Service and repair
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
8-51
Figure 8-42. Controller PCB component locations
8.10.3.7 Removing/installing NVRAM
(See Figure 8-42). Remove the NVRAM (nonvolatile random-access memory) from the
controller PCB as follows. Install by reversing removal procedure.
Caution
To prevent ESD damage, always follow ESD guidelines when handling PCBs or NVRAM.
1.
Open and prop lid (Section 8.5.1).
2.
Disconnect ventilator head harness from upper lefthand corner of pressure solenoid PCB.
3.
Using 5-mm nutdriver, remove seven nuts and internal lockwashers that retain pressure
solenoid PCB. Lift PCB forward so it rests on speaker.
4.
Remove NVRAM (U6), using NVRAM extractor tool (P/N G-061566-00).
NOTE:
• When installing the NVRAM, make sure the dimple located at pin 1 is in the upper
lefthand corner.
• When installing a new NVRAM, follow the procedure in Section 8.10.3.8 to update
the new NVRAM with ventilator data.
NVRAM (U6)
U69
U70
U79
U80
EPROM 2
EPROM 3
EPROM 4
EPROM 1
7-00143
Dimple at
pin 1
Summary of Contents for Puritan Bennett 700 Series
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