Welbilt FB081TF, Service Manual

Page: 69 / 96

Part Number REV00 04/08/2020 69
Section 7 Component Check Procedures
HOME POSITION SWITCH
Function
Prevents blender motor operation if the step motor does
not return to the home (up) position.
Specification
SPST Normally Open Switch
Location
On Blender Assembly / Linear Slide bracket. One switch on
left side bracket and one switch on the right side bracket.
Check Procedure
Use a voltmeter/ohm meter to check switch operation.
1. Inspect the switch for correct wiring. On Blender Board
at J13 Terminal, 1 = Blue Terminal 2 = Brown.
2. Isolate the switch by disconnecting the wiring
connectors. On Blender Board at J13 Terminal, 1 = Blue
Terminal 2 = Brown.
3. Check continuity across the switch terminals in the
open and closed position. Replace the switch if
continuity readings do not match both switch settings.
On Blender Board at J13 Terminal, 1 = Blue Terminal
2 = Brown.
• Open (OL) = Replace motor.
• Resistance (0) = Motor is good.
DOOR SWITCHES
Function
Prevents blender motor operation if the door/switch is not
closed.
Location
Magnetic switch is located on top of the Blend Chamber /
Linear Slide Bracket access from the back side. The relay
switch is located on each Blender Assembly bracket.
Specification
One (1) Magnetically operated SPST normally open switch
per Blender per side. One (1) Relay switch per blender per
side.
Check Procedure
Use a voltmeter/ohm meter to check switch operation.
1. Inspect the switch for correct wiring.
2. Isolate the switch by disconnecting the wiring
connectors.
3. Check continuity across the switch terminals in the
open and closed position.
Remove = (Replace the switch if continuity
readings do not match both switch settings.)
• Open (OL) = Replace motor.
• Resistance (0) = Switch is good.