Service and repair
8-74
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
8.14.9 BBU PCB and heatsink bars
(See Figure 8-61). Remove the BBU PCB and heatsink bars as follows.
1.
Remove power supply (Section 8.14.7).
2.
Disconnect all harnesses from PCB (both front and rear).
3.
Remove two M3 x 12 flat-head, POZIDRIV™* screws that retain each heatsink bar (full-
size bars at top and bottom of PCB, plus mini-FET heatsink bar) (Figure 8-62).
Figure 8-62. Heatsink bars and conductive strips on BBU PCB
4.
Using 7/32-in. or 5.5-mm nutdriver, remove six M3 nuts and split-ring lockwashers that
retain PCB (Figure 8-63). Lift PCB out.
7-00219
Conductive
strip
Heatsink
bar
Heatsink
bar
Conductive
strip
M3 x 12 flat-head
POZIDRIV™* screw
(6 PL)
FET
heat caps
Notches
down
Mini-FET
heatsink bar
Содержание Puritan Bennett 700 Series
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