Nautel GV40, GV30 Troubleshooting Manual

4: TROUBLESHOOTING MANUAL

GV40/GV30

T

RANSMITTER

Making Digital Radio Work

Document ID: NHB-GV30-GV40-TRB
Version: 4.0
Issue Date: 2018-02-26
Status: Standard

GV40/GV30 TROUBLESHOOTING MANUAL

Contact Information

Nautel Limited

10089 Peggy’s Cove Road
Hackett’s Cove, NS Canada B3Z 3J4

Toll Free: +1.877.6NAUTEL (662.8835)

(Canada & USA only) or
Phone: [phone] or
Fax: [phone]

Nautel Inc.

201 Target Industrial Circle
Bangor, Maine USA 04401

Phone: [phone]
Fax: [phone]

Customer Service (24-hour support)

+1.877.628.8353 (Canada & USA only)
+1.902.823.5100 (International)

Email: [e-mail]
Web: www.nautel.com

The comparisons and other information provided in this document have
been prepared in good faith based on publicly available information.
For verification of materials, the reader is encouraged to consult the
respective manufacturer's most recent publication on the official
website or through contact with Customer Service.

© Copyright 2018 NAUTEL. All rights reserved.

VERSION 4.0 2018-02-26 PAGE III

GV40/GV30 TROUBLESHOOTING MANUAL TABLE OF CONTENTS

CONTENTS

Contact Information iii

RELEASE CONTROL RECORD vii

Responding to alarms 1-1

Corrective Maintenance 1-1

Electrostatic Protection 1-3

Identifying an Alarm 1-4

Accessing the Inside of the Transmitter 1-32

Troubleshooting Tips 1-33

Replacement Procedures 1-43

RF Power Module Replacement 1-44

Troubleshooting RF Power Modules 1-46

Remote Interface PWB Replacement 1-53

Cooling Fan Replacement 1-55

Reject Load or Reject Load/Splitter Interface Assembly Replacement 1-57

Controller Replacement 1-60

Single-Board Computer (SBC) Replacement 1-62

Controller PWB Replacement - Controller 1-65

Exciter Replacement 1-67

Exciter/Control PWB Replacement - Exciter 1-69

Pre-Amplifier PWB Replacement - Exciter 1-72

Module Control/Interface PWB Replacement 1-75

Power Supply Interface PWB Replacement 1-78

UPS Interface Power Supply Replacement 1-79

Power Module Combiner PWB (NAPH06) Replacement 1-81

Power Module Combiner PWB (PR82C) Replacement 1-84

VERSION 4.0 2018-02-26 PAGE 4.V

GV40/GV30 TROUBLESHOOTING MANUAL TABLE OF CONTENTS

Parts Lists 2-1

Family Tree 2-1

How to Locate Information About a Specific Part 2-1

Column Content 2-2

Wiring/connector lists 3-1

Wiring Lists Provided 3-1

Wiring Lists Not Provided 3-1

Connector Mating Information 3-1

Wire Colours 3-1

Printed Wiring Board Patterns 3-1

Reading Electrical Schematics 4-1

Component Values 4-1

Graphic and Logic Symbols 4-1

Reference Designations 4-1

Unique Symbols 4-2

Identifying Schematic Diagrams 4-2

Structure of Schematics 4-3

Locating Schematic Diagram(s) for a Functional Block 4-3

Locating a Part or Assembly on a Schematic 4-4

Mechanical Drawings 5-1

Identifying Mechanical Drawings 5-1

Content of Mechanical Drawings 5-1

Locating a Part or Assembly on a Mechanical Drawing 5-1

List of terms 6-1

PAGE 4.VI VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL

RELEASE CONTROL RECORD

ISSUE DATE REASON

4.0 2018-02-26 Release 4 of GV40/GV30 (NARF75C/02). Supports software
version GV SW 4.4.1 or later.

VERSION 4.0 2018-02-26 PAGE 4.VII

GV40/GV30 TROUBLESHOOTING MANUAL

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

SECTION 4.1: RESPONDING TO ALARMS

This section provides instructions you need when performing troubleshooting on the GV40/GV30
transmitter. This section includes the following topics:

 Corrective Maintenance

 Electrostatic Protection - see page 4.1.3

 Identifying an Alarm - see page 4.1.4

 Accessing the Inside of the Transmitter - see page 4.1.32

 Troubleshooting Tips - see page 4.1.33

 Replacement Procedures - see page 4.1.43

If none of the procedures and alarms described in this section address your problem, contact Nautel for
assistance. See “Technical Support” in the Pre-Installation Manual.

Corrective Maintenance

Corrective maintenance procedures consist of identifying and correcting defects or deficiencies that
arise during transmitter operation. Local and/or remote alarm signals are generated when a
malfunction occurs. If an alarm condition is caused by a malfunction in the RF power stage, the
transmitter may maintain operation at a reduced RF output level. The nature of the fault – and station
policy – will dictate whether an 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: on-air troubleshooting, remote or local, and off-air troubleshooting.

CAUTION! The transmitter contains many solid state devices that may be damaged

if subjected to excessive heat or high voltage transients. Take every effort to ensure
that circuits are not overdriven or disconnected from their loads while turned on.

On-Air Troubleshooting

On-air troubleshooting can be performed from a remote location, or locally at the transmitter site.

VERSION 4.0 2018-02-26 PAGE 4.1.1

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Remote Troubleshooting

Remote on-air troubleshooting consists of monitoring the transmitter's radiated signal using an on-air
monitor or via a LAN connection, and observing the status of each remote fault alarm indicator.
Information obtained from these sources should enable an operator to decide whether an alarm
response may be deferred to a more convenient time, an immediate corrective action must be taken, or
if a 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 “Identifying an Alarm” on page 4.1.4 to determine the remedial action required for
a given fault.

Local Troubleshooting

Local on-air troubleshooting consists of monitoring the transmitter's integral meters and fault alarm
indicators. Analysis of this data will normally identify the type of fault, and in most cases will determine
what corrective action must be taken. Refer to “Identifying an Alarm” on page 4.1.4 to determine the
remedial action required for a given fault.

The power amplifier stage contains an integral modular reserve (IMR) feature. This feature permits the
transmitter to operate at a reduced RF output level when a malfunction occurs in one of its power
modules. Station operating procedures will dictate whether a reduced RF output level is acceptable.
When a reduced RF output level can be tolerated, replacement of the defective RF power module may
be deferred to a convenient time.

A defective RF power module may be removed from the transmitter for servicing, while the transmitter
is operating, provided that the conditions in the removal instructions detailed in “Removing an RF Power

Module” on page 4.1.44 are met.

Off-Air Troubleshooting

Off-air troubleshooting must be performed when the replacement of a defective RF power amplifier
module, or routine on-air calibration adjustments, will not restore operation.

It is recommended that the transmitter’s output be connected to a precision 50  resistive dummy load
(rated for at least the maximum transmitter power rating) before starting off-air troubleshooting
procedures. If an appropriate dummy load is not available, troubleshooting for a majority of faults can
be performed with RF power stage turned off. The transmitter may remain connected to its antenna
system for these procedures.

NOTE: Reduce the RF output level to a minimal value when troubleshooting faults in the power

amplifier stage while the transmitter’s RF output is connected to the antenna system.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Electrostatic Protection

The transmitter's assemblies contain semiconductor devices that are susceptible to damage from
electrostatic discharge. The following precautions must be observed when handling an assembly which
contains these devices.

CAUTION! Electrostatic energy is produced when two insulating materials are

rubbed together. A person wearing rubber-soled shoes, walking across a nylon
carpet or a waxed floor, can generate an extremely large electrostatic charge. This
effect is magnified during periods of low humidity. Semiconductor devices such as
integrated circuits, field-effect transistors, thyristors and Schottky diodes may be
damaged by this high voltage unless adequate precautions are taken.

Electrical Discharging of Personnel

Personnel should be electrically discharged by a suitable grounding system (e.g., anti-static mats,
grounding straps) when removing an assembly from the transmitter, and while handling the assembly
for maintenance procedures.

Handling/Storage

An assembly should be placed in an anti-static bag when it is not installed in a host transmitter, or
when it is not undergoing maintenance. Electronic components should be stored in anti-static
materials.

Tools/Test Equipment

Testing and maintenance equipment – including soldering and unsoldering tools – should be suitable
(i.e., grounded tip) for contact with static sensitive semiconductor devices.

Stress Current Protection

Every precaution should be taken to ensure the static sensitive semiconductor devices are protected
from unnecessary stress current. This is achieved by ensuring that current is not flowing when an
electrical connection is broken, and that voltages are not present on external control/monitoring circuits
when they are connected.

VERSION 4.0 2018-02-26 PAGE 4.1.3

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Identifying an Alarm

You can identify an alarm locally by viewing the local or remote AUI’s Transmitter Status page (see

“AUI Transmitter Status Page Checks”). As a backup option, you can also view the front panel of the

controller module (A4) (see “Controller Module Front Panel Alarm Checks” on page 4.1.7).

AUI Transmitter Status Page Checks

If an alarm exists and is being recognized by the transmitter (i.e., the Status button at the bottom of
the AUI display will be red), it is displayed on the transmitter status page (see Figure 4.1.1 on page

4.1.5). The Device name indicates the sub-system origin of the alarm. The sub-systems that can be

displayed are:

 Controller: All alarms in this sub-system apply to the controller.

 Exciter A or B: All alarms in this sub-system apply to an exciter (A or B).

 Rack #: All alarms in this sub-system apply to a rack (cabinet) (4 for GV40/GV30).

 RF Module #: All alarms in this sub-system apply to a specific RF power module (1 through 16)

PAGE 4.1.4 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Figure 4.1.1: Transmitter Status Page

1. Click the Status button to go to the Transmitter Status page (see Figure 4.1.1). View the list of
active faults. Alarms are listed by their origin (Device column), then by name (Alarm column), and
then by severity (Level column) [single orange ! indicates low severity (RF output not affected);
single red ! indicates medium severity (RF output is reduced); two red ! indicates high severity (RF
output is inhibited)].

2. Attempt to clear any latching alarms by pressing the Reset button on the bottom banner of the
page. If the alarm persists, it will not be cleared from the display.

3. Locate the alarm name in Table 4.1.1 on page 4.1.10 to determine the cause of the alarm and
perform any recommended procedures in the Description and Troubleshooting Action column.
This may also lead to replacing a suspect PWB, power supply or fan, as detailed in “Replacement

Procedures” on page 4.1.43.

VERSION 4.0 2018-02-26 PAGE 4.1.5

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

NOTE: Table 4.1.1 on page 4.1.10 contains a column for most Alarms that can occur, sorted

alphanumerically for each sub-system, including both the names displayed on the AUI and, if different,
the controller UI (in parentheses). The Description and Troubleshooting Action column provides a
brief description of the alarm, troubleshooting tips and a cross-reference to more detailed
troubleshooting, as applicable.

4. If troubleshooting and subsequent replacement of a suspect PWB or module causes the alarm to
disappear from the Transmitter Status page, the alarm has been successfully cleared. If the fault
condition does not clear, contact Nautel.

NOTE: Before undertaking any troubleshooting, record all AUI meter readings and note if any other

alarms are displayed on the Transmitter Status page. Record all alarms. The most convenient way to
do this is by using the remote AUI’s User Settings -> Critical Parameters page to capture and copy all
alarms (see “Capturing Critical Parameters” on page 3.2.147 of the Operations & Maintenance Manual).
Another method is to use a web browser over a LAN connection to save screen shots of critical status,
meter and alarm pages. From the Meter List View page, press the information (i) button for each sub­device (Controller, Exciter, Rack and Modules) to view (and save) detailed information (see “Viewing

Real-Time Meters - using the AUI” on page 3.2.51 of the Operations & Maintenance Manual).

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Exciter

Power Amplifier

Output Network

Power Supply

Controller Module Front Panel Alarm Checks

There two ways to check for alarms on the front panel:

 Alarm/Status LEDs

 View Alarms Screen - see page 4.1.8

Alarm/Status LEDs

There are four LEDs on the left-hand side of the LCD display that provide information about the
operational status of various sections of the transmitter - Exciter, Power Amplifier, Output Network
and Power Supply (see Figure 4.1.2). The LEDs can glow green, amber or red. Typically, green indicates
normal operation, amber indicates a warning, and red indicates a fault or error.

Figure 4.1.2: Controller Module Alarm/Status LEDs

When an LED is:

 Green - transmitter is on, with no known faults.

 Amber - a fault is present that may cause a reduction in RF power, but the transmitter is still

producing RF power.

 Red - a fault is present and the transmitter is not producing RF power.

When a fault is present, the transmitter may still produce an RF output. In this case, or if the transmitter
has shut down, you should schedule and commence more in-depth fault diagnosis. See “View Alarms

Screen” on page 4.1.8.

VERSION 4.0 2018-02-26 PAGE 4.1.7

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

View Alarms Screen

If an alarm exists and is currently being recognized by the transmitter system, it is displayed in the View

Alarms

screen (Main Menu -> View Status -> View Alarms) of the controller UI display (see

Figure 4.1.3).

Figure 4.1.3: View Alarms Screen

1. Scroll through the View Alarms screen to view the active faults.

2. Attempt to clear any latching alarms by pressing the checkmark button in the Main Menu ->

Reset Alarms

screen. If the alarm persists, it will not clear from the display.

3. Locate the alarm name in Table 4.1.1 on page 4.1.10 to determine the cause of the alarm and
perform any recommended procedures in the

Description and Troubleshooting Action column.

This may also lead to replacing a suspect PWB, power supply or fan, as detailed in “Replacement

Procedures” on page 4.1.43.

NOTE: Before undertaking any troubleshooting, record all meter readings and note if any other alarms

are displayed on the

NOTE: Table 4.1.1 on page 4.1.10 contains a column for most Alarms that can occur, sorted

View Alarms page. Record all alarms.

alphanumerically for each sub-system, including both the names displayed on the AUI and, if different,
the controller UI (in parentheses). The Description and Troubleshooting Action column provides a
brief description of the alarm, troubleshooting tips and a cross-reference to more detailed
troubleshooting, as applicable. The Front Panel LED (color) column gives a brief description of the
severity of the alarm recorded by the Controller/Exciter. Green indicated operational with no faults,

Amber indicates a non-critical fault and Red indicates an inhibiting fault.

4. If troubleshooting and subsequent replacement of a suspect PWB or module causes the alarm to
disappear from the View Alarms screen, the alarm has been successfully cleared. If the fault
condition does not clear, contact Nautel.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Exciter Front Panel Alarm Checks

There are two LEDs on the left-hand side of the Exciter that provide information about its operational
status - Power and Status (see Figure 4.1.4). The Power LED will illuminate green when a valid LVPS
input voltage is applied to the A2J1 connector and +5V is present to power the LED. The tri-color Status
LED can be green, amber or red and be solid or blinking.

When the Status LED is:

 Green (solid) - exciter is operational, with no known faults

 Amber (solid) - controlled inhibit

 Red (solid) - inhibiting fault

 Green/Amber (blinking) - exciter is operational with non-critical faults

 Green/Red (blinking) - exciter is operational with critical faults

 Amber/Red (blinking) - inhibiting fault (latching)

Figure 4.1.4: Exciter Front Panel

VERSION 4.0 2018-02-26 PAGE 4.1.9

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Table 4.1.1: Troubleshooting Alarms

Device and
Alarm Name
(AUI, UI)

Controller: AC
Summary (AC Summ)

Controller: All PAs
Inactive

Controller: Audio Loss
Summary

Controller: Auto
Changeover Occurred
(Auto Changeover)

Controller:
Changeover in
Progress (In
Changeover)

Controller Front
Panel LED (color)

- Not displayed in AUI or UI status. Configurable as a remote output. This

Power Amplifier (red) This alarm indicates that all of the transmitter’s power amplifiers are

Exciter (red) Not displayed in AUI or UI status. Configurable as a remote output. This

Exciter (amber) This alarm occurs when the controller has initiated an exciter changeover to

Exciter (red) This alarm occurs only while an exciter changeover is in progress. It will

Description and Troubleshooting Action

alarms occurs if there are any ac input related alarms present. Check for
other specific ac fault alarms.

inactive due to external conditions such as ac loss, removal of power supply
modules or RF power modules, or faults in the power supply modules or RF
power modules. If there are power supply module or RF power module
related alarms present, follow the associated troubleshooting procedure.

alarms occurs if there are any audio loss alarms present. Check for specific
audio loss alarms and troubleshoot accordingly. Ensure the preset audio
settings agree with the audio being applied to the exciter.

the standby exciter, due to a possible fault with the main exciter.

clear once the changeover is complete.

Controller: Combiner
Match

Controller: Config File
Not Found (Cfg File
Not Found)

Controller: CPLD
Version Mismatch
(CPLD Ver Mismatch)

Controller: Current
Imbalance

Output Network (red) This alarm occurs if there is an excessive amount of power in the transmitter

combining stage that cannot be accounted for. This may be the result of a
fault in the combiner.

Exciter (red) This alarm occurs when the controller does not find a valid configuration file

to load at power-up. This alarm is unlikely, but may occur during
replacement of a controller module. It clears when the correct settings are
entered.

Exciter (red) This alarm occurs when there is an incompatible software release in the

controller module’s CPLD. Update the software to clear the fault.

