Troubleshooting - DeVilbiss PD1000 Service Manual

V. TROubLEsHOOTING
PrOblEM
Type I-
The unit does not deliver a
pulse with each inhalation
while properly connected to a
pressurized cylinder with the
post valve open.
Type II-
The regulator is leaking or the
gauge is broken or not reading
accurately.
Type III-
The cannula fitting is broken.
Type IV-
There is leakage between the
tank and the PD1000.
Type V-
Broken, damaged, or
non-functioning rotary selector.
7
Testing Vacuum switch
T R O u b L E s H O O T I N G
SOlUTION
1. Verify that the batteries are good and of specified type.
2. lf batteries are good, verify proper cannula connection and that patient is nose
breathing.
3. If yes, remove top and bottom covers (Section VI, C). Use a digital volt meter
and check the resistance across the Vacuum Switch (figure 7) with Rotary
Selector "OFF" when breath is simulated.
4. Refer to Section VI, E. If the resistance doesn't go to "0" when breath is simu-
lated, change the vacuum switch.
5. If the resistance goes to "0" check the solenoid voltage (3VDC) when breath is
simulated and set to 6 LPM. (Refer to Figure 8)
6. If no voltage is present, change the PC Board.
7. If voltage is present, change the solenoid.
Refer to Section VI, C to remove the Regulator/Gauge Assembly and replace the
gauge or regulator.
Refer to Section VI, D to change the cannula fitting.
Close the tank valve, loosen the knob and verify that the post, the PD1000 regu-
lator yoke and the tank surfaces are smooth and free of burrs. If they are smooth,
replace the regulator seal (#9286-RD). Refer to section VI, A.
Remove covers and replace rotary selector. Refer to Section VI, C.
5
8
Testing solenoid Voltage
LT-1859