Tait TM8100 mobiles Service Manual page 177

TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
4. For the internal-options power-sense option the link LK4 should be
inserted (see Figure
be precise) from the power supply to the
internal-options connector SK102). Check that the power-up signal
at pin 5 of IC602 (see
Remove the +3.3V supply and ground the
precise the voltage on the line should be less than 0.6V). If the power-
up signal is now low, conclude with
continuity and shorts to ground between D604 (see
pin 15 of the internal-options connector SK102. Repair any fault and
go to Step 5.
5. After checking all the relevant power-up options, and if necessary
repairing any faults, go to
could not be found or repairs failed, replace the board and go to
"Final Tasks" on page
7.2). Connect +3.3V DC (more than 2.6V to
IOP GPIO
Figure 7.1) is high.
Step 5. If it is not, check for
"Final Tasks" on page
163.
Power Supply Fault Finding
7 line (pin 15 of the
7 line (to be
IOP GPIO
Figure 7.1) and
163. If the fault
177