GENERAL INFORMATION
1-4
November 1999
Part No. 001-7780-500
are times when the technicians have sp ecific questions
that need to be answered in orderto completely iden-
tify and repair a problem.
When returning equipment for repai r,it is als o a
good idea to use a PO number or some otherreference
number on your paperwork in case you needto call
the repair lab about your unit.These numbers are
referenced on the repair order and it makes it easie r
and faster to locate your unit in the lab.
Return Authorization (RA) numbers are not
necessary unless you have been givenone 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 cont act the Field Service
Department when the unit arrives.
1.8 REPLACEMENT PARTS
Replacement parts can be ordereddirectly from
the Service Parts Department. To order parts by
phone, dial the toll-free number as described in
Section 1.6. When ordering, pleasesupply the part
number and quantity of each part ordered. EFJohnson
dealers also need to give their accountnumber. If there
is uncertainty about the part number,include the
designator (C512, for example) and the modelnumber
of the equipment the part is from.
Youmay 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. JohnsonCompany
Service Parts Department
299 Johnson Avenue
P.O . Box 1 249
Waseca,MN 56093-0514
1.9 INTERNET HOME PAGE
EFJohnson has a site on the WorldWide Web that
can be accessed for informationon the company and
such things as products, systems,and regulations. The
address is http://www.efjohnson.com.
1.10 INTRINSICALLYSAFE INFORMATION
NOTE: Contact your sales representativeto determine
the availability of intrinsically safe models .
1.10.1 INTRODUCTION
Intrinsically safe 7780 transceivers havebeen
approved by the FactoryMutual Research Corporation
for operation in certain flammable atmospheres. The
specific atmospheres in which operationis a pproved
are shown in Section 1.10.5 and alsoon the label on
the back cover of the transceiver.
WAR NING
When servicing an intrinsicallysafe transceiver, these
rules must be followed to maintainintrinsic safety:
•Service can be provided only by thefactory or by
service centers specifically authoriz ed by the
Factory Mutual Research Corporation to service
E.F.Johnson intrinsically safe transceivers. Contact
Factory Mutual at the followingaddress for infor-
mation concerning their auditingprocedure.
Contact the E.F.Johnson Customer Service Depart-
ment as described in Section 1.6 ifyou 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 t he 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 intrinsicallysafe 7780
models.
1.10.2 DEFINITIONS
Intrinsically Safe - This is a fire ratin g given to these
transceivers by the Factory MutualResearch Corpora-