Tektronix DPO3000 Series, Руководство по обслуживанию

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Maintenance
Front-panel USB
Connector
Use this procedure to remove the front-panel USB connector. You must have
previously removed the rear case assembly, rear chassis, power supply, I/O board,
main board, attenuator board, and front chassis. Use a TORX T15 screwdriver tip,
needle-nose pliers, and a razor knife. (See Figure 5-6 on page 5-15.)
1. Place the front chassis on the work surface with the LCD facing up.
2. Remove the two T15 screws that connect the USB lower bracket to the
chassis, and remove the bracket and its attached EMI clip.
3. Use a pair of needle nose pliers to remove the upper EMI clip from the front
chassis.
4. Turn the front chassis over and use the razor knife to trim off the plastic ears
on both sides of the USB connector. (See Figure 5-6.)
5. Slide the USB connector and cable out toward the front of the chassis. When
reinstalling slide the new USB cable and housing in from the front of the
chassis and push the connector in until it snaps into place.
Front Panel Module Follow these steps to remove the Front Panel module. You need to have previously
removed the rear case assembly, rear chassis, power supply, I/O board, main
board, attenuator board, and front chassis. Use a TORX T15 screwdriver tip. (See
Figure 5-3 on page 5-9.) (See Figure 5-7 on page 5-17.)
1. Remove all the front panel knobs.
2. Remove the 14 T15 screws (10 with ground spring contacts) holding the Front
Panel board to the chassis. When reinstalling torque these screws to 8.0 in/lb.
3. Lift the Front Panel board off of the chassis.
CAUTION.
Do not touch the keypad switch contacts with your fi ngers. The oils
on your fi ngers will degrade or damage the switch contacts. To help prevent
damage to the keypad, use cotton gloves.
Troubleshooting
This section contains information and procedures to help you isolate a defective
module in the oscilloscopes.
WARNING. Before doing this or any other procedure in this manual, read the
General Safety Summary and Service Safety Summary found at the beginning
of this manual. Also, take precautions to prevent ESD damage to electrical
components. (See page 4-1, Preventing ESD.)
MSO3000 and DPO3000 Series Digital Phosphor Oscilloscopes Service Manual 4–13