Troubleshooting Flowchart (For Systems With Three-Port Mhus) - ADC ClearGain Dual Inline Tower Mounted Amplifier System User Manual

4.3

Troubleshooting Flowchart (For Systems With Three-Port MHUs)

If directed by the flowchart, refer to the troubleshooting matrix in
loss sweep guide in
MHU
OFF
led
YELLOW
SOLID
PDU OR
CONNECTIVITY
PROBLEM
REFER TO TROUBLESHOOTING MATRIX
Section 4.5.
START
ANY
NO
LIGHTS ON
THE PDU?
YES
RED ALARM OFF
led
ONE
PATH
FAILING
• CHECK SUPPLY IS -56 to -20 VDC or +20 to +56 VDC.
The red lead is connected to the higher potential.
• CHECK SUPPLY FUSE/BREAKER IS OK. (5A RATING)
• CHECK DC CABLE AND CONNECTION.PROBLEM
The red Fail led should come on when any MHU
select dip switch is pushed to the down position. If
the bias-t connection is not made.
The red Alarm led should come on
when any MHU select dip switch
OFF is pushed to the down position. If
MHU
the bias-t connection is not made.
led
• CHECK DC CONNECTIVITY
TO
GREEN
• CHECK MHU PORT FOR 18VDC.
IF NOT PRESENT, REPLACE PDU.
• CHECK BIAS-T CABLE FOR
PRESENT,
REPLACE BIAS-T CABLE.
• CHECK BIAS-T FOR 18VDC.
IF
PRESENT, REPLACE BIAS-T.
TTA ACTIVE
• CHECK RESISTANCE OF
FEEDLINE.
-
SHORTED;
PROBLEM TOP SIDE.
-
NORMAL
BUT ALSO MAY INDICATE A
ADCP-75-214 • Issue 2 • September 2006
Section 4.4 or to the return
THE
18VDC. IF NOT
NOT
LO OHMS OR
HI OHMS OR OPEN IS
DISCONTINUITY.
21401-A
© 2006, ADC Telecommunications, Inc.
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