Output Network (red) This alarm occurs if the Combiner Match alarm occurs due to a PA current

imbalance in the RF power modules

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: Cutback
Active

Controller: Digital
Player Audio Low

Controller:
Discharging PA Volts
(Discharging PA V)

Controller Front
Panel LED (color)

Output Network
(amber)

Exciter (red) This alarms occurs if the audio player is in use on the SBC, but no digital

PS (red) This alarm occurs when the transmitter has initiated a shutback sequence,

Description and Troubleshooting Action

This alarm occurs whenever the transmitter experiences a cutback. A
cutback (reduction in power) occurs when repeated shutback alarms occur
within a prescribed time period. Shutbacks occur when the transmitter's
peak reflected power exceeds 2:1 due to a transient SWR condition (arc or
lightning) within the output transmission line or antenna system. The
transmitter shuts back and recovers to a series of cutback levels (depending
on the severity of the alarm), with each level being a 15% reduction in
power from the power attained before the last shutback. Inspect the output
transmission line for punctures or damage. After repairing damage, or if no
damage is found, attempt to reset the latched condition.

audio is detected by the controller.

and residual PA voltage energy stored in the capacitors in the power
supplies and PAs is being discharged. During a shutback sequence, the RF
drive to the PAs is turned off immediately after the event, and this occurs
faster than the power supply modules can be inhibited. Therefore, PA
voltage is still being applied to the capacitors with no drive to discharge the
energy. To discharge the stored energy from the capacitors, the PA bias is
increased to a discharge level after the power supplies have been inhibited.
This causes the stored energy to be dissipated through dc current in the FET.
This alarm should only occur with a Residual PA Volts Present alarm. See
Residual PA Volts Present alarm for more information.

Controller: Door Open Exciter (amber) This alarm occurs if the transmitter’s front door is open, which inhibits the

monitor cooling fans.

Controller: Entered
Firmware Upgrade
(Entr Firmware Upgr)

Controller: Exciter A
or B Offline

Controller: Exciter
Audio Reset

Exciter (red) This alarm occurs when the transmitter is in “firmware upgrade” mode. It

should only be displayed during a transmitter software upgrade.

Exciter (red) This alarm occurs if the serial communication fails between the controller

and the exciter, or a problem has occurred with the exciter. Check all
connections to the exciter and make sure that its controller front panel
power LED is on.

Exciter (red) This alarms occurs if the audio processing within the exciter required a

reset. if this alarm is re-occurring, replace the controller (see

“Controller

Replacement” on page 4.1.60).

Controller: Exciter
Summary (Exciter
Summ)

VERSION 4.0 2018-02-26 PAGE 4.1.11

Exciter (amber) This alarms occurs if there are any exciter related alarms present. Check for

specific exciter related alarms.

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: External
Interlock Open
(External Interlock)

Controller: External
Summary

Controller: Fan Fail Output Network

Controller: Final
Reject Fan 1 - 3 Fail
(Final Rej Fan1-3 Fail)

Controller Front
Panel LED (color)

Exciter (red) The external interlock input wired to the controller (A4) or optional remote

- Not displayed in AUI or UI status. Configurable as a remote output.This

(amber)

Output Network
(amber)

Description and Troubleshooting Action

interface PWB (A16), if used, is open. Check the interlock connection
between REMOTE I/O-A pins 19 and 20 on the controller (verify a ground
potential at pin 19) or optional remote interface PWB J2 pins 19 and 20 or
TB1-1 and 2. If the interlock is intact, check all external interlock switches.
Otherwise, suspect a problem with the interlock circuitry on the controller
or optional remote interface PWB.

alarms occurs if there are any external related alarms present. Check for
specific external related alarms and troubleshoot accordingly.

This is an indicational alarm only that is displayed when the controller’s
cooling fan has been enabled and the speed of the fan is below 2000 RPM.

This alarm occurs if the final reject load (A52) cooling fans are enabled and
the speed of a cooling fan [B10 (1), B11 (2) or B12 (3)] is below 2000 RPM.
Final reject load cooling fans are enabled only when the reject load power is
greater than 300 W, possibly due to an RF power module removal or failure.

Inspect the fan and, if necessary, replace it (see

“Cooling Fan

Replacement” on page 4.1.55).

Controller: Forward
Power Limiting (Fwd
Power Limiting)

Controller: Forward
Power Shutdown
(Fwd Power
Shutdown)

Controller: High
Forward Power (High
Fwd Power)

Controller: High
Reflected Summary

Output Network
(amber)

Output Network (red) This alarm occurs if the transmitter tries to reduce the forward power below

Output Network
(amber)

Output Network
(amber)

When the High Forward Power alarm is active, this alarm occurs if the high
forward power limiting threshold is exceeded [1.063 times the maximum
power setting for all modes; e.g., 46,772 W (GV40) or 35,080 W (GV30) for
FM mode]. The transmitter will fold back the forward power each time the
threshold is exceeded. This alarm occurs only if the controller ALC cannot
respond fast enough to transmitter load changes. Suspect the module
control/interface PWB (A3).

minimum due to repeated Forward Power Limiting alarms. The transmitter
latches off. See Controller: Forward Power Limiting for troubleshooting tips.

This alarm occurs if the transmitter’s average forward power exceeds the
high forward power threshold [1.036 times the maximum power setting for
all modes; e.g., 45,584 W (GV40) or 34,188 W (GV30) for FM mode]. This
alarm occurs only if the controller ALC cannot respond fast enough to
transmitter load changes. Suspect the module control/interface PWB (A3).

Not displayed in AUI or UI status. Configurable as a remote output.This
alarms occurs if there are alarms present that are related to high reflected
power on the transmitter’s RF output. Check for specific reflected power
related alarms and troubleshoot accordingly.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: High
Reject Power (High
Reject)

Controller: High RF
Drive

Controller: High SWR Output Network

Controller: High SWR
Shutdown

Controller: High
Temperature
Summary

Controller Front
Panel LED (color)

Output Network
(amber)

Exciter (red) This alarm occurs if the RF drive power from the exciter is greater than the

(amber)

Output Network (red) This alarm occurs if the transmitter tries to reduce the forward power below

- Not displayed in AUI or UI status. Configurable as a remote output.This

Description and Troubleshooting Action

This alarm occurs if any of the transmitter’s reject loads’ average power
exceeds the high reject power threshold (1200 W). Typically, high reject
power is a result of RF power module failure or removal, or PA power supply
failure or removal.

high threshold (45% above the setpoint). This may be the result of a
calibration problem with either the exciter or the transmitter RF drive
sample. Check all connections to the exciter.

This alarm occurs if the transmitter's average reflected power exceeds the
high SWR threshold (1120 W). The GV40/GV30 takes no action on this
alarm. Inspect the antenna and transmission line system for damage or de­tuning.

a level that is equivalent to a 3:1 VSWR (user-configurable) at the SWR
Foldback threshold due to a gradually degrading load match. This alarm
causes the transmitter to latch off. Inspect the antenna and transmission
line system for damage or de-tuning.

alarms occurs if there are high temperature related alarms occurring. Check
for specific temperature related alarms and troubleshoot accordingly.

Controller: Host
Network Down

Controller: Host Not
Booted

Controller: Host Not
Responding

Exciter (amber) This alarm indicates that the microcontroller that runs the remote

interfacing applications is unable to acquire an IP address. When this alarm
is present, it will not be possible to access any of the remote AUI
functionality. Check that the Ethernet cable is properly connected to A1J8A
(LAN) on the rear of the transmitter. If the alarm is still present see

“Network Setup” on page 3.2.159 of the Operations and

Maintenance Manuals for information on setting up the network
connection. Disable the alarm by setting DHCP to OFF and setting the IP
Address to all zeroes (i.e. 0.0.0.0).

Exciter (amber) This alarm indicates that the controller’s host has not finished booting. The

remote AUI will not yet be available. This alarm normally occurs with an ac
loss or software upgrade. It will clear when the host completes booting.

Exciter (red) This alarm indicates that the controller’s host is not communicating with the

rest of the transmitter. If the watchdog function is enabled, the DSP will
automatically reset the host. If this alarm persists, the controller may
require reprogramming or replacement. If necessary, replace the single

board computer (A4A1) (see

“Single-Board Computer (SBC)

Replacement” on page 4.1.62).

VERSION 4.0 2018-02-26 PAGE 4.1.13

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: Local UI
Failure (UI Failure)

Controller: Low AC
Operation

Controller: Low
Battery

Controller: Low
Battery/Memory
Summary

Controller: Low
Efficiency

Controller Front
Panel LED (color)

Exciter (red) This alarm occurs if there is a fault with the LCD user interface (UI),

Power Supply (red) This alarm occurs if the ac input voltage is less than 175 V ac, but greater

Exciter (amber) This alarm occurs if the backup battery voltage falls below an acceptable

Power Supply (red) Not displayed in AUI or UI status. Configurable as a remote output.This

Output network
(amber)

Description and Troubleshooting Action

preventing it from being used to control the transmitter. The transmitter will
automatically switch to remote control mode to allow use of the AUI or
digital I/O.

than 90 V ac. Transmitter RF output power will be limited to approximately
33% of maximum power or to the current setpoint, whichever is less.

level (2.7 V). The GV40/GV30 takes no action on this alarm. Use a digital
multimeter to measure the battery voltage (with ac power on). If the battery
voltage is low, replace the battery. If battery voltage is OK, cycle ac power
(off, then on). If the alarm does not clear, check the controller PWB (A4A2).

alarms occurs if there is a specific battery or memory related alarm present.
Check for specific alarms and troubleshoot accordingly.

This alarm occurs in conjunction with the Combiner Match alarm to indicate
that the transmitter is exhibiting low Dc-RF efficiency.

Controller: Low
Forward Power (Low
Fwd Power)

Controller: Low RF
Drive

Controller: LVPS Fail Power Supply (red) This alarm occurs if the LVPS voltage is less than 36 V or greater than 53 V.

Output Network
(amber)

Exciter (red) This alarm occurs if the RF drive power from the exciter is less than the low

This alarm occurs if the transmitter’s average forward power is below the
low forward power threshold (defaulted to 50% of the setpoint and is user
adjustable). Check for associated alarms and follow the associated
troubleshooting procedure, if applicable.

threshold (70% of the setpoint). This may be the result of a calibration
problem with either the exciter or the transmitter RF drive sample. Check all
connections to the exciter. Check the RF drive connection between the
exciter RF output and the RF drive splitter input.

This may be a result of an ac power failure or an LVPS fault. Check the dc
output voltage of the suspect LVPS. If the dc voltage is out of tolerance,

replace the LVPS module (see

“LVPS / Power Supply Module

Replacement” on page 4.1.50). If the dc voltage is acceptable, suspect

the controller.

Controller: LVPS
Shutback

Power Supply (red) This alarm occurs if the LVPS voltage decreases below 36V while the

transmitter is RF on. It will not clear until the LVPS voltage increases above
37V. This alarm triggers to turn off power to the fans to prevent power
fluctuations that may cause lock ups on the module control/interface PWB.
If the transmitter is connected to a UPS, the controller and remote AUI will
still be accessible. Check all LVPS connections and the LED status on UG92*
power supplies.

PAGE 4.1.14 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller:
Maintenance
Required Summary

Controller: Missing
Preset

Controller: Mode/
Frequency Mismatch
(Mode/Freq
Mismatch)

Controller: Monitor
Fan Fail

Controller: Off-Air
Summary

Controller Front
Panel LED (color)

- Not displayed in AUI or UI status. Configurable as a remote output.Check

Exciter (red) This alarm indicates that there are no presets programmed into the

Exciter (red) This alarm occurs if there is a mismatch between the operating mode or

Exciter (amber) This alarm occurs if the controller has activated the monitor cooling fans

- Not displayed in AUI or UI status. Configurable as a remote output. This

Description and Troubleshooting Action

for related alarms and troubleshoot accordingly.

transmitter. The user will not be able to enable RF without first
programming a preset.

carrier frequency of the transmitter and one or more of the associated
exciters. Suspect a possible communication problem between the controller
and exciter(s). The alarm should clear once the transmitter transfers the
preset settings to the exciter.

and one or both of the monitor cooling fans’ tachometer measurement is
below 2000 RPM. The front door must be closed (i.e., fans enabled) for this
alarm to display.

alarms occurs if there are any alarms present that cause the transmitter to
be in an RF off state. Check for associated alarms, and follow the associated
troubleshooting procedure, if present.

Controller: Output
Network Summary

Controller: Overall
Summary

Controller: PA Pwr
Foldback (Per PA
Foldback)

Controller: Power
Amplifier Summary

Output Network
(amber)

- Not displayed in AUI or UI status. Configurable as a remote output.This

Output Network
(amber)

- Not displayed in AUI or UI status. Configurable as a remote output. This

Not displayed in AUI or UI status. Configurable as a remote output.This
alarms occurs if there are any alarms present that are related to the output
network of the transmitter. Check for associated alarms, and follow the
associated troubleshooting procedure, if present.

alarms occurs if there are any controller related alarms present.Check for
associated alarms, and follow the associated troubleshooting procedure, if
present.

This alarm occurs if the control system determines that the calculated
dissipation in any FET on a PA is above the high dissipation threshold
(350 W), or the forward power being requested from an individual PA
[calculated as output power - combiner losses] is greater than the PA
output high threshold (850 W). The forward power of the transmitter will be
limited to a level such that neither of these thresholds are exceeded. Check
for associated alarms. Typically, the assertion of this alarm is the result of a
PA failure or RF power module removal, or a high SWR condition.

alarms occurs if there are any alarms present that are related to the power
amplifiers. Check for associated alarms, and follow the associated
troubleshooting procedure, if present.

VERSION 4.0 2018-02-26 PAGE 4.1.15

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: Power
Discrepancy

Controller: Power
Supply Summary

Controller: PS Current
Foldback (PS Curr
Foldback)

Controller: Rack #
Fault

Controller: Rack 1- 4
Offline (Rack #
Offline)

Controller Front
Panel LED (color)

Output Network
(amber)

- Not displayed in AUI or UI status. Configurable as a remote output. This

Power Supply (amber) This alarm occurs if the transmitter is limiting its output power to avoid

Power Amplifier (red) This alarm indicates that a critical fault has occurred in the associated rack,

Power Amplifier (red) This alarm occurs if serial communication is lost with the associated rack

Description and Troubleshooting Action

This alarms occurs in conjunction with the Combiner Match alarm to
indicate unaccounted for RF power in the combiner.

alarms occurs if there are any alarms present that are related to the power
supplies. Check for associated alarms, and follow the associated
troubleshooting procedure, if present.

drawing excessive current (48 A per supply) from the power supply
modules. This may occur when there are PA failures and the transmitter is
attempting to compensate to attain the setpoint level. Check for associated
alarms, and follow the associated troubleshooting procedure if present.

resulting in the transmitter’s RF output being inhibited. Check for
associated alarms to continue troubleshooting.

controller (module control/interface PWB). This will inhibit the transmitter’s
RF output, since this connection is used for monitoring power and adjusting
the PA voltage. Check all connections between the controller and the rack.
If the alarm persists, suspect a fault with the associated rack’s controller
(module control/interface PWB).

Controller: Rack
Shutback

Controller: Rack 1-4
Sync Required

Controller: Rebooted
Exciter

Controller: Reboot
Required (Need
Reboot for Settings)

Power Amplifier (red) This alarm indicates a connection issue between the controller and the

(rack) module control/interface PWB(s), such that the “shutback” signal is
unavailable due to a hardware fault (typically, the 9-pin D-sub daisy-chain
cable is disconnected). In addition, a “Rack # Offline” alarm will also be
present to signify a communication loss between the controller and (rack)
module control/interface PWB(s).

Power Amplifier (red) This alarm indicates that the Rack data for scale factors or transmitter type

is out of sync with the Controller data. This condition is automatically
resolved based on the controller's internal rules for transmitter type
determination. This alarm will appear in the events log only, and the
customer does not need to take any action.

Exciter (red) This is an informational alarm only that is displayed when the watchdog

timer reboots the controller’s main microcontroller (DSP) or on an ac power
interruption.

Exciter (red) This alarm indicates that exciter setup changes have been made, typically

via the System Settings page of the AUI. Typically, the DSP will reboot itself
automatically; however, if this alarm persists for more than five minutes,
cycle the transmitter’s ac power (off, then on) to store the changes.

PAGE 4.1.16 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: Reduced
Power Summary

Controller: Reject
Foldback (Rej
Foldback)

Controller: Reject
Shutback

Controller: Residual
PA Volts Present
(Residual PA V Pres)

Controller Front
Panel LED (color)

Output Network
(amber)

Output Network
(amber)

Output Network (red)

Exciter (red) This alarm indicates that after the transmitter has turned off its RF output, it

Description and Troubleshooting Action

Not displayed in AUI or UI status. Configurable as a remote output. This
alarms occurs if there are any alarms present that caused the transmitter’s
RF output power to be reduced. Check for associated alarms, and follow the
associated troubleshooting procedure, if present.

This alarm occurs if any of the transmitter’s reject load
exceeds its reject power foldback threshold (1500 W). The transmitter’s
forward power will be reduced each time the alarm occurs, until the fault
clears. Typically, high reject power is a result of RF power module failure or
removal, or PA power supply failure or removal. Check for associated
alarms, and follow the associated troubleshooting procedure if present.

This alarm occurs if any of the transmitter’s reject load
exceeds its reject power shutback threshold (1800 W). The transmitter will
be shut back and attempt to find a safe operating power level by entering
reject foldback mode. Typically, high reject power is a result of RF power
module failure or removal, or PA power supply failure or removal. Check for
associated alarms, and follow the associated troubleshooting procedure if
present.

is unable to discharge the PA volts to a level that is below 10 V. This
condition will not allow the transmitter to turn on its RF output; however
the condition will be cleared once the PA volts reaches a level that is below
10 V. This condition will typically occur with a failed PA or power supply
module. Check for associated alarms and follow the associated
troubleshooting procedure.

’s’ average power

’s’ average power

Controller: RF
Spectrum Mask
Foldback

Controller: SC1
Interlock

Controller: Splitter
Fan 1/2 Fail

Output Network
(amber)

Exciter (red) This alarm occurs, for combined systems only, if the system controller (SC1)

Output Network
(amber)

This alarm occurs if the HD optimizer has decreased the transmitter’s RF
output power to ensure the spectrum passes the mask. Typically caused by
a degrading load impedance, PA or PS failures.

has inhibited the transmitter’s RF output due to a system interlock fault. See
the SC1 Technical Instruction Manual for more information.

This alarm occurs if the splitter’s fan 1/2 (B1/B2) speed is too low. This alarm
occurs if the RF drive splitter’s cooling fan has been enabled, but the fan
tachometer measurement is below 2000 RPM. The fan will be enabled if an
RF power module is removed, or the splitter reject power exceeds 100 W.

