Garmin GNS 480 Maintenance Manual
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Garmin GNS 480 Maintenance Manual

Garmin GNS 480 Maintenance Manual

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GNS 480 (CNX80)
Maintenance Manual
July 2005
560-7027-00D

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  • Page 1 GNS 480 (CNX80) Maintenance Manual July 2005 560-7027-00D...
  • Page 2 This document and the information disclosed herein are proprietary data of Garmin AT, Inc. Neither this document or the information contained herein shall be used, reproduced, or disclosed to others without the written authorization of Garmin AT, Inc., except to the extent required for installation or maintenance of the recipient’s equipment.
  • Page 3 Date Description April 11, 2003 Initial release. September 19, 2003 Changed UPSAT logo and references to UPSAT to Garmin. Incor- porated temporary revisions: 561-7027-0001, -0002, and -0003. November 17, 2004 Changed references of CNX80 to GNS 480. June 17, 2005 Added part numbers (2A, 22A, and 43A) to parts list.
  • Page 4 May 31, 2003 September 19, 2003 Rev 00A 561-7002 June 30, 2003 Incorporated with June 30, 2003 September 19, 2003 Rev 00A 561-7003 July 17, 2003 Incorporated with July 17, 2003 September 19, 2003 Rev 00A 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 5 ERVICE ULLETIN Part No. 430-6100-800-xxx Service Bul- Identified Date Inserted Description letin VISIT DEALERS ONLY SECTION AT HTTP://WWW.GARMIN.COM FOR UP TO DATE ISSUED SERVICE BULLETINS GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 6 IST OF FFECTIVE AGES Page Page Page Page Page 3-10 1-10 1-11 1-12 7-10 2-10 2-11 2-12 2-13 2-14 2-15 2-16 2-17 2-18 2-19 2-20 2-21 2-22 2-23 2-24 2-25 2-26 2-27 2-28 2-29 2-30 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 7: Table Of Contents

    VERVIEW 4.1.1 ..........................4-1 ENERAL 4.1.2 ....................4-1 QUIPMENT AND ATERIALS ........................... 4-1 ROCEDURE 4.2.1 ........................4-1 XTERNAL ARTS Check..............................5-1 ............................5-1 VERVIEW 5.1.1 ..........................5-1 ENERAL 5.1.2 ....................5-1 QUIPMENT AND ATERIALS GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 8 CREEN TO ERIFY REQUENCY 2-6. S ..................2-29 IGURE AMPLE PPLICATION PDATE 2-7. S ......................2-29 IGURE YSTEM CREEN 2-8. GNS 480 WAAS E ................2-29 IGURE NGINE PDATE 3-1. L ..................3-3 IGURE EFT AND IGHT LEEVE SSEMBLY 3-2. I/O B ................3-6 IGURE...

  • Page 9: General Information

    This document is being furnished in confidence by Garmin AT, Inc. The information disclosed herein falls within exemption (b)(4) of 5 USC 552 and the prohibitions of 18 USC 1905. (c)2005 by Garmin AT, Inc. All rights reserved. Printed in the USA.

  • Page 10: Content Data

    It is recommended that the tests in Section 2.1, Return to Service Procedures be done before the unit is disassembled. These tests can tell the condition of the GNS 480 or most probable cause of any malfunc- tion. Should any malfunction occur, repair as necessary.
  • Page 11 VOR, operating in the range of 108.100 MHz to 111.900 MHz. There are 40 chan- nels spaced on the ODD hundred kilohertz channels. Low Pass Filter Level Memory Megahertz (millions of cycles per second) Microphone Monitor Message GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 12 RF signals with an internal local oscillator to map them to an intermediate frequency. This creates a composite signal that can be processed by a DSP. Voice Operated Relay VSWR Voltage Standing Wave Ratio Watts 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 13: Description And Operation

    ESCRIPTION PERATION The GNS 480 Color GPS/Nav/Comm is a panel-mounted product that contains a GPS/WAAS en- gine, VHF Comm, and VHF Nav in an integrated unit with a moving map and color display. The GNS 480 will also control a remote transponder.

  • Page 14: System Interfaces

    General Information 1.2.1 System Interfaces Figure 1-2. Sample GNS 480 System Diagram 1.3 S PECIFICATIONS This section includes detailed electrical, physical, environmental and performance specifications for the GNS 480. 1.3.1 Electrical Input voltage: 11 VDC to 30 VDC Input current: 14 V........130 mA typical...

