Unacceptable
PORT 1
Centerseizure Screw
2
2. Test in outage situations only.
See Table 4.2
Verify that the center conductor pin and power cable are not
shorted to ground.
Check the tightness of the centerseizure screw.
Check cable plant powering.
MAIN FUSE
or
THRU
POWER FUSE
3
inputs
(left fuseclip)
3. Not applicable to units with a 117V
AC
linear power supply.
See Table 4.2
If power is acceptable at the centerseizure screw, but
unacceptable at the fuse inputs, replace the RF module.
MAIN FUSE
or
THRU
POWER FUSE
2
outputs
(right fuseclip)
See Table 4.2
If power is present at a fuse input, but not at the 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.
PORT 3
Centerseizure Screw
(if thru powering)
See Table 4.2
If power is acceptable at the
THRU POWER FUSE
output,
but unacceptable at the Port 3 centerseizure screw, replace
the RF module.
Table 4.4 DC Testpoints and Test Values
Testpoint
1
1. Attach the ground lead to the line extender housing.
Power
Supply
Acceptable Range
Troubleshooting when Unacceptable
RAW DC
T.P
.
Linear P.S.
Only
28 - 35V
DC
Adjust the Raw DC selector switch.
Replace the RF module.
B+ T.P.
Linear P.S.
22.8 - 25.2V
DC
Replace the RF module.
H.E.P.S.
23.5 - 24.5V
DC
Replace the power supply.
REV B+ T.P
.
Linear P.S.
Only
22.8 - 25.2V
DC
Replace the RF module.
B+ T.P.
(AC Ripple)
Linear P.S.
< 20 mV
AC
Replace the RF module.
H.E.P.S.
< 15mV
AC
Replace the power supply.
Summary of Contents for FlexNet E629
Page 2: ...Introduction fm Page 10 Monday April 1 2002 12 43 PM ...
Page 16: ...1 8 FlexNet 700 Series Line Extender Rev F 1 ...
Page 26: ...2 10 FlexNet 700 Series Line Extender Rev F 2 ...
Page 64: ...4 22 FlexNet 700 Series Line Extender Rev F 4 ...
Page 82: ...A 6 FlexNet 700 Series Line Extender Rev F A ...
Page 88: ...B 6 FlexNet 700 Series Line Extender Rev F B ...
Page 102: ...C 14 FlexNet 700 Series Line Extender Rev F C ...
Page 104: ...D 2 FlexNet 700 Series Line Extender Rev F D ...
Page 110: ...Index 4 Rev F ...
Page 111: ...Introduction fm Page 10 Monday April 1 2002 12 43 PM ...