Inspect the fan and, if necessary, replace it (see

“Cooling Fan

Replacement” on page 4.1.55).

Controller: Splitter
Reject Foldback

(Split Rej Foldback)

Output Network
(amber)

VERSION 4.0 2018-02-26 PAGE 4.1.17

This alarm occurs if the reject power in the 40 kW splitter exceeds 200 W,
causing the exciter power to be reduced.

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: Standby
Exciter Test (Standby
Exc Test)

Controller: SWR
Foldback

Controller: SWR
Shutback

Controller Front
Panel LED (color)

Exciter (amber) This alarm occurs when a standby exciter test has been initiated by the user.

Output Network
(amber)

Output Network (red) This alarm occurs if the transmitter's reflected power exceeds the SWR

Description and Troubleshooting Action

Exciter changeovers are inhibited during a standby exciter test.

This alarm occurs if the transmitter's average reflected power exceeds the
SWR foldback threshold (1600 W for all modes) due to a gradually
degrading load match. The forward power of the transmitter will be limited
to a level such that this threshold is not exceeded. If the load match
improves while the transmitter is producing RF output, the forward power
will increase. If the transmitter encounters a 3:1 VSWR (user-configurable)
while in SWR foldback mode, an SWR Shutdown alarm occurs. Inspect the
antenna and transmission line system for damage or de-tuning.

shutback threshold (4800 W). The transmitter will shut back and attempt to
find a safe operating point by entering its SWR foldback mode. This may be
the result of a transient SWR condition (arc or lightning) within the output
transmission line or antenna system. Attempt to reset the latched condition

by pressing Reset [using the AUI’s Reset button (see

“Resetting Alarms”

on page 3.2.115 of the Operations and Maintenance Manual) or using

the controller UI (see

“Resetting Alarms - Using the Controller UI”

on page 3.2.113 of the Operations and Maintenance Manual)]. Inspect

the output transmission line and antenna for punctures or damage. If no
damage can be found, suspect the output power probe (A15). See also
Cutback Active alarm.

Controller:
Transmitter PA
Biasing

Controller: Turn On
Delay (Delaying Turn
On)

Controller: Very Low
Forward Power (Very
Low Fwd Power)

Controller: +1.2V Fail Power Supply (red) This alarm occurs if the +1.2 V supply in the controller is 10% higher or

- This is an informational alarm only that is displayed when the bias routine
has been initiated.

Exciter (red) This alarm occurs, if the turn-on delay function is enabled, and transmitter is

not permitted turn-on until the delay period elapses. The turn-on delay
function is enabled upon an ac power failure and is typically used to add
delay for use with an external generator.

Output Network
(amber)

This alarm occurs if transmitter’s average forward power is below the low
forward power threshold (defaulted to 12.5% of the setpoint and is user
adjustable). Check for associated alarms, and follow the associated
troubleshooting procedure, if present.

10% lower than its desired value. Check the output voltage of the LVPS
module. If necessary, replace the LVPS (see

“LVPS / Power Supply

Module Replacement” on page 4.1.50). There may also be a problem

with the controller’s power supply PWB.

PAGE 4.1.18 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: +1.8V Fail Power Supply (red) This alarm occurs if the +1.8 V supply in the controller is 10% higher or

Controller Front
Panel LED (color)

Description and Troubleshooting Action

10% lower than its desired value. Check the output voltage of the LVPS
module. If necessary, replace the LVPS (see

“LVPS / Power Supply

Module Replacement” on page 4.1.50). There may also be a problem

with the controller’s power supply PWB.

Controller: +3.3V Fail Power Supply (red) This alarm occurs if the +3.3 V supply in the controller is 10% higher or

10% lower than its desired value. Check the output voltage of the LVPS
module. If necessary, replace the LVPS (see

“LVPS / Power Supply

Module Replacement” on page 4.1.50). There may also be a problem

with the controller’s power supply PWB.

Controller: 10kW
Reject Fan 1 - 3 Fail
(10kW Rej Fan1-3
Fail)

Controller: +12V A
Fail

Output Network
(red)

Power Supply (red) This alarm occurs if the +12 V supply in the controller is 10% lower or 10%

This alarm occurs if the 10 kW reject load (A31) cooling fans are enabled
and the speed of a cooling fan [B4 (1), B5 (2) or B6 (3)] is below 2000 RPM.
10 kW reject load cooling fans are enabled only when the reject load power
is greater than 300 W, possibly due to an RF power module removal or
failure or power supply removal or failure. Inspect the fan and, if necessary,

replace it (see

higher than the desired value. Check the output voltage of the LVPS module.
If necessary, replace the LVPS (see

“Cooling Fan Replacement” on page 4.1.55).

“LVPS / Power Supply Module

Replacement” on page 4.1.50). There may also be a problem with the

controller’s power supply PWB.

Controller: +12V B
Fail

Power Supply (red) This alarm occurs if the secondary +12 V supply in the controller is 10%

lower or 10% higher than the desired value. Check the output voltage of
the LVPS module. If necessary, replace the LVPS (see

“LVPS / Power

Supply Module Replacement” on page 4.1.50). There may also be a

problem with the controller’s power supply PWB.

Controller: +15V Fail Power Supply (red) This alarm occurs if the +15 V power supply in the controller is 2 V higher or

2 V lower than the desired value. There may also be a problem with the
controller’s power supply PWB.

Controller: -15V Fail Power Supply (red) This alarm occurs if the -15 V power supply in the controller is 2 V higher or

2 V lower than the desired value. There may also be a problem with the
controller’s power supply PWB.

VERSION 4.0 2018-02-26 PAGE 4.1.19

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Controller: 5kW
Reject Fan 1 - 6 Fail
(5kW Rej Fan1-6 Fail)

Controller Front
Panel LED (color)

Output Network
(red)

Description and Troubleshooting Action

This alarm occurs if the 5 kW reject load (A29 or A50) cooling fans are
enabled and the speed of a cooling fan [B7 (1), B8 (2), B9 (3), B13 (4), B14
(5) or B15 (6)] is below 2000 RPM. 5 kW reject load cooling fans are
enabled only when the reject load power is greater than 300 W, possibly
due to an RF power module removal or failure. Inspect the fan and, if

necessary, replace it (see

“Cooling Fan Replacement” on

page 4.1.55).

Controller: +5V A Fail Power Supply (red) This alarm occurs if the +5 V supply in the controller is 10% lower or 10%

higher than the desired value. Check the output voltage of the LVPS module.
If necessary, replace the LVPS (see

“LVPS / Power Supply Module

Replacement” on page 4.1.50). There may also be a problem with the

controller’s power supply PWB.

Controller: +5V B Fail Power Supply (red) This alarm occurs if the secondary +5 V supply in the controller is 10%

lower or 10% higher than the desired value. Check the output voltage of
the LVPS module. If necessary, replace the LVPS (see

“LVPS / Power

Supply Module Replacement” on page 4.1.50). There may also be a

problem with the controller’s power supply PWB.

Exciter A/B: AES
Digital 1 Audio Low
(Dig 1 Aud Low)

Exciter (amber) This alarm indicates the Digital 1 input level is too low or is not applied. The

threshold and timing for this alarm can be adjusted in the Audio Low menu
in the user interface (see
of the Operations & Maintenance Manual.

“Setting User Thresholds” on page 3.2.181)

Exciter A/B: AES
Digital 2 Audio Low
(Dig 2 Aud Low)

Exciter A/B: Analog
Left (or Right) Low
(Anlg L or R Aud Low)

Exciter (amber) This alarm indicates the Digital 2 input level is too low or is not applied. The

threshold and timing for this alarm can be adjusted in the Audio Low menu
in the user interface (see
of the Operations & Maintenance Manual.

Exciter (amber) This alarm indicates the analog left or right audio input level is too low or is

not applied. The threshold and timing for this alarm can be adjusted in the
Audio Low menu in the user interface (see

“Setting User Thresholds” on page 3.2.181)

“Setting User Thresholds”

on page 3.2.181) of the Operations & Maintenance Manual.

Exciter A/B: Audio
Processor Offline
(Audio Proc Offline)

Exciter A/B: Audio
Processor Output Fail
(Audio Proc O/P Fail)

Exciter A/B: Audio
Shutdown

PAGE 4.1.20 VERSION 4.0 2018-02-26

Exciter (amber) This alarm occurs if the exciter is configured to include an Orban Inside

audio processor, but it is not communicating with the processor on the
internal serial bus. Check all connections to the Orban Inside audio
processor card.

Exciter (amber) This alarm occurs if the exciter is configured to include an Orban Inside

audio processor, but it is not detecting audio from the processor. Check all
connections to the Orban Inside audio processor card.

Exciter (red) This alarm occurs if the exciter’s audio processing and FM modulation code

is shut down. Should display only during a software upgrade.

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Exciter A/B: DSP
Audio Reset

Exciter A/B: Entered
Firmware Upgrade
(Firmware Upgr)

Exciter A/B: Exgine
Misconfigured

Exciter A/B: Exgine
Not Booted

Exciter A/B: Exgine
Offline

Controller Front
Panel LED (color)

Exciter (red) This alarm indicates that the exciter has detected a misalignment in the

Exciter (red) This alarm occurs when the exciter is in “firmware upgrade” mode. It

Exciter (red) This alarm occurs when the Exgine is not configured properly for the current

- This alarm occurs, in FM+HD or HD mode, when the exciter is initially

- This alarm occurs, in FM+HD or HD mode, when the exciter is not

Description and Troubleshooting Action

audio buffers and has restarted the audio processing in the DSP. If the
condition persists or re-occurs, this may indicate a fault with the exciter
hardware.

should only be displayed during a transmitter software upgrade.

operating mode. The alarm may occur briefly during a service mode change,
or may persist if the exciter cannot communicate with the Exgine. See the
troubleshooting action for the Exgine Offline alarm for more information.

powered up, but the Exgine PWB has not finished its boot-up sequence.
Normally, the alarm will clear on its own. If not, suspect a defective Exgine
PWB.

communicating with the Exgine PWB. Check the ribbon cable between the
Exgine PWB and J11 of the exciter PWB. Check the Exgine PWB.

Exciter A/B: External
Mute (Ext Mute)

Exciter A/B: External
Summary Alarm

Exciter A/B: Fan Fail Exciter (red) This alarm occurs if the exciter's cooling fan has been enabled, but the fan

Exciter A/B: Fan Volts
Fail

- This alarm occurs if the exciter has been muted (0 W) by the transmitter.
This is typical when the transmitter is in an ‘Rf off’ condition, or any other
condition that causes the RF drive to be inhibited (external interlock open,
etc.). If this alarm persists and there are no other causing conditions
present, check the transmitter link cable on the exciter.

- Not displayed in AUI or UI status. Configurable as a remote output. This
alarms occurs if there are any external related alarms present. Check for
specific external related alarms and troubleshoot accordingly.

tachometer measurement is below 2000 RPM. This alarm limits the exciter
RF output power to 10 W; however, if the fan speed recovers to an
acceptable level, the exciter RF output power will recover to the correct
operating level. Inspect the fan and, if necessary, replace it. In dual exciter
systems, a changeover to the standby exciter will occur if the faulty exciter
is inhibited due to the fault or its operating power level is limited enough to
affect the transmitter RF output power level.

- This alarm is for information only and should only occur when there is no
Exciter Fan Volts present.
necessary, replace.

Inspect the LVPS-A supply and circuitry and, if

VERSION 4.0 2018-02-26 PAGE 4.1.21

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Exciter A/B: FPGA
Test Failed (FPGA Fail)

Exciter A/B: High PA
Dissipation (High PA
Diss)

Exciter A/B: High PA
Temperature (High PA
Temp)

Exciter A/B: High SWR Exciter (amber) This alarm occurs if the exciter is experiencing high reflected power (greater

Exciter A/B: In Bias
Routine (Running
Bias Routine)

Exciter A/B: Licensing
Error

Controller Front
Panel LED (color)

Exciter (red) This alarm occurs if the FPGA on the main exciter card is not responding.

Power Amplifier
(amber)

Power Amplifier (red) This alarm will inhibit the exciter if the heatsink temperature sensed within

Power Amplifier (red) This alarm is for information only and should only occur when the bias

Exciter (red) This alarm should only occur if there is a fault with the memory on the

Description and Troubleshooting Action

This alarm prevents the exciter from producing modulation or RF power, and
may be the result of a failed software upgrade or a hardware failure on the
exciter/control PWB.

This alarm occurs when there is excessive power dissipation (approximately
300 W) in the exciter’s power amplifier.

the exciter’s power stage exceeds 85°C (185°F). This alarm will clear when
the heatsink temperature decreases to 75°C (167°F). This fault is likely

related to an associated fan failure or blockage

than 17.5 W). Check the connection and the RF load at the exciter’s output.

routine has been initiated.

exciter. It indicates that the exciter has not been licensed for the current
mode of operation.

.

Exciter A/B: Low
Battery

Exciter A/B: Missing
Preset

Exciter A/B:
Modulation Loss
(Mod Loss)

Exciter A/B: MPX
Audio Low (MPX Aud
Low)

Exciter (amber) This alarm occurs if the backup battery voltage falls below 2.7 V. The GV40/

GV30 takes no action on this alarm. Use a digital multimeter to check the
battery voltage (with ac power on). If the battery voltage is low, replace the
battery. If the battery voltage is OK, cycle ac power (off, then on). If the
alarm does not clear, suspect the exciter/control PWB.

Exciter (red) Visible only when replacing an exciter. This alarm occurs when there are no

presets programmed into the exciter. The transmitter should automatically
correct this.

Exciter (red) This alarm, enabled by the user, indicates that the exciter’s audio

modulation level is below the level specified in the audio loss settings of the
active preset (see
Maintenance Manual to enable/disable this alarm and to configure the

resulting action). Depending on the setting, this alarm could trigger a preset
change, inhibit the RF or have no effect (alarm only). Check the appropriate
program input(s) and the mod loss setting for the preset.

Exciter (amber) This alarm indicates the MPX input level is too low or is not applied. The

threshold and timing for this alarm can be adjusted in the Audio Low menu
in the user interface (see
of the Operations & Maintenance Manual.

“Mod Loss” on page 3.2.110 of the Operations &

“Setting User Thresholds” on page 3.2.181)

PAGE 4.1.22 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Exciter A/B: No Active
10MHz (No Act
10MHz)

Exciter A/B: No
Exgine 10 MHz

Exciter A/B: No
External 10MHz (No
Ext 10MHz)

Exciter A/B: No HD
Data Link (No HD
Data)

Exciter A/B: No
Reverse Path (No Rev
Path)

Exciter A/B: No
Transmitter
Communication (No
Xmtr Comms)

Controller Front
Panel LED (color)

Exciter (red) This alarms occurs if there is a fault with the current 10 MHz source being

- This alarms occurs, in FM+HD or HD mode, if no 10 MHz clock is being

Exciter (red) This alarms occurs if there is a fault with the external 10 MHz source being

- This alarms occurs, in FM+HD or HD mode, if IBOC data is not detected from

- This alarm indicates the RF sample from the transmitter output is below a

Exciter (red) This alarm occurs if the exciter is not detecting communication over the

Description and Troubleshooting Action

used to clock the exciter. Check the external 10 MHz source or suspect the
oscillator on the exciter.

detected from the Exgine PWB. Check the cable between the Exgine PWB
and J13 of the exciter PWB. Check that the Exgine PWB is powered up.

used to clock the exciter. Check the external 10 MHz source.

the Exgine PWB. Digital carriers are muted. Verify the RJ45 cable between
the Exgine PWB and J11 of the exciter PWB is seated properly. Check that
the Exgine PWB is correctly powered up.

preset threshold. The pre-correction function will not operate.

serial bus from the transmitter controller. This alarm is typically only visible
in the Events Log, since it will not be transmitted when communication is
interrupted.

Exciter A/B: No 1PPS Exciter (amber) This alarm occurs if the pilot output locking to 1 PPS is enabled and the

1 PPS signal is not present.

Exciter A/B: On Audio
Backup

Exciter A/B: PA1(or 2)
High Dissipation (PA
1(or 2) High Diss)

Exciter A/B: PA
Voltage Fail (PA Volts
Fail)

Exciter A/B: Pilot
Unsync

Exciter A/B: PLL
Unlock

Exciter (red) This alarm occurs if the main audio source has been lost, and the exciter has

switched to the backup source as configured by the user.

Power Amplifier
(amber)

Power Supply (red) This alarm occurs if the power supply voltage for the exciter PA is below

Exciter (amber) This alarm occurs if the pilot output locking to 1 PPS is enabled, but the

Exciter (red) This alarm occurs when the internal PLL of the exciter in unable to lock to

This alarm occurs when there is excessive power dissipation (approximately
300 W) in the exciter’s power amplifier.

20 V. Check for a blown fuse inside the exciter. Check LVPS module’s output
voltage.

exciter has not yet locked onto the incoming signal (if present). It may
indicate that the GPS receiver is not detecting a signal. Check the GPS
receiver and antenna.

the selected 10 MHz reference. Possible causes are an out-of-range 10 MHz
input or a hardware failure on the exciter/control PWB (A1).

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Exciter A/B: Power
Supply Summary
Alarm

Exciter A/B: Preamp
Voltage Fail (Preamp
V Fail)

Exciter A/B: Rebooted
Exciter (Rebooted
Exc)

Exciter A/B: Reboot
For Settings Needed
(Need Reboot)

Exciter A/B: Reduced
IBOC Injection

Controller Front
Panel LED (color)

- Not displayed in AUI or UI status. Configurable as a remote output. This

Power Supply (red) This alarm occurs if the power supply voltage for the pre-amplifier is below

Exciter (red) This is an informational alarm only that is displayed when the watchdog

Exciter (red) This alarm indicates that exciter setup changes have been made, typically

Exciter (red) This alarm occurs if the HD optimizer has decreased the transmitter’s HD

Description and Troubleshooting Action

alarm occurs if there are any alarms present that are related to the power
supplies. Check for associated alarms, and follow the associated
troubleshooting procedure, if present.