  • Page 15: Environmental

    General Information Table 1-1 lists the major subassemblies of the GNS 480 with the subassembly part numbers and refer- ence designator. Table 1-1. Major Subassemblies Description Part Number Reference Designator GPS/WAAS Engine 415-1039-xx I/O Board 415-6036-xx Vertical Card 415-6037-xx Display Extender Board...

  • Page 16: Theory Of Operation

    PERATION 1.5.1 General Description The GNS 480 is a GPS/NAV/COMM unit with a sunlight readable 256 color AMLCD display with ¼ VGA resolution driven by a Pentium processor with MMX technology. The unit includes a WAAS-GPS engine, a VHF navigation receiver capable of VOR/ LOC/GS navigation, and a VHF communications transceiver with 760 channels with 8 watts transmission power.

  • Page 17: Circuit Operation

    Head Assembly must be replaced as an assembly. The GNS 480 Display Interface board contains the hardware and software that controls the GNS 480 head unit. It is self-contained and can run independently of the Pentium board. The Display Interface board has a 3x15 pin interface connector which mates with the Pentium board when the head unit is mounted to the main unit.

  • Page 18: Figure 1-5. Display Interface Board Block Diagram

    Figure 1-5. Display Interface Board Block Diagram The GNS 480 Keypad board contains the push buttons, keypad backlight, ambient light photocell and the IR receiver and transmitter. The keys are lit from amber LEDs through laser etching in the rubber keypad.
  • Page 19 WAAS symbols to extract WAAS data bits • a digital section, consisting primarily of a microprocessor with its supporting circuitry including RAM, EEPROM, and Real Time Clock (RTC) • power circuitry GNS 480 (CNX80) Maintenance Manual 560-7027-00D 1-11...
  • Page 20 In utilizing the current Pentium main board, no provision exists to support additional current loading on the power supply beyond that of a single I/O board. The current production board as used in the SL30 VHF NAV/COMM may be used in the GNS 480 as is with no changes. 1-12...

  • Page 21: Testing

    The service technician is responsible for checking all service bulletins issued against the unit model being serviced. Refer to Service Bulletin List at the start of this manual and the Garmin AT web site. Software verification is not required because the software was tested during development. However, you must verify that the proper version of software is installed.

  • Page 22: Test Setup

    The navigation output is checked by the Manual VOR output (Radial Displayed) and the deviation needle indications on an actual Indicator or by means of a DVM. The stan- dard test signals are as follows, unless otherwise specified in the defined test. 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 23: Table 2-3. Nav

    15 kHz LPF Filter 2 15 kHz LPF De-EMPHASIS 4 Ω Pk ± 2 Ext Load R Detector AC Level Watts AF GEN1 Freq. 1 kHz AF GEN LVL 100 mV TX Freq Error GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 24 Follow ESD precautions at all times when handling components or circuit boards. When working on the unit, you must use a grounded wrist strap and a grounded working surface. Circuit boards or components must only be carried in a nonconductive, anti-static bag. Reference EIA Standard # EIA-625. 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 25: Equivalent

    Testing IO Expansion J5 Live Air Signal RS232 TxD5 GPS-A33 antenna or Main System J1 Collins 479S6 or RS232 RxD5 GPS/WAAS ANT equivalent J7 pin 1 RS232 RXD7 IFR NAV 750 Test POWER + OUT (NAV) RS232 RxD6 J7 pin 2 +Av Pwr RS232 TxD6 POWER GND OUT (NAV)
  • Page 26 Testing This Page Intentionally Left Blank 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 27 GNS 480 Service Data Sheet PRELIMINARY INSPECTION P/N___________________________ MODs__________________ RMA________________________ Tech_________________ Date ______________ SN__________ Model_____________________ VISUAL DAMAGE: ____NONE _____Hardware Damage _____Other Visual Damage Details: HIDDEN DAMAGE: ____NONE _____Minor Damage _____Major Damage Hidden Damage Details: NORMAL MODE Record Self-Test Failures:_______________________________________________________________ _______Downloaded configuration settings with PC (If applicable, else record below)
  • Page 28 GNS 480 Service Data Sheet FINAL ACCEPTANCE TEST Tech_______________________ Date______________________ Service manual return to service procedures completed Reloaded configuration using PC (if applicable) Complete below checklist if using non-automated return to service setup or Field Service Manual. Pass/ Pass/ Test No. 1.0 Final Unit Checkout Test No.

