Apollo SL40 User manual

Apollo
Model SL40 VHF COMM Transceiver
Field Maintenance Manual
PRELIMINARY
April, 1997 Draft 3 560-1014-00

1997 by II Morrow Inc. All rights reserved.
Printed in the USA
No part of this document may be transmitted, reproduced, or copied in any form or by any means
without the prior written consent of II Morrow Inc. Due to II Morrow’s commitment to
constantly improve the quality and performance of our products, information contained in this
document is subject to change without notice.
II Morrow and Apollo are registered trademarks of II Morrow Inc.
II Morrow Inc. 2345 Turner Rd. SE
PO Box 13549 Salem, OR 97302
Salem, OR 97309 USA
Phone [phone]
1-800-525-6726
In Canada 1-800-654-3415
FAX [phone]

HISTORY OF REVISIONS
Revision Date Description
-- 4/8/97 Draft 3.
ORDERING INFORMATION
To receive additional copies of this publication, order part # 560-1014, Apollo SL40 VHF
COMM Transceiver Field Maintenance Manual.
REFERENCE PUBLICATIONS
Following are other publications referenced in this guide.
IPC 610A Acceptability of Electronic Assemblies
560-0956 Apollo Model SL40 VHF COMM Transceiver Installation Manual

NOTES

Table of Contents
Apollo SL40 Field Maintenance Manual i
TABLE OF CONTENTS
SECTION 1 - INTRODUCTION.................................................................................................1
ABOUT THIS MANUAL......................................................................................................................1
APOLLO SL40 DESCRIPTION.............................................................................................................1
FEATURES.........................................................................................................................................1
REGULATORY COMPLIANCE .............................................................................................................2
HANDLING CONSIDERATIONS ...........................................................................................................2
ESD PROTECTION..................................................................................................................................................... 2
COMPONENT HANDLING............................................................................................................................................ 3
SHIPPING CONSIDERATIONS....................................................................................................................................... 3
OTHER TOOLS AND EQUIPMENT .......................................................................................................3
TOOLS....................................................................................................................................................................... 3
TEST EQUIPMENT ...................................................................................................................................................... 3
SECTION 2 - TROUBLESHOOTING.......................................................................................5
OVERVIEW........................................................................................................................................5
ESD SAFE WORK AREA REQUIREMENTS .........................................................................................5
PRELIMINARY CHECKOUT.................................................................................................................5
SYSTEM FUNCTIONS .........................................................................................................................6
SOFTWARE VERSION DISPLAY................................................................................................................................... 6
SIGNAL STRENGTH DISPLAY...................................................................................................................................... 6
AUDIO NOISE LEVEL DISPLAY................................................................................................................................... 6
HEADPHONE LEVEL DISPLAY AND ADJUSTMENT ...................................................................................................... 7
INTERCOM SQUELCH THRESHOLD DISPLAY AND ADJUSTMENT................................................................................. 7
INTERCOM AUDIO LEVEL DISPLAY AND ADJUSTMENT.............................................................................................. 7
SIDETONE LEVEL DISPLAY AND ADJUSTMENT .......................................................................................................... 7
BASE STATION LOCKOUT MODE DISPLAY AND ADJUSTMENT................................................................................... 8
TEST MODE OPERATION...................................................................................................................9
TEST MODE ACCESS ................................................................................................................................................. 9
GENERAL OPERATION ............................................................................................................................................... 9
TEST MODE PAGE ..................................................................................................................................................... 9
DISPLAY TEST FUNCTION.......................................................................................................................................... 9
CONTROLS TEST FUNCTION .................................................................................................................................... 10
TEST SETUP ....................................................................................................................................10
EQUIPMENT TESTS..........................................................................................................................12
TRANSMITTER...........................................................................................................................13
TRANSMITTER PERFORMANCE ................................................................................................................................13
T
RANSMITTER FREQUENCY ERROR ......................................................................................................................... 13
TRANSMITTER POWER MEASUREMENT................................................................................................................... 14
TRANSMITTER MODULATION................................................................................................................................... 15
TRANSMITTER SNR (SIGNAL TO NOISE RATIO)........................................................................................................ 16
TRANSMITTER AUDIO DISTORTION........................................................................................................................... 17
RECEIVER....................................................................................................................................17
RECEIVER PERFORMANCE....................................................................................................................................... 18
SPEAKER AUDIO TEST...................................................................................................................................... 18
RECEIVER SENSITIVITY................................................................................................................................... 19
UNIT DISASSEMBLY /REASSEMBLY................................................................................................20
DISASSEMBLY ......................................................................................................................................................... 20
REASSEMBLY .......................................................................................................................................................... 21