20 V. Check for a blown fuse inside the exciter. Check LVPS module’s output
voltage.

timer reboots the exciter’s main microcontroller (DSP) or after an ac power
interruption.

via the AUI. Typically, the DSP will reboot itself automatically. If the alarm
persists for more than five minutes, cycle the ac power (turn off, then on) to
store the changes.

injection level to ensure the output spectrum passes the mask. Typically
caused by a degrading output load impedance or PA or PS failures.

Exciter A/B: SCA 1 (or

2) Audio Low (SCA 1
or 2 Aud Low)

Exciter A/B: SRC1 (or
SRC2) Unlock

Exciter A/B: Summary
Alarm

Exciter A/B: SWR
Foldback

Exciter A/B: SWR
Shutback

Exciter (amber) This alarm indicates the SCA 1 or 2 input level is too low or is not applied.

The threshold and timing for this alarm can be adjusted in the Audio Low
menu in the user interface (see

“Setting User Thresholds” on

page 3.2.181) of the Operations & Maintenance Manual.

Exciter (amber) This alarm indicates that no valid AES/EBU stream data is being detected on

the selected AES/EBU input. Check audio input cables. The GV40/GV30
takes no action on this alarm.

- Not displayed in AUI or UI status. Configurable as a remote output. This
alarms occurs if there are any alarms present. Check for specific alarms and
troubleshoot accordingly.

Exciter (amber) This alarm occurs if the exciter reduces its output power due to a high SWR.

The exciter will attempt to maintain a maximum reflected power level of
25 W at all times. Check the connection and the RF load at the exciter’s
output.

Exciter (red) This alarm occurs if there is a sudden increase in the reflected power sensed

by the exciter due to an external condition (e.g., open or shorted RF drive
cable). The exciter’s RF output is reduced to 0 W. The threshold for this
alarm is typically set to 75 W. Check the connection and the RF load at the
exciter’s output.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Exciter A/B:
Temperature
Summary Alarm

Exciter A/B: Unsigned
DSP Image (Bad DSP
Image)

Exciter A/B: Unsigned
FPGA Image (Bad
FPGA Image)

Exciter A/B:
Unsupported Audio
Configuration

Exciter A/B: +15V
Fail, -15V Fail

Exciter A/B: +5V A or
B Fail, +3.3V Fail,
+1.8V Fail, +1.2V Fail

Controller Front
Panel LED (color)

- Not displayed in AUI or UI status. Configurable as a remote output. This

Exciter (red) This alarm indicates that the exciter is operating with ‘unsigned code’, but

Exciter (red) This alarm indicates that the exciter is operating with ‘unsigned code’, but

Exciter (red) This alarm indicates that the user has selected a preset configuration for the

Power Supply (red) This alarm occurs if the +15 V or -15 V power supply in the controller is 2 V

Power Supply (red) This alarm occurs if the associated power supply in the exciter is 10%

Description and Troubleshooting Action

alarms occurs if there are high temperature related alarms occurring. Check
for specific temperature related alarms and troubleshoot accordingly.

is otherwise operational. This alarm may only be displayed if the transmitter
is operating with a ‘beta’ version of factory software.

is otherwise operational. This alarm may only be displayed if the transmitter
is operating with a ‘beta’ version of factory software.

audio processing in the exciter that cannot be implemented. This may be
due to attempting to use the same physical input for multiple purposes, or
because two incompatible modes have been selected.

higher or 2 V lower than the desired value.

higher or 10% lower than the desired value.

Module #: Fan 1-6 Fail Power Amplifier

(amber)

Module #: Fan Fail
Shutdown

Module #: Fan Volts
Fail (Fan V Fail)

Module #: High Reject
Power (High Rej)

Module #: High RF
Drive Power (RF Drv
High)

Power Amplifier (red) This alarm occurs when more than one of the module’s six fans have failed.

Power Supply (red) This alarm occurs if the associated module’s cooling fan supply voltage is

Power Amplifier (red) This alarm occurs if the associated module’s reject load power exceeds

Power Amplifier (red) This alarm is indication only and occurs if the input RF drive (exciter power)

This alarm occurs if the module fans have been enabled, but the fan
tachometer measurement is below 2200 RPM. Inspect the affected fan and,

if necessary, replace it (see

“Module Cooling Fan Replacement” on

page 4.1.49).

The module will shut down. Failed fans must be repaired or replaced before
the module can operate. Check for associated Fan 1-6 Fail alarms and
troubleshoot accordingly.

10% high or 10% low. This may be the result of a circuit fault on the
module control/interface PWB.

400 W. This may be the result of PA failures. Check for associated alarms
and troubleshoot accordingly. This alarm may be accompanied by a Reject
Foldback alarm, which means the transmitter power will be reduced to
protect the reject load.

is greater than 45 W. Check the exciter power setpoint to make sure it is
correct for the transmitter.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Module #: High
Temperature (High
Temp)

Module #: Low RF
Drive Power (RF Drv
Low)

Module #: Missing Power Amplifier (red) This alarm occurs if the RF power module is removed. If the associated RF

Module #: No PAs
Operational (No PAs
Op)

Controller Front
Panel LED (color)

Power Amplifier (red) This alarm occurs if the associated module’s heatsink temperature exceeds

- This alarm occurs if the input RF drive (exciter power) is less than 10 W and

Power Amplifier (red) This alarm occurs when all of the power amplifiers in the associated module

Description and Troubleshooting Action

85°C (185°F). This alarm is most likely caused by excessive ambient
temperature, a module fan failure or blockage, or excessive power amplifier
dissipation. This alarm will clear when the module’s heatsink temperature
decreases to 75°C (167°F).

the transmitter has not intentionally reduced it to that level. This may be the
result of an exciter fault, excessive load variation on the active exciter
output, or defective components on the RF drive splitter/changeover
assembly.

power module is present, and the alarm still occurs, try reseating the RF
power module. If the alarm persists, suspect a fault with circuitry on the
module control/interface PWB (A3). See also Rack #: Module Extraction
Shutback alarm.

are inactive due to external conditions such as ac power loss, removal of
power supplies, or faults in the power supplies or power amplifiers. Check
for associated alarms and troubleshoot accordingly.

Module #: PA Current
Imbalance (PA Curr
Imb)

Module #: PA Volts A
(or B) Fail [PA V A (or
B) Fail]

Output Network
(amber)

Power Amplifier (red)

Power Supply (red) This alarm indicates the PA voltage from the power supply does not match

This alarm occurs when the maximum PA current on one side of the power
module combiner exceeds 3.5 times the maximum PA current on the other
side of the combiner. This will latch off the module, since it indicates a
possible fault in the module combiner, transmitter combiner or output
network. If more than one module has this alarm, the transmitter will shut
down with a Combiner Match alarm.

the requested setpoint. This is likely caused by a power supply failure. Check
the associated power supply module (A or B).

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Module #: PA 1-4 Fail Power Amplifier (red) This alarm occurs if (1) the PA voltage for the suspect PA is greater than

Module #: PS A (or B)
AC Fail

Controller Front
Panel LED (color)

Power Supply (red) This alarm occurs if one of the two module power supplies (1 or 2) is

Description and Troubleshooting Action

16 V; (2) the RF drive level to the suspect RF power module (with failed PA)
is greater than 10 W; and (3) if conditions (1) and (2) are met, the dc input
current for the suspect PA has fallen below a preset threshold (typically less
than 50% of the average PA current of the operational PAs). This may be
caused by a cabling fault on the PA, loss of PA voltage, bias voltage or RF
drive, or a defective FET. The transmitter’s output power may be reduced,
depending on the power setpoint.

The alarm can also occur after initiating a Xmtr PA Bias routine, which is
required after replacing an RF power module or the controller module. In
this case the alarm indicates that the bias routine failed for the specified PA,
possibly as a result of a PA bias circuit failure or an actual PA failure.
Attempt to operate the PA in the desired mode. If the fault clears, the alarm
was likely caused by a PA bias circuit fault. If the fault remains and/or the
PA current levels are below average, it is likely a PA failure.

reporting an ac failure, indicating its ac input voltage is less than 175 V ac.
If a bank of power supply modules are indicating an AC Fail alarm, it is
possible that an ac phase loss has occurred. Check the ac voltage applied to
the suspect power supply module. If the ac voltage is acceptable, replace

the module (see

“LVPS / Power Supply Module Replacement” on

page 4.1.50).

Module #: PS A (or B)
Current Limit

Module #: PS A (or B)
Fail

Power Supply (red) This alarm occurs if one of the two module power supplies (1 or 2) is

reporting a current limit, indicating that the power being delivered by the
module has reached 2750 W. This may relate to the operating mode and/or
the load impedance at the transmitter’s RF output. Check for other
transmitter related alarms.

Power Supply (red) This alarm occurs if one of the two module power supplies (1 or 2) is

reporting a PS failure, indicating its output voltage is outside its acceptable
range, based on the control setting. Check the dc voltage output of the
suspect power supply module. If the dc voltage is out of tolerance, replace

the power supply module (see

“LVPS / Power Supply Module

Replacement” on page 4.1.50). If the voltage is acceptable, suspect

the PS interface PWB (A1).

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Module #: PS A (or B)
High Temperature [PS
A (or B) Temp]

Module #: PS A (or B)
Low Line

Module #: PS A (or B)
Missing

Controller Front
Panel LED (color)

Power Supply (red) This alarm occurs if one of the two module power supplies (1 or 2) is

Description and Troubleshooting Action

reporting a high temperature alarm, indicating its operating temperature
has exceeded its internal threshold of 105°C (221°F). Both module power
supplies are inhibited while this fault exists. This alarm is most likely caused
by a module fan failure or blockage. Verify the module turns on and its fan
is operational. If the fan is not operational, inspect it for possible blockage.

If necessary, replace the power supply module (see

“LVPS / Power Supply

Module Replacement” on page 4.1.50). If the alarm persist after

replacing the module, suspect the PS interface PWB (A1).

Power Supply (red) This alarm occurs if one of the two module power supplies (1 or 2) is

reporting a low ac input voltage (less than 175 V ac, higher than 90 V ac).
The power supply will limit its associated module’s output.

Power Supply (red) This alarm occurs if the module power supply (A or B) is removed, or has not

been detected on the serial bus. Install an operational power supply
module. The alarm may persist for several seconds after replacing a power
supply module, before the power supply module is recognized. If the alarm
persists after one minute, try reseating the power supply module. This alarm
may also be caused by an ac power loss to the power supply module.

Module #: Reject
Power Shutback (Rej
Shutback)

Module #: RF Drive
Loss (RF Drv Loss)

Module #: Switch
Inhibit (Switch Inh)

Rack #: AC Phase
Loss A/B/C

Output Network
(amber)

Power Amplifier (red) This alarm occurs if the input RF drive (exciter power) is less than 1 W when

Power Amplifier (red) This alarm occurs if the module’s front panel switch is in the ‘DISABLE

Power Supply (red) This alarm occurs if several power supply modules report a PS AC Fail alarm,

This alarm occurs when the reject power in the power module’s combiner
suddenly exceeds 600 W, requiring a shutback. This may be the result of a
PA failure or, under certain conditions, may indicate a fault in the
transmitter’s RF combiner/filter. The module will be latched off until a reset
is initiated.

it is expected to be 2 W or higher, based on the measurements from the
remaining power modules. Check the RF drive cable between the splitter
and the module control/interface PWB (A3).

(down)’ position. Set the switch to its ‘ENABLE (up)’ position to enable the
module.

indicating that one of the phases of the main ac power source may have
been lost. Check the three amber LEDs in the bottom, rear of the
transmitter. If the LEDs are off, there is likely a problem with the ac service.
Measure the ac source voltage at the service entrance. Normally this should
measure between 175 and 265 V ac line-line [for 3-phase (nominal 208 V
ac) and 1-phase (nominal 240 V ac)] or between 303 and 459 V ac line-line
[for 3-phase (nominal 400 V ac)]. While this alarm is active, the
transmitter’s ALC function will not allow an increase in output power.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Rack #:
Communication Fail
(Comm Fail)

Rack #: Discharging
PA Volts (Discharging
PA V)

Rack #: EEPROM Fail - This alarm occurs if the rack is unable to load its configuration from

Controller Front
Panel LED (color)

- This alarm occurs if communication with the controller has been

PS (red) This alarm occurs when the transmitter has initiated a shutback sequence,

Description and Troubleshooting Action

interrupted. This alarm is typically only visible in the Events Log, since it will
not be transmitted when communication is interrupted. Check cable
connections between the associated module interface PWB and the
controller.

and residual PA voltage energy stored in the capacitors in the power
supplies and PAs is being discharged. During a shutback sequence, the RF
drive to the PAs is turned off immediately after the event, and this occurs
faster than the power supply modules can be inhibited. Therefore, PA
voltage is still being applied to the capacitors with no drive to discharge the
energy. To discharge the stored energy from the capacitors, the PA bias is
increased to a discharge level after the power supplies have been inhibited.
This causes the stored energy to be dissipated through dc current in the FET.
This alarm should only occur with a Residual PA Volts Present alarm. See
Residual PA Volts Present alarm for more information.

EEPROM. This is a non-critical fault, since all of the information is
retrievable from the power supply modules and the controller.

Rack #: High Ambient
Temperature (High
Amb Temp)

Rack #: LVPS 1/2 A (or
B) Fail

Rack #: LVPS 1/2 A (or
B) AC Fail

- This alarm is indication only and occurs if the transmitter’s ambient
temperature exceeds 60°C (140°F). Check the intake air filters or cooling
system.

Power Supply (red) This alarm occurs if LVPS module 1A (U2), 1B (U3), 2A (U12), or 2B (U13) is

reporting a PS failure, indicating its output voltage is outside its acceptable
range, based on the control setting. Check the dc output voltage of the
suspect LVPS. If the dc voltage is out of tolerance, replace the LVPS module

(see

“LVPS / Power Supply Module Replacement” on page 4.1.50).

If the dc voltage is acceptable, suspect the PS interface PWB (A1).

Power Supply (red) This alarm occurs if LVPS module 1A (U2), 1B (U3), 2A (U12), or 2B (U13) is

reporting an ac failure, indicating its ac input voltage is less than 175 V ac.
Check the ac voltage applied to the suspect LVPS module. If the ac voltage

is acceptable, replace the LVPS module (see

“LVPS / Power Supply

Module Replacement” on page 4.1.50).

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Rack #: LVPS 1/2 A (or
B) High Temperature
[LVPS A (or B) Temp]

Rack #: LVPS 1/2 A (or
B) Low Line

Rack #: LVPS 1/2 A (or
B) Missing

Controller Front
Panel LED (color)

Power Supply (red) This alarm occurs if LVPS module 1A (U2), 1B (U3), 2A (U12), or 2B (U13) is

Description and Troubleshooting Action

reporting a high temperature alarm, indicating its operating temperature
has exceeded its internal threshold of 105°C (221°F). This alarm is most
likely caused by a module fan failure or blockage. Allow the module to cool
and attempt to reset the alarm. Verify the module turns on and its fan is
operational. If the fan is not operational, inspect it for possible blockage. If

necessary, replace the LVPS module (see

“LVPS / Power Supply Module

Replacement” on page 4.1.50).

Power Supply (red) This alarm occurs if LVPS 1A (U2), 1B (U3), 2A (U12), or 2B (U13) is

reporting a low ac input voltage (less than 175 V ac, higher than 90 V ac).
The power supply will limit its associated module’s output.

Power Supply (amber) This alarm occurs if LVPS module 1A (U2), 1B (U3), 2A (U12), or 2B (U13)

has been removed. Install an operational LVPS module. The alarm may
persist for several seconds after replacing an LVPS module, before the LVPS
module is recognized. If the alarm persists after one minute, try reseating
the LVPS module. This alarm may also be caused by an ac power loss to the
LVPS module. This alarm only occurs if the system is configured to use LVPS

1A, 1B, or 2A, 2B, as applicable (see

“LVPS Hardware” on

page 3.2.138) of the Operations & Maintenance Manual.

Rack #: Module
Extraction Shutback

Rack #: Reject Fan
Volts Fail (Rej Fan V
Fail)

Rack #: Residual PA
Volts (Residual PA V)

Rack #: +15V Fail Power Supply (red) This alarm occurs if the +15 V supply on the module control/interface PWB

Rack #: +3.3V Fail Power Supply (red) This alarm occurs if the +3.3 V supply on the module control/interface PWB

Power Amplifier (red) This alarm occurs if the RF power module is removed without first being

inhibited via its front panel switch. Try reseating the RF power module. If
the alarm persists, suspect a fault with circuitry on the associated module
control/interface PWB.

Power Supply (red) This alarm occurs if the fan voltage for the module is 10% high or 10% low

from the expected value. This may be the result of a fault with the
associated circuit on the module control/interface PWB (A3).

Exciter (red) This alarm indicates that after the transmitter has turned off its RF output, it

is unable to discharge the PA volts to a level that is below 10 V. This
condition will not allow the transmitter to turn on its RF output; however
the condition will be cleared once the PA volts reaches a level that is below
10 V. If the condition cannot be cleared automatically, the transmitter will
still be allowed to turn on. This condition will typically occur with a failed
PA or power supply module. Check for associated alarms and follow the
associated troubleshooting procedure.

(A3) is outside its acceptable voltage range (between +13.5 and +16.5 V).

(A3) is outside its acceptable voltage range (between +3.0 and +3.6 V).

PAGE 4.1.30 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Device and
Alarm Name
(AUI, UI)

Rack #: +5V Fail Power Supply (red) This alarm occurs if the +5 V supply on the module control/interface PWB

Controller Front
Panel LED (color)

Description and Troubleshooting Action

(A3) is outside its acceptable voltage range (between +4.5 and +5.5 V).

VERSION 4.0 2018-02-26 PAGE 4.1.31

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

1/4-TURN LATCHES

16 in each rear panel

LOWER, REAR PANELS

11 M5 screws each

LOCK OUT AC POWER
BEFORE REMOVING!

