Garmin 155XL Maintenance Manual Download

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Garmin International

1200 E. 151

Street

Olathe, KS 66062 USA

190-00067-25 (Rev D)

April 1999

*36;/

0$,17(1$1&(0$18$/

Summary of Contents for 155XL

Page 1: ...Garmin International 1200 E 151st Street Olathe KS 66062 USA 190 00067 25 Rev D April 1999 36 0 17 1 1 0 18...

Page 2: ...orage medium to be viewed and to print one copy of this manual or of any revision hereto provided that such electronic or printed copy of this manual or revision must contain the complete text of this...

Page 3: ...CPU Power Supply Circuits 1 4 1 3 3 GPS Receiver 1 5 1 3 4 Interface Board and Data Cards 1 6 1 3 5 Altitude Decoder Board 1 6 Section 2 SPECIAL TOOLS AND TEST EQUIPMENT 2 1 INTRODUCTION 2 1 2 2 SPECI...

Page 4: ...4 3 3 Removing the Altitude Decoder Chassis Subassembly 4 2 4 3 4 Interface Board Removal 4 2 4 3 5 CPU Board Removal 4 3 4 3 6 GPS Receiver Assembly Removal and Disassembly 4 3 4 3 7 Power Switch As...

Page 5: ...190 00067 25 Rev D iii TABLE OF CONTENTS Continued Section 6 REPLACEABLE PARTS 6 1 INTRODUCTION 6 1 Section 7 ASSEMBLY DRAWINGS 7 1 INTRODUCTION 7 1...

Page 6: ...CTION TEST PAGE 5 3 5 2 OBI TEST PAGE 5 5 5 3 I O TEST PAGE 5 6 5 4 ANNUNCIATOR TEST PAGE 5 6 5 5 EXTERNAL SWITCHES TEST PAGE 5 7 5 6 ALTITUDE DECODER TEST PAGE 5 8 5 7 OBS SELECTED COURSE TEST PAGE 5...

Page 7: ...d uses the latest techniques in manufacturing technology In order to achieve the desired reliability size and power requirements surface mount components are used extensively Specialized equipment and...

Page 8: ...DESCRIPTION Internally the GPS 155XL is divided into six printed circuit boards Main GPS Receiver Altitude Decoder Interface Display Keypad Circuit Figure 1 1 shows the block diagram for the GPS 155XL...

Page 9: ...Read Only Memory ROM System memory Discrete Input Output I O Serial communication drivers and receivers Power supply These items are discussed in detail in the following paragraphs Figure 1 3 shows t...

Page 10: ...dication OBI clock data sync ARINC 429 and RS 232 two channels are also included Figure 1 3 shows the Main Board block diagram Figure 1 3 GPS 155XL Main Board Assembly Block Diagram 1 3 2 2 CPU Power...

Page 11: ...gh precision crystal oscillator Ceramic RF filter RF and IF amplifiers Mixers IF filter The frequency synthesizer uses the high precision oscillator as a reference frequency for the phase detector in...

Page 12: ...he data card A plastic race secures the Interface Board at the front of the unit and serves to guide the data card onto a 40 pin connector 1 3 5 Altitude Decoder Board The Altitude Decoder Board conta...

Page 13: ...ed For any questions regarding special tools and test equipment contact the GARMIN Customer Service Department listed on Page 1 1 2 2 SPECIAL TOOLS AND TEST EQUIPMENT Test Harness User Supplied Test P...

Page 14: ...2 2 190 00067 25 Rev D Figure 2 1 J2 Test Setup Test Harness Diagram...

Page 15: ......

Page 16: ...he following equipment or a suitable substitute is necessary to perform troubleshooting 1 Power Supply Capable of 10 33 Volts 6 Amps 2 Digital DVM Fluke 8000A 3 BFGoodrich Precision Track Selector 4 G...

Page 17: ...ery see section 5 3 Osc needs adjustment Replace GPS receiver board see section 4 3 6 Replace CPU board see section 4 3 5 Power down and re init Turn unit off and then back on again Verify connection...

Page 18: ...specified replace the CPU board 3 Check the voltage between L504 and ground as shown in Figure 3 1 The voltage should read between 9 6 and 14 4 V If the voltage is out of the specified limits replace...

Page 19: ...3 4 190 00067 25 Rev D Figure 3 1 CPU Board Power Supply Test Points Top View...

Page 20: ...190 00067 25 Rev D 3 5 Figure 3 2 CPU Board Test Points Bottom View...

Page 21: ...place Control Display Unit see section 4 3 2 Display brightness not adjustable via photocell Replace Control Display Unit see section 4 3 2 Replace CPU Board see section 4 3 5 Keycaps have no backligh...

Page 22: ...xternal power connection Replace CPU Board see section 4 3 5 No serial data output Replace CPU Board see section 4 3 5 No external CDI output or external CDI functions improperly Check connections and...

Page 23: ...HT FROM STATOR E STATOR G 5 RESERVED 6 RESERVED 7 OBI CLOCK 8 OBI DATA 9 APPROACH ARM LOW 10 NAV SUPER FLAG 11 RESERVED 12 ARRIVAL ANNUN 13 APPROACH ACTV ANNUN 14 ROTOR C 15 ARINC 429 OUT B 16 ARINC 4...

