GARMIN 7400 Series Multifunction Displays Chartplotters

Specifications:

• Model : GPSMAP 7400/7600 Series
• Manufacturer : Garmin
• Screen Size : Varies (7-inch, 8-inch, 10-inch, 12-inch, 16-inch)
• Software Update Method: Memory Card
• Test Mode Screen : Available for Hardware Diagnostics

Product Usage Instructions

• Important Safety Information:
  Repair and maintenance of Garmin electronics can be complex and dangerous. Follow safety precautions to prevent personal injury or product damage.

• Disconnecting Power:
  Before opening the device for service, disconnect it from power to avoid high- voltage risks. Exercise caution around circuit boards inside the front housing when power is applied.

• Static Discharge Protection:
  Adhere to Garmin’s guidelines on static discharge protection and maintain a dust-free environment during repairs to prevent damage to the Chartplotter.

• Water-Resistance Maintenance:
  Ensure all gaskets are correctly reinstalled or replaced during repairs to maintain the water resistance of the chart plotter.

Tools Needed:

• 14 mm, 16 mm, 21 mm, and 29 mm sockets
• T6 bit (for ten-, twelve-, or sixteen-inch chart plotters)

• 1 Phillips bit (for seven- or eight-inch chart plotters)

Software Update:

1. Insert a memory card into the computer’s card slot.
2. Visit www.garmin.com/support/software/marine.html.
3. Select Download next to GPSMAP Series with SD Card.
4. Read and agree to the terms, then select Download.
5. Select Run and choose the memory card drive, then click Next > Finish.

Updating Device Software:
Prior to software update, obtain a software-update memory card or load the latest software onto a memory card. Turn on the chartplotter and wait for the home screen.

Test Mode Screen:
The Test Mode screen provides hardware diagnostics and software information. Use it to identify problems. Testing NMEA 2000 and Garmin Network functionality requires special cable or working Garmin Marine Network device.

Activating Test Mode:

1. Select Settings > System > System Information >Software Information.
2. Hold above the software version number until the screen changes.

Use this manual to identify and replace certain failed components of a GPSMAP 7400/7600 series chartplotter

WARNING

• Repairing and performing maintenance on Garmin electronics is complex work that can result in serious personal injury or product damage if not done correctly.
• Components on the circuit boards hold a high-voltage charge. To be safe, disconnect the device from power before opening it for service. If you have power applied to the device while it is open, use caution when working around the circuit boards located on the inside of the front housing.

NOTICE

• Follow the guidelines set forth by Garmin regarding static discharge protection and a dust-free repair environment to avoid damaging the chartplotter during repair.
• Verify all gaskets are reinstalled or replaced correctly when repairing the chart plotter to maintain water resistance.
• Garmin is not responsible for, and does not warrant, the work that you or a nonauthorized repair provider perform on your product.

Tools Needed

• A 1 GB or larger memory card (to update the chartplotter)
• A 10 to 35 Vdc 6 to 10 A power supply (for bench testing)

• 1 Phillips screwdriver (removing the case screws on a seven- or eightinch chartplotter.)

• 0 Phillips screwdriver (SD card socket)

• T6 screwdriver (removing the case screws on a ten-, twelve-, or sixteeninch chartplotter)
• 14 mm, 16 mm, 21 mm, and 29 mm wrenches or sockets (removing the nuts on each port)
• Torque wrench (pneumatic) with:
  • 14 mm, 16 mm, 21 mm, and 29 mm sockets (securing the nuts on each port)
  • T6 bit (securing the case screws on a ten-, twelve-, or sixteen-inch chartplotter)

  • 1 Phillips bit (securing the case screws on a seven- or eight-inch chartplotter)

• Replacement part kit (specified in the repair topic)
• Soldering iron and solder (patch antenna)
• Desoldering braid (patch antenna)
• Voltmeter
• GPSMAP 7400/7600 series NMEA 2000 cable (testing NMEA 2000 ports)
• Garmin Marine Network cable (testing Network ports)

