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3M Electronic Marking System EMS Marker Locator with iD ReadWrite 7420 User Manual

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3M™ Dynatel™ 
Electronic Marking System (EMS) 
Marker Locator with iD Read/Write 7420 
Operator’s Manual
7420 EMS Marker/Tape Locator with iD Read/Write 
7420E EMS Marker/Tape Locator with iD Read/Write
September 2012
78-9000-0431-4-C
3 

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Contents
1. Safety Information ........................................................................\
...................................4
A. Intended Use ........................................................................\
.......................................4
2. Quick Start  ........................................................................\
...............................................5
A. Locator Battery...

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78-9000-0431-4-C 3
Congratulations! You have just purchased one of the finest, most advanced Electronic 
Marker locating devices available today!
The 3M
™ Dynatel™ EMS Marker/Tape Locators 7420/7420E are designed to locate 
3M™ EMS Caution Tape 7600 Series, EMS Markers, and will read and write unique 
user information to 3M iD Markers. iD markers allow information such as a unique 
serial number (preprogrammed), facility data, application type, placement date and 
other details to be read, stored and...

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1. Safety Information
Please read, understand and follow all safety information contained in these instructions 
prior to the use of the 3M™ Dynatel™ EMS Marker/Tape Locators 7420/7420E. Retain 
these instructions for future reference.
A.  Intended Use
The 3M™ Dynatel™ EMS Marker/Tape Locators 7420/7420E are designed and tested for 
use in locating 3M™ EMS Caution Tape 7600 Series, 3M™ EMS Markers and 3M™ iD 
Markers. 3M caution tape and markers are used to identify buried utilities...

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2. Quick Start
A.  Locator Battery
1. Twist cap to open battery compartment.
2. Slide battery into handle. 
1 Lithium Ion battery 
pack or 8 'AA' (LR 6) 
size Alkaline Batteries
Use the AC charger to charge the Lithium Ion battery pack. 
1. Plug the AC charger into a power outlet. 
2.  Plug the charging cord into Lithium Ion battery cable. Make sure that the key on the 
plug fits properly into the slot in the connector. 
The AC charger is meant for charging the Lithium Ion...

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The locator batteries are tested for two seconds every time the unit is turned on.
The Bar Graph [11] on the display screen will fill to the relative battery level.
The Battery Icon [8] on the Locate Screen will continuously indicate the battery level 
remaining for the locate mode that you are using.
B.  Cleaning the Locator Unit
To clean the locator unit, wipe with a damp cloth.
C. Service and Accessories
Information regarding service, accessories, or replacement parts can be...

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D. 7420 EMS Locator Keypad and Display Definitions
1
2
3
4
5
6
9
7
13
14
Access panel 
on bottom side 
of locator under 
rubber cover
[1] On/Off (Power): Turns unit on and off.
[2]   Locate:  Sets the locator to trace mode for locating markers. 
[3A]  Speaker Volume Icon : Indicates the relative volume level of the locator.
[3]   Speaker Volume Control: [2] Adjusts the volume of the locator (off, low, medium, 
a nd h ig h).
[4]  Gain Adjust: Adjusts the sensitivity of the locator...

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3. Menu Displays
A.  Main Menu
When the Menu [6] button is pressed, the Main Menu display appears. 
The function appears on the display above each soft key.
1.  Write Mode: System used to write information to 3M™ iD Markers
2.  Data/Template:  Displays marker history and 
template creation/selection displays:
a.  Read History – 100 memory locations for 
Read iD markers
b.  Write History – 100 memory locations for 
Written iD markers
c.  User Templates  – Create and edit iD 
templates...

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4. >>More:  Advances to next menu display
5.  More  - Advances to next menu display
e. 

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4. Locating 3M™ Electronic Markers and 
3M
™ iD Markers
A.  7420E-Model Initial Configuration
Attention: All 7420E-Model (Export) iD Locators must run the initial configuration 
setup found in the 3M™ Dynatel™ Locator PC Tools software. The 3M™ Dynatel™ PC 
Tools software is available free of charge at www.3M.com/dynatel under the Software 
section; 2550/2573/2250M/2273M/7420 Locator PC Tools xx.x.x (EXE xx.xMB).
Note: 7420 Model Locators ship with all marker types enabled (). 7420...
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