eschmann T20-a - Bellows and Telescopic Covers

T-SM47j P23/54
T20-a
OPERATION TABLE
v Test that the bellows work correctly by moving table
through several complete sequences of extreme tilt
and Trendelenburg (use handset not standby panel).
6.2.3.5 Top of column access
i Remove the steel covers (items 12, 13 and 14 of
Fig. 6.1) surrounding the top of the bellows (two
screws per side cover, three screws per end cover).
ii Remove twelve screws holding the four top bellow
clamping strips (item 10 of Fig. 6.1) in place. This
will release the top of the bellows allowing them to
be lowered gaining access to the top of the column.
iii On completion of work on the top of the column,
replacing the bellows and steel covers in the reverse
of the sequence above, checking that the bellows
have been correctly positioned in their top and
bottom clamps. Use threadlock (part number
670650) on all screws.
vii Test that the bellows work correctly by moving table
through several complete sequences of extreme tilt
and Trendelenburg movements (use handset not
standby panel).
6.2.4 Telescopic covers
6.2.4.1 Removal of telescopic covers
CAUTION
Ensure the ribbon cable from the standby
control panel and the earth wire are released
during removal of covers, see ‘v and vii’ below.
To remove the telescopic covers completely from the
column proceed as follows, but note that access to the
column can be gained by releasing the telescopic covers
not removing them (see sections 6.2.3.2 and 6.2.3.3):
i Raise the height of the tabletop sufficiently to expose
the screws at the lower edge of the lowest telescopic
section where it joins the base covers.
ii Remove the two screws from lower edge of each
side of the lowest telescopic cover (not the end face
screws). See note in 6.2.3.2 (ii).
iii Remove fourteen plastic rivets (see inset of Fig. 6.1
for details) around the lower edge of the bellows.
iv Lift the bellows to the left and right of the accessory
and switch panels (items 8 and 9 of Fig. 6.1) and
remove the four screws securing the top edge of
the upper telescopic cover to the telescopic cover
support brackets (item 6 of Fig. 6.1).
v Lower the telescopic covers slowly until sufficient
access has been gained behind them to allow
disconnection of the standby control panel ribbon
cable from its connection on the column PCA.
vi Continue to lower the telescopic covers and
disconnect the earth wire from the middle telescopic
cover where it is connected to the wrap round.
vii Remove the four screws (two per join) holding the
top telescopic section together and remove the
section. Continue removing the top telescopic
section (disconnecting the earth link as required)
until all sections have been removed. Note
orientation of parts for later assembly.
6.2.4.2 Refitting the telescopic covers
i Ensure the plastic scratch and noise reducers are
in place on the lower and upper edges of each
telescopic section before starting to refit them.
ii Refit the covers by reversing the removal sequence
detailed above, checking that the earth connections
and the standby control panel are reconnected. Use
threadlock (part number 670650) on all screws.
iii On completion, test that the telescopic covers move
correctly, by powering tabletop (use handset not
standby panel) up and down from minimum to
maximum several times. Check bellows work
correctly by moving table through several complete
sequences of extreme tilt and Trendelenburg
movements. Then check all the functions of the
standby panel
6.2.5 Bellows
WARNING
Removal and replacement of the bellows entails
removal of the trunk sections, which are heavy
and require two people to lift safely.
6.2.5.1 Removal of the bellows
To remove the bellows completely proceed as follows, but
note that access to the column can be gained by releasing
the telescopic covers and bellows without removing them
(as detailed in section 6.2.3):
i Remove as much as possible from the tabletop
including all sections fitted to the two trunk sections
and the mattress.
ii Release the top of the bellows as detailed in section
6.2.3.5, points ‘i-ii’.
iii Release the bottom of the bellows as detailed in
section 6.2.3.4, points ‘i-ii’.
iv Reach inside the bellows and remove the four
screws (two per panel) securing the switch panel
retainers (item 7 of Fig. 6.1) to the accessory panel
and the switch panel (items 8 and 9 of Fig. 6.1). The
switch panel retainers can now be removed.
v Remove the trunk sections (see note below) together
with the traversing and break mechanisms by
removing the four screws that secure this assembly
to the top of the pedestal (two M10 hexagonal head
screws underneath each side). Carefully place the
trunk sections to one side, leaving them in a stable
position not resting on any fragile components.