Accessing the Inside of the Transmitter

The front of the GV40/GV30 has hinged doors that provide access to the remote interface PWB (A16),
RF power modules 1 through 16 (A8 through A11, A20 through A23, A36 through A39 and A44
through A47), LVPS modules 1A (U2), 1B (U3), 2A (U12, if purchased) and 2B (U13, if purchased),
power supply modules (U4 through U11, U14 through U37), controller module (A4) and exciters A (A5)
and B (A6, if purchased).

The rear of the GV40/GV30 has removeable access panels (see Figure 4.1.5). Removing the upper panel
provides access to the ac input terminal block (TB1), the rear panel of the controller (A4), exciters A
(A5) and B (A6, if purchased), reject load (A13), and various other PWBs and assemblies. Removing the
lower panel provides access to the power supply interface PWBs (A1, A17, A33 and A41).

Figure 4.1.5: Rear Access Panels

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Troubleshooting Tips

 AUI Screen Lockup

 RF Power Module Faults

 Power Supply Module and LVPS Faults - see page 4.1.38

AUI Screen Lockup

If the local AUI screen locks up, perform the following steps to restore normal AUI operation:

1. If you also use a PC for remote AUI control/monitoring of the transmitter, use the PC to navigate to
the System Settings page (from the Menu options). Select Reset and click the Reboot AUI
button. If the local AUI is non-responsive (locked up) or this does not restore operation of the AUI,
proceed to Step 2.

2. Open the front door and use the controller’s UI to navigate to the System Settings -> SBC Reset
screen. Select Force SBC Reset and press accept to save the changes (see the GV40/GV30
Operations & Maintenance Manual). If this does not restore operation of the AUI, proceed to

Step 3

3. Remove the rear panel to gain access to the rear of the controller module (A4). From the rear
panel, use a suitable tool to activate the SBC RESET button (next to the CONSOLE A2J8 D-sub
connector, see Figure 4.1.6) via the rear panel clearance hole.

Figure 4.1.6: SBC Reset Button (partial rear view of controller A4)

VERSION 4.0 2018-02-26 PAGE 4.1.33

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

1. Click here to open the
Meter List View page

2. Click here to open the

RF Module status screen

3. Click here to expand

folder to allow viewing of

each RF Module’s

status screen

RF Power Module Faults

There are many alarms on the AUI (local or remote) or controller UI, prefixed by the text RF Module,
that indicate faults related to one or more of the RF power modules. The number that appears after

RF Module (1-16) identifies the position of the affected module. Numbers correspond to modules in a

left to right, top to bottom sequence, as viewed from the front of the transmitter.

1. Check the forward power reading on the UI or AUI. If it is less than the preset level, one or more RF
power modules are defective. Proceed to “RF Power Module Fault Validation” on page 4.1.36.

2. If the forward power reading in Step 1 is normal, go to the controller UI’s Alarms screen or select
the AUI’s (local or remote) Status button on the remote AUI to check for other alarms that may
have triggered the RF power module alarm.

3. From the remote AUI’s Meter List View page (see Figure 4.1.7), click the i (information) button

next to the RF Modules # folder in the Transmitter Layout section to view the status screen for all

modules or click the right-hand arrow to expand the RF Modules folder to allow clicking on the i

button for an individual RF Module (e.g., RF Module 1, see Figure 4.1.8 on page 4.1.35). This screen
displays critical parameters for all 16 RF power modules. As an aid in troubleshooting, compare
parameters to isolate possible module faults.

Figure 4.1.7: AUI - Meter List View page

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Figure 4.1.8: RF Module Status Screen

VERSION 4.0 2018-02-26 PAGE 4.1.35

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

RF Power Module Fault Validation

Each RF power module has a multi-colour LED on its front panel, which can help in identifying a fault
and allowing you to determine whether remedial action is required now or later.

Identify and isolate a defective RF power module, and verify the nature of the defect by checking the
LED on the RF power module’s front panel. Note which RF power module is not operating normally and
producing RF power (i.e., LED is not solid green). Record which RF power modules are displaying an
alarm and the state of its LED (see below).

 Green (solid): Module is operational

 Green/Amber (blinking): Module is operational, but has a non-critical fault.

 Green/Red (blinking): Module is operational, but has a critical fault.

 Amber (solid): Module is in a controlled inhibit state, but ready for operation (i.e., RF off).

 Amber/Red (blinking): Module is inhibited by a latching fault.

 Red (solid): Module is inhibited by a fault.

Attempt to reset an RF power module, by initiating a Reset on the AUI or controller UI. If you cannot
reset the front panel LED alarm, see “RF Power Module Troubleshooting” on page 4.1.36.

RF Power Module Troubleshooting

Refer to “Operating with Defective or Missing RF Power Modules” on page 4.1.36 for removal and
installation instructions and then refer to “Troubleshooting RF Power Modules” on page 4.1.46 for
detailed troubleshooting information.

NOTE: A defective RF power module can be removed for repair, without turning off the transmitter, as

described in “Removing an RF Power Module” on page 4.1.44. The transmitter can be operated at a
reduced output power level with an RF power module removed.

Operating with Defective or Missing RF Power Modules

It is permissible to operate the transmitter with multiple defective or missing RF power module(s).

Table 4.1.2 on page 4.1.37 shows the approximate percentage of remaining output power (relative to

original) when RF power modules, power amplifiers (PAs), or power supply modules fail or are removed.

CAUTION! Do not attempt to compensate for power reduction caused by an RF

power module failure by adjusting the RF power level.

PAGE 4.1.36 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

 If an RF power module has one or more defective PAs, as indicated by the AUI's Module Status

screen (and suspect RF power module's front panel LEDs), but is still contributing to the
transmitter's RF output, it may be left on. The transmitter will take necessary precautions to
reduce the stress on components due to the failure, i.e., power reduction.

 If an RF power module must be removed, turn it off prior to disengaging its blind-mating

connectors. Refer to “RF Power Module Replacement” on page 4.1.44 to disable a module with
the transmitter on air. At all other times, turn off the switching power supplies by pressing the

RF Off button, then switch off the ac power source at the service entrance.

NOTE: There are many possible combinations of PA/module failures or extractions. The best and worst

case situations are shown in Table 4.1.2 on page 4.1.37.

 When maintenance is complete and it is safe to return the transmitter to normal service,

enable all RF power module supplies by setting the switch on the front of the associated RF
power module(s) to its ‘ENABLE (up)’ position.

Table 4.1.2: Output Power Level vs. PA/Module Failure/Removal

RF Output Power

PA/Module Failures/Removal

(% of original RF output power)

Best Case Worst Case

1 RF Power Module 88 88

2 RF Power Modules 77 38

1 RF Power Amplifier 97 97

2 RF Power Amplifiers 94 63

3 RF Power Amplifiers 91 61

4 RF Power Amplifiers 88 59

5 RF Power Amplifiers 85 57

6 RF Power Amplifiers 82 55

1 Power Supply Module 94 94

2 Power Supply Modules 88 88

VERSION 4.0 2018-02-26 PAGE 4.1.37

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Power Supply Module and LVPS Faults

There are various power supply module and LVPS module related alarms on the AUI (local or remote) or
controller UI.

Power supply module alarms are prefixed by the text RF Module and then PS. The number that
appears after RF Module (1-16) identifies the position of the affected module. The letter that appears
after PS (A or B) identifies the affected power supply module. There are two power supply modules for
each RF power module.

Low voltage power supply (LVPS) alarms are prefixed by the text LVPS. The number and letter that
appears after LVPS (1A or 1B, 2A or 2B, if installed) identifies the affected LVPS module.

1. Check the front panel LEDs of the power supply modules and LVPS modules. Normally, only the AC
OK and DC OK LEDs should be on (solid green). If not, the associated power supply module or LVPS
module may be defective. Proceed to “Power Supply or LVPS Module Fault Validation” on

page 4.1.41.

2. From the AUI’s (local or remote) Meter List View page (see Figure 4.1.9 on page 4.1.39):

 select the i (information) button next to the RF Modules # folder in the Transmitter Layout

section to view the status screen for all modules or select the right-hand arrow to expand the

RF Modules folder to allow clicking on the i button for an individual RF Module (e.g., RF

Module 1, see Figure 4.1.10 on page 4.1.39). This screen displays critical parameters for the
power supply modules. As an aid in troubleshooting, compare parameters to isolate possible
faults.

 select the i (information) button next to the Rack # folder in the Transmitter Layout section

and then to view the Rack status screen (see Figure 4.1.11 on page 4.1.40). This screen
displays LVPS meters.

PAGE 4.1.38 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

1. Click here to open the
Meter List View page

3. Click here to view
power supply module
meters

2. Click here to view
LVPS meters

Figure 4.1.9: AUI - Meter List View page

Figure 4.1.10: Module Status - Power Supply Meters

VERSION 4.0 2018-02-26 PAGE 4.1.39

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Figure 4.1.11: Rack Status - LVPS meters

PAGE 4.1.40 VERSION 4.0 2018-02-26

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Top of Power Supply Module

Power Supply or LVPS Module Fault Validation

Each power supply and LVPS module has four LEDs on its front panel (see Figure 4.1.12, which can help
in identifying a fault and allowing you to determine whether remedial action is required now or later.

Figure 4.1.12: Power Supply Module LEDs

Record which power supply modules are displaying an alarm and the state of its LEDs (see below).

 AC OK LED

 Green (solid): Ac voltage is present and within acceptable limits.

 Green (blinking): Ac voltage is present, but outside acceptable limits.

 DC OK LED

 Green (solid): Power supply is enabled and output regulated.

 Green (blinking): Power supply is experiencing an over-current condition.

 SERVICE LED

 Amber (solid): Power supply is experiencing a high temperature condition.

 FAULT LED

 Red (solid): Module is experiencing and internal fault.

 Red (blinking): Communication has been lost with the rack controller.

Other combinations of power supply module LEDs, and the corresponding power supply condition, are
listed in Table 4.1.3 on page 4.1.42.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Table 4.1.3: Other Power Supply LED States

Power Supply LED State

Condition

OK On On Off Off

Thermal alarm (5 degrees before shutdown) On On On Off

Thermal shutdown On Off On On

AC OK

(green)

DC OK

(green)

SERVICE

(amber)

FAULT

(red)

Defective fan, blown ac fuse, boost stage failure or over
voltage latched shutdown

Ac present, but not within limits Blinks Off Off Off

Ac not present Off Off Off Off

Non-catastrophic internal failure On On Off On

Standby On Off Off Off

Service Request (PMBus mode) On On Blinks Off

Communications Fault On On Off Blinks

On Off Off On

Operating with Defective or Missing Power Supply or LVPS Modules

You can operate the transmitter - at normal desired power level - with one defective or missing LVPS
module, assuming the transmitter was using dual LVPS modules. To replace an LVPS module, go to

“LVPS / Power Supply Module Replacement” on page 4.1.50.

You can operate the transmitter - at a reduced output power level - with multiple defective or missing
power supply module(s) (see Table 4.1.2 on page 4.1.37). To replace a power supply module, go to

“LVPS / Power Supply Module Replacement” on page 4.1.50.

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Replacement Procedures

Table 4.1.4 lists the procedures available in this manual for replacing modules, PWBs and cooling fans.

Table 4.1.4: Replacement Procedures

Module Replacement Procedure

RF Power Module

Power Amplifier PWB

RF Module Cooling Fan

LVPS / Power Supply Modules

Remote Interface PWB

Cooling Fan Replacement

Reject Load Assemblies or Reject Load/Splitter
Interface Assembly

Controller Module

Single-Board Computer (SBC)

Controller PWB

Exciter Module

Exciter/Control PWB - Exciter

Pre-Amplifier PWB - Exciter

See

page 4.1.44

See

page 4.1.47

See

page 4.1.49

See page 4.1.50

See

page 4.1.53

See

page 4.1.55

See

page 4.1.57

See

page 4.1.60

See

page 4.1.62

See

page 4.1.65

See page 4.1.67

See

page 4.1.69

See

page 4.1.72

Module Control/Interface PWB

Power Supply Interface PWB

UPS Interface Power Supply

Power Module Combiner PWB (NAPH06)

Power Module Combiner PWB (PR82C)

VERSION 4.0 2018-02-26 PAGE 4.1.43

See

page 4.1.75

See

page 4.1.78

See

page 4.1.79

See

page 4.1.81

See

page 4.1.84

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

RF Power Module Replacement

Removing an RF Power Module

1. Confirm the location of the RF power module that is being removed. Note the alarm text includes a

Module number (1-16) that is not identified on the RF power module. See Figure 4.1.13 on page

4.1.45 to determine the location for a given RF power module (1-16).

2. Open the transmitter’s front doors.

3. Set the ENABLE/DISABLE switch on the front of the suspect RF power module to its DISABLE
(down) position. This inhibits the module’s associated pair of power supply modules.

4. Remove and retain the two M5 securing screws in the front of the module. If necessary, remove the
M8 shipping screw in the back of the module (the shipping screws do not need to be reinstalled,
and may have already been removed during installation or previous maintenance).

WARNING! Fans with rotating blades are present at the bottom of the RF
power module. Take care when removing the module.

5. Grasp the handle on the front of the RF power module and carefully pull the RF power module out
of the transmitter, noting that there are catches on the transmitter tray that will prevent the rear of
the RF power module from being fully extracted. When the module reaches these catches, lift the
rear of the module over the catches by tilting the module’s front down and then lift by the rear
handle. The module weighs 14.5 kg (32 lbs).

Installing an RF Power Module

1. Grasp the front and rear handles on the RF power module and insert it into the transmitter,
ensuring that the rear of the module clears the catches in the transmitter tray.

2. Carefully push the RF power module into place so that its edge-card connector mates with the
transmitter.

3. Install both M5 securing screws in the RF power module’s front panel.

4. Set the ENABLE/DISABLE switch on the front of the RF power module to its ENABLE position (see

Figure 4.1.13 on page 4.1.45). This activates the module and its two associated power supplies.

5. With RF off and the system interlock circuit intact (closed), use the controller’s front panel UI to
initiate a Xmtr PA Bias routine (see Main Menu -> System Settings -> Factory Settings ->

Calibration

; refer to the Operations and Maintenance Manual for more detail).

6. Close the front door.

PAGE 4.1.44 VERSION 4.0 2018-02-26

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Enable/Disable Switch

Partial Front View - Front Doors Open

M5 securing screws

(2 per module)

1

324

5

7

6

8

9

10 11

12 13 14 15 16

Figure 4.1.13: RF Power Module Numbers/Locations

VERSION 4.0 2018-02-26 PAGE 4.1.45

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Troubleshooting RF Power Modules

Maintenance Philosophy

Maintenance on an RF power module consists of replacing PA PWBs or cooling fans.

Special Tools and Test Equipment

The following tools and test equipment are required to troubleshoot an RF power module.

 Digital multimeter

 Torque screwdriver, capable of torquing up to 0.67 N-m (6 in.-lbs). Required for installing

attaching hardware for PA PWB FETs.

 Soldering iron and desoldering tool

 GV40/GV30 station spares kit, if purchased (contains replacement PA PWBs and cooling fans)

 GV40/GV30 site spares kit, if purchased (contains replacement cooling fans)

 Electrical schematics in Section 4 of this manual.

 Mechanical drawing in Section 5 of this manual.

Electrostatic Precautions

The RF power module contains semiconductor devices that are susceptible to damage from electrostatic
discharge. Be sure to follow the electrostatic precautions in “Electrostatic Protection” on page 4.1.3 at
all times.

Preparation for Troubleshooting

1. Follow the procedure in “Removing an RF Power Module” on page 4.1.44 to remove the RF power
module from the transmitter.

2. Place the RF power module on a suitable work surface.

3. Based on the AUI (local or remote) or controller UI alarm that prompted RF power module
troubleshooting, replace either the defective PA PWB (see “PA PWB Replacement” on page 4.1.47)
or defective cooling fan (see “Module Cooling Fan Replacement” on page 4.1.49).

NOTE: If a failure occurs, you must replace the entire power amplifier PWB, rather than an individual

FET. A spare power amplifier PWB (NAPA31C) is provided in the transmitter station spares kit, if
purchased. To order a station spares kit or replacement power amplifier PWB contact Nautel. Failure to
observe this recommendation may void your equipment warranty or cause further failures.

PAGE 4.1.46 VERSION 4.0 2018-02-26

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PA PWB Replacement

See Figures MD- and MD- in the Mechanical Drawings section (Section 5) of this manual.

1. Remove the RF power module’s right-hand side cover (see Figure 4.1.14 on page 4.1.49) by
removing 11 M3 countersunk screws. Retain hardware for re-installation.

2. Before replacing a suspect PA PWB, verify the fault is with the suspect PA PWB by performing the
continuity and resistance checks detailed in “PA Resistance Checks” on page 4.1.48. If you are
prompted to replace a PA PWB, return to Step 3 of this procedure.

3. Unsolder and remove the four solder connections to the defective PA PWB. They include two
24 AWG links (to pads V and X), a white 12 AWG wire (to pad U) and a 16 AWG link (to pad D).

4. Remove the two #4 screws, split and flat washers securing the FET to the heat sink.

5. Remove the seven M3 screws securing the PA PWB to the heat sink.

6. Obtain the replacement NAPA31C PA PWB from the station spares kit, if purchased.

NOTE: FETs are static sensitive and must be handled in a static protected manner.

7. Spread a small amount of thermal compound (Nautel Part # HAG39, from the station spares kit),
thinly and evenly, on the bottom of the FET flange on the new PA PWB.

8. Secure the PA PWB on the module's heat sink using the seven screws removed in Step 5. Ensure
correct orientation (same as the adjacent PWB). Do not tighten the four screws at this time.

CAUTION! When installing FET securing hardware, you can damage the FET case if

you fully tighten one screw while the other is loose. Avoid this by alternately
tightening the two screws.

