Respironics ESPRIT Service Manual page 90

Chapter 6
Diagnostic Codes
Diagnostic Code
1012
Troubleshooting
6-24
Diagnostic
Code Code Description
9005 Sensor failure.
Generic sensor failure due to flow
sensor, pressure transducer, or
communication problem.
9007 Air flow sensor cable misconnected
to the oxygen connector (J10) on
sensor PCB.
9008 Oxygen flow sensor cable
misconnected to the air (J12) or
exhalation (J11) connector on
sensor PCB.
9009 Flow sensor calibration data out of
range or lookup table cannot be
read.
A 1012 (air liftoff failure) code indicates an out of range air liftoff value. As
part of power-on self-test (POST), the microprocessor starts the blower and
opens the air valve until the air flow sensor reads a flow rate of 1 LPM. The
step position of the air stepper motor is recorded at this point, and is called
the liftoff value.
The liftoff value is recorded during normal (diagnostic code 1) and diagnostic
mode (diagnostic code 3) startup sequences. The liftoff value (and other
diagnostic information) is also recorded when a 1012 code occurs. If the
blower fails to start spinning, the difference in current draw is zero, and an
8004 diagnostic code is logged. To view the information recorded during 1012
or 8004 events, generate a diagnostic report (DRPT) as described in Section 7.
NOTE: Disregard an 8004 code without an accompanying 1012 code in the
diagnostic log.
Possible causes for a 1012 diagnostic code include:
• The air valve opening position is too low or too high.
Esprit® Ventilator Service Manual © Respironics, Inc.
Recommended Repair
1. Slave in a known-good flow sensor
and cable to each connector (J10,
J11, J12) on the sensor PCB, then
power up until diagnostic mode is
accessible.
2. Replace the sensor PCB.
3. Replace the CPU PCB.
4. Replace the analog PCB.
5. Replace the main PCB.
Connect air flow sensor cable to J12 on
sensor PCB.
1. Connect oxygen flow sensor cable to
J10 on sensor PCB.
2. Replace sensor PCB.
1. Check cable connections.
2. Reprogram the CPU flow sensor
tables by powering up in diagnostic
mode.
3. Slave in a known-good flow sensor
and cable to each connector (J10,
J11, J12) on the sensor PCB, then
power up until diagnostic mode is
accessible.
4. Replace the sensor PCB.
5. Replace the CPU PCB.
6. Replace the main PCB.
REF 580-1000-02 G