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Troubleshooting
Isolating to a Board If Power Will Not Come Up
If the mains power is on, a red light is visible through the right side of the
instrument.
If the on/standby pin (TP6 on the Power Side board) is low, the instrument
determines that power is on.
If the instrument determines that power is on, a red light means that there is an
over-current condition.
Remove boards one at a time to locate a fault. the Display Adapter board, the
CD-RW/DVD assembly, the Time Base board, the Optical Front-End board, the
Electrical Front-End board, The Power Side board, the ATX board, and the Bridge
board. (See Figure 4-3 on page 4-11.)
If you remove the ATX board, you must jumper the debug power-on pin. This
pin, J401 is on the front of the Power Side board (which faces to the inside of the
instrument). Locate the “Force Power” label on the back of the board (which
faces you), and then reach around the edge of the board to jumper the pins. (See
Figure 4-23.)
The Power PC board and the Power Side board are required for power to come up.
If removing the boards did not
fi
nd the problem, replace the Low Voltage Power
Supply board.
Figure 4-23: Location of debug pins
4–54
DSA8300 Digital Serial Analyzer and Modules Service Manual
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