Important Information Regarding the Field Repair of GPSMAP 7400/7600

Series Chartplotters

• This manual covers the repair of all GPSMAP 7400/7600 series chartplotters. In some procedures, the size of the chartplotter screen is used to differentiate the models:
  • Seven-inch chartplotters: GPSMAP 7407, 7407xsv, 7607, 7607xsv
  • Eight-inch chartplotters: GPSMAP 7408, 7408xsv, 7608, 7608xsv
  • Ten-inch chartplotters: GPSMAP 7410, 7410xsv, 7610, 7610xsv
  • Twelve-inch chartplotters: GPSMAP 7412, 7412xsv, 7612, 7612xsv
  • Sixteen-inch chartplotters: GPSMAP 7416, 7416xsv, 7616, 7616xsv
• Before performing any service to the chartplotter, ensure that the system software is up-to-date. If it is not, go to www.garmin.com to download the latest software version and use a 1 GB or larger SD card to update the chartplotter. Only proceed with the service if the software update does not resolve the issue.
• Record the serial number of your chartplotter. The serial number will be needed when you order replacement parts.
• Replacement parts are available through Garmin Product Support. Call 866-418-9438 to speak with a representative.
• Never use replacement parts from other chartplotters, even from the same model. Order all replacement parts from Garmin Product Support to ensure compatibility with your chartplotter.
• Although some replacement kits include cables, if the original cables are in good working condition, you should use them instead of the new ones supplied in the kit.
• Each time you remove copper tape from internal components, you must replace it. Copper tape is supplied with applicable parts kits.

Troubleshooting

Important Troubleshooting Information
If possible, you should perform troubleshooting procedures while on the boat to best determine the failed component. If the repair need is not readily apparent, such as a broken keypad or a broken power connector, you should boot the chartplotter in test mode to identify the failed components.

Before performing any service to the chartplotter, ensure the system software is up-to-date. If it is not, go to www.garmin.com to download the latest software version and use a 1 GB or larger memory card to update the chartplotter. You should perform the service only if the software update does not resolve the issue.

Loading the New Software on a Memory Card

1. Insert a memory card into the card slot on the computer.
2. Go to www.garmin.com/support/software/marine.html.
3. Select Download next to “GPSMAP Series with SD Card.”
4. Read and agree to the terms.
5. Select Download.
6. Select Run.
7. Select the drive associated with the memory card, and select Next > Finish.

Updating the Device Software
Before you can update the software, you must obtain a software-update memory card or load the latest software onto a memory card.

1. Turn on the chartplotter, and wait for the home screen to appear.
   NOTE: In order for the software update instructions to appear, the device must be fully booted before the card is inserted.

2. Open the memory card door.

3. Insert the memory card, and press it in until it clicks.

4. Close the door.

5. Follow the on-screen instructions.

6. Wait several minutes while the software update process completes. The device returns to normal operation after the software update process is complete.

7. Remove the memory card.

NOTE: If the memory card is removed before the device restarts fully, the software update is not complete.

About the Test Mode Screen

The Test Mode screen provides hardware diagnostics and software information. Use the test mode screen to identify problems. Any failed tests could be problematic, and should be examined further.

NOTE: Testing the NMEA 2000 and Garmin Network functionality requires either a special cable or a known working Garmin Marine Network device.

Activating Test Mode

1. Select Settings > System > System Information > Software Information.
2. Hold above the software version number ➊ until the screen changes.
3. Select Field Diagnostics > Test Mode.
4. Wait 2–3 minutes for the self-tests to complete.

To navigate the Test Mode Screen, select a board or a test from the options on the right side of the screen.

Testing

Testing the Display

Testing the Display Output
You can test the display or troubleshoot the video output by using the test mode.

1. Turn on the device in test mode, and wait 2–3 minutes for the self-tests to complete.
2. Select Color Pages. The screen will appear to be completely white.
3. Select Next or Previous to cycle through color pages.
4. Use the white, black, red, green, and blue screens to determine if the display or the video output is working correctly.
5. Select Main Page to exit the color page at any time.

Note : A screen failure requires the replacement of the front case assembly (page 14).