  • Page 29: Test Procedures

    ENTER in sequence). The CNX will reboot into GND MAINT mode. Procedure 3. Enter the GNS 480 CHECKOUT mode. (Press the TEST key. Press the #4 Function key followed by INFO, then the #4 Function key again). 4. Press the A to D key.
  • Page 30 Procedure ENTER in sequence). The CNX will reboot into GND MAINT mode. 3. Enter the GNS 480 CHECKOUT mode. (Press the TEST key. Press the #4 Function key followed by INFO, then the #4 Function key again). Verify a 1 KHz signal, 17 Vp-p, +/- 3 V, (approx. 6.2 V ).
  • Page 31 GSI Superflag, AV_PWR minus 2 volts is the minimum voltage for a valid signal, source capability of 400 mA. This voltage is a single- ended measurement. • LOCALIZER enable, Open collector outputs capable of sinking up to 400 mA. GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-11...
  • Page 32 Each output should activate the appropriate deflection on standard equip- ment or: Limits VDI U/D Deviation, +/-150 mV full scale deflection will drive up to 200 ohm load. This voltage is a differential measurement made between VDI+ Right and VDI+ Left. 2-12 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 33 1. Power on the UUT in the Ground Maintenance mode. Procedure 2. Press the INPUT key. 3. Read the Synchro HDG readout. Limits Verify the Synchro readout is 149 degrees, + 3 degrees. GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-13...
  • Page 34 Mic #1 audio, J4 pin 8. Procedure 2. Key the Comm transmitter, (PTT). 3. Measure the AM modulation on the transmitter’s carrier signal. 118.00MHz _______ NLT 85% 127.5MHz ______ NLT 85% Limits 136.97MHz ______ NLT 85% 2-14 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 35 4. Measure the power level of the 3rd harmonic (382 MHz). 5. Measure the power level of all harmonics up to the 10th harmonic. Limits Harmonic Energy: ______ down at least 65 dBc GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-15...
  • Page 36 2. Increase the signal generator signal level until the squelch opens. Squelch sensitivity: 118.000 MHz __________ NLT 1.78 µV (-101 dBm) Limits 127.500 MHz __________ NLT 1.78 µV (-101 dBm) 136.975 MHz __________ NLT 1.78 µV (-101 dBm) 2-16 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 37 6 dB with respect to the power at 1 kHz. Audio response: 350 Hz = ___ NMT 6 dB 1KHz = ___ 0 dB Limits 2.5 kHz = ___ NMT 3 dB 400 Hz = NMT 3 dB GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-17...
  • Page 38 6 dB at 350 Hz with respect to 1 kHz. Audio response: 350 Hz = ___ NMT 6 dB 1KHz = ___ 0 dB Limits 2.5 kHz = ___ NMT 5 dB 400 Hz = ____ NMT 5 dB 2-18 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 39 8. Increase the signal generator RF level +107 dB from the level neces- sary to obtain 6 dB SINAD. 9. Measure audio distortion; it should not exceed 5%. Limits Dynamic range _____ NMT 10%. GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-19...
  • Page 40 Limits • Scan time _____ OK (20 mS blank time between the 1 kHz tone) • Speaker audio _____ OFF, with MON function active. • Headset audio _____ Pulsing 1 kHz tone present 2-20 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 41 Verify the To/From flag is active on the King Indicator. –110 dBm minimum signal at 108.00 MHz / 117.950 MHz. Limits • Or verify the DVM reads 0.500 V , (AC), + .010 V GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-21...
  • Page 42 111.95 MHz (330.95 MHz). 4. Verify the GS indicator flag is pulled from view or the Main VDI + Valid signal is +300 mv. Limits Verify –95 dBm typical, -90 dBm minimum. 2-22 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 43 Non-manual VOR course deviation display is within +/- 2° (displayed radial) • Bearings up to +/- 80° from the selected radial, (the ambiguity indica- tion), shall be a clear To or From indication. GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-23...
  • Page 44 Limits reference unit. (The specification allows for a ± 5% tolerance margin between a normalized reference unit and the unit under test). • Verify the displayed UTC time is accurate. 2-24 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 45: Troubleshooting Info

    Check the TxKey input, J3 pin 4, pulled low being pulled low. for transmit. Message appears: Warning Transmitter has been active Stop transmitting and press CLR to reset. Stuck Microphone for too long and has timed out. GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-25...

  • Page 46: Calibration Procedures

    The following equipment will be necessary to check the oscillator frequency: DC Power Supply (13.8V) Test Cable, Power (15-pin, D-sub, Female) SL30/40/60 Display Head (Contact Garmin AT Customer Service) Rf Attenuator (30-40 dB, 25W) CAUTION: BE SURE THAT THE Rf ATTENUATOR IS OF PROPER RANGE. SERIOUS DAMAGE TO THE FREQUENCY COUNTER MAY OCCUR.

