Garmin GMR 18 xHD Field Service Manual

GMR™ 18/24 xHD and 18 HD+
Field Service Manual
The GMR 18/24 xHD and 18 HD+ radar generates and transmits non-ionizing
radiation. The radar must be turned off before approaching the scanner for
service. Avoid looking directly at the scanner while it is transmitting, as the
eyes are the most sensitive part of the body to electromagnetic radiation.
Failure to properly turn off the radar may expose the service technician to
harmful electromagnetic radiation that can result in personal injury or death.
The GMR 18/24 xHD and 18 HD+ radar contains high voltages. The scanner
must be turned off before the covers are removed. While servicing the unit, be
aware high voltages are present and take the necessary precautions. The high
voltages in the scanner can take some time to decay. Failure to adhere to this
warning can result in personal injury or death.
The GMR 18/24 xHD and 18 HD+ radar contains a magnetron. Persons
with a cardiac pacemaker should not perform any service to the radar that
may place them in close proximity to the magnetron. If a person with a
cardiac pacemaker fails to adhere to the warning, there is a danger that the
pacemaker may experience abnormal operation or failure.
Repairing and performing maintenance on Garmin electronics is complex
work that can result in serious personal injury or product damage if not done
correctly.
Use care when working near a magnetron with ferrous instruments. The
strong magnetic force of the magnetron will attract ferrous instruments, and
any contact with the magnetron could damage the magnetron. If possible, use
stainless steel or titanium instruments when working near the magnetron. If
specialty instruments are not available, use cardboard or a similar material to
act as a shield between the magnetron and a ferrous instrument.
Garmin is not responsible for, and does not warrant, the work that you or a
non-authorized repair provider perform on your product.
Important Information Regarding Field Service of the
GMR 18/24 xHD and 18 HD+ Radar
• Before performing any service to the radar, ensure that the system
software is up to date. If it is not, go to
latest software version and update the radar using an SD card. Proceed
with the service only if the software update does not resolve the issue.
• Record the serial number of your radar. You will need the serial number
when you order replacement parts.
Contacting Garmin Product Support
Replacement parts are available only through Garmin Product Support.
• For dealer specific support, call 1-866-418-9438
• Go to www.garmin.com/support
support information.
• In the USA, call (913) 397.8200 or (800) 800.1020.
• In the UK, call 0808 2380000.
• In Europe, call +44 (0) 870.8501241.
WARNING
 
NOTICE
www.garmin.com to download the
and click Contact Support for in-country

Table of Contents

Getting Started ������������������������������������������������������������������������������������
Tools Needed .....................................................................................................2
Radar Software Update .....................................................................................2
Radar Diagnostics Page ....................................................................................2
Troubleshooting ���������������������������������������������������������������������������������
Universal Troubleshooting Steps
Radar Satus LED ...............................................................................................3
Error Codes and Messages ...............................................................................3
1002 - Hardware FPGA Interface Fault
1003 - Hardware FPGA Program Fault
1004 - Input Voltage Low ...................................................................................3
1005 - Input Voltage High ..................................................................................3
1006 - Heater Voltage Low
1007 - Heater Voltage High
1009 - High Voltage High
1011 - Transmit Current High ............................................................................3
1013 - System Temperature High
1015 - Modulator Temperature High
1017 - Modulator Status Fault, Modulator is Not Responding
1026 - Modulator Power Fault, Could Not Power Up the Modulator
1018 - Heater Status Fault, Heater Current Low
1023 - AFC Calibrate Time Out, Did Not Complete AFC Calibration
1024 - AFC Calibrate Failed, Could Not Complete AFC System
1019 - Spin Up Time Out, Speed Did Not Reach Specified RPMs
1025 - Transmit Speed Lost, Could Not Maintain Rotation Speed
Failure With No Error Code ...............................................................................7
Major Component Locations �������������������������������������������������������������
Radar Disassembly ����������������������������������������������������������������������������
Removing the Dome ..........................................................................................9
Reinstalling the Dome .......................................................................................9
Removing the Antenna ......................................................................................9
Reinstalling the Antenna ....................................................................................9
Replacing the Magnetron ................................................................................10
Replacing the Motor ........................................................................................10
Replacing a PCB .............................................................................................11
Connector Locations ������������������������������������������������������������������������
Modulator PCB ................................................................................................13
Processor PCB ................................................................................................13
Antenna Position Sensor PCB .........................................................................13
Service Parts �������������������������������������������������������������������������������������
Dome and Antenna ..........................................................................................14
PCB-related Parts ............................................................................................15
Magnetron .......................................................................................................16
Cables .............................................................................................................16
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2
3
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8
9
13
14