Tektronix WFM5250, Service Manual

Page: 44 / 57

Removal and Replacement Procedures
Rear panel/Reference I/O
Board
The rear panel is a one-piece design, with two short sides that slide into the main
chassis. Follow these steps to remove the rear panel:
1. Remove the two pan-head 3 2 X 0.250 T15 screws that attach the rear panel to
the fan bracket. When reinstalling, tighten these to 0.9 N-M (8 in/lb).
2. Remove the
9
/
16
" nuts and their lock washers from the fi ve BNC connectors.
When reinstalling, tighten the nuts to 1.58 N-M (14 in/lb).
3. Remove the knurled nuts and their lock washers from the two SDI input
connectors using a
9
/
16
" spanner socket.
4. Remove the two
3
/
16
" jack screws from the DVI connector. When reinstalling,
tighten these to 0.45 N-M (4 in/lb).
5. Remove the two 40 X 0.375 T8 fl at-head screws that secure the ground clip
and the XLR connector to the rear panel. When reinstalling, install the ground
clip as shown. (See Figure 4.). Tighten the screws to 0.62 N-M (5.5 in/lb).
6. Remove the four 32 X 0.250 T10 fl at-head screws that attach the rear panel
to the sides of the main chassis, two on each side. When reinstalling, tighten
these to 0.9 N-M (8 in/lb).
7. Pull the sides of the main chassis out slightly, to disengage the alignment
tabs from the slots in the rear panel. Then move the rear panel, with the
Reference I/O board still attached, slightly away from the main chassis.
When reassembling, slightly push out the sides of the main chassis until the
alignment tabs engage the slots in the rear panel.
Figure 4: XLR connector ground clip
28 WFM5250 Waveform Monitor Service Manual