Microwave Data Systems MDS 4310, Установка, эксплуатация и техническое обслуживание на месте

Страница: 80 / 129

MDS 05-2415A01, Rev. A FIELD TESTS & ADJUSTMENTS 4-19
TEST PROCEDURE
➏
:
REMOTE MAINTENANCE MODULE—
Loopback Code Programming, Mode Selection, Calibration & Testing
Introduction
The Remote Maintenance Module (Figure 4-7) is a small PC board assembly that mounts
vertically into Jacks J5 and J7 of the transceiver PC board. The module contains two
adjustable controls—Loopback TX Audio Level (R6), and Temperature Setting (R33).
Normally, R6 needs adjustment only when the module is first installed in the radio. R33 is
adjusted at the factory.
The following procedures are not required for units shipped from the factory with Remote
Maintenance installed. Perform these procedures only if the Remote Maintenance Module is
being newly installed, is known to be out of adjustment, or if the Remote Maintenance
Module is being replaced.
NOTE
If you are unsure whether a Remote Maintenance Module is
installed in the transceiver, open the Diagnostics Channel with
the Hand-Held Terminal and enter the
STAT
command. The
display responds with the type of diagnostics that are installed
in the transceiver. The forth character will show an
I
if the
module is installed, or a
U
if it is not installed. (See Table 3-2 to
interpret the full response.)
R6
LOOPBACK TX
AUDIO LEVEL
J7 J5
R33
TEMP. SET
Figure 4-7. Remote Maintenance Module (P/N 03-1958A01)
NOTE
In a properly aligned system, Remote Maintenance provides
valuable information to service personnel, however, it is not a
substitute for calibrated test equipment.
Loopback Code Identification
A loopback code is used to identify the radio during diagnostics operations. Each radio in the
system must have a unique four digit numerical loopback code for Remote Maintenance
diagnostics to work properly. The code should be one that is not being used elsewhere in the
system in which the radio will be installed; duplicate codes can cause failure in or incorrect
data from radios having the same loopback codes.
To determine the current loopback code, connect the HHT to the radio and open the
Diagnostics Channel. Next, type
LBC
. The radio responds by displaying the code on the HHT