9. Secure the FET (Q1) with two # 4 screws, a mini-flat washer and a new split washer. Using a torque
screwdriver, alternate tightening the left and right screws on each FET, a quarter turn at a time,
until 6 inch-pounds (0.67 Newton-meters) of torque has been applied.

10. Tighten the seven PWB screws.

11. Solder the wires removed in Step 3.

12. Re-install the RF power module right-hand cover and return the module to the transmitter (see

“Installing an RF Power Module” on page 4.1.44).

VERSION 4.0 2018-02-26 PAGE 4.1.47

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

PA Resistance Checks

1. Using a digital multimeter, check the continuity across fuse F1 on the suspect PA PWB.

 If the measurement is an open circuit, replace the PA PWB (see “PA PWB Replacement” on

page 4.1.47).

 If the measurement is short circuit (near 0 ), proceed to Step 2.

2. Using a digital multimeter, measure the resistance between each gate lead of the FET and the
metal flange of the FET.

 If the measurement is less than 8 k, replace the PA PWB (see “PA PWB Replacement” on

page 4.1.47).

 If the measurement is between 8 kand 17.5 k, check the other PA PWBs for a failure. If

none of the other PA PWBs have failed, replace the original suspect PA PWB.

 If the measurement is greater than 17.5 k, proceed to Step 3.

3. Using a digital multimeter, check the continuity between each drain lead of the FET (positive meter
probe) and the metal flange of the FET (negative meter probe).

 If the measurement is open circuit, the PA PWB is OK and does not require replacement.

Continue troubleshooting and suspect a problem with an associated PWB.

 If the measurement is not open circuit, replace the PA PWB (see “PA PWB Replacement” on

page 4.1.47).

PAGE 4.1.48 VERSION 4.0 2018-02-26

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COOLING FANS
B1 - B6

(B1 removed)

B1

B2

B3

B4

B5

B6

RIGHT-HAND
SIDE COVER

Module Cooling Fan Replacement

See Figure 4.1.14.

1. Remove the RF power module’s right-hand side cover by removing the 11 M3 countersunk screws.
Retain hardware for re-installation.

2. Disconnect the suspect cooling fan’s mating plug (B1P1 through B6P1). Cut the tyrap that secures
the fan wiring to the splitter PWB.

3. Remove and retain the cooling fan’s two M3 captive screws that secure the fan to the module.

4. Obtain a replacement fan (Nautel Part # ZAP50) from the site spares kit or station spares kit or
from a suitable equivalent (vendor part # is Minebea Motor Mfg. Corp. 3115RL-07W-B79-E51).

5. Install the replacement fan using retained screws. Torque hardware to 1.0 inch-pounds only to
avoid cracking the fan’s body. Twist the fan’s mating plug three times (reduces RFI) and reconnect
it to the splitter PWB. Secure the wiring using a tyrap (Nautel Part # HT66) from the ancillary kit.

6. Re-install the right-hand side cover using retained hardware.

7. Return the RF power module to the transmitter (see “Installing an RF Power Module” on

page 4.1.44).

Figure 4.1.14: Replacing a Power Module Cooling Fan

VERSION 4.0 2018-02-26 PAGE 4.1.49

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Front doors open for clarity

LVPS 1A (U2)
LVPS 1B (U3)

LVPS 2A (U12*, optional)
LVPS 2B (U13*, optional)

Power Supply Associated RF
Module Power Module

1A (U4), 1B (U5) 1 (A8)
2A (U6), 2B (U7) 2 (A9)
3A (U8), 3B (U9) 3 (A10)
4A (U10), 4B (U11) 4 (A11)
5A (U14), 5B (U15) 5 (A20)
6A (U16), 6B (U17) 6 (A21
7A (U18), 7B (U19) 7 (A22)
8A (U20), 8B (U21) 8 (A23)

Power Supply Associated RF
Module Power Module

9A (U22), 9B (U23) 9 (A36)
10A (U24), 10B (U25) 10 (A37)
11A (U26), 11B (U27) 11 (A38)
12A (U28), 12B (U29) 12 (A39)
13A (U30), 13B (U31) 13 (A44)
14A (U32), 14B (U33) 14 (A45)
15A (U34), 15B (U35) 15 (A46)
16A (U36), 16B (U37) 16 (A47)

LVPS / Power Supply Module Replacement

WARNING! Lethal voltages exist inside the transmitter when the power is
turned on. Follow replacement instructions carefully to ensure safety for
maintenance personnel during power supply replacement.

Figure 4.1.15: Location of LVPS / Power Supply Modules

PAGE 4.1.50 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

AC OK and DC OK LEDs should be on (green)
after successful power supply installation.

If the associated RF power module is disabled,
the DC OK LED will not turn on until the module
is enabled.

1. Use the transmitter’s AUI (local or remote) or controller UI alarm status/logs to isolate the defective
low voltage power supply (LVPS), noting there may be redundant (dual) supplies installed, or
Power Supply module.

2. Open the transmitter front door and locate the suspect LVPS / Power Supply module. See

Figure 4.1.15 on page 4.1.50.

3. Using Figure 4.1.16 on page 4.1.51 as a guide, remove the LVPS / Power Supply module from the
front of the transmitter.

4. Locate or obtain a replacement LVPS / Power Supply module (Nautel Part # UG92*).

5. Using Figure 4.1.16 on page 4.1.51 as a guide, reinstall the new LVPS / Power Supply module.

Figure 4.1.16: Removing/Installing LVPS / Power Supply Modules

VERSION 4.0 2018-02-26 PAGE 4.1.51

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

6. Verify that the AC OK and DC OK LEDs, on the front of the LVPS / Power Supply module, are solid
green.

NOTE: The FAULT LED (red) may blink temporarily until communication is established between the

power supply and the transmitter.

7. The transmitter should resume normal operation and the alarm should clear.

8. Close the transmitter’s front door.

PAGE 4.1.52 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Front doors open for clarity

Remote

Interface PWB

D-sub connectors

W20P2 and W21P2

Customer remote

control/monitor wiring

Customer interlock

wiring (TB1)

Customer LAN

port (J1)

Cat5E connector

W29P2 (J2)

Remote Interface PWB Replacement

Using Figure 4.1.17 as a guide, replace the remote interface PWB as follows:

Figure 4.1.17: Remote Interface PWB Location

1. Turn off and lock out the transmitter’s main ac power.

2. Open the front door to gain access to the remote interface PWB.

3. Remove all customer interface wiring from the remote interface PWB. Note the destination of each
wire for ease of reconnecting.

4. Disconnect the two D-sub connectors (W20P2 and W21P2) from the bottom of the PWB and the
Cat5E connector (W29P2) from the right-hand side of the PWB (mates with J2).

VERSION 4.0 2018-02-26 PAGE 4.1.53

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

5. Remove and retain the six sets of mounting hardware from the remote interface PWB. Remove the
remote interface PWB from the transmitter.

6. Locate or obtain a replacement remote interface PWB (Nautel Part # NAPI143/02).

7. Set jumpers E1 and E2 on the new remote interface PWB to the same positions as the defective
PWB.

8. As applicable, use an indelible marker to identify the LED and switch labels on the new remote
interface PWB to match the labels on the defective PWB.

9. Install the new remote interface PWB using retained hardware.

10. Reconnect D-sub connectors W20P2 and W21P2, Cat5E connector W29P2 and all customer
interface wiring to the new remote interface PWB.

11. Close the front door and return the transmitter to service.

PAGE 4.1.54 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

COOLING FANS B1 - B15

B1 B2

B4 B5

B6

Front doors open for clarity

FAN COVERS
(secured with M5
screws at the top;
hooks at the bottom)

B13 B14

B15

B7 B8

B9

B10 B11

B12

Cooling Fan Replacement

Figure 4.1.18: Removing a Cooling Fan

VERSION 4.0 2018-02-26 PAGE 4.1.55

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

1. Identify the cooling fan(s) that is being replaced (see Figure 4.1.18 on page 4.1.55), noting the
function of each fan (e.g., B1 is splitter fan 1, B4 is 10 kW reject load fan 1, B7 is 5 kW reject load
fan 1, B10 is final reject load fan 1, etc.).

2. Open the transmitter’s front doors.

3. Remove the appropriate fan cover by removing and retaining the two or four M5 screws at the top
and lifting the panel out. The bottom of the panel has hooks that fit into slots.

4. Disconnect the suspect fan’s mating plug (B1P1 through B3P1 from its associated mate on reject
load/splitter interface PWB A28, B4P1 through B9P1 from its associated mate on reject load/
splitter interface PWB A30, or B10P1 through B15P1 from its associated mate on reject load/
splitter interface PWB A51).

5. Remove the suspect fan (including connector) by removing and retaining the two M3 screws that
secure the fan to the transmitter. Retain the fan’s finger guard (Nautel Part # HAA63).

Obtain a replacement fan (Nautel Part # ZAP50) from the site spares kit or station spares kit, if

6.

purchased or a suitable equivalent (vendor part # is Minebea Motor Mfg. Corp. 3115RL-07W-B79-E51)

.

7. Install the replacement fan, and fan finger guard, using retained screws from Step 5. Torque
hardware to 1.0 inch-pound only to avoid cracking the fan’s body.

8. Connect the replacement fan’s mating plug to the appropriate mate on reject load/splitter interface
PWB A28, A30 or A51, as applicable.

9. Reinstall the fan cover(s) using the retained screws from Step 3.

10. Close the transmitter’s front doors.

PAGE 4.1.56 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Reject Load or Reject Load/Splitter Interface Assembly Replacement

Using Figure 4.1.19 as a guide, replace one of the four reject load assemblies or one of the three reject
load/splitter interface assemblies as detailed in this section. Identify the affected 4-input reject load,
possibly named in an alarm reference and then replace it, as follows:

 A29 - accepts the four 5 kW reject power inputs (RF power modules 1-2, 3-4, 5-6 and 7-8) (see

“Reject Load Replacement”)

 A50 - accepts the four 5 kW reject power inputs (RF power modules 9-10, 11-12, 13-14 and 15-16)

(see “Reject Load Replacement”)

 A31 - accepts the four 10 kW reject power inputs (RF power modules 1-4, 5-8, 9-12 and 13-16)

(see “Reject Load Replacement”)

 A52 - accepts the two 20 kW reject load power inputs (RF power modules 1-8 and 9-16 and the

final (40 kW) reject load input (RF power modules 1-16) (see “Reject Load Replacement”)

 Reject Load/Splitter Interface Assembly (A28, A30 and A51) - see “Reject Load/Splitter Interface

Assembly Replacement” on page 4.1.59

Reject Load Replacement

See Figure 4.1.19 on page 4.1.58.

1. Open the appropriate front door and remove the appropriate upper, rear panel.

2. From the front of the transmitter:

 Gain access to the suspect reject load [A29 or A50 (5 kW), A31 (10 kW) or A52 (20 kW/final)]

by removing the appropriate fan cover (M5 screws at the top and hooks in the bottom) and
lifting the panel out.

 Temporarily remove the reject load/splitter interface assembly (see “Reject Load/Splitter

Interface Assembly Replacement” on page 4.1.59)

 Remove the four M4 screws that secure the reject load assembly to the transmitter.

3. From the rear of the transmitter:

 Disconnect all of the reject load assembly’s mating connectors.

 Slide out the reject load assembly, noting there are hooks in the reject load that fit into slots of

its support tray.

4. Obtain a replacement reject load assembly (Nautel Part # NAL17) and install by reversing the
instructions in steps 1 through step 3.

VERSION 4.0 2018-02-26 PAGE 4.1.57

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Remove the appropriate cooling
fan cover (two or four M5 screws
at the top; hooks at the bottom) to
access reject load securing
screws and mating cables

PARTIAL FRONT VIEW

(front panels removed)

PARTIAL REAR VIEW

(panels removed)

4-Input Reject Load A52

Reject Load/Splitter
Interface Assembly

A28

4-Input Reject Load A31

4-Input Reject Load A29

4-Input Reject Load A50

Reject Load/Splitter
Interface Assembly

A30

Reject Load/Splitter

Interface Assembly

A51

Figure 4.1.19: Replacing a Reject Load or Splitter Interface Assembly

PAGE 4.1.58 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Reject Load/Splitter Interface Assembly Replacement

See Figure 4.1.19 on page 4.1.58.

1. Open the appropriate front door and remove the appropriate upper, rear panel.

2. From the front of the transmitter:

 Gain access to the reject load/splitter interface assembly (A28, A30 or A51) by removing the

appropriate fan cover (M5 screws at the top and hooks in the bottom) and lifting the panel
out.

 Remove the two M5 screws that secure the reject load/splitter interface assembly to the

transmitter.

3. From the rear of the transmitter:

 Disconnect the mating connectors from the reject load/splitter interface assembly (A28. A30

or A51).

 Pull out the reject load/splitter interface assembly.

4. Obtain a replacement reject load/splitter interface assembly (Nautel Part # NAX269) and install it
by reversing the instructions in steps 1 through step 3.

VERSION 4.0 2018-02-26 PAGE 4.1.59

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

M5 securing

hardware

Controller

Module A4

PARTIAL FRONT VIEW

(front doors open)

PARTIAL REAR VIEW

(panels removed)

Controller Replacement

Figure 4.1.20: Location of Controller Module

1. If possible, use the controller’s front panel UI and the remote AUI to record all custom user settings
including: network settings, preset/audio settings, user accounts, logs, SNMP configuration, email
configuration, time zone, notifications and playlists. It is recommended that all User Settings be
logged prior to replacing the controller module and then restored upon completion of the change.

2. Press RF Off. Turn off and lock out the transmitter’s main ac power.

3. Open the front door and remove the upper, rear panel.

4. From the rear of the transmitter, disconnect the mating connectors from the controller
module (A4).

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5. From the front of the transmitter, remove the two M5 screws that secure the controller module to
the transmitter and pull out the controller module. If you are replacing the controller module’s
controller PWB (A2), see “Controller PWB Replacement - Controller” on page 4.1.65.

6. Obtain a replacement controller module (Nautel Part # NAC118C) and install it by reversing the
instructions in Step 4 and Step 5.

7. Enable and turn on ac power to the transmitter.

CAUTION! There are two possible configurations for the controller module being

installed, each with a potential different effect on transmitter operation.

– A “blank” controller module, which is the typical configuration shipped by Nautel,

will take on the transmitter’s profile (transmitter type, calibration data, etc.) upon
installation. It should require no additional configuration or setup.

– A “configured” controller module is one that has been configured for a specific

customer’s transmitter. Upon installation, the transmitter will take on the controller’s
profile. If this controller was not configured for the transmitter it was installed in,
your transmitter’s operational characteristics may change. If this occurs, CONTACT
NAUTEL to restore proper operation.

8. Use the remote AUI’s System Settings -> Upgrade Software page to view the Details of the
installed software. Upgrade software as required. See the Operations & Maintenance Manual and
any applicable Nautel-supplied Information Sheets for detailed instructions.

9. Restore all custom user settings that were recorded in Step 1.

10. Ensure the transmitter configuration is restored in the Controller’s UI HW Config menu by
selecting Installed Exciter (A/B), LVPS Hardware (correct number of LVPS modules) and UPS
Installed (yes/no). See the Operations & Maintenance Manual for detailed instructions.

11. With RF off and the system interlock circuit intact (closed), use the controller’s front panel UI to
initiate a Xmtr PA Bias routine (see Main Menu -> System Settings -> Factory Settings ->

Calibration

; refer to the Operations and Maintenance Manual for more detail).

12. Close the transmitter’s front door and install the upper, rear, right-hand side panel.

13. Restore the transmitter to the desired operational state.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

W1P1

(mates with

COM3)

NOTE:
Flash Card (U5)

(is removed from old SBC)

P7

(mates with

F_PANEL)

P5

(mates with

CPU12V1)

W5P2

(mates with

USB2_3)

W6P1

(mates with COM4)

COM2

(connects to COM
port on rear panel of
controller)

P9

(mates with

USB0_1)

W4P2

(mates with USB4_5)

Refer to the Wiring /Connector Lists (section 4.3 of this manual) for detailed

connector mating information for the controller module and SBC

Single-Board Computer (SBC) Replacement

Using Figure 4.1.21 as a guide, replace the controller module’s (NAC118C) single-board computer (SBC)
(A4A1) as follows:

Figure 4.1.21: Single-Board Computer A4A1 (inside controller module A4)

PAGE 4.1.62 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

1. Switch off (disable) the transmitter’s ac power source.

2. Open the front door and remove the rear filter panel that provides access to the controller module
(A4). Remove the controller module (A4) as detailed in “Controller Replacement” on page 4.1.60,
noting that some of the SBC’s mating connectors are connected via the controller’s rear panel.

3. Remove the controller’s top cover to gain access to the SBC (see Figure 4.1.21 on page 4.1.62).
Disconnect the remaining mating connectors from the SBC. At the rear panel, remove any securing
hardware for connectors that protrude through the rear panel. Retain all hardware for re­installation. Remove the SBC from the controller module by removing five M3 securing screws.

4. Locate or obtain the replacement SBC (Nautel Part # 207-8710-01). The replacement SBC does not
contain a compact flash card (A1U5). Obtain the card from the SBC removed in Step 3 and insert it
into the replacement SBC. This saves re-entering all the CF card related saved content. Ensure the
compact flash card has latest software available.

NOTE

: If a replacement compact flash card is used, various settings (User Accounts, Network Setup,
Email Configuration, Notifications, NTP Servers) will have to be reentered as this information and
logged data is not saved in the transmitter.

5. Install the replacement SBC using five M3 securing screws. Use Figure 4.1.21 on page 4.1.62 to
reconnect all mating connectors.

6. Switch on (enable) the transmitter’s ac power source. Ensure RF is off.

7. From the AUI’s System Settings page, select Upgrade Software and view the files in the

Boot Image

from the list (e.g., V4_0) and press the About button. Information about the transmitter device’s
current software versions and the selected upgrade file should appear (see Figure 4.1.22 on page

4.1.64).

8. For each device shown in Figure 4.1.22 on page 4.1.64, compare the Current Version column with
the Upgrade Version column. If the Upgrade Version value is a higher number, an upgrade is
available for that device from the selected software upgrade file. If desired, close the Upgrade
Information screen and upgrade the software by pressing Begin.

