Alliance Laundry Systems STB75CG - MM Models: no Display after Pressing the ON;SELECT Keys

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Troubleshooting
45. MM Models: No Display After Pressing the ON/SELECT Keys
120 Volt/60 Hertz/1 Phase and 208-240 Volt/60 Hertz/1 Phase Gas and Steam Nonreversing
208-240 Volt/60 Hertz/3 Phase and 480 Volt/60 Hertz/3 Phase Gas and Steam Reversing/
Nonreversing
NOTE: Make sure fuse on x1 line of transformer is operational. Used for 480 Volt/60 Hertz/3 Phase voltage.
NOTE: If unable to change settings, the keyboard has been manually locked out. To lock or unlock, press and
hold the START pad and press TIME.
MM Models: No display
after pressing the
ON/SELECT keys
Is there
120 VAC across
COM and Neutral
(P3) terminals on
PC board?
TMB2172S
Correct wiring between TB1-L1
and COM on PC board or
between TB1-N and P3 (Neutral)
on PC board for low voltage.
Correct wiring between COM on
PC board and X1 of transformer for
480 Volt/60 Hertz/3 Phase voltage.
No
Replace
PC board.
Yes