76 Maintenance
8.3 Malfunction (effects, causes and solutions)
Effect Cause Solution
Transmitter does not turn on • Power cord defective or
missing
• Auxiliary power incor-
rect (MAINS LED on front
panel off)
• Fault in power stage
• Replace the cable or con-
nect to apparatus
• Call the manufacturer
• Call the manufacturer
Transmitter does not reach
the required power
• Transmitter in Stand By
• No interlock connection
(if TC/TS option)
• PLL not locked (ON AIR
LED on front panel off)
• Power supply fault
• RF module fault
• Measure point fault
• Set the transmitter in RF
ON
• Connect interlock connec-
tion
• Call the manufacturer
• Call the manufacturer
• Call the manufacturer
• Call the manufacturer
Transmitter transmits on a
frequency different from
required frequence
• PLL board fault
• VCO board fault
• Call the manufacturer
• Call the manufacturer
No modulation in output and
on display
• Absence or interruption
audio cables
• MPX board fault
• Stereo Coder board fault
• Modulation off
• Connect or change audio
cables
• Call the manufacturer
• Call the manufacturer
• Activate modulation by
related menù
No modulation in output, but
displayed
• MPX board fault
• Stereo Coder board fault
• Call the manufacturer
• Call the manufacturer
Modulation in output that not
reaches the desired value
• Low audio level input
• MPX board fault
• Increase source audio
level
• Increase ETG input sen-
sitivity or call the manu-
facturer
No stereo modulation • Stereo carrier off
• Absence or interruption
audio cables
• Stereo Coder board fault
• Absence Stereo Coder
board
• Turn on the stereo carrier
from the related menu
• Connect or change audio
cables
• Call the manufacturer
• Transmitter can not be
used for stereo broa-
dcasts
One or more fans stopped • Fans fault
• Fans power supply fault
• Call the manufacturer
• Call the manufacturer
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