5-4
888-2406-002
WARNING: Disconnect primary power prior to servicing.
Maintenance and Alignment
5.4
System Test
The purpose of the SYSTEM test is to check the combiner configuration, cabling
and integrity. The length of time required for the SYSTEM test will be indicated on
the display. The test will reduce the transmitter power to 50% of nameplate TPO
(1kW) and will be going through a MUTE cycle for each PA. The antenna VSWR
must be 1.2:1 or less with no faults present in order to run the test. If the VSWR
is too high the test will be aborted, but nothing will be reported in the Fault Log (the
abort screen will read VSWR high). During the test the HIGH ON and LOW ON
buttons will not work. The test can be started at any time and any power level above
50%. If a fault is detected during the test it will be aborted and the fault will be
noted in the Fault Log. Also the user can abort the test at any time by pressing the
OFF button or via the test screen on the Diagnostics Display. The results of the test
will be either Aborted, Failed or Passed. If the test fails, check the Fault Log to find
out why. To run the SYSTEM test press [MORE TEST C]. This will bring up the
screen in Figure 5-1. Press [D] to run the test or [C] to go back to the previous
menu. For further details, see “Self Diagnostics” in Section 6 in this manual.
Figure 5-1
System Test Menu
5.5
Isolation Board Maintenance
There is only 1 Isolation Board in the Z2 transmitter. The board is mounted on the
side of the PA near the center of the transmitter. Access to the board is from the back
of the transmitter. If it is determined that the Isolation Board needs repair or
replacement, the recommended procedure is to completely exchange the board. The
entire Isolation assembly is relatively inexpensive and easy to remove and replace.
The Isolation resistors and RF switches are critical to the proper operation of the
combiner system. Replacement of any parts on the Isolation Boards requires the
proper soldering equipment and techniques to prevent damage to components or the
PC board itself. The isolation resistors all have thermistors attached to them with
epoxy for temperature sensing. Therefore the resistors and thermistors, labeled RT1
- RT8, must be obtained from Harris, pre-assembled. De-soldering on the Isolation
Board requires a lot of heat due to the large amount of ground plane. If the resistors
are not heated and removed properly, the PC board will be damaged and the feed-
throughs pulled out.
Summary of Contents for Platinum Z2 CD
Page 4: ...888 2406 002 WARNING Disconnect primary power prior to servicing ...
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Page 70: ...3 14 888 2406 002 WARNING Disconnect primary power prior to servicing Operator Guide ...
Page 130: ...4 60 888 2406 002 WARNING Disconnect primary power prior to servicing Overall System Theory ...
Page 194: ...6 38 888 2406 002 WARNING Disconnect primary power prior to servicing Troubleshooting ...
Page 196: ...7 2 888 2406 002 WARNING Disconnect primary power prior to servicing Parts List ...
