Set Up; Error Codes; Realignment - Midland Syn-Tech 70-342XL Service Manual

Vhf (wide band)
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COMPLETE ALIGNMENT
7 0 - 3 4 2 ~ ~ / 4 4 2 ~
* * *
*
ERROR CODES
* * * *
Error code 9 0 , 91, 92, 9 3 , and
94
appearing
in the
channel
display
with
continuous triple-beeps indicates the E/PROM module is
missing,
improperly
inserted,
or
incorrectly programmed.
Check
the
E/PROM
module
or
refer to the E/PROM Programming section
in
this
service
manual.
Error code 9 5 . appearing
in the channel display with
a
triple-beep
indicates
the
synthesizer phase-lock-loop cannot
achieve
lock.
A
defect is present and must be corrected.
REALIGNMENT PROCEDURE
THIS
PROCEDURE
IS
ONLY NECESSARY if alignment has been
changed
by
component
change or tampering.
THE E/PROM MUST BE REPROGRAMMED
for
special test frequencies.
--
Set-Up
--
1.
Remove the
8
securing screws to remove the top and bottom covers.
2.
Remove the E/PROM Module.
Replace it with another E/PROM Module
that has been programmed with the following channels.
INCLUDE
THE CENTER FREQUENCIES as described in the E/PROM Programming
section.
A-BAND XCVR
Test Channel 1 - RX
156.00 MHz
Test Channel 1 - TX
156.00 MHz
Test Channel 2 - RX
148.00 MHz
Test Channel 2 - TX
148.00 MHz
Test Channel 3 - RX
136.00 MHz
Test Channel 3 - TX
135.00 MHz
B-BAND XCVR
174.00 MHz
174.00 MHz
160.00 MHz
160.00 MHz
150.00 MHz
150.00 MHz
3.
Turn the volume control to a mid position and the squelch control
fully counterclockwise.
4.
Supply 13.6 volts DC power to transceiver 5391.
Connect
[ + I
to
pin 9 and
[ - I
to pin 7.
Connect a resistive, 5 0 ohm RF load
(with a wattmeter) to antenna connector 5392.

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