NOTE:

Pressing

list. These are the files on the compact flash card. Select the latest version of software

Begin

initiates the software upgrade process. Contact Nautel if you are unsure if you

should perform a software upgrade. For more details on performing a software upgrade, see

Software” on page 3.4.1

of the Operations and Maintenance Manual.

Select A

“Upgrading

VERSION 4.0 2018-02-26 PAGE 4.1.63

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

indicates a controller upgrade

is available in version 2.7.0.3

Figure 4.1.22: Upgrade Software - About screen

PAGE 4.1.64 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

TOP VIEW

(cover removed)

CONTROLLER

PWB

A2

Controller PWB Replacement - Controller

Using Figure 4.1.23 as a guide, replace the controller module’s controller PWB (A4A2) as follows:

Figure 4.1.23: Controller PWB Location - Controller Module top view

1. Remove the controller module (A4) as described in “Controller Replacement” on page 4.1.60.

2. Place the controller module on a suitable work surface. Remove the top cover. Retain hardware for

3. Disconnect all mating plugs from the controller PWB (A2) inside the controller module.

4. At the rear panel, remove any securing hardware for connectors that protrude through the rear

VERSION 4.0 2018-02-26 PAGE 4.1.65

re-installation.

panel. Retain all hardware for re-installation.

– Locate the two DB-25 connectors (J5A and J5B) and the three DB-9 connectors (J6A, J6B and J8) on the rear panel.

Using a 5 mm nut driver or socket, remove the mounting nuts.

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

5. Remove the three small Phillips screws, which mount the front of the controller PWB to the chassis,
located along the edge of the controller PWB. Retain hardware for re-installation.

6. Slightly lift the front edge of the controller PWB and pull towards the front of the controller.

7. Locate or obtain a replacement controller PWB (Nautel Part # NAPC163).

CAUTION! When re-installing the controller PWB, lift the PWB high enough so that

the mounting pillars do not damage parts on the underside of the PWB.

8. Install the replacement controller PWB. Replace all hardware for the through-chassis connectors.

9. Install the three Phillips screws that mount the front of the controller PWB to the chassis.

10. Reconnect all internal cables to the controller PWB. If necessary, refer to Section 4.3 (Wiring/
Connector Lists) of this manual for connector mating details for A2.

11. Reinstall the controller’s top cover.

12. Remove the “Interlock” jumper, if applicable, from J5A of the original controller PWB and reinstall
it on the new controller PWB between J5A pins 19 and 20.

13. Re-install the controller in the transmitter and reconnect all external mating connectors, removed
previously. Restore all previous settings as described in “Controller Replacement” on page 4.1.60.

PAGE 4.1.66 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

M5 securing

hardware

PARTIAL FRONT VIEW

(front doors open)

PARTIAL REAR VIEW

(panels removed)

Exciter A (A5)

Exciter B (A6)

(optional)

Exciter Replacement

Figure 4.1.24: Location of Exciter Module

1. For dual exciter transmitters, ensure the other exciter (A5 or A6) is operating as the main RF drive
source and disable automatic changeover (see the Operations & Maintenance Manual).

NOTE: If it is not possible to operate the other exciter or your transmitter is single-exciter only, press RF

Off and turn off the transmitter’s main ac power source.

2. Open the transmitter’s front door and remove the upper, rear, right-hand side panel.

3. From the rear of the transmitter, disconnect the mating connectors from the appropriate exciter
module (A5 or A6).

VERSION 4.0 2018-02-26 PAGE 4.1.67

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

4. From the front of the transmitter, remove the two M5 screws that secure the exciter module to the
transmitter and pull out the exciter module. If you are replacing the exciter module’s exciter/control
PWB (A1), see “Exciter/Control PWB Replacement - Exciter” on page 4.1.69.

5. Obtain a replacement exciter module (Nautel Part # NAE107A or newer) and install it by reversing
the instructions in Step 3 and Step 4.

6. Close the transmitter’s front door and re-install the upper, rear, right-hand side panel.

7. If it was necessary to turn RF off and disable ac power in Step 1, enable and turn on ac power to
the transmitter.

8. Restore the transmitter to the desired operational state. If the replacement exciter is intended to be
the main RF drive source, use the Changeover menu to establish the main/active exciter. Restore
the automatic changeover setting, if applicable.

PAGE 4.1.68 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

TOP VIEW

(cover removed)

EXCITER/

CONTROL

PWB

A1

Exciter/Control PWB Replacement - Exciter

Using Figure 4.1.25 as a guide, replace the exciter module’s exciter/control PWB (A5A1 or A6A1) as
follows:

Figure 4.1.25: Exciter/Control PWB Location - Exciter

1. Remove the exciter module (A5 or A6, as applicable) as described in “Exciter Replacement” on

2. Place the exciter module on a suitable work surface. Remove the top cover. Retain hardware for re-

3. Disconnect all mating plugs from the exciter/control PWB (A1), inside the exciter.

VERSION 4.0 2018-02-26 PAGE 4.1.69

page 4.1.67.

installation.

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

4. At the rear panel, remove any securing hardware for connectors that protrude through the rear
panel. Retain all hardware for re-installation.

– Locate the two DB-9 connectors (J3A and J3B) and the DB-15 connector (J5) on the rear panel. Using a 5 mm nut

driver or socket, remove the mounting nuts.

– Locate the AES/EBU XLR audio connector (J4) on the rear panel. Remove the two small pan-head Phillips screws.

– Remove the silver push button connector lock (“push” lever) on the XLR connector. Locate the HAS78 removal tool

from the ancillary kit, provided with the transmitter. Follow the manufacturer's instructions in

Figure 4.1.26 on

page 4.1.71 to remove the push button. You will need access to the front and rear of the receptacle to remove it.

Figure 4.1.27 on page 4.1.71. Remove the locking rings from five BNC connectors (J6, J7A, J7B, J8A and

– See

J8B). To remove the locking rings, use small 4 - 6 inch slip-jaw pliers. In a counter-clockwise direction, gently
loosen (do not tightly pinch or deform) each locking ring. Typically, half a turn with the pliers will loosen a locking
ring enough to remove it by hand. Remove and retain the locking rings.

5. Remove the four small Phillips screws, which mount the front of the exciter/control PWB to the
chassis, located along the edge of the exciter/control PWB. Retain hardware for re-installation.

6. Slightly lift the front edge of the exciter/control PWB and pull towards the front of the exciter.

7. Locate or obtain a replacement exciter/control PWB (Nautel Part # NAPE86A or newer). Remove
the “push” lever from the XLR connector as detailed in Step 4.

CAUTION! When re-installing the exciter/control PWB, lift the PWB high enough so

that the mounting pillars do not damage parts on the underside of the PWB.

8. Install the replacement exciter/control PWB. Replace all hardware for the through-chassis
connectors. Take care not to over-tighten the BNC connector locking rings.

9. Install the four Phillips screws that mount the front of the exciter/control PWB to the chassis.

10. Install the “push” lever into the XLR connector. Align it with the slot located on the top section of
the connector body and gently press it into position.

11. Reconnect all internal cables to the exciter/control PWB. If necessary, refer to Section 4.3 (Wiring/
Connector Lists) of this manual for connector mating details for A1.

12. Reinstall the exciter’s top cover.

13. Re-install the exciter in the transmitter and reconnect all external mating connectors, removed
previously. Restore all previous settings as described in “Exciter Replacement” on page 4.1.67.

PAGE 4.1.70 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Figure 4.1.26: Removing the XLR connector’s “push” lever

Figure 4.1.27: Loosening the BNC connector’s locking ring

VERSION 4.0 2018-02-26 PAGE 4.1.71

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

TOP VIEW

(cover removed)

PRE-AMPLIFIER
PWB

A3

Pre-Amplifier PWB Replacement - Exciter

Using Figure 4.1.28 and Figure 4.1.29 on page 4.1.73 as guides, replace the exciter module’s pre­amplifier PWB (A5A3) as follows:.

Figure 4.1.28: Pre-Amplifier PWB Location - Exciter

1. Remove the exciter module (A5) as described in “Exciter Replacement” on page 4.1.67.

2. Place the exciter module on a suitable work surface. Remove the top cover. Retain hardware.

3. Loosen the plastic nut that secures voltage regulator U1 to its heatsink (see Figure 4.1.29 on page

4.1.73). Remove and retain the plastic nut and washer.

4. Unsolder U1’s three mounting leads from the pre-amplifier PWB and carefully pull it away from its
heatsink. This should also allow you to remove the heatsink and insulator for U1. Retain U1, its
heatsink and its insulator.

5. Unsolder and remove the four solder connections to the defective pre-amplifier PWB. They include
three 20 AWG links (to pads B, C and D) and a coaxial connection (to pads A and E).

PAGE 4.1.72 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

M4 SECURING

SCREWS (QTY 6)

PLASTIC

HARDWARE

FOR U1

HEATSINK

FOR U1

WIRES TO UNSOLDER

(4 PLACES)

PADS

A and E

PAD B

PAD C

PAD D

INSULATOR

U1 LEADS TO

UNSOLDER

Figure 4.1.29: Pre-Amplifier PWB Assembly Detail

VERSION 4.0 2018-02-26 PAGE 4.1.73

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

6. Remove the six M3 screws securing the pre-amplifier PWB to the heat sink. Carefully remove the
pre-amplifier PWB from the exciter, taking care not to damage any of the links and wiring close to
the PWB.

7. Obtain the replacement NAPA35 pre-amplifier PWB from the station spares kit, if purchased.

NOTE: FETs are static sensitive and must be handled in a static protected manner.

8. Spread a small amount of thermal compound (Nautel Part # HAG39, from the station spares kit),
thinly and evenly, on the bottom of the new pre-amplifier PWB.

9. Secure the pre-amplifier PWB on the exciter’s heat sink using the six screws removed in Step 6.
Ensure correct orientation. Tighten the screws.

10. Re-solder the four connections removed in Step 5.

11. Re-install voltage regulator U1, its insulator and its heatsink on the plastic screw (see Figure 4.1.29

on page 4.1.73 for proper orientation). Ensure the leads of U1 are correctly positioned to allow re-

soldering to the three pads on the pre-amplifier PWB. Secure the items using the nut and washer
removed in Step 3 and torque hardware to 2 inch-pounds (0.22 Newton-meters).

12. Re-solder the three leads of U1 to the pre-amplifier PWB.

13. Re-install the exciter module’s top cover, using retained hardware, and re-install the exciter module
in the transmitter as described in “Exciter Replacement” on page 4.1.67.

14.

PAGE 4.1.74 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

M3 securing
hardware
(14 nuts/
washers for
each PWB)

PARTIAL REAR VIEW

(panels removed)

A3

A18

A34

A42

Module Control/

Interface PWB

(Rack 1)

Module Control/

Interface PWB

(Rack 2)

Module Control/

Interface PWB

(Rack 3)

Module Control/

Interface PWB

(Rack 4)

M3 securing
hardware
for card-edge
connectors
(2 sets per
card, 8 sets per
PWB); remove
from the front

Module Control/Interface PWB Replacement

Using Figure 4.1.30 as a guide, replace one of the module control/interface PWBs (A3, A18, A34, A42)
as follows:

Figure 4.1.30: Module Control/Interface PWB Location

VERSION 4.0 2018-02-26 PAGE 4.1.75

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

1. Turn off (disable) and lock out the transmitter’s ac power source, and UPS source (to LVPS), if
applicable.

2. Identify the suspect module control/interface PWB, using the associated transmitter alarms, noting
there are four [A3 (Rack 1), A18 (Rack 2), A34 (Rack 3) and A42 (Rack 4)]. Remove the
transmitter’s appropriate upper, rear panel and open the front door.

3. From the front of the transmitter, remove the RF power modules that are mated with the suspect
module control/interface PWB.

4. Disconnect the mating connectors from the suspect module control/interface PWB.

5. Remove 14 sets of M3 nuts and washers that secure the module control/interface PWB to the
transmitter. Remove eight M3 screws that connect the PWB’s edge-card connectors to the
transmitter. Pull out the module control/interface PWB.

6. Obtain a replacement module control/interface PWB (Nautel Part # NAPC158B) and install it by
reversing the instructions in Step 1 through Step 5.

7. From the rear of the transmitter, set DIP switch S1 on the NAPC158B as follows:

S1 Position

6 OFF (right) OFF (right) OFF (right) OFF (right)

5 (F BTLDR) OFF (right) OFF (right) OFF (right) OFF (right)

4 (RS485 TERM) ON (left) OFF (right) OFF (right) OFF (right)

3 (ADDR 1) ON (left) OFF (right) ON (left) OFF (right)

2 (ADDR 2) ON (left) ON (left) OFF (right) OFF (right)

1 OFF (right) OFF (right) OFF (right) OFF (right)

A42S1 Setting
(Rack 4)

A34S1 Setting
(Rack 3)

A18S1 Setting
(Rack 2)

A3S1 Setting
(Rack 1)

8. Re-install the RF power modules.

9. Enable and turn on ac power to the transmitter.

10. Ensure new PWB has the same software as the original, and if necessary, perform a software
upgrade. Refer to the Operations and Maintenance manual for instructions.

11. The calibration data for the NAPC158B PWB must be synced from the controller. To sync the cal
data, navigate the UI menu as follows:

– System Settings -> Factory Settings -> Calibration -> Cal Backup -> Sync Cal -> Send Cal to

Racks

PAGE 4.1.76 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

12. Return the transmitter to service.

VERSION 4.0 2018-02-26 PAGE 4.1.77

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Power Supply

Interface PWB

(Rack 1) A1

Power Supply

Interface PWB

(Rack 2) A17

PARTIAL REAR VIEW

(panels removed)

Power Supply

Interface PWB

(Rack 3) A33

Power Supply

Interface PWB

(Rack 4) A41

Power Supply Interface PWB Replacement

Using Figure 4.1.31 as a guide, replace one of the power supply interface PWBs (A1, A17, A33, A41) as
follows:

Figure 4.1.31: Power Supply Interface PWB Location

1. Turn off and lock out the transmitter’s main ac power, and UPS source (to LVPS modules), if
applicable.

2. Identify the suspect power supply interface PWB, using the associated transmitter alarms, noting
there are four [A1 (Rack 1), A17 (Rack 2), A33 (Rack 3) and A41 (Rack 4)].

3. Remove the transmitter’s appropriate lower, rear panel and open the front door.

PAGE 4.1.78 VERSION 4.0 2018-02-26

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4. From the front of the transmitter, pull the power supply modules that are mated with the suspect
power supply interface PWB forward so that they disengage from the PWB.

5. From the rear of the transmitter, disconnect the mating connectors and wiring from the suspect
power supply interface PWB. Record the placement of all wiring and jumpers to ensure the
replacement PWB connections are identical.

6. Remove 24 sets of M3 nuts and washers that secure the power supply interface PWB to the
transmitter and pull out the power supply interface PWB.

7. Obtain a replacement power supply interface PWB (Nautel Part # NAPI150A/01) and install it by
reversing the instructions in Step 1 through Step 6.

8. Re-install the power supply modules.

9. Enable and turn on ac power to the transmitter.

10. Return the transmitter to service.

UPS Interface Power Supply Replacement

See Figure 4.1.32 on page 4.1.80.

1. Turn off and lock out the transmitter’s main ac power.

2. Remove the rear, right-hand top panel, which is secured with 1/4-turn fasteners.

3. From the rear of the transmitter:

 Disconnect the power cable to the UPS Interface assembly by removing the 220 V ac plug

(Nautel Part # JD43) from the UPS Interface assembly at J1.

 Remove the six M4 screws that secure the UPS Interface to the transmitter and retain.

Disconnect the wiring from the terminal block on the defective power supply (Nautel part #
UG31), noting connections.

 Remove the UPS Interface assembly from the transmitter to gain access to the four M4 screws

that secure power supply from underneath. Remove the four M4 screws and retain.

VERSION 4.0 2018-02-26 PAGE 4.1.79

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

COVER REMOVED

FOR CLARITY

220 V ac
UPS INPUT
(J1)

UG31 POWER
SUPPLY

4. Obtain the replacement power supply (Nautel Part # UG31) and install in the UPS assembly using
the four M4 screws retained in step 3. Apply ac power to the UPS interface only. Use a DMM to
monitor the dc voltage between the +V and -V terminals of the UG31. Adjust the power supply
output voltage potentiometer until the DMM reads 30 V dc.

CAUTION! There are high voltages present. It is recommended to use a shrouded

adjustment tool to avoid shorting the ac voltage to the chassis.

5. Install the UPS Interface assembly in the transmitter by reversing the instructions in steps 2 and
step 3.

6. Enable and turn on ac power to the transmitter.

7. Return the transmitter to service.

Figure 4.1.32: UPS Interface Assembly

PAGE 4.1.80 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Power Module Combiner PWB (NAPH06) Replacement

1. Disable the associated NAA61 RF power module using the “Enable/Disable” switch located on the
front of the RF power module (switch down). The power module status LED should turn red.

2. Remove the two (2) M5 Phillips screws securing the RF power module to the transmitter rack and

retain hardware.

NOTE:

If unable to remove the power module, ensure the M8 shipping bolt in the

rear of the module has been removed.

3. Remove the RF power module from the transmitter rack and place on a suitable work bench. See

Figure 4.1.33 for proper orientation on work bench for top cover removal.

Figure 4.1.33: RF Power Module Orientation

4. Remove the top cover (11 x M3 Phillips screws) and retain hardware.

WARNING

Resistors R1 through R6 (Nautel part # RT69) contains Beryllium Oxide
(BeO). These devices are non-hazardous during normal device operation and under
normal device failure conditions. DO NOT cut, crush or grind devices because the
resulting dust may be HAZARDOUS IF INHALED. Unserviceable devices should be
disposed of as harmful waste

5. Using a standard soldering iron, remove the high-power resistors (R1 through R6; Nautel Part #
RT69) by first unsoldering their leads from the PWB traces (both sides) and then removing the
resistor securing screws (2 M3 Phillips screws per resistor); retain hardware. See Figure 4.1.34 on

page 4.1.82.