Page 24: ...4 RESERVED 5 RESERVED 6 RESERVED 7 RESERVED 8 RESERVED 9 RESERVED 10 RESERVED 11 RESERVED 12 RESERVED 13 SEQUENCE HOLD LOW 14 ALTITUDE D4 15 ALTITUDE A1 16 ALTITUDE A2 17 ALTITUDE A4 18 ALTITUDE B1 19...

Page 25: ...3 10 190 00067 25 Rev D 3 7 INTERCONNECT DIAGRAM Figure 3 3 shows the GPS 155XL interconnect diagram to aid in troubleshooting Figure 3 3 GPS 155XL Interconnect Diagram...

Page 26: ...e given in paragraph 4 4 Disassemble the unit only to the extent necessary to remove and replace parts or assemblies Replaceable parts and assemblies are listed in Table 6 1 4 2 REQUIRED TOOLS Standar...

Page 27: ...U Board without completely removing the Altitude Decoder Subassembly 4 Remove Screw 11 and completely remove the Altitude Decoder Chassis 5 Remove the Ribbon Cable from the J13 Connector on the Altitu...

Page 28: ...9 Remove two screws 5 that hold CPU Board to the main chassis 10 Carefully pull up on the CPU Board away from the power switch 4 3 6 GPS Receiver Assembly Removal and Disassembly Figures 7 2 7 3 1 Re...

Page 29: ...Removal Figure 7 4 1 Remove covers as described in paragraph 4 3 1 2 Remove CDU as described in paragraph 4 3 2 3 Remove two Rotary Switch Knobs by loosening two Set Screws 1 on Inner Knob 2 4 After...

Page 30: ...reversing the steps followed in paragraph 4 3 5 Be sure to pull up on the retaining lip of the ZIF Connector J804 before inserting the flexible circuit cable 5 Mount the Interface Board to the Chassi...

Page 31: ...4 6 190 00067 25 Rev D This page intentionally left blank...

Page 32: ...sensitive components Observe proper anti static procedures when testing the unit 5 2 TEST EQUIPMENT Test Fixtures Test Harnesses are User Supplied Load and signal information given in Figures 2 1 and...

Page 33: ...ss is described in the GPS 155XL Pilot s Guide 1 Remove Covers as described in paragraph 4 3 1 2 Open Altitude Chassis Subassembly 3 Carefully turn unit over and remove the CPU Board Bottom Side Shiel...

Page 34: ...on every other pixel and shows a checkerboard pattern The fourth pattern turns on every third pixel and shows a diagonal stripe pattern 2 Observe the test patterns and verify the display and backligh...

Page 35: ...90 40 mV at full scale deflection 5 Rotate the inner function knob clockwise to select TO Verify the DMM voltage is 83 20 mV CDI Nav Flag Test 1 Rotate the outer function knob clockwise 2 Measure volt...

Page 36: ...5 VDC 9 Rotate the outer function knob counterclockwise until CLOCK is selected 10 Rotate the inner function knob clockwise to select DATA 11 Measure voltage across J1 8 and J1 22 12 Rotate the outer...

Page 37: ...tor Test Page 1 Press the CRSR key 2 Rotate the outer function knob until the Annunciator Test Page is displayed Figure 5 4 3 Press the CRSR key once 4 Rotate the inner function knob to turn the front...

Page 38: ...te the outer function knob clockwise to select the APPR annunciator test 16 With the Appr annunciator off verify the DMM voltage is greater than 4 5 VDC 17 Rotate the inner function knob to turn the A...

Page 39: ...ition The External Switches test page should display REMOTE ENT OFF Altitude Decoder Test Figure 5 6 Altitude Decoder Test Page This test exercises each altitude data line individually Most altitude c...

Page 40: ...ion Verify that the input course is now 150 0 2 5 Attach OBS Signals to respective pins on Precision Track Selector Set Track Selector to 60 240 and 330 Verify that in each instance the input course i...

Page 41: ...or on the display with a finger and verify the display intensity percentage number decreases and the display grows dimmer GPS Receiver Noise Test Figure 5 10 GPS Receiver Test Page 1 Depress the ENT k...

Page 42: ...te Page is displayed and the annunciator next to the RTE key is on 12 Press the WPT key Verify the Select Waypoint Type Page is displayed and the annunciator next to the WPT key is on 13 Press the CRS...

Page 43: ...rch the sky for available satellites and collect almanac data A search the sky operation may take twenty to thirty minutes to complete The unit must enter 3D navigation mode The unit must display the...

Page 44: ...x Ckt 011 00231 00 Sub Assy Rtry Sw w Flex Ckt 011 00296 01 Svce GNC300XL Dspl Module 012 00067 01 Svce XL Keyboard 012 00092 00 Svce GNC300 Interface Bd 012 00205 50 Svce GPS155XL CPU 115 00060 00 SM...

Page 45: ...32 30032 00 E Ring Std Metric Flat 3 2 233 00017 00 Jack Screw 250 00002 00 Insulator Rubber TO 220 250 00035 00 Shoulder Washer 250 00056 00 Shoulder Washer 252 00004 00 Neoprene Spacer GPS150 253 00...

Page 46: ...ordering purposes The only parts which are candidates for ordering replacing are listed in Table 6 1 Notes are included on the drawings for informational purposes The following drawings are included...

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