Upper Display Fails To Light When Start Is Pressed - Landice L Series Diagnostic And Service Manual

Upper display fails to light when START is pressed.

4.1
Plug Treadmill into wall outlet.
Is green +12V lamp on
4.2
the SCR lit?
Press START button on membrane
4.3
Is green +5V lamp on the SCR lit?
4.4
Is red SERIAL lamp on the SCR lit?
4.5
NO
YES
YES
YES
1. No power from outlet.
2. Loose wire from line cord to SCR.
3. Blown SLOW-BLOW fuse on SCR.
P/N MDA-20 (110V)
4. Failed SCR.
1. Check connections to wire harness.
P/N 70251
2. Check mounting between Faceplate and
Display Board. Reseat if necessary. If
buttons are concave or Display Board will
not stay mounted replace Faceplate. (ST's
& PST's ONLY)
3. Conduct Membrane bypass test
NO
(see pages 62-64) If treadmill starts up
Replace Membrane Panel. (PT's, CT's &
ET's)
4. Replace SCR.
P/N 70080 (110V) P/N 70081 (220V)
Replace SCR.
NO
P/N 70080 (110V) P/N 70081 (220V)
Replace display board
P/N 70252 Executive
P/N 70308 Cardio
P/N 70281 Pro
P/N 70424 Pro Sports
P/N 70329 Sport
100