6. Using the standard iron, Unsolder the power amplifier output links from both the combiner PWB
input (pads F and G) and the power amplifier (PA) PWB outputs; retain links.

VERSION 4.0 2018-02-26 PAGE 4.1.81

.

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Figure 4.1.34: NAPH06 Combiner PWB De-soldering locations

7. Using the standard iron, unsolder wire #05 (white coaxial cable marked with “-05”) reject power
sample coaxial cable core from pad C and shield from pad E. Tie back cable temporarily.

8. Unsolder the larger combiner connections (two places, spades A and B) using a Weller SP80L
(80 W) or equivalent soldering iron. Ensure combiner connections (copper straps) are cleaned in
preparation for the replacement combiner PWB.

9. Remove eight (8) M3 Phillips screws that mount the combiner PWB; retain hardware.

10. Remove the combiner PWB (A6). Clean residual thermal paste from the heat sink surface where
the high power resistors (R1 to R6) were mounted.

11. Install replacement combiner PWB and secure using eight (8) M3 Phillips screws retained in Step 9.
Torque screws to 6 lb-in.

12. Solder larger connections (copper straps) at pads A and B, using the Weller SP80L (80 W) soldering
iron or equivalent.

CAUTION:

Do not apply excessive solder; prevents overflow of solder down into

the hybrid combiner region.

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

13. Re-install the power amplifier output links between the combiner pads F and G and the PA outputs
using the standard soldering iron. If links are damaged, use tinned copper wire (Nautel part #
WF09) to make new links.

14. Apply a very thin and evenly distributed layer of thermal paste (Nautel part # HAG39 to the bottom
of the high power resistors (Nautel Part # RT69). Install the resistors in the R1 through R6 position
on the combiner PWB by first securing the two (2) M3 Phillips screws retained in Step 5 and torque
to 6 lb-in.

15. Solder the high power resistor leads (both sides) to the associated combiner PWB pads using the
standard iron.

CAUTION:

Do not apply excessive solder; avoid solder wicking up the lead towards

the resistor body, as the bend in the lead provides thermal strain relief.

16. Solder wire #05 (reject power sample coaxial cable) core to pad C and shield to pad E using the
standard iron.

CAUTION:

Ensure there are no short circuits between the core and the shield;

measure with DMM set to resistance and ensure greater than 40 k ohms.

17. Install top cover using hardware retained in Step 4.

18. Return the NAA61 RF power module to the transmitter rack and secure in place using hardware
retained in Step 2 and the M8 shipping bolt (if used). Enable the power module using the front
“Enable/Disable”switch (switch up). The power module status LED should be green.

19. Return to normal operation and via the RF Module Meter Summary screen, ensure that the
associated RF power module reject power meter is equal to the remaining power module’s reject
power meter readings (± 50 W).

VERSION 4.0 2018-02-26 PAGE 4.1.83

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Power Module Combiner PWB (PR82C) Replacement

1. Disable the associated NAA61 RF power module using the “Enable/Disable” switch located on the
front of the RF power module (switch down). The power module status LED should turn red.

2. Remove the two (2) M5 Phillips screws securing the RF power module to the transmitter rack and

retain hardware.

NOTE:

If unable to remove the power module, ensure the M8 shipping bolt in the

rear of the module has been removed.

3. Remove the RF power module from the transmitter rack and place on a suitable work bench. See

Figure 4.1.35 for proper orientation on work bench for top cover removal.

Figure 4.1.35: RF Power Module Orientation

4. Remove the top cover (11 x M3 Phillips screws) and retain hardware.

WARNING

Resistors R1 and R2 (Nautel part # RT69) contains Beryllium Oxide
(BeO). These devices are non-hazardous during normal device operation and under
normal device failure conditions. DO NOT cut, crush or grind devices because the
resulting dust may be HAZARDOUS IF INHALED. Unserviceable devices should be
disposed of as harmful waste

5. Using the standard soldering iron, remove the high-power resistors (R1 and R2; Nautel Part #
RT69) by first unsoldering their leads from the PWB traces (both sides) and then removing the
resistor securing screws (2 M3 Phillips screws per resistor); retain hardware. See Figure 4.1.36 on

page 4.1.85.

6. Using the standard iron, Unsolder the power amplifier output links from both the combiner PWB
input (pads D and E) and the power amplifier (PA) PWB outputs; retain links.

PAGE 4.1.84 VERSION 4.0 2018-02-26

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GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

Figure 4.1.36: PR82C Combiner PWB De-soldering locations

7. Unsolder the larger combiner connections (two places, spades A and B) and output connector link
(pad C) using the Weller SP80L (80 W) or equivalent soldering iron. Ensure combiner and output
connections (copper straps/link) are cleaned in preparation for the replacement combiner PWB.

8. Remove eight (8) M3 Phillips screws that mount the combiner PWB; retain hardware.

9. Remove the combiner PWB (A7). Clean residual thermal paste from the heat sink surface where
the high power resistors (R1and R2) were mounted.

10. Install replacement combiner PWB and secure using eight (8) M3 Phillips screws retained in Step 8.
Torque screws to 6 lb-in.

11. Solder larger connections (copper straps) at pads A and B and connector link at pad C, using the
Weller SP80L (80 W) soldering iron or equivalent.

CAUTION:

Do not apply excessive solder; prevents overflow of solder down into

the hybrid combiner region.

12. Re-install the power amplifier output links between the combiner pads D and E and the PA outputs
using the standard soldering iron. If links are damaged, use tinned copper wire (Nautel part #
WF09) to make new links.

VERSION 4.0 2018-02-26 PAGE 4.1.85

GV40/GV30 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS

13. Apply a very thin and evenly distributed layer of thermal paste (Nautel part # HAG39) to the
bottom of the high power resistors (Nautel Part # RT69). Install the resistors in the R1 and R2
position on the combiner PWB by first securing the two (2) M3 Phillips screws retained in Step 5
and torque to 6 lb-in.

14. Solder the high power resistor leads (both sides) to the associated combiner PWB pads using the
standard iron.

CAUTION:

Do not apply excessive solder; avoid solder wicking up the lead towards

the resistor body, as the bend in the lead provides thermal strain relief.

15. Install top cover using hardware retained in Step 4.

16. Return the NAA61 RF power module to the transmitter rack and secure in place using hardware
retained in Step 2 and the M8 shipping bolt (if used). Enable the power module using the front
“Enable/Disable”switch (switch up). The power module status LED should be green.

17. Return to normal operation and via the RF Module Meter Summary screen, ensure that the
associated RF power module reject power meter is equal to the remaining power module’s reject
power meter readings (± 50 W).

PAGE 4.1.86 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL PARTS LISTS

SECTION 4.2: PARTS LISTS

This section contains reference designation lists that provide descriptive and provisioning information
for all electrical and mechanical parts that have an assigned reference designation and form a part of
the subject equipment.

Topics in this section include

 Family Tree

 How to Locate Information About a Specific Part

 Column Content on page 4.2.2

Family Tree

Figure 4.2.1 on page 4.2.4 to Figure 4.2.3 on page 4.2.6 depict the family tree for the subject equipment.

It is based on the descending order of the reference designation hierarchy and identifies all assemblies
that have an assigned Nautel configuration control number.

How to Locate Information About a Specific Part

To locate the information for a specific part, the assigned reference designation for the part must be
known. In addition, the Nautel nomenclature (e.g., NAA61C) assigned to the assembly containing the
part or the full reference designation, including the reference designation of all higher assemblies, must
be known.

When the Nautel Nomenclature is Known:

 Refer to the family tree (Figure 4.2.1 on page 4.2.4 to Figure 4.2.3 on page 4.2.6) and identify the

block(s) associated with the Nautel nomenclature. Locate the part's reference designation in the
identified reference designation list in this section, noting they are sorted alphanumerically.

VERSION 4.0 2018-02-26 PAGE 4.2.1

GV40/GV30 TROUBLESHOOTING MANUAL PARTS LISTS

When the Reference Designation is Known:

 Refer to the family tree depicted in Figure 4.2.1 on page 4.2.4 to Figure 4.2.3 on page 4.2.6 with the

full reference designation.

 Follow the family tree branches to the block that represents the lowest level assembly assigned a

Nautel configuration control number, then locate the reference designation information for that
Nautel configuration control number.

 Locate the part's reference designation and associated Nautel Part # in the list provided at the end

of this section. In a PDF manual, use Ctrl-F (find) to quickly locate the reference designation.

Reference Designation Lists

Reference designation lists are provided for:

 assemblies that are assigned an alpha-prefixed Nautel nomenclature (e.g., NAA61C)

 cable harnesses that are assigned a numbered Nautel part (e.g., 219-8401-01)

 optional kits that are assigned a numbered Nautel part

To obtain the full reference designation for a specific part the Nautel configuration control number must
be located in the family tree (Figure 4.2.1 on page 4.2.4 to Figure 4.2.3 on page 4.2.6) to include the
reference designation of all higher level assemblies. The reference designation lists are presented in
alphanumeric order - for each component level of the transmitter - are divided into columns to aid in
locating specific information.

Column Content

The following paragraphs provide an explanation of the purpose and contents of each column in the
part number indexes.

Component Level, Stock Code Column

This column contains the

Code

(part number) assigned to each part.

Component Level

number (01 through 10, as required) and the Nautel

Stock

PAGE 4.2.2 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL PARTS LISTS

Component Level

This number represents the level of a component in relation to the highest level parts list. In this case
the highest level parts list is the GV40/GV30’s overall parts list, or the top block in the family tree
shown in Figure 4.2.1 on page 4.2.4.

Components that are directly descended from the highest level parts list are component level 01. The
associated stock code and description for level 01 items appear in bold text in the reference designation
list, followed by their sub-assembly components, as applicable. Level 01 items are sorted
alphanumerically.

Components that are directly descended from component level 01 items are component level 02. The
associated stock code and description for level 02 items appear below their associated level 01
component, slightly indented, followed by their sub-assembly components, as applicable. Level 02
items are sorted alphanumerically

Component level 03 through 10 items, as applicable, descend similarly to component level 02 items,
with continuing indentations to identify each new level.

Stock Code

This number is Nautel's drawing number for Nautel manufactured parts, Nautel's configuration control
number for assemblies that are under configuration control management, or Nautel's inventory
management number for purchased parts. When a Nautel configuration control number (e.g., NAPC*)
is shown in this column, its sub-assembly reference designation items are listed below it.

NOTE:

This section includes Nautel part numbers only. It does not include original equipment
manufacturer (OEM) information (i.e., vendor part numbers). Some vendor information is provided in
the Responding to Alarms section of this manual, otherwise contact Nautel to order a replacement part
or to request assistance to find a suitable replacement.

Description Column

The

Description

presented first, followed by the adjective identifiers.

column contains the name and descriptive information for each part. The key word is

Reference Designation Column

The

Reference Designation

multiple reference designations apply to a part, they are sorted alphanumerically. These designations
are assigned in accordance with the requirements of American Society of Mechanical Engineers ASME
Y14.44-2008.

column contains the reference designation(s) for a specific part. When

VERSION 4.0 2018-02-26 PAGE 4.2.3

GV40/GV30 TROUBLESHOOTING MANUAL PARTS LISTS

F2190489 V2

A7A2

4-WAY SPLITTER PWB

NAPH10/02

A7

RF DRIVE SPLITTER ASSY

NAI23A

U1

DISPLAY, 20 x 4, LCD

UW146

A2

MONITOR FAN ASSEMBLY

NAX273A

40 kW or 30 kW FM BROADCAST TRANSMITTER

NARF75C/02

GV40/GV30

A8A7

COMBINER (RHS) PWB

PR82C

(used with NAE107A/01 only)

A5A8

EXGINE PWB

NAPE74C/01

A5A4

POWER AMPLIFIER PWB

NAPA31C

A7A1

SPLITTER PWB

NAPH09A

A4A4

UI INTERFACE PWB

NAPI142A/01

A4A2

CONTROLLER PWB

NAPC163

A4

CONTROLLER

NAC118C

A8A5

SPLITTER/INTERFACE PWB

NAPH05

A5A6

LED PWB

206-3060

A5A2

POWER SUPPLY DISTRIBUTION PWB

NAPS47C/01

RF POWER MODULE 2-4

(SAME AS A8)

A9 - A11

NAA61C

A8A6

COMBINER (LHS) PWB

NAPH06

EXCITER B

(OPTIONAL)

A6

SAME AS A5

RF POWER MODULE 1

A8

NAA61C

(OPTIONAL)

A5A7

ORBAN PWB

NAPX37

A5A3

PRE-AMP PWB

NAPA35

A4A1U5

MEMORY, COMPACT FLASH CARD, 8 GB

207-8707 (UB110 MOD)

A3

MODULE CONTROL/INTERFACE PWB

NAPC158B

A1

POWER SUPPLY INTERFACE PWB

NAPI150A/01

A8A1 - A8A4

PA PWB, LDMOS

NAPA31C

A5A5

OUTPUT POWER PROBE PWB

NAPP06/01

A4A3

POWER SUPPLY DISTRIBUTION PWB

NAPS49A

A5A1

EXCITER/CONTROLLER PWB

NAPE86A

EXCITER A

A5

NAE107B (Analog) or NAE107B/01 (HD)

A4A1

SINGLE BOARD COMPUTER

207-8710-01

Figure 4.2.1: GV40/GV30 Family Tree

PAGE 4.2.4 VERSION 4.0 2018-02-26

GV40/GV30 TROUBLESHOOTING MANUAL PARTS LISTS

F2190490 V1

A28A2

6-WAY FAN INTERFACE PWB

NAPI168

A28

REJECT LOAD/SPLITTER INTERFACE ASSY

NAX269

A24A1

10kW FILTER ASSY (LHS)

NAF118

A19

RF DRIVE SPLITTER ASSY

(SAME AS A7)

NAI23A

A17

POWER SUPPLY INTERFACE PWB

NAPI150A/01

A15A4

EXCITER RF SAMPLE PWB (A)

206-6524

A28A1

REJECT LOAD/SPLITTER INTERFACE PWB

NAPI67

A24

COMBINER/FILTER, 10 kW (LHS)

NAF119/04

A13

NOT USED

A26

COMBINER ASSY, 40 kW

NAH59/01

A15A2

REFLECTED RF SAMPLE PWB

206-6520

A15

OUTPUT POWER PROBE ASSY

NAFP109B

A15A6

DC REFLECTED POWER PROBE PWB

219-6520

RF DRIVE SPLITTER ASSY

A27

NAI26

A29

4-INPUT REJECT LOAD ASSY, 1500 W

NAL17

A18

MODULE CONTROL/INTERFACE PWB

NAPC158B

A15A3

RF MONITOR PWB

206-6522

A16

REMOTE INTERFACE PWB

NAPI143/02

A25

COMBINER ASSY, 20 kW (LHS)

NAH58/02

A27A1

RF DRIVE SPLITTER PWB

NAPH13/01

A29A1

4-INPUT REJECT PWB

206-8082

RF POWER MODULE 5-8

(SAME AS A8)

A20 - A23

NAA61C

A12A1

10kW FILTER ASSY (RHS)

NAF118/01

A15A1

FORWARD RF SAMPLE PWB

206-6524

A14

NOT USED

A15A5

EXCITER RF SAMPLE PWB (B)

206-6524

A12

COMBINER/FILTER, 10 kW (RHS)

NAF119/05

Figure 4.2.2: GV40/GV30 Family Tree (continued)

VERSION 4.0 2018-02-26 PAGE 4.2.5

GV40/GV30 TROUBLESHOOTING MANUAL PARTS LISTS

F2190491 V1

A52

4-INPUT REJECT LOAD ASSY, 1500 W

(SAME AS A29)

NAL17

A49

COMBINER ASSY, 20 kW (RHS)

NAH58/03

A50

4-INPUT REJECT LOAD ASSY, 1500 W

(SAME AS A29)

NAL17

A51

REJECT LOAD/SPLITTER INTERFACE ASSY

(SAME AS A28)

NAX269

U2

LOW VOLTAGE POWER SUPPLY 1A

UG92C

(OPTIONAL)

U12

LOW VOLTAGE POWER SUPPLY 2A

UG92C

(OPTIONAL)

U13

LOW VOLTAGE POWER SUPPLY 2B

UG92C

A42

MODULE CONTROL/INTERFACE PWB

NAPC158B

A35

RF DRIVE SPLITTER ASSY

(SAME AS A7)

NAI23A

A31

4-INPUT REJECT LOAD ASSY, 1500 W

(SAME AS A29)

NAL17

A43

RF DRIVE SPLITTER ASSY

(SAME AS A7)

NAI23A

A32

SPLITTER

(3 dB HYBRID COUPLER)

219-6400

RF POWER MODULE 9-12

(SAME AS A8)

A36 - A39

NAA61C

U4 - U11

RF MODULE POWER SUPPLY 1A - 4B

UG92C

A33

POWER SUPPLY INTERFACE PWB

NAPI150A/01

A40

COMBINER/FILTER, 10 kW (LHS)

(SAME AS A24)

NAF119/04

RF POWER MODULE 13-16

(SAME AS A8)

A44 - A47

NAA61C

A48

COMBINER/FILTER, 10 kW (RHS)

(SAME AS A12)

NAF119/05

U1

USER INTERFACE DISPLAY

UW146

(OPTIONAL)

U3

LOW VOLTAGE POWER SUPPLY 1B

UG92C

U14 - U37

RF MODULE POWER SUPPLY 5A - 16B

UG92C

A34

MODULE CONTROL/INTERFACE PWB

NAPC158B

A30

REJECT LOAD/SPLITTER INTERFACE ASSY

(SAME AS A28)

NAX269

A41

POWER SUPPLY INTERFACE PWB

NAPI150A/01

Figure 4.2.3: GV40/GV30 Family Tree (continued)

PAGE 4.2.6 VERSION 4.0 2018-02-26