Sunrise Medical 931157 service manual Section, Understanding VSI Controller Diagnostics Codes

Section 3

Understanding VSI Controller Diagnostics Codes

3.1 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.

3.2 Two Bars - Left Motor Disconnected

The left hand motor has a bad connection. Check the connections to the left hand motor.

Test Left Motor Open
Check that the batteries are fully charged and in good con-
dition; and check all cables and connections. Check the
connections to the left motor, look for a loose or damaged
connector. Remove the 9-pin Beau plug and check the
resistance across pin 3 and pin 4 as shown in (figure
A3.2.1). If the meter reads between 0 to 1.5 ohms, then	A3.2.1
replace the controller.

If the meter reads between 0 to 1.5 ohms, then replace the controller.

Otherwise, check the brushes on the left motor. Ensure that they are not excessively worn, (replace as required) as shown in (figure A3.2.2).

A3.2.2

Use the meter to check the resistance across the two bot- tom contacts (thicker wires) on the 4-pin motor connector as shown in (figure A3.2.3). If the meter reads between 0 to 1.5 ohms, then replace the main harness. If none of the above corrects the problem, replace the left motor.

A3.2.3

If the meter reads between 0 to 1.5 ohms, then replace the main harness.

If none of the above corrects the problem, replace the left motor.

SUNRISE MEDICAL ASPIRE SERVICE MANUAL 2003 PAGE 5