PRELUDE SERVICE MANUAL
PAGE 7
2006
SUNRISE MEDICAL
Section 4
Understanding VR2 Controller Diagnostics Codes
If the chair runs while two bars are flashing, chair indicates
low battery voltage. Refer to section 4.1.
If the chair does not run while flashing two bars check the
connections from the right motor to the controller, look for a
loose or damaged connector.
Use a volt meter to check the resistance across the two
bottom contacts with connector for plug on upside of plug
as shown in (figure a4.2.2). If the meter reads between
0-1.5 then proceed by swapping the motor leads into the
controller. Turn unit off and back on and if two bar flash is
still present, replace the controller.
If the meter does not read between 0 – 1.5 proceed by
swapping the motor leads into the controller. Turn unit off
and back on, if two bar flash becomes a four bar flash,
replace the right motor.
4.2 Two Bars – Right motor Disconnect / Low battery voltage
4.1 One Bar - Low Battery Voltage )
This code could indicate discharged batteries, failed batteries, or poor battery connections. Begin by recharging the bat-
teries and then refer to Section 1 to check batteries and connections.
A4.2.1
A4.2.2
Programmer will indicate left motor fault. Motor faults are reversed on this unit.
If none of the above corrects the problem, replace the left motor.
If the meter reads between 0 to 1.5 ohms, then replace the controller.