Initial Checks - Tait TB8100 Service Manual

3.5

Initial Checks

Task 1 —
Check DC Supply
76 Reciter Fault Finding
These initial checks will verify whether:
the reciter powers up correctly
the reciter is correctly configured
any alarms have been generated
the 12.8MHz clock is running.
1. Before starting any of these fault finding procedures, you must iden-
tify the model and hardware configuration of the reciter under test.
"Identifying the Reciter" on page 70
reciter from the product code printed on a label on the rear panel.
2. Set up the test equipment as shown in
3. Power up the reciter using the standard test voltage of 28VDC.
4. Check that the current drawn is within the specified limits. The
current should be as listed in
correct, go to Task
page 82.
Note
All measurements must be made at least 20 seconds after power-
up. This allows the DSP and RISC to power up and initialise the
reciter. Any measurements made during the first 20 seconds after
power-up will be incorrect.
Table 3.1 Typical operating current figures for the reciter
Reciter Configuration
digital board only
a
complete reciter , Rx and Tx on
a. Digital board, RF board, and system interface board fitted and operational.
explains how to identify a
Figure 3.2 on page
Table 3.1. If the current drawn is
2. If it is incorrect, go to
B and C bands
H band
K and L bands
© Tait Electronics Limited September 2006
73.
"Visual Inspection" on
Typical Current
90mA ±5mA
285mA ±5mA
290mA ±5mA
286mA ±5mA
TB8100 Service Manual