  • Page 47: Figure 2-3. Display Assembly Connection To J603 On Comm Board

    4. Apply ground to the “TEST” loop on the PCA. See Figure 2-4. Turn on the power switch on the dis- play head. 5. The display should read “TEST MODE”. J603 Display Connection P400 Power Supply Connection J300 CNX80 COMM BOARD Frequency 415-7002-50 Counter Connection Test Loop Point Figure 2-4. Comm Board Connections GNS 480 (CNX80) Maintenance Manual 560-7027-00D 2-27...

  • Page 48: Operating System Update

    4. Press the MENU/ENTER and the screen will display a scrolling list of tasks being accomplished. This will take about 1 minute. NOTE: If the GNS 480 power is cycled during this procedure, the software updating procedure will have to be restarted.

  • Page 49: Gps/Waas Engine

    Actual card may vary. RTCA/DO178B Level B © 2004 Garmin AT, Inc. All Rights Reserved Figure 2-8. GNS 480 WAAS Engine Update Card 2.5 GPS/WAAS E NGINE OFTWARE PDATE The following provides the steps necessary to update the operating software of the GPS/WAAS Engine.
  • Page 50 4. Press the MENU/ENTER and the screen will display a scrolling list of tasks being accomplished. The display will notify when complete. This takes approximately 7 minutes. NOTE: If the GNS 480 power is cycled during this procedure, the software updating procedure will have to be restarted.

  • Page 51: Disassembly/Assembly

    Before disassembly, use Return To Service Procedure to examine the condition of the GNS 480 or to find the most probable cause of its malfunction. Do this to prevent disassembly that is not necessary. Do only those procedures of disassembly that are necessary to remove defective parts and to correct malfunc- tions.
  • Page 52 8. Insert three screws (10) into underside of right sleeve (21). Torque all above screws to 7-9 lb-in. 9. Insert four screws (11) to secure sleeves to display head assembly (32). Torque screws (11) to 7-9 lb-in. 10. Affix warranty label as instructed in Figure 7-1, Sheet 5. 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 53: Display Head Assembly

    2. Gently and firmly push display head assembly (32) until properly seated. If looked from the top of the unit, no gold pins should be visible. Verify that all rows of pins were correctly inserted. 3. Insert left (20) and right (21) sleeves as instructed in paragraph 3.2.1.2. GNS 480 (CNX80) Maintenance Manual 560-7027-00D...

  • Page 54: Rear Panel Assembly

    4. Remove cable (35) from P201. 5. Remove cable (34) from P203. 6. Remove three screws (5) from NAV board (28). The longest shield on NAV board (28) must be re- moved to access third screw. 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 55: Comm Board

    1. Align GPS/WAAS Engine (24) over connector J11 and standoffs on I/O board. Push gently but firmly until properly seated in receptacle. 2. Insert four screws (5) and tighten. Torque screws (5) to 7-9 lb-in. GNS 480 (CNX80) Maintenance Manual 560-7027-00D...

  • Page 56: I/O Board

    TO PINS CAN OCCUR. 2. Secure I/O board (25) with seven screws (5) and one screw (6). Apply threadlocker (8) to screw (6). Torque screws (5) to 7-9 lb-in. Torque screw (6) to 2.5 lb-in. 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 57: Pentium Pca

    18. Gently lift up to remove vertical card ejector PCA (26) from J5. Once separated from J5, move the PCA forward to clear chassis. 19. Remove three screws (5) from Pentium PCA (29). Gently lift and remove. GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 58 ‘dimples’ on the shield ends are visible. 26. Place COMM PCA (30) over screw holes and temporarily hold with a hand tightened standoff. 27. Secure COMM PCA (30) D-sub to rear panel with two screws (10). 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 59: Battery Replacement

    6. Connect battery connector J12 to receptacle on Pentium PCA. Be sure that Pin 1 of connector is con- nected to Pin 1 on PCA. 7. Secure battery bracket (22A, Sheet 2) with two screws (9, Sheet 2). Torque screws (9) to 7-9 lb-in. GNS 480 (CNX80) Maintenance Manual 560-7027-00D...

