Figure 13.3 Location Of Indicator Leds And Dc Output Connectors - Tait TB8100 Service Manual

Task 1 —
Check Power-up
and Output
Voltages
TB8100 Service Manual
© Tait Electronics Limited September 2006
1. Before starting any of these fault finding procedures, you must iden-
tify the model and hardware configuration of the PMU under test.
"Identifying the PMU" on page 217
from the product code printed on a label on the rear panel.
2. Set up the test equipment as shown in
not fit the front panel to the subrack.
3. Connect the PMU to the appropriate AC or DC power supply.
Switch the PMU on. The recommended DC input voltage for this
initial power-up is 16VDC (32VDC) [64VDC].
Note
These voltages are above the upper limit of the
user-programmable startup voltage (refer to
page 239). This should ensure that the PMU powers up, even if
the startup voltage limit has been set to the maximum value.
4. Check whether the LEDs
Figure 13.3). If they are, go to
Figure 13.3 Location of indicator LEDs and DC output connectors
rear view
auxiliary DC output connectors
original type
pins 5-8 pins 1-4
1
5
6 2
7 3
8 4
5. Check the output voltage at either PA connector
panel. If the PMU is fitted with an auxiliary power supply board, also
check the output voltage at the connector
voltages should be as listed in
If the output voltages are correct, go to
age is wrong or not present, go to
age is wrong or not present, go to
on page 229.
explains how to identify a PMU
Figure 13.2 on page
b
on the front panel are flashing (refer to
Task 2. If they are not, go to
front view
d
later type
Table 13.1.
Step 6. If the auxiliary output volt-
"Auxiliary Power Supply Board"
Power Management Unit Fault Finding
222. Do
Table 13.4 on
c
PA DC output connectors
c
on the front
d
on the rear panel. The
Task 3. If the PA output volt-
Step 5.
b
223