Self-tests
3-4
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
For example, if the LEDs flash in this order (where X = LED on and O = LED off):
O O O O = 0
X O O X = 9
O O O X = 1
O O O O = 0
O X X O = 6
The diagnostic code is 09106. (See Chapter 6 for complete information on
diagnostic codes.)
.
Table 3-2: POST routines
Section of POST
Description of routine
POST1
(UI and BD)
Microcontroller tests – Test registers and watchdog timers. Initializes microcontroller.
POST1
(UI and BD)
RAM tests
POST1
(UI and BD)
Segment and stack initialization – Initializes kernel memory segments and stacks.
POST1 (UI)
POST retries test – Determines whether POST has started, but failed to complete, three times.
POST1
(UI and BD)
Completion of microcontroller initialization
POST1
(UI and BD)
I/O initialization test – Checks digital I/O read registers to verify digital I/O was properly
initialized by hardware.
POST1
(UI and BD)
I/O initialization – Initializes digital outputs.
POST1
(UI and BD)
User interface initialization – Initializes all UI indicators.
POST1 (UI)
EPROM checksum test
POST1
(UI and BD)
Clock signal test – Verifies frequency of clock signal from other microcontroller.
POST1 (BD)
Motor controller chipset clock test – Verifies frequency of motor controller chipset clock.
POST1 (UI)
DUART test
POST1
(UI and BD)
POST1 completion
POST2 (BD)
Bus monitor test – Verifies the microcontroller’s bus monitor can detect bus error conditions.
POST2 (BD)
Start of piston test – Initializes and checks motor controller chipset, then starts piston
movement test to check motor and optoswitches.
POST2 (BD)
Voltage tests – 5 V controller PCB supply voltage and +1.2 V pressure solenoid PCB
reference.
POST2 (BD)
BD serial EPROM read – Reads calibration and other transducer constants from serial EPROM
on pressure solenoid PCB and writes them to RAM to facilitate later accessing.
POST2 (BD)
EPROM checksum test
POST2 (BD)
Completion of piston test
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