Testing the Touchscreen
If the touchscreen on a GPSMAP 7400/7600 series chartplotter does not correctly recognize touch input, you can test it by using the test mode.

1. Turn on the device in test mode, and wait 2–3 minutes for the self-tests to complete.
2. Select Touchscreen test. Red lines appear on the screen.
3. Swipe across each line and observe the behavior:
   • If each line changes from red to green when you swipe across it, then the touchscreen is calibrated correctly. You may have to swipe across the bars multiple times to get each bar to turn green.
   • If each line does not change from red to green, then the touchscreen is not calibrated correctly. Follow the procedures in the “Calibrating the Touchscreen” topic (page 3) to calibrate the touch screen.
4. Press the Power key to exit the touchscreen test at any time.

Calibrating the Touchscreen
If the touchscreen test (page 3) indicates that the touchscreen is not calibrated correctly, use the test mode to calibrate the touchscreen.

1. Turn on the device in test mode, and wait 2–3 minutes for the self-tests to complete.

2. Select Display Page > Touch Cal.
   NOTE: When you are in test mode, you can also start touchscreen calibration by holding the power button and releasing after 5 seconds.

3. Follow the on-screen instructions to calibrate the touchscreen.

4. Test the touchscreen to determine the result of the calibration.

5. Repeat steps 1–4 if necessary.

NOTE: A touchscreen failure requires replacement of the front case assembly (page 14).

Testing GPS

1. Take the device outdoors to a location with a clear view of the sky, avoiding heavy tree cover and buildings.
2. Boot the device to Normal mode.
3. Select Settings > System > GPS.
4. Wait up to three minutes for the device to acquire satellites.

If the device does not acquire a satellite fix, there is a problem with the main board or with the internal antenna if it is separate from the main board on your model.

Testing the Power Button Board

1. Boot the device in normal mode.
2. Enable wireless networking and connect the device to a smartphone or tablet.
3. Activate test mode (page 2).
4. On the main page, observe the Push Button field. Confirm the field says UP when the power button is not pressed and DOWN when it is pressed.
5. Select the Display Page button and confirm you can hear the beeper.
6. On the Display page, observe the Light Sensor mV. Confirm the voltage is less than 500 mV while covering the sensor with a thumb and greater than 3000 mV while in full sunlight.

If a failure is detected during any step while testing the power button board, then replace the power button board.

Locating Problems
Use the following table to locate the source of problems with specific systems.

7 in.

8 in.

| Main Board 012-02579-xx| System Power Display Backlight GPS

Wifi / BlueTooth

Video Ethernet NMEA 2000

7 in.

8 in.

| Connector Board 012-02580-xx| Sonar NMEA 2000

NMEA 0183

Connectors

10 in.

12 in.

16 in.

| Main Board 012-02581-xx| System Power Display Backlight GPS

Video Ethernet NMEA 2000

NMEA 0183

Connectors

10 in.

12 in.

16 in.

| Power Button Board 012-02438-xx| Wifi / Bluetooth Power Key Beeper Photocell

Testing NMEA 0183
If you are experiencing problems with NMEA 0183 data transmission, you will need to create and connect a custom power cable before you can identify NMEA 0183 problems on the Test Mode screen.

1. Create a test power cable (see below).
2. Connect the test power cable to POWER on the back of the chartplotter.
3. Turn on the chartplotter in test mode, and wait 2–3 minutes for the selftests to complete.
4. On the test page, examine the results on the Extern UART lpbk fields for Port 1 and Port 2.
   • If the fields read “Pass”, then no problems were detected.
   • If either field reads “Fail”, then there is a problem with NMEA 0183. See

Locating Problems for more information (page 4).

Creating a Test Power Cable

1. Connect NMEA 1 RXD (Brown) to NMEA 1 TXD (Blue).
2. Connect NMEA 2 RXD (Violet) to NMEA 2 TXD (Gray).

Disassembly and Reassembly Procedures

NOTICE
Observe the cable connections during all parts of the following repair procedures. If at any point during this procedure, you notice a cable is disconnected, connect the cable and repeat any applicable test procedures.

