Tait TB7100, Service Manual

Page: 131 / 370

TB7100 Service Manual Power Supply Fault Finding 133
© Tait Electronics Limited October 2005
Task 4 —
Check Power-up
Configuration
The radio may be configured for one or more of the following power-up
options:
■
battery power sense
■
auxiliary power sense
■
emergency power sense
■
internal-options power sense
A particular option is implemented by inserting the link mentioned in
Table 9.1 . If there is a fault with a power-up option for which the radio is
configured, first confirm that the configuration is correct:
1. Confirm that the correct link or links have been inserted for the
required power-up options (see
Figure 9.2 and Table 9.1 ). For all
except the battery-power-sense option, also check the radio’s
programming as follows:
2. Open the
“Programmable I/O”
form.
3. Under the
“Digital”
tab, scroll to the relevant digital line listed in the
“Pin” field:
■
internal-options power sense:
IOP GPIO
7
■
auxiliary power sense:
AUX GPI
3
■
emergency power sense:
AUX GPI
2
4. For the first two lines, confirm that the
“Power Sense (Ignition)”
option
has been selected in the “Action” field, and “High” or “Low” in the “Active”
field. For the third line, confirm that
“Enter Emergency Mode”
has been
selected.
5. If the link and programming settings are correct, go to Task 5 . If they
are not, rectify the settings and check if the fault has been removed.
If it has, return to
“Initial Tasks” on page 111 . If it has not, go to
Task 5 .
Table 9.1 Implementation of the power-up options
Power-up
option Link to
insert Factory
default
Activation mechanism Connector
Battery
power sense LK1 Link in Connection of 13.8V supply Power connector
Auxiliary
power sense LK2 Link in
AUX GPI
3 line goes high
(If LK1 is in, line floats high;
if LK1 is out, line floats low)
Pin 4 of
auxiliary connector
Emergency
power sense LK3 Link in
AUX GPI
2
line goes low Pin 5 of
auxiliary connector
Internal-options
power sense LK4 Link out
IOP GPIO
7
line goes high Pin 15 of
internal-options connector