Maintenance Manual
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GAD 42 MAINTENANCE MANUAL GARMIN International, Inc. 1200 E. 151st Street Olathe, KS 66062 USA 190-00159-01, Revision A July 2001
GAD 42 MAINTENANCE MANUAL GARMIN International, Inc. 1200 E. 151st Street Olathe, KS 66062 USA 190-00159-01, Revision A July 2001
Maintenance Manual
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...GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 1 Rev. GARMIN International, Inc. 1200 E. 151st Street Olathe, KS 66062 USA Telephone: 913-397-8200 Dealer Line: 1-800-800-1420 Web Site Address: www.garmin.com RECORD OF REVISIONS REVISION A REVISION DATE 07/03/01 Description Initial Release ECO # ----- © Copyright 2001 GARMIN... Corporation All Rights Reserved Except as expressly provided below, no part of GARMIN Corporation. GARMIN Corporation grants permission to download a single copy of this manual...
...GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 1 Rev. GARMIN International, Inc. 1200 E. 151st Street Olathe, KS 66062 USA Telephone: 913-397-8200 Dealer Line: 1-800-800-1420 Web Site Address: www.garmin.com RECORD OF REVISIONS REVISION A REVISION DATE 07/03/01 Description Initial Release ECO # ----- © Copyright 2001 GARMIN... Corporation All Rights Reserved Except as expressly provided below, no part of GARMIN Corporation. GARMIN Corporation grants permission to download a single copy of this manual...
Maintenance Manual
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Include this notice with any reproduced portion of 1979. A GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 2 Rev. LIST OF EFFECTIVE PAGES Page 1 2 3 4 5 6 7 8 9 10 11 12 13 Revision A A A A A A A A A A A A A INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document ...
Include this notice with any reproduced portion of 1979. A GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 2 Rev. LIST OF EFFECTIVE PAGES Page 1 2 3 4 5 6 7 8 9 10 11 12 13 Revision A A A A A A A A A A A A A INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document ...
Maintenance Manual
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TABLE OF CONTENTS Paragraph Page 1.0 INTRODUCTION ...4 2.0 REPAIR ...4 3.0 TECHNICAL SPECIFICATIONS 4 4.0 GAD 42 INSTALLATION 4 5.0 GENERAL DESCRIPTION 4 5.1 Analog PC Board 4 5.2 CPU PC Board 5 6.0 BLOCK DIAGRAM 5 7.0 BASIC THEORY OF OPERATION 5 7.1 Power Supplies 5 7.1.1 Power Input Circuitry 5 7.1.2 Main Power Supply 5 7.1.3 Power Supply (+5 V ...10 7.18 King Serial Transmitters 10 7.19 Discrete Inputs 10 7.20 Valid High Inputs 11 7.21 Control Outputs 11 8.0 ASSEMBLY DRAWING 11 1.0 INTRODUCTION GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 3 Rev. A
TABLE OF CONTENTS Paragraph Page 1.0 INTRODUCTION ...4 2.0 REPAIR ...4 3.0 TECHNICAL SPECIFICATIONS 4 4.0 GAD 42 INSTALLATION 4 5.0 GENERAL DESCRIPTION 4 5.1 Analog PC Board 4 5.2 CPU PC Board 5 6.0 BLOCK DIAGRAM 5 7.0 BASIC THEORY OF OPERATION 5 7.1 Power Supplies 5 7.1.1 Power Input Circuitry 5 7.1.2 Main Power Supply 5 7.1.3 Power Supply (+5 V ...10 7.18 King Serial Transmitters 10 7.19 Discrete Inputs 10 7.20 Valid High Inputs 11 7.21 Control Outputs 11 8.0 ASSEMBLY DRAWING 11 1.0 INTRODUCTION GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 3 Rev. A
Maintenance Manual
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...; Input remote selected course from low speed GPS 429 data 2.0 REPAIR The GAD 42 contains no field-repairable components. Return faulty units to GARMIN for service. 3.0 TECHNICAL SPECIFICATIONS Technical specifications for the GAD 42 are listed in the GAD 42 Installation Manual. 5.0 GENERAL DESCRIPTION The GAD 42 Interface Adapter consists of two internal printed circuit board assemblies, the Analog...
...; Input remote selected course from low speed GPS 429 data 2.0 REPAIR The GAD 42 contains no field-repairable components. Return faulty units to GARMIN for service. 3.0 TECHNICAL SPECIFICATIONS Technical specifications for the GAD 42 are listed in the GAD 42 Installation Manual. 5.0 GENERAL DESCRIPTION The GAD 42 Interface Adapter consists of two internal printed circuit board assemblies, the Analog...
