TM8100/TM8200 Service Manual Power Supply Fault Finding 171
© Tait Electronics Limited June 2006
4. 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
IOP GPIO7 line (pin 15 of the
internal-options connector SK102). Check that the power-up signal
at pin 5 of IC602 (see Figure 7.1) is high.
Remove the +3.3V supply and ground the
IOP GPIO7 line (to be
precise the voltage on the line should be less than 0.6V). If the power-
up signal is now low, conclude with Step 5. If it is not, check for
continuity and shorts to ground between D604 (see Figure 7.1) and
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 “Final Tasks” on page 157. If the fault
could not be found or repairs failed, replace the board and go to
“Final Tasks” on page 157.
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