Nautel FM10, Технические инструкции

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10 000 WATT FM BROADCAST TRANSMITTER
FM10
Page 5-1
01 October 2002
SECTION 5
SYSTEM LEVEL TROUBLE SHOOTING
GENERAL
5.1
This section contains scheduled and
corrective maintenance information for the subject
transmitter. Fault symptoms should be analyzed to
determine the corrective action required. Normally a
recalibration will resolve the apparent problem.
Trouble shooting information (see paragraph 5.11) is
presented based on the front panel alarm indication.
For quick reference to an offending alarm's trouble
shooting procedure or repair procedure, refer to the
table below:
PROCEDURE
PARAGRAPH
Trouble shooting:
RF Power/IPA Module Fault Isolation ............. 5.6
PA Fail Alarm ........................................... 5.11.1
Module RF Drive Alarm............................. 5.11.2
Module Temp Alarm ................................. 5.11.3
AC Phase Alarm ....................................... 5.11.4
High AC Pwr Alarm................................... 5.11.5
Low AC Pwr Alarm ................................... 5.11.6
Reflected Power Alarm ............................. 5.11.7
IPA Input Alarm ........................................ 5.11.8
IPA Output Alarm ..................................... 5.11.9
IPA SWR Alarm...................................... 5.11.10
IPA Temp Alarm ..................................... 5.11.11
PA VDC Fail Pwr Sply (A - F) Alarm ....... 5.11.12
Pwr Sply Fail IPA Alarm.......................... 5.11.13
Fan Fail Alarm........................................ 5.11.14
Rectifier Temperature Alarm ................... 5.11.15
Repair:
RF Power Amplifier Module Removal .......... 5.7.1
RF Power Amplifier Tuning ......................... 5.7.2
RF Power Amplifier Module Installation....... 5.7.3
IPA Replacement with RF Power Module ....... 5.8
Control/Monitor PWB Replacement/Adj.......... 5.9
Power Supply Control PWB Replacement .... 5.10
The FM10 transmitter contains many solid state
devices that may be damaged if subjected to
excessive heat or high voltage transients. Every
effort must be taken to ensure circuits are not
overdriven or disconnected from their loads while
turned on.
SCHEDULED MAINTENANCE
5.2
Scheduled maintenance consists of
performing a visual inspection of the transmitter at
scheduled intervals. The recommended minimum
time between scheduled maintenance visits is three
months. Local operating and environmental
conditions may dictate more frequent visits and in
remote sites, less frequent visits may be acceptable.
Experience and system reliability will determine the
most practical schedule for a specific installation.
CORRECTIVE MAINTENANCE
5.3
Corrective maintenance procedures consist
of identifying and correcting defects or deficiencies
that arise during operation of the subject transmitter.
Local/remote alarm signals will be generated when a
malfunction occurs. If the alarm condition was
caused by a malfunction in the RF power stage, the
integral modular reserve (IMR) feature will maintain
operation at a reduced RF output level. The nature
of the fault and station policy will dictate whether
immediate maintenance response is necessary. Fault
analysis and rectification may be conducted from
three different levels with a different technical
competence level required for each.
5.3.1 ON-AIR TROUBLE SHOOTING: On-
air trouble shooting can be performed from a remote
location or locally at the transmitter site.
5.3.1.1 `Remote Trouble Shooting:
Remote on-air trouble shooting consists of
monitoring the transmitter's radiated signal using an
on-air monitor and observing the status of remote
fault alarm indicators. The information obtained
from these sources should enable an operator to
decide if response may be deferred to a more
convenient time, if immediate corrective action must
be taken and/or whether the standby transmitter must
be enabled (if one is available). It is recommended
that the significance of remote indications and the
appropriate responses be incorporated into a station's
standard operating procedures. Refer to paragraph
5.11 and table 5-5 to determine the remedial action
required for a given fault.