Filter
Top Products
GENERAL INFORMATION
1-4
November 1999
Part No. 001-7780-500
are times when the technicians have specific questions
that need to be answered in order to completely iden-
tify and repair a problem.
When returning equipment for repair, it is also a
good idea to use a PO number or some other reference
number on your paperwork in case you need to call
the repair lab about your unit. These numbers are
referenced on the repair order and it makes it easier
and faster to locate your unit in the lab.
Return Authorization (RA) numbers are not
necessary unless you have been given one by the Field
Service Department. RA numbers are required for
exchange units or if the Field Service Department
wants to be aware of a specific problem. If you have
been given an RA number, reference this number on
the Factory Repair Request Form sent with the unit.
The repair lab will then contact the Field Service
Department when the unit arrives.
1.8 REPLACEMENT PARTS
Replacement parts can be ordered directly from
the Service Parts Department. To order parts by
phone, dial the toll-free number as described in
Section 1.6. When ordering, please supply the part
number and quantity of each part ordered. EFJohnson
dealers also need to give their account number. If there
is uncertainty about the part number, include the
designator (C512, for example) and the model number
of the equipment the part is from.
You may also send your order by mail or FAX.
The mailing address is as follows and the FAX
number is shown in Section 1.6.
E.F. Johnson Company
Service Parts Department
299 Johnson Avenue
P.O . Bo x 124 9
Waseca, MN 56093-0514
1.9 INTERNET HOME PAGE
EFJohnson has a site on the World Wide Web that
can be accessed for information on the company and
such things as products, systems, and regulations. The
address is http://www.efjohnson.com.
1.10 INTRINSICALLY SAFE INFORMATION
NOTE: Contact your sales representative to determine
the availability of intrinsically safe models.
1.10.1 INTRODUCTION
Intrinsically safe 7780 transceivers have been
approved by the Factory Mutual Research Corporation
for operation in certain flammable atmospheres. The
specific atmospheres in which operation is approved
are shown in Section 1.10.5 and also on the label on
the back cover of the transceiver.
WAR NING
When servicing an intrinsically safe transceiver, these
rules must be followed to maintain intrinsic safety:
• Service can be provided only by the factory or by
service centers specifically authorized by the
Factory Mutual Research Corporation to service
E.F. Johnson intrinsically safe transceivers. Contact
Factory Mutual at the following address for infor-
mation concerning their auditing procedure.
Contact the E.F. Johnson Customer Service Depart-
ment as described in Section 1.6 if you have
questions.
Factory Mutual Research Corporation
1151 Boston-Providence Turnpike
P.O. Box 9102
Norwood, Massachusetts 02062
Phone: (617) 762-4300
• Replace the battery pack only with Intrinsically
Safe Battery Pack, Part No. 587-8150-136.
• Do not make any modifications to the circuitry.
• When replacing a part, use only the exact replace-
ment part listed in the service manual parts list.
• Do not install any accessory that is not specifically
approved for use with intrinsically safe 7780
models.
1.10.2 DEFINITIONS
Intrinsically Safe - This is a fire rating given to these
transceivers by the Factory Mutual Research Corpora-