Sunrise Medical DeVilbiss 505DZ Service Manual page 16

The diagnostic system will also keep the last diagnostic light failure sequence in memory.This gives the service technician the ability
to view the cause of a unit shutdown after the unit has been turned off.
To view the light sequence corresponding to the unit malfunction without opening the unit:
1. Turn the unit "On."
2. Open the air filter door.
3. Use the plastic error indicator tool (part #303DZ-635) or other non-metallic tool to press and release memory switch "S"
through the single access hole located to the left of the three vertical diagnostic light access holes. The PC board will display the
light sequence for the last failure mode (unless the memory has been cleared).
WARNING—Electric Shock Hazard. Do not use metal or other conductive tools when pressing the memory
switch; doing so may cause personal injury and product damage.
After viewing the light sequence, the memory may be cleared for future assistance.
To clear the diagnostic light memory:
1. Unplug unit while still running. Do not turn the unit "Off." Do not plug the unit back into the wall outlet until the first alarm
sounds (approximately 10 seconds).
2. Plug unit back into the wall outlet. This process will reset diagnostic light memory.
P A T I E N T A L E R T & D I A G N O S T I C S Y S T E M
Pediatric flow meter
bleed off
Memory switch access hole
Diagnostic lights
16
Figure 16