Respironics REMstar Choice Service Manual page 54

Troubleshooting
Problem
(continued)
Unit plugged into power outlet
but there is no air flow.
4-22
REMstar Choice LS and Reliance
Possible Causes
When using a 12 volt DC source,
check that the system polarity uses
a negative ground.
Line voltage may have fallen
below 93 VAC when using a 115 V
voltage source, or below 186 VAC
when using a 230 V voltage
source. The internal components
will not function during this
condition.
Motor wire is not securely
plugged to J1 on the main circuit
board.
Transformer is faulty or wiring
connections are not complete.
Corrective Action
See Section 1 for additional DC
system specifications.
Verify that the line voltage is
adequate.
Check the motor wire connection.
Unplug the unit. Remove the unit
cover and the main circuit board.
Check continuity of the following
wiring connections: from the AC
inlet to the transformer, from the
transformer to the circuit board,
and from the transformer to the
voltage selector switch.
WARNING: Electrical Shock
Hazard! AC voltage is exposed
with the cover off and the unit
plugged in.
Plug the unit into the AC supply.
Use care when making
measurements.
Measure the primary voltage of
the transformer between pins 3
(white) and 4 (black). The voltage
is the same as the input voltage
source (100-127 VAC or 200-250
VAC).
A difference between the primary
voltage and the input voltage
determines a fault in the AC inlet,
the primary wiring, or the voltage
selector switch. Repair according
to the wiring diagram.
(continued)
REMstar Service Manual