Tait TM9100 Service Manual page 161

4.
5.
TM9100 Service Manual
© Tait Electronics Limited August 2005
For the internal-options power-sense option the link LK4 should be
inserted (see Figure 7.2). Connect +3.3V DC (more than 2.6V to
be precise) from the power supply to the
internal-options connector SK102). Check that the power-up signal
at pin 5 of IC602 (see Figure
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.
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 main-board assembly
and go to "Final Tasks" on page
7 line (pin 15 of the
IOP GPIO
7.1) is high.
IOP GPIO
Step 5. If it is not, check for
"Final Tasks" on page 147. If the fault
147.
Power Supply Fault Finding
7 line (to be
Figure 7.1) and
161