Page 5-24 V10/V7.5/V5/V3.5 Installation and Operation Manual
Issue 3.5 Section 5 System Level Troubleshooting
NOTE
In a V10/V7.5, an IPA changeover affects
both the IPA module and its associated IPA
PS (i.e., they are ganged together). In a
V5/V3.5, however, the IPA PA and IPA PS
have independent changeover functions.
• IPA fault (dual IPA V10/V7.5 only): An
IPA changeover can occur if the active
IPA [A (A19) or B (A20)] fails due to an
IPA related fault, such as IPA Q3/Q4
Forward Low alarm. See the
applicable paragraph under IPA/PA
alarm (see 5.5.2) to troubleshoot.
• IPA PA fault (dual IPA PA V5/V3.5
only): An IPA PA changeover can
occur if the active IPA PA [A (A19A4)
or B (A19A3)] fails due to an IPA
related fault, such as IPA Forward
Low alarm. See the applicable
paragraph under IPA/PA alarm (see
5.5.2) to troubleshoot.
• IPA PS fault (dual IPA PS V5/V3.5
only): An IPA PS changeover can
occur if the active IPA PS [A (U1) or B
(U2)] fails due to an IPA PS related
fault, such as PS Temp alarm. See the
applicable paragraph under Power
Supply alarm (see 5.5.6) to
troubleshoot.
• A Fan PS fault (dual fan PS
transmitters only): A fan PS
changeover can occur if the active fan
PS [A (U13) or B (U14)] fails due to a
related fault, such as Fan PS Fail
alarm. See the applicable paragraph
under Low Voltage Power Supply
alarm (see 5.5.4) to troubleshoot.
To reset the Changeover alarm and clear
the front panel alarm lamp (off):
• In the Changeover menu, toggle the
indicated Main module [A or B of
exciter, IPA (V10/V7.5), IPA PA (V5/
V3.5), IPA PS (V5/V3.5), or Fan PS] to
match the current Active module
indicated in the Status bar (A or B).
5.5.8 External Alarms
5.5.8.1 Interlock Open Alarm
An Interlock Open alarm occurs if the
transmitter interlock is open. Check the
interlock connection at remote interface
PWB (A44) TB1-1 and 2. If intact, check
all interlock switches. Otherwise, it may be
a problem with the interlock circuitry for
either the remote interface PWB or
control/display PWB.
5.5.8.2 Remote PWB Offline Alarm
A Remote PWB Offline alarm occurs if
the control/display PWB (A43) is not
receiving communications from the
remote interface PWB (A44). If the remote
interface PWB is receiving data updates
from the control/display PWB, the Valid
Data Status output (J4-26) on the remote
interface PWB is a current-sink-to-ground.
If the remote interface PWB is not
receiving communication from the control/
display PWB, Valid Data Status output
switches to an open collector. Check the
cabling between the control/display PWB
and the remote interface PWB. Check the
supply voltages applied to both PWBs.
5.5.9 EEPROM Alarms
If an EEPROM Fail Cal, EEPROM Fail
Thresh,
EEPROM Fail Meters, or
EEPROM Fail Presets alarm is displayed
on the GUI’s Events Log, enter the
associated GUI screen [Calibrate Meters
(see 3.6.12.3) for EEPROM Fail Cal,
Setup Thresholds (see 3.6.12.6) for
EEPROM Fail Thresh, Meters Presets
(see 3.6.8) for EEPROM Fail Meters and
Presets (see 3.6.4) for EEPROM Fail
Presets) and press Save. Contact Nautel
if the problem persists.
5.6 FAN REMOVAL/REPLACEMENT
When a fan is found to be defective,
remove it and replace it with a functional
fan as follows:
5.6.1 RF Power Module Fan
If replacing an RF power module fan,
perform the following steps:
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