TM9100 Service Manual Power Supply Fault Finding 159
© Tait Electronics Limited August 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 7.1. 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 7.2 and Table 7.1). 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 GPIO7
■ auxiliary power sense: AUX GPI3
■ emergency power sense: AUX GPI2
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 139. If it has not, go to
Task 5
.
Table 7.1 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 GPI3 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 GPI2 line goes low Pin 5 of
auxiliary connector
Internal-options
power sense
LK4 Link out IOP GPIO7 line goes high Pin 15 of
internal-options connector
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