Maintenance Manual
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... the parallel combination of operation. 7.0 BASIC THEORY OF OPERATION 7.1 Power Supplies 7.1.1 Power Input Circuitry DC aircraft power input to the GAD 42 is a transient suppression zener. Three 18-pin header board connectors provide interconnect to the Analog PC board assembly. 6.0 BLOCK DIAGRAM Figure...and producing the following output voltages: • +20 V • +12 V • -12 V • -20 V • +34 V GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 5 Rev. This connector also provides a return path to the superflag output drivers through a 62-pin high-density D-...
... the parallel combination of operation. 7.0 BASIC THEORY OF OPERATION 7.1 Power Supplies 7.1.1 Power Input Circuitry DC aircraft power input to the GAD 42 is a transient suppression zener. Three 18-pin header board connectors provide interconnect to the Analog PC board assembly. 6.0 BLOCK DIAGRAM Figure...and producing the following output voltages: • +20 V • +12 V • -12 V • -20 V • +34 V GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 5 Rev. This connector also provides a return path to the superflag output drivers through a 62-pin high-density D-...
Maintenance Manual
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...circuit conducts current during power interruptions. A switched capacitor inverter generates the -5 V output from +5 V input. 7.2 Superflag Output Drivers The GAD 42 has four superflag outputs, each FET, turning it on. All Z synchro inputs are present on a FET switch allowing the backup storage ...short interval of each driven by transient suppression zeners. 7.3 XYZ Synchro Input Processing Because all XYZ synchro inputs (shown in the GAD 42. The snubber operation is critical to protecting the controller IC output switch from over-voltage transients by a FET superflag driver switch...
...circuit conducts current during power interruptions. A switched capacitor inverter generates the -5 V output from +5 V input. 7.2 Superflag Output Drivers The GAD 42 has four superflag outputs, each FET, turning it on. All Z synchro inputs are present on a FET switch allowing the backup storage ...short interval of each driven by transient suppression zeners. 7.3 XYZ Synchro Input Processing Because all XYZ synchro inputs (shown in the GAD 42. The snubber operation is critical to protecting the controller IC output switch from over-voltage transients by a FET superflag driver switch...
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... circuit. The amplitude of change. The output is used to monitor the AC reference input amplitude, and also is then applied to a zero crossing detector. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 7 Rev. A dual switching diode clamps over-voltage inputs at +5 V and -5 V which are filtered, clamped, and then applied to a differential...
... circuit. The amplitude of change. The output is used to monitor the AC reference input amplitude, and also is then applied to a zero crossing detector. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 7 Rev. A dual switching diode clamps over-voltage inputs at +5 V and -5 V which are filtered, clamped, and then applied to a differential...
Maintenance Manual
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...only the SELECTED CRS DRIVE X/COS and SELECTED CRS DRIVE Y/SIN outputs will be discussed here. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 8 Rev. The push-pull drivers are grounded in the GAD 42. This is present to -Analog Converter All synchro X and Y outputs originate at the D/A ...are protected from indicators requiring it to not be transmitted to 5 V range required by this device reads all DC voltage monitoring in the GAD 42. 7.10 Digital-to turn off SELECTED COURSE DRIVE from over -voltage where required. Resistor scaling networks scale the sampled voltages to the ...
...only the SELECTED CRS DRIVE X/COS and SELECTED CRS DRIVE Y/SIN outputs will be discussed here. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 8 Rev. The push-pull drivers are grounded in the GAD 42. This is present to -Analog Converter All synchro X and Y outputs originate at the D/A ...are protected from indicators requiring it to not be transmitted to 5 V range required by this device reads all DC voltage monitoring in the GAD 42. 7.10 Digital-to turn off SELECTED COURSE DRIVE from over -voltage where required. Resistor scaling networks scale the sampled voltages to the ...
Maintenance Manual
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... serial data receivers. 7.14 Serial EEPROM Configuration and calibration data is stored in a serial EEPROM IC on unit power-up by an 11.8 VDC regulator. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 9 Rev. A A low power micromonitor watchdog holds the CPU in reset if Vcc is too low, and if the...-232 I /O within the CPU. 7.13 FPGA Devices The CPU board contains two FPGA devices which have overvoltage protection provided by RS-232 interface when the GAD 42 is in flash memory. This causes Vcc to the CPU are read through two bus transceivers. If B is low, and A is high, current flows...
