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All voltages delivered from the LOW VOLTAGE and HIGH VOLTAGE SUPPLY PCBs, tubes currents,
temperatures and airflow cooling capability are permanently monitored. A lot of software-derived
protections are based on this information.
The SIGNAL FILTER PCB and RFC1 eliminate RF feedback from incoming cables, including the mains
power cord. The Remote Control Unit (RCU) is based on the same 80C31 microprocessor and uses a
dot-matrix back-lighted alphanumeric 40-character liquid crystal display.
Detailed electrical schematic diagrams are available in the TECHNICAL SUPPLEMENT to this manual.
Contact your dealer for details.
6-6. Troubleshooting
Should the RCU display indicate a problem, look up the message in the list below and before you
contact the service of your dealer(see S.1-2 and S.5-3), try the recommendations. The messages are
listed in an alphabetic order. The abbreviations used for some recommendations are decoded after the
list.
In case of necessity of transportation see S.7-3.
MESSAGE RECOMMENDATION
ADC - OVERFLOW OFF5*
ANTENNA CONTROL UNIT MALFUNCTION check the control cable from the amplifier IN-
TERFACE connector to ACU (Antenna Con-
trol Unit, if there is one).
ANTENNA RELAY CLOSED CCC*
IT SHOULD BE OPEN
ANTENNA RELAY OPEN CCC*
IT SHOULD BE CLOSED
ARC FAULT try again; check antenna cable, selector, an-
tenna and grounding for loose contacts or
worsened insulation.
AUTOMATIC PROTECTION power not removed more than 10 seconds af-
DRIVE POWER REMOVED ter the message "REMOVE AND REDUCE
DRIVE POWER" appeared.
BAND SWITCH SYSTEM MALFUNCTION OFF5*
BIAS CONTROL MALFUNCTION OFF5*; CCC*
BIAS TOO LOW AT POWER ON OFF5*; CCC*
BIAS VOLTAGE TOO LOW OFF5*; CCC*
COVER INTERLOCK OPEN Check cover; OFF5*
DETECTED RF POWER AT WRONG TIME Check if there is power in the antenna induced
from another nearby transmitter; CCC;OFF5*
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