Initial Checks - Tait TB8100 Service Manual

8.6

Initial Checks

Task 1 —
Check Power-up
and LEDs
Task 2 —
Check
Configuration and
Alarms
138 Power Amplifier Fault Finding
You can use the TB8100 Service Kit and Calibration Kit to check the basic
operation of the PA without removing the cover.
To check whether the PA powers up correctly and generates any alarms,
carry out Task 1, Task
If the PA has low RF output power, go to
To check the operation of the ambient air temperature sensor board, go
to Task 5.
1. Before starting any of these fault finding procedures, you must iden-
tify the model and hardware configuration of the PA under test.
"Identifying the PA" on page 129
the product code printed on a label on the rear panel.
2. Set up the test equipment as shown in
PA) or Figure 8.4 on page 135
to the subrack.
3. Power up the test set-up and check the LEDs on the front panel of
the PA. These LEDs provide the following information about the
state of the PA:
steady green - the PA is powered up
flashing green - the PA has no application firmware loaded; use
the Service Kit to download the latest version of firmware,
recalibrate the PA, and repeat this step.
flashing red - one or more alarms have been generated; use the
Service Kit to find out more details about the alarms.
If the PA powers up, go to
tion" on page 144.
1. Fit the front panel to the subrack.
2. Run the Service Kit and connect to the base station. Once
connected to the base station, ensure that it is in Run Mode.
3. If you are testing a customer's complete base station, read the base
station to load the PA's configuration information into the Service
Kit.
If you have only the customer's PA, and you are testing it in a test base
station, program the default profile into the test base station. Change
the default frequency as required.
4. Select Configure > Base Station > Channel Profiles. In the Edit
Channel Profile screen go to the Power Saving tab and check that:
the Tx Keyup time is 2ms
Sleep or Deep Sleep modes are not selected.
2, and Task 3.
Task
explains how to identify a PA from
Figure 8.3 on page 134
(12V PA). Do not fit the front panel
Task 2. If it does not, go to
© Tait Electronics Limited September 2006
4.
(28V
"Visual Inspec-
TB8100 Service Manual