Covidien Puritan Bennett 700 Series, Руководство по обслуживанию

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Service and repair
8-50 10070389 Rev. A Puritan Bennett™ 700 Series Ventilator System Service Manual
NOTE:
• When installing a new controller PCB, always transfer the NVRAM and software
EPROMs from the existing controller PCB to the new PCB. The NVRAM contains
calibration constants specific to the components in your ventilator. The EPROMs
contain the ventilator software. The unit cannot ventilate if either the NVRAM or
EPROMs are missing.
• When replacing a NVRAM, be sure that the ventilator is running software revision J
or later, and upgrade the software if necessary. Use the Reset serial number function
(Section 4.2.3.7) to enter the ventilator’s serial number once the new NVRAM is
installed.
• If the NVRAM on the existing controller PCB fails, you must install a new NVRAM into
the controller PCB and update the new NVRAM with ventilator data following the
procedure in Section 8.10.3.8.
8.10.3.6 Removing/installing software EPROMs
(See Figure 8-42). Remove the software EPROMs (erasable programmable read-only 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 EPROMs.
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 set of four software EPROMs (U69, U70, U79, and U80) using 32-pin, PLCC-type
EPROM removal tool (P/N G-061914-00) (Figure 8-43).
NOTE:
When installing EPROMs:
• Make sure they are oriented so that notch is in the upper lefthand corner.
• Align each EPROM on its socket, then apply pressure evenly to completely insert the
EPROM.