TM8100 Mobile Radio
Service Manual
Diagnosis of Faults on Main Board
177
May 2004 © Tait Electronics Limited
Task 4 —
Check Digital Power-up
Signals
The radio may be configured for one or more of the power-up options
listed in
. A particular option is implemented by inserting the
link mentioned in the table. The activation mechanism is the condition
that results in the digital power-up signal at pin 5 [at 6F6/6E6] of IC602
(see
) becoming active.
The functioning of the power-up options may be checked as described
in Steps 1 to 4 below; information on rectifying faults is also given. If
there is a fault with a particular power-up option for which the radio is
configured, carry out the procedure described in the relevant step.
1.
For the 13V8-power-sense option the link LK1 [at 6C6/6E3]
should be inserted (see
). Check the power-up signal
while first disconnecting and then reconnecting the 13.8 V DC
supply at the power connector. The signal should go high when
the power is reconnected. If it does, return to
. If
it does not, check for continuity and shorts to ground between the
link LK1 and the
+13
V
8
BATT
input at the power connector PL100.
Repair any fault and return to
.
2.
For the auxiliary-power-sense option the link LK2 [at 6B6/6E2]
should be inserted (see
). C3.3 V DC (more
than 2.6 V to be precise) from the power supply to the
AUX GPI
3
line (pin 4 of the auxiliary connector SK101). Check that the
power-up signal is high. Remove the +3.3 V supply and ground
the
AUX GPI
3
line (to be precise the voltage on the line should be
less than 0.6 V). If the signal is correct, return to
.
If it is not, check for continuity and shorts to ground between
D601 [at 6C6/6E3] (see
) and pin 4 of the auxiliary
connector. Repair any fault and return to
3.
For the emergency option the link LK3 [at 6B5/6D2] should be
inserted (see
). Connect the
AUX
GPI
2
line (pin 5 of the
auxiliary connector SK101) to ground. Check that the power-up
signal is high. Remove the connection to ground. If the signal is
correct, return to
. If it is not, check for continuity
and shorts to ground in the path from D601 [at 6C5/6D3] (see
), via Q600 [at 6C5/6D2] (see
), to pin 5 of
the auxiliary connector. Repair any fault and return to
.
4.
For the internal-options-power-sense option the link LK4 [at
6B4/6C2] should be inserted (see
). C3.3 V
DC (more than 2.6 V to be precise) from the power supply to the
IOP GPIO
7
line (pin 15 of the internal options connector SK102).
Check that the power-up signal is high. Remove the +3.3 V
supply and ground the
IOP GPIO
7
line (to be precise the voltage on
the line should be less than 0.6 V). If the signal is correct, return
to
. If it is not, check for continuity and shorts to
ground between D604 [at 6C4/6C3] (see
) and pin 15
of the internal options connector. Repair any fault and return to
.
Содержание TM8000 Series
Страница 32: ...32 Introduction TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Страница 78: ...78 Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Страница 106: ...106 General Information TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Страница 124: ...124 Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
Страница 164: ...164 Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 Tait Electronics Limited ...
