Crescend Technologies C7 SERIES Manual de instalação e serviço - Página 16

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6.

TROUBLESHOOTING

6.1.

INTRODUCTION

This section contains a list of potential problems and suggested actions to be taken. If the
suggested corrective action does not eliminate the problem, please contact your Crescend
factory for further instructions.
NOTE: Check your sales order and equipment warranty before attempting to
service or repair the unit. Do not break the seals on equipment under warranty
or the warranty will be null and void. Do not return equipment for warranty or
repair service until proper shipping instructions are received from the factory.
6.2.
TROUBLESHOOTING
Refer to Table 6-1 for troubleshooting suggestions. It has been found that in some cases it
may be necessary to power cycle an amplifier (turn DC power off and back on without RF
applied) to clear an alarm.
INDICATOR
LED STATUS
DC ON
Off
(Green)
On
LOW
On (all other
OUTPUT
alarm LEDs
(Red)
off)
On (together
with HIGH
VSWR alarm
LED)
HIGH VSWR
On
(Red)
OVER TEMP
On
(Red)
Copyright Crescend Technologies
Table 6-1. Troubleshooting
OUTPUT POWER STATUS
No power
Set power
Less than set power
Less than set power
Less than set power
16
POSSIBLE CAUSE
SUGGESTED ACTIONS
No voltage at unit
1.
Normal operation
1.
Frequency is out of
1.
range
The input power is
1.
below the low end of
the rated input range
Power supply voltage
1.
is too low
Problem inside
1.
amplifier
Output load VSWR is
1.
much above 2.5:1
2.
3.
Output load VSWR is
1.
above 2.5:1
2.
3.
Fan is not rotating
1.
2.
3.
Power supply voltage
1.
is too low causing
insufficient air flow
Operating
2.
temperature of
amplifier is exceeding
safe level. Note:
3.
When unit cools, LED
turns off and output
returns to rated power
4.
040003A005 Rev 1
Check power supply voltage
No action required
Check frequency
Check input power
Check power supply voltage
at amplifier DC connector
during key-up
Send the unit back to factory
Turn off amplifier (or remove
RF input)
Check output connections
and cables for integrity and
tightness
Check antenna, combiner,
etc. for proper return loss
Turn off amplifier (or remove
RF input)
Check output connections
and cables for integrity and
tightness
Check antenna, combiner,
etc. for proper return loss
Check if +13 VDC is present
across the FAN leads
Check if anything is
physically stopping rotation
If fan has failed, replace fan
with same or similar fan
Check power supply voltage
Make sure that air access to
front and rear of unit is
unimpeded (3 inches min)
Verify that air vents are
clear of dust and dirt and
that fan(s) are operating
properly. Replace fan if
necessary
Check ambient temperature
(not to exceed spec - see
Table 1-2)