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TB7100 Service Manual Power Supply Fault Finding 135

4. For the internal-options power-sense option the link LK4 should be

inserted (see Figure 9.2). 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 9.1) 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 9.1) 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 123. If the fault

could not be found or repairs failed, replace the main-board assembly

and go to “Final Tasks” on page 123.

Tait TB7100 Service Manual

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