Opening the Housing
NOTICE
Before opening the housing, ensure you have static discharge equipment in place. Before you can access the main CPU board, you must first open the rear housing.

Separating the Rear Housing from the Front Housing: 7 in. and 8 in. Models

1. With the chartplotter face down, remove the large nuts, washers, and weathercaps from the ports, using the appropriate socket for each nut.
   Screw or Nut| Socket or Bit Size| Torque Measurment
   ---|---|---
   Garmin Marine Network port| 29 mm socket| 15 kgf/cm
   Power/data and transducer ports| 21 mm socket| 11 kgf/cm
   NMEA 2000 port| 16 mm socket| 7 kgf/cm
   BNC port| 14 mm socket| 11 kgf/cm

2. Remove the screws ➊ that fasten the rear housing to the front housing.

3. Press down on the connectors and lift the rear housing straight up ➋ to separate it from the front housing, and tip up the rear housing ➌ to expose the components without placing stress on the internal cables. NOTE: Step 4 and step 5 apply to 8 in. models only. Antennas on 7 in. models are integrated with the main board.

4. Remove the screw ➍ securing the antenna patch assembly ➎ to the rear case housing.

5. Slide the antenna patch assembly out of the rear case assembly. The back of the housing is now separate from the front of the housing.

Separating the Rear Housing from the Front Housing: 10 in. and 12 in. Models

1. With the chartplotter face down, remove the large nuts, washers, and weathercaps from the ports, using the appropriate socket for each nut.
   Screw or Nut| Socket or Bit Size| Torque Measurment
   ---|---|---
   Garmin Marine Network port| 29 mm socket| 15 kgf/cm
   Power/data and transducer ports| 21 mm socket| 11 kgf/cm
   NMEA 2000 port| 16 mm socket| 7 kgf/cm
   BNC port| 14 mm socket| 11 kgf/cm

2. Remove the T6 screws ➊ that fasten the rear housing to the front housing.

3. Press down on the connectors and lift the rear housing straight up to separate it from the front housing, and tip up the rear housing to expose the components without placing stress on the internal cables.

4. Remove the screw ➋ securing the antenna patch assembly ➌ to the rear case housing.

5. Slide the antenna patch assembly out of the rear case assembly. The back of the housing is now separate from the front of the housing.

Separating the Rear Housing from the Front Housing: 16 in. Models

1. With the chartplotter face down, remove the large nuts, washers, and weathercaps from the ports, using the appropriate socket for each nut.
   Screw or Nut| Socket or Bit Size| Torque Measurment
   ---|---|---
   Garmin Marine Network port| 29 mm socket| 15 kgf/cm
   Power/data and transducer ports| 21 mm socket| 11 kgf/cm
   NMEA 2000 port| 16 mm socket| 7 kgf/cm
   BNC port| 14 mm socket| 11 kgf/cm

2. Remove the T6 screws ➊ that fasten the rear housing to the front housing.

3. Slowly separate the two housings and disconnect the cable ➋ that is connected to the button board.

4. Disconnect all remaining cables on the bottom of the main board ➌.

Removing the Connector Board: 7 in. and 8 in. Models
NOTICE
The main board on 7 in. models is not secured to the front case assembly. Use caution when separating the boards to prevent damage.

1. Disconnect the cable ➊ from the lower-left corner of the main board.
2. Remove the plastic pan head Phillips screw ➋ from the center of the connector board.
3. Apply pressure to the main board and lift the connector board straight up, being careful not to bend the connector pins between the boards.

Removing the Main Board: 7 in. and 8 in. Models

1. Disconnect the SD port cable ➊ from the main board.
2. Disconnect the 4-pin cable ➋ from the main board.
3. Remove the five screws ➌ securing the main board to the screen assembly (8 in. models only).
4. Slowly lift the main board straight up and tilt it toward you to reveal the cables ➎ beneath the board.
5. Disconnect the cables. The main board is now separate from the display assembly.

