Upper Display Board Fails To Light When Start Is Pressed - Landice 8700 Series Service Manual

SYMPTOM

Upper display board fails to light when START is pressed.

4.1
Is the AC PWR light on
the relay board lit?
YES
4.2
Is the VDC light on
the relay board lit?
YES
4.3
1. Unplug the 12 wire connector from the relay board and inspect all wires for a loose
fit or pushed pin. Be sure harness is routed under the elevation motor and secured
with a plastic wire zip-ty.
2. Unplug the 14 wire connector from the upper dsiplay board and inspect all wires
for a loose fit or pushed pin.Check for 9 to 14VDC from black to green wires.
Are harness wire connections intact?
4.4
Replace the upper display board. Part#
70191-CL (SPRINT), 70173-CL (SST),
70196-CL (PRG)
1.Plug a lamp into the wall outlet to confirm
it is live.
2.Check line cord condition and connections.
NO
3.Unplug treadmill and use a multimeter to
check the fuse. If it is bad, swap with a
spare MDA-20 fuse.
4.Plug in treadmill and use a multimeter to
check for 120VAC across HOT and NEUT
terminals of relay board.
1.Check all connections to black, 9VDC power supply.
2.Confirm the black wire with a dashed white line (or a
ribbed edge) is plugged into +VDC terminal on the
relay board.
NO
3.Confirm the solid black wire is plugged into SGND
terminal on the relay board.
4.Replace 9VDC power supply. Part # 5302
YES NO
Repair upper harness or replace upper
harness. Part # 72011
61