... serial data receivers. 7.14 Serial EEPROM Configuration and calibration data is stored in a serial EEPROM IC on unit power-up by an 11.8 VDC regulator. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 9 Rev. A A low power micromonitor watchdog holds the CPU in reset if Vcc is too low, and if the...-232 I /O within the CPU. 7.13 FPGA Devices The CPU board contains two FPGA devices which have overvoltage protection provided by RS-232 interface when the GAD 42 is in flash memory. This causes Vcc to the CPU are read through two bus transceivers. If B is low, and A is high, current flows...
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... identical output drivers on , Vcc is either a discrete input latch or an FPGA input latch. A diode provides transient voltage protection for the inverting output amp. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 10 Rev. During transmission of op-amps which takes authority over the bias resistors. The FPGA output is routed...
... identical output drivers on , Vcc is either a discrete input latch or an FPGA input latch. A diode provides transient voltage protection for the inverting output amp. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 10 Rev. During transmission of op-amps which takes authority over the bias resistors. The FPGA output is routed...
Maintenance Manual
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... A zener provides transient protection for the FET. 8.0 ASSEMBLY DRAWING Figure 2, page 13, shows an assembly drawing (with part numbers) for the GAD 42. When the HDG_VALID_HI input pin is connected to aircraft power voltage over -current protection. This results in a logic low being read by a digital...than 10 V, no base current can flow, and the transistor is applied through a discrete input latch. If the current through a resistor. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 11 Rev. When the HDG_VALID_HI input is open, grounded, or connected to Vcc through a resistor. ...
... A zener provides transient protection for the FET. 8.0 ASSEMBLY DRAWING Figure 2, page 13, shows an assembly drawing (with part numbers) for the GAD 42. When the HDG_VALID_HI input pin is connected to aircraft power voltage over -current protection. This results in a logic low being read by a digital...than 10 V, no base current can flow, and the transistor is applied through a discrete input latch. If the current through a resistor. GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Page 11 Rev. When the HDG_VALID_HI input is open, grounded, or connected to Vcc through a resistor. ...
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GAD 42 Block Diagram Page 12 Rev. A HEADING X HEADING Y REMOTE CRS SELECT X/COS REMOTE CRS SELECT Y/SIN TRUE AIRSPEED X/SIGNAL TRUE AIRSPEED Y/REFERENCE RESERVED (SPARE X IN) RESERVED (... ARINC 561/568 DATA ARINC 561/568 SYNC DRIVER LEVEL SHIFT ARINC 561/568 CONTINUOUS CLOCK KING SERIAL DATA KING SERIAL CLOCK KING SERIAL SYNC GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Figure 1.
GAD 42 Block Diagram Page 12 Rev. A HEADING X HEADING Y REMOTE CRS SELECT X/COS REMOTE CRS SELECT Y/SIN TRUE AIRSPEED X/SIGNAL TRUE AIRSPEED Y/REFERENCE RESERVED (SPARE X IN) RESERVED (... ARINC 561/568 DATA ARINC 561/568 SYNC DRIVER LEVEL SHIFT ARINC 561/568 CONTINUOUS CLOCK KING SERIAL DATA KING SERIAL CLOCK KING SERIAL SYNC GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 Figure 1.
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...-00 (2 PLCS) END PLATE 115-00265-00 SIDE EXTRUSION 135-00007-01 (2 PLCS) INSULATOR COVER 250-00064-00 (2 PLCS) BOARD HEADERS 334-00039-00 (3 PLCS) GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 COVER 115-00266-00 INSULATOR COVER (2 PLCS) 250-00064-00 (REF) INSIDE SURFACE ONLY SCREW 211-632340-06 (4 PLCS) ANALOG...-00 SCREW 211-602340-08 (33 PLCS) CPU BOARD 012-00299-00 HEX STANDOFF 214-00004-00 (4 PLCS) HEX SPACER 214-00020-04 (4 PLCS) Figure 2. A GAD 42 Assembly Drawing Page 13 Rev.
...-00 (2 PLCS) END PLATE 115-00265-00 SIDE EXTRUSION 135-00007-01 (2 PLCS) INSULATOR COVER 250-00064-00 (2 PLCS) BOARD HEADERS 334-00039-00 (3 PLCS) GAD 42 MAINTENANCE MANUAL P/N 190-00159-01 COVER 115-00266-00 INSULATOR COVER (2 PLCS) 250-00064-00 (REF) INSIDE SURFACE ONLY SCREW 211-632340-06 (4 PLCS) ANALOG...-00 SCREW 211-602340-08 (33 PLCS) CPU BOARD 012-00299-00 HEX STANDOFF 214-00004-00 (4 PLCS) HEX SPACER 214-00020-04 (4 PLCS) Figure 2. A GAD 42 Assembly Drawing Page 13 Rev.