Removing the Main Board: 10 in. and 12 in. Models

1. Separate the housings (page 7).
2. Disconnect the cables ➊ connected to the top of the main board.
3. Slowly lift the main board straight up and tilt it to reveal the cables beneath the board.
4. Disconnect the cables connected to the bottom of the main board.

The main board is now separate from the display assembly.

Removing the Main Board: 16 in. Models

1. Open the housing (page 7).
2. Remove the screws securing the patch antenna ➊ to the rear case and slide the patch antenna out of the housing.
3. Remove the three screws ➋ securing the main board to the rear case.
4. Disconnect all cables connected to the main board.

Reassembling the Housing

NOTICE
After you have replaced a component or completed a repair, it is vital that you correctly reassemble the unit housing to ensure IEC 60529 IPX7 water resistance.

Kits required (if damaged or distorted):

1. Ensure that all replaced or repaired components are properly installed, and that all of the internal cables are connected.
2. Examine the large gasket along the rim of the device.
   • Replace the gasket if it is damaged or distorted.
   • Ensure that the gasket channel and the gasket are free of dust and debris.
   • The gasket will only fit one way, and will loosely fit into the channel along the edge of the housing when installed correctly.
3. Examine the O-rings around each of the connectors.
   • Replace any O-rings that appear damaged or distorted.
   • Ensure O-ring channels and gaskets are free of dust and debris.
4. Ensure the large gasket is in place and the cables are not pinched by the lid.
   • The lid will fit snugly on the main housing. You should not force the lid closed.
5. Using a torque wrench with the appropriate socket or bit, tighten the case screws and the nuts around each connector according to the values in the table

Repair Procedures

Replacing the SD Card Door
Kits required:

1. If the original SD card door is still connected to the chartplotter, open the door and twist it clockwise to remove it.
2. Place the bottom pin of the new door at the bottom of the SD card-door opening.
3. Twist the door counter-clockwise to snap it into place.

Replacing Weather Caps
If the weather caps are worn or damaged, you can replace them.

Kit required:

1. Remove the hex nut, spacer, and all remaining pieces of the original weathercap.
2. Replace the weathercap, spacer, and hex nut.
3. Using a torque wrench with the appropriate socket, tighten the nut around the connector according to the values in the table

Replacing the Rear Housing
Each model of the 7400/7600 series chartplotters has a single replaceable rear housing.

Kit required:

1. Open the housing (page 5).
2. Install the replacement rear housing.
3. Reassemble the housing (page 12).

Replacing the Front Case Assembly: 7 in. and 8 in. Models
Each model of the 7400/7600 series chartplotters has a single replaceable front case assembly. The front case assembly includes the screen

NOTE: You cannot replace the front case assembly on 16-inch chartplotters. You must send the device to Garmin for repair.

Kits required:

1. Open the housing (page 5).
2. Remove the connector board (7 in. and 8 in. chartplotters) (page 9).
3. Remove the main board (page 10).
4. Remove the SD card port (8 in. chartplotters) (page 16).
5. On the replacement front case, install the SD card port you removed in step 4.
6. On the replacement front case, install the main board you removed in step 3.
7. On the replacement front case, install the connector board you removed in step 2.
8. Reassemble the housing (page 12).

Replacing the Front Case Assembly: 10 in. and 12 in. Models
Each model of the 7400/7600 series chartplotters has a single replaceable front case assembly. The front case assembly includes the screen

NOTE : You cannot replace the front case assembly on 16 in. chartplotters. You must send the device to Garmin for repair.

Kits required:

1. Open the housing (page 7).
2. Remove the main board (page 11).
3. Remove the SD card port (page 16).
4. On the replacement front case assembly, install the SD card port using the components removed in step 3.
5. On the replacement front case assembly, install the main board using the components removed in step 2.
6. Reassemble the housing (page 12).

Replacing the Connector Board: 7 in. and 8 in. Models
If the connector board becomes damaged or broken, you can replace the connector board on 7 inch and 8 inch chart plotters.