Table of Contents
ii Apollo SL40 Field Maintenance Manual
REPLACEABLE COMPONENTS ......................................................................................................... 22
COMPONENT LISTING...............................................................................................................................................22
REPLACEMENT POLICY............................................................................................................................................22
PACKAGING FOR SHIPMENT .....................................................................................................................................22
CONTACTING THE FACTORY FOR ASSISTANCE................................................................................ 22
SECTION 3 - CHECKOUT PROCEDURES .......................................................................... 25
GENERAL ....................................................................................................................................... 25
SERVICE VERIFICATION.................................................................................................................. 25
FUNCTIONAL CHECKOUT................................................................................................................ 25
DISPLAY CHECK ......................................................................................................................................................25
CONTROLS TEST......................................................................................................................................................25
TRANSMITTER TESTS...............................................................................................................................................25
RECEIVER TESTS .....................................................................................................................................................25
APPENDIX A - TEST DATA LOG .......................................................................................... 27
POST INSTALLATION CHECKOUT .................................................................................................... 27
SIDETONE LEVEL ADJUSTMENT...................................................................................................... 27
FLIGHT TEST CHECK ...................................................................................................................... 27
LIST OF TABLES
TABLE 1 REPLACEABLE COMPONENTS.......................................................................................... 22
LIST OF ILLUSTRATIONS
FIGURE 1 SL40 FRONT PANEL ........................................................................................................ 2
FIGURE 2. TEST SETUP DIAGRAM................................................................................................... 11
FIGURE 3. EQUIPMENT CONNECTION.............................................................................................. 11
FIGURE 4. TRANSMITTER TEST SETUP............................................................................................ 14
FIGURE 5. RECEIVER TEST SETUP .................................................................................................. 19
FIGURE 6. COM MAIN BOARD OUTLINE......................................................................................... 20

Introduction
Apollo SL40 Field Maintenance Manual 1
SECTION 1 - INTRODUCTION
ABOUT THIS MANUAL
This manual provides performance checkout instructions, troubleshooting instructions to the
board level, disassembly and reassembly procedures, and test procedures to verify that the unit
is once again operational. It is intended for use by persons certified by the Federal Aviation
Administration (FAA) to repair aircraft communication devices.
Provides an introduction to the SL40 unit, details handling and shipping
considerations for the components, and lists required tools and test equipment.
Includes all troubleshooting procedures, test setups, disassembly/reassembly, and
identifies replaceable components.
Includes checkout procedures to ensure that repairs have been properly
completed and unit is fully serviceable
Includes post repair test data log sheets.
APOLLO SL40 DESCRIPTION
The Apollo SL40 is a 760 channel VHF Comm transceiver. It is one member of the Apollo
slimline series which includes the SL40 Comm, the SL50 GPS, and the SL60 GPS/Comm.
FEATURES
The features of the SL40 Comm include:
• 760 channels
• Frequency range of 118.000 to 136.975 MHz
• Active and standby frequency display
• 16 character high-intensity alphanumeric LED display
• Automatic display intensity
• Back-lit buttons
• Transmit status indicator
• Frequency memory and recall functions
− from remote source
− eight last used
− eight user stored
• Weather channels
• Frequency monitor function
• Built-in intercom function
• Stuck mic time-out
• Two microphone inputs
• Internal non-volatile memory - no battery required
• Full range input supply voltage
• 12 watt audio amplifier
Section 1
Section 2
Section 3
Appendix A

Introduction
2 Apollo SL40 Field Maintenance Manual
REGULATORY COMPLIANCE
The Apollo SL40 is designed and tested to meet the following TSOs:
FAA TSO-C37d for transmit
FAA TSO-C38d for receive
FAA TSO-C128 for unintentional transmission (stuck mic)
The Apollo SL40 complies with the FCC requirements specified in:
CFR 47, Part 87, Aviation Services, Subpart D, Technical Requirements
CFR 47, Part 15, Radio Frequency Devices, Subpart B, Unintentional Radiators
The Apollo SL40 software is designed and tested to RTCA/DO-178B, level C.
Note: Unauthorized changes or modifications to the SL40 may void the compliance to
required regulatory agencies and authorization for continued equipment usage.
HANDLING CONSIDERATIONS
ESD PROTECTION
The case on the SL40 is designed to protect the components from mechanical damage and
also provides protection from damage due to electrostatic discharge. Open the case only
when the unit is in an ESD safe work area. Observe proper ESD techniques when
working on the unit.
Figure 1 SL40 Front Panel

Introduction
Apollo SL40 Field Maintenance Manual 3
COMPONENT HANDLING
The SL40 contains electrostatic discharge sensitive (ESDS) components. Care must be
taken when handling these devices to prevent damage. Special precautions for ESD work
areas are detailed in ESD Safe Work Area Requirements, Page 5. Both you and the work
surface must be properly grounded before handling the SL40 components. If moving the
SL40 components from one area to another, they must either be reinstalled in the SL40
case or placed in an anti-static bag.
SHIPPING CONSIDERATIONS
All SL40 components must be returned to the factory in anti-static packaging equivalent
to that used to ship the components from the factory. Save the packaging from the
replacement components to use when returning the failed component. Packaging
instructions are provided on Page 22. If you have questions regarding shipment of the
SL40 components, contact the II Morrow Service Department. Information on how to
contact the factory is provided on Page 22.
OTHER TOOLS AND EQUIPMENT
The following tools and test equipment (or equivalent) are required to properly evaluate
and test the SL40. All test equipment must be calibrated before performing the test
procedures in this manual.
TOOLS
A 3/32” hex tool is required to remove the SL40 from the mounting frame in the aircraft.
A #2 Phillips screwdriver is required for disassembly
TEST EQUIPMENT
a. Power Supply:
HP6433B DC Power Supply (0-36 V 0-10A) or equivalent
b. RF Signal Generator:
HP8920 RF Communications Test Set or equivalent
c. Multimeter
FLUKE 8010A Digital Multimeter or equivalent
d. Test interface
Refer to Figure 2 for the Test Interface schematic and SL 40 transceiver setup.

Introduction
4 Apollo SL40 Field Maintenance Manual
NOTES