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Removal and Replacement Procedures
8.
Disconnect the cable that connects the Reference I/O board at J7 with the
FPGA board. Then set the rear panel, with Reference I/O board attached, on
the static-free work surface.
CAUTION.
Use care when removing the cable attached to J7 on the Reference I/O
board. If you let the connector tip to the side while disconnecting the cable you
may bend some of the pins on the board. Pull the connector straight away from
the board when removing the cable to avoid bending pins.
Reference I/O board/rear panel.
This procedure is only necessary if you are
replacing the Reference I/O board:
1.
On the rear panel, remove the two
3
/
16
" jack screws that attach the Ground
Closure Interface connector to the Reference I/O board. When reinstalling,
tighten these to 0.45 N-M (4 in/lb).
2.
Separate the Reference I/O board from the rear panel.
3.
Place the I/O board on the static-free work surface.
Fan bracket/Main Chassis
1.
Remove the two pan-head 32 X 0.250 T15 screws that attach the fan bracket
to the main chassis. When reassembling, tighten these to 0.9 N-M (8 in/lb).
When reinstalling the fan bracket, make sure not to pinch any cables between
the fan bracket and the main chassis. (See Figure 5.)
2.
Carefully lift the fan bracket and fans out of the main chassis. Note the way
the fan cables are wound around the fans, then unwind them and drape the
fan bracket over the side of the main chassis (in order to get them out of the
way of removing the boards below).
3.
Continue disassembling the instrument. You
fi
rst must remove the FPGA
board and the Video I/O board in order to access the fan drive connectors,
which are located below these boards on the CPU board.
WFM5250 Waveform Monitor Service Manual
29
Summary of Contents for WFM5250
Page 1: ...xx WFM5250 Waveform Monitor ZZZ Service Manual P077080000 077 0800 00...
Page 2: ......
Page 6: ......
Page 24: ...Theory of Operation 8 WFM5250 Waveform Monitor Service Manual...
Page 36: ...Troubleshooting Figure 2 Video I O board 20 WFM5250 Waveform Monitor Service Manual...
Page 52: ...Repackaging Instructions 36 WFM5250 Waveform Monitor Service Manual...
Page 57: ...Replaceable Parts Figure 10 WFM5250 Exploded View WFM5250 Waveform Monitor Service Manual 41...