  • Page 60: Compact Flash Ejector Mechanism Replacement

    1. Clean area prior to affixing label (38) with 99% Isopropyl alcohol and dry with lint free cloth. See Fig- ure 7-1, Sheet 5. 2. Properly mark the warranty warning label (38) with your repair station number. Apply the label across the seam as illustrated in figure. 3-10 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 61: Cleaning

    4.2.1 External Parts Remove dirt and dust with a soft lint-free cloth or a soft, natural-bristle brush. Remove oil and grease that has collected on the GNS 480 with a clean cloth. CAUTION: DO NOT USE TOO MUCH PRESSURE WHEN YOU CLEAN THE DISPLAY GLASS.
  • Page 62 Cleaning This Page Intentionally Left Blank 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 63: Check

    Installation of the cover must not compress the wires or cause a blockage in the movement of a part. Examine the exterior and interior of the GNS 480. The GNS 480 must be clean and have no dirt, loose particles, and other unwanted materials. Painted surfaces should not have bad scratches.
  • Page 64 Check This Page Intentionally Left Blank 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 65: Fits And Clearances

    Standoff, M-F,3/16 Hex, 4-40X1/2, Stainless Steel 7-9 lb-in 252-0420 Standoff, M-F,3/16 Hex, 4-40X9/16, Stainless Steel 7-9 lb-in 221-0408 Screw, Phillips, 4-40 x ½”, Stainless Steel 2.5 lb-in 221-0418 Screw, Phillips, 4-40 x 1”, Stainless Steel 2.5 lb-in GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 66 Fits and Clearances This Page Intentionally Left Blank 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 67: Illustrated Parts List

    Illustrated Parts List LLUSTRATED ARTS 7.1 I NTRODUCTION The Illustrated Parts List identifies the parts used to repair the GNS 480. 7.2 C ONTENTS OF LLUSTRATED ARTS 7.2.1 Parts List Each parts list refers to a figure number. The position number in the parts list refers to the bullet number on the corresponding figure number.

  • Page 68: Cage Code

    Illustrated Parts List Table 7-1. CAGE Code Manufacture List CODE Manufacturer 06915 RICHO Plastic Co 5825 N Tripp Ave Chicago, IL 60646-6013 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

  • Page 69: Assembly Drawings

    PENTIUM, TX CHIP. USE SUFFICIENT AMOUNT OF THERMAL GREASE TO FILL GAP BETWEEN CHIPS THERMAL GREASE TO FILL GAP BETWEEN CHIPS AND HEATSINK. AND HEATSINK. ESDS Figure 7-1. GNS 480 430-6100-800 (Sheet 1 of 5) GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 70 BATTERY 148-0053-00 SEE SECTION 3.2.10.3 SEE SECTION 3.2.10.3 REAR PANEL REAR PANEL 310-3069-01 310-3069-01 REAR PANEL REAR PANEL (23A) (23A) 310-3069-02 310-3069-02 (23B) (23B) Figure 7-1: GNS 480 P/N 430-6100-800 (Sheet 2 of 5) 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 71 Illustrated Parts List THREAD LOCKER NOT THREAD LOCKER NOT REQUIRED WHEN USING REQUIRED WHEN USING ITEM 12A ITEM 12A ESDS Figure 7-1: GNS 480 P/N 430-6100-800 (Sheet 3 of 5) GNS 480 (CNX80) Maintenance Manual 560-7027-00D...
  • Page 72 ATTACH EJECTOR ATTACH EJECTOR MECHANISM (ITEM 3) MECHANISM (ITEM 3) AFTER REAR PANEL AFTER REAR PANEL (ITEM 23) IS ATTACHED. (ITEM 23) IS ATTACHED. ESDS Figure 7-1: GNS 480 P/N 430-6100-800 (Sheet 4 of 5) 560-7027-00D GNS 480 (CNX80) Maintenance Manual...
  • Page 73 Illustrated Parts List Figure 7-1: GNS 480 P/N 430-6100-800 (Sheet 5 of 5) GNS 480 (CNX80) Maintenance Manual 560-7027-00D...

  • Page 74: Parts

    PCA, Display Extender GNS 480 (ESDS) 415-6040-00 PCA, GNS 480 NAV BOARD (ESDS) 415-6041-02 PCA, Pentium Board - GNS 480 W/O MODS (ESDS) -29A 415-6041-22 PCA, Pentium Board - GNS 480 W/O MODS (ESDS) 415-7002-50 COMM Board – GNS 480 (ESDS) 30A 415-7002-51 COMM Board –...
  • Page 75 Item Description Code Designator -36A 556-0019-01 Fan, 3.7CFM, Magnetic with Connector, Untapped (MUST USE 12A 565-0362-00 Label, UC GNS 480, Baseline Configuration 565-0569-20 Label, Warranty (Factory) -38A 565-0569-30 Label, Warranty (Field) 565-1069 Label, Serial Number -41 664-0008 Permabond™ 200 Adhesive...
  • Page 76 Illustrated Parts List This Page Intentionally Left Blank 7-10 560-7027-00D GNS 480 (CNX80) Maintenance Manual...

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