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1-1
November 1998
Part No. 001-7600-001
GENERAL INFORMATION
SECTION 1 GENERAL INFORMATION
1.1 SCOPE OF MANUAL
This service manual contains operation, installa-
tion, programming, alignment, and service information
for the EFJohnson® 7610 and 7640 mobile transceiv-
ers.
1.2 TRANSCEIVER DESCRIPTION
1.2.1 GENERAL
The 7600-series mobile transceivers operate on
conventional (non-trunked) channels. The 7610 oper-
ates in the VHF frequency range of 146-174 MHz, and
the 7640 operates in the UHF frequency range of
400-430, 450-470, 470-490, or 488-512 MHz. Up to
32 channels can be programmed. Power output is user
selectable or fixed for the following levels. Refer to
Section 3.1 for more information on features.
Model High Low 1 Low 2
7610 (VHF) 45W 25W 4.5W
7640 (UHF) 35W 20W 3.5W
These transceivers are digitally synthesized and
microprocessor controlled. Transceiver programming
is performed using a PC-compatible computer, a spe-
cial EFJohnson programming cable, and program-
ming software (see Table 1-1). The alignment proce-
dure is performed using this same hardware setup, a
fabricated test cable, and special Adjust software
included with the programming software (see
Section 4).
1.3 PRODUCT WARRANTY
The warranty statement for this transceiver is
available from your product supplier or from the War-
ranty Department, EFJohnson, 299 Johnson Avenue,
P.O. Box 1249, Waseca, MN 56093-0514. This infor-
mation may also be requested from the Warranty
Department by phone as described in Section 1.7. The
Warranty Department may also be contacted for War-
ranty Service Reports, claim forms, or any other ques-
tions concerning warranties or warranty service.
1.4 PART NUMBER BREAKDOWN
The following is a breakdown of the part number
used to identify this transceiver.
1.5 TRANSCEIVER IDENTIFICATION
The transceiver identification number is printed
on a label that is attached to the chassis. The following
information is contained in the identification number:
1.6 ACCESSORIES
The accessories available for this transceiver are
listed in Table 1-1.
1.7 FACTORY CUSTOMER SERVICE
The Customer Service Department of EFJohnson
provides customer assistance on technical problems
and the availability of local and factory repair facili-
ties. Regular Customer Service hours are 7:30 AM. -
242 - 7 6
x
x - 0 x
x
Band
Config.
Freq Range
0 = Half duplex, dual
IF, high power
1 = VHF
4 = UHF
0 = Full band
1 = 400-430 (UHF)
3 = 146-174 (VHF)
450-470 (UHF)
4 = 470-490 (UHF)
5 = 488-512 (UHF)
2 = Std mic
3 =
With DTMF
mic
7 = w/o mic
NOTE: Not all configurations
are available.
Type
Signaling
0 = Conventional only
76xx 0 A 23 8 J 12345
Model Revision
Letter
Manufacture
Date
Warranty
Number
Week No.
of Year
Last Digit of Year
J = Japan
8th Digit
of P.N.
PlantFrom P.N.