Tektronix WFM8200, Service Manual

Page: 67 / 85

Removal and Replacement Procedures
Audio Boards (Options AD
and DPE)
The Audio option boards, if installed, are located in the left center module bay,
near the power supply. (See Figure 4-4 on page 4-26.)
NOTE.
Option DPE replaces Option DDE.
DPE board.
The circuit board for Option DPE may be removed without removing
the entire Audio module.
1. Unsnap the spring clips at each end of the DPE circuit board.
2. Tilt the top of the DPE board away from the Audio Main board.
3. Lift the DPE board out of the instrument.
Analog Audio and Audio Main boards. Remove the entire Audio module as a unit.
If necessary, the two boards may be separated.
1. Remove the four T-15 screws securing the Audio module to the rear panel.
2. Lift the Audio module out of the instrument, rocking it gently until the
connector separates from J4 on the Main board. It may help to loosen the
adjacent rear panel screws.
3. Use a 3 /
16
inch nutdriver to remove the jackscrews securing the ANALOG
AUDIO connector on the rear panel you just removed.
4. Remove the special nuts securing the eight audio BNC connectors to the
rear panel.
NOTE.
Special nuts are used on the BNC connectors due to the close physical
spacing, and a special tool is needed to remove them. (See Table 4-8 on
page 4-24.)
5. Remove the Audio module rear panel from the two circuit boards.
6. Separate the Audio module circuit boards at J130.
Power Supply You may want to remove the audio board module fi rst for increased clearance,
but it is not required.
1. Disconnect the brown, blue, and green/yellow primary wires from the line
fi lter. (See Figure 5-1 on page 5-5.)
2. Disconnect the green/yellow ground wire from the chassis, using a
5
/
16
inch
nutdriver. (See Figure 5-1 on page 5-5.)
3. Disconnect the 10-pin cable from J14 on the Main board.
4. Disconnect the two wire cable from J22 on the Main board.
WFM8200 and WFM8300 Waveform Monitors Service Manual 4–27