Kits required:

Board
7607xsv, 7407xsv, 7408xsv, 7608xsv| S00-00533-28| 7x07xsv/7x08xsv Connector Board
7x07xsv, 7x08xsv with J1939| S00-00533-52| 7x07xsv/7x08xsv J1939 Connector Board

1. Open the housing (page 5).
2. Remove the connector board (page 9).
3. Install the replacement connector board.
4. Using a #1 Phillips screwdriver, secure the board using the plastic pan head screw included with the service kit.
5. Reassemble the housing (page 12).

Replacing the Main Board: 7 in. and 8 in. Models

Kits required:

1. Open the housing (page 5).
2. Remove the connector board (page 9).
3. Remove the main board (page 10).
4. Solder a new patch antenna (page 17) to the same place on the replacement board (8 in. models only).
5. Reassemble the housing (page 12).

Replacing the Main Board: 10 in., 12 in., and 16 in. Models
Kits required:

1. Open the housing (page 7).
2. Remove the main board (page 11).
3. Desolder the patch antenna from the main board that is being replaced.
4. Solder the patch antenna (removed in step 3) to the replacement board.
5. Secure the replacement board to the rear case using the screws removed in step 2.
6. Reassemble the housing (page 12).

Replacing the SD Card Port
NOTICE
SD card ports on 7 in. chartplotters are integrated with the front case assembly. You must replace the front case to replace the SD card port on these models.

Kits required:

1. Open the housing (page 5). The SD card port is located on the front of the housing.
2. Disconnect the cable that connects the SD card port to the main board.
3. Using a #0 Phillips screwdriver, remove the screws that fasten the SD card port to the front housing, and remove the SD card port from the front housing.
4. Ensure the rectangular gasket is in place, clean, and free of debris. The gasket is important because it keeps water from entering around the SD card port.
5. Fasten the replacement SD card port to the front housing using the screws you removed in step 3.
6. Reconnect the cable you removed in step 2. Though the replacement SD card port came with a new cable, if the original cable is not damaged, you should reuse the original cable.
7. Reassemble the housing (page 12).

Replacing the Power Button Board: 10 in., 12 in., and 16 in. Models

NOTE : Chartplotters smaller than 10 in. do not contain a power button board.

Kit required:

Power Button Board

1. Separate the front and rear housings (page 7).
2. Disconnect the cable connecting the main board to the power button board.
3. Remove the two screws securing the power button board to the front case assembly.
4. Replace the power button board and connect the cable to the main board.
5. Reassemble the housing (page 12).

Replacing the Patch Antenna: 8 in., 10 in., and 12 in. Models
Kit required:

7408/7408xsv/7608/7608xsv

7410, 7410xsv, 7610, 7610xsv,

7412, 7412xsv, 7612, 7612xsv

| S00-00533-18| 74xx/76xx Patch Antenna

1. Open the housing (page 5).
2. Remove the connector board (8 in. chartplotters only) (page 9).
3. Desolder the joint connecting the patch antenna to the main board.
4. Solder the replacement patch antenna to the main board.
5. Install the connector board you removed in step 2 (8 in. chartplotters only).
6. Reassemble the housing (page 12).

Replacing the Patch Antenna: 16 in. Models
Kits required:

1. Open the housing (page 7).
2. Remove the screws securing the patch antenna to the rear housing.
3. Remove the main board from the rear housing.
4. Desolder the joint connecting the patch antenna to the main board.
5. Solder the replacement patch antenna to the main board.
6. Install the connector board you removed in step 3.
7. Secure the patch antenna using the screws you removed in step 2.
8. Reassemble the housing (page 12).

© 2015-2024 Garmin Ltd. or its subsidiaries

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Garmin®, the Garmin logo, and GPSMAP® are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. These trademarks may not be used without the express permission of Garmin.

For the latest free software updates (excluding map data) throughout the life of your Garmin products, go to www.garmin.com.

© 2015-2024 Garmin Ltd. or its subsidiaries

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www.garmin.com

FAQ

Q: Is it safe to repair the chartplotter without disconnecting power?
A: No, always disconnect power before servicing to avoid high-voltage risks.

Q: What should I do if I encounter problems during a software update?
A: Ensure the memory card is inserted correctly and follow the software update instructions carefully.

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