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Page ii 400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05 Rev. C
The following are General Safety Precautions that are not related to any specific procedure and
therefore do not appear elsewhere in this maintenance manual. These are recommended
precautions that personnel should understand and apply during the many phases of maintenance
and repair.
KEEP AWAY FROM LIVE CIRCUITS.
Maintenance personnel shall observe all safety
regulations at all times. Do not replace components inside the equipment when potentially lethal
voltages are present. Turn off system power before making or breaking electrical connections.
Regard any exposed connector, terminal board, or circuit board as a possible shock hazard.
Components which retain a charge shall be discharged only when such grounding does not result
in equipment damage. If a test connection to energized equipment is required, make the test
equipment ground connection before probing the voltage or signal to be tested.
DO NOT SERVICE ALONE.
Personnel shall not under any circumstances reach into or enter
any enclosure for the purpose of servicing or adjusting the equipment without immediate
presence or assistance of another person capable of rendering aid.
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration
Regulations (“EAR”) issued by the United States Department of Commerce (15 CFR, Chapter
VII, Subchapter C) and which may not be exported, released, or disclosed to foreign nationals
inside or outside of the United States without first obtaining an export license. A violation of the
EAR may be subject to a penalty of up to 10 years imprisonment and a fine of up to
US $1,000,000 under Section 2410 of the Export Administration Act of 1979. Include this notice
with any reproduced portion of this document.
400 SERIES HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the 400 Series.
Mod Levels are listed with the associated service bulletin number, service bulletin date, and the
purpose of the modification. The table is current at the time of publication of this manual (see
date on front cover) and is subject to change without notice. Authorized GARMIN Sales and
Service Centers are encouraged to access the most up-to-date bulletin and advisory information
on the GARMIN Dealer Resource web site at www.garmin.com using their GARMIN-provided
user name and password.
Mod
Level
Service
Bulletin
Number
Service
Bulletin Date
Purpose of Modification
1 SB0019 Nov 7, 2000 14/28V only, Comm Transmitter Fuse
2 SB0101 Feb 16, 2001 14/28V only, Remote COM Transfer
3 SB0203 Feb 1, 2002 430/420; 14/28V only (-10 and –30), Receiver Audio
Compressor (recommended only if problem exists)
4 SB0207 Apr 2, 2002 430/420; Remove excessive solder from Comm Board vias