Service and repair
8-66
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
8.14 Power assembly
Warning
To prevent electrical shock hazard, always unplug the power cord from facility power
and disconnect the external and internal battery harnesses from the BBU PCB before
servicing the power assembly.
Caution
To prevent damage to ESD-sensitive components, always follow ESD guidelines when
servicing the power assembly.
8.14.1 Power cord
The 700 Series Ventilator main power cord retainer (G-061942) has been modified to
strengthen it. In order to access the power cord, remove and replace the retaining rivet with
a replaceable screw. The power tray back plate (G-060447) was also modified. All units
currently shipped have the newer back plate and power cord retainer installed. If replacing a
power cord retainer on an older unit, replace the power tray back plate, also. To gain access
to power cord, loosen one M3 x 8 POZIDRIV™* screw with captive washers, in slot of power
cord retainer (Figure 8-53). Swing retainer up. Unplug power cord from line filter.
8.14.2 Removing power assembly
Remove the power assembly components as follows. Install the power assembly by reversing
procedure.
1.
Open and prop lid (Section 8.5.1).
2.
Disconnect BBU (battery backup) PCB/ventilator head harness from controller PCB and
cable management bar (motor/encoder connector) (Figure 8-40). Using 2.5-mm hex
driver, remove M3 x 8 screw, internal lockwasher, and flat washer that retain harness-
retaining tie wrap to air intake manifold.
3.
Remove eight M3 x 12 POZIDRIV™* screws with captive washers that attach power
assembly to ventilator (Figure 8-52). Pull out power assembly until it reaches a stop
(Figure 8-53).
4.
Partially thread harness through cutout and into power assembly compartment.
5.
To remove power assembly completely,
lift up at front
. Power assembly will slip clear of
stop.
6.
Disconnect internal battery harness from BBU PCB.
7.
Ease BBU PCB/ventilator head harness completely into power assembly compartment.
Summary of Contents for Puritan Bennett 700 Series
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