Garmin GMR 420 xHD2 Series Field Service Manual

GMR 420/620/1220/2520 xHD2 Series
Field Service Manual
The GMR 420/620/1220/2520 xHD2 series 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. Before performing any bench test procedure,
remove the antenna and install the antenna terminator provided in the
Garmin Radar Service Kit (T10-00114-00). Failure to install the antenna
terminator will expose the service technician to harmful electromagnetic
radiation that can result in personal injury or death.
The GMR 420/620/1220/2520 xHD2 series 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.
DO NOT place the GMR 420/620/1220/2520 xHD2 series radar into a test
mode for display purposes. When the antenna is attached, there is a danger of
non-ionizing radiation. The test modes should only be used for troubleshooting
purposes with the antenna removed and the antenna terminator in place.
The GMR 420/620/1220/2520 xHD2 series 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.
WARNING
 
NOTICE

Table of Contents

Getting Started ....................................................................................
Radar Software Update .....................................................................................2
Radar Diagnostics Page ....................................................................................2
Tools Needed .....................................................................................................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 ...............................................................................6
Major Component Locations .............................................................
Radar Disassembly ............................................................................
Removing the Antenna ......................................................................................8
Installing the Antenna Terminator
Opening the Pedestal Housing ..........................................................................8
Removing the Electronics Box ...........................................................................9
Magnetron Considerations ................................................................................9
Removing the Antenna Position Sensor PCB
The Magnetron/LNC/Circulator Assembly
Removing the Motor Assembly ........................................................................11
Removing the Rotary Joint ..............................................................................11
Removing the Internal Power and Network Cables
Disassembling the Electronics Box
Service Parts .....................................................................................
Pedestal Housing ............................................................................................13
Magnetron, LNC, and Circulator
Motor Assembly ...............................................................................................14
Electronics .......................................................................................................14
Cables .............................................................................................................15
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