Removal and Replacement of Components
Ch. 10
TRACKMASTER
106
TMX428 TMX428CP & TMX58 Service Manual
317-160-406 Rev 4
May 2021
Smart Power Supply Relay Board Replacement TMX428 Series
Tools required
Wire Cutters or Utility Knife
Grounding Wrist Strap
1/4” Hex
Nut Driver or
3/32”
Flat Blade Screw Driver
5/16” Hex Nut Driver
Approximate time to complete 1 hr 15 min
1.
Turn treadmill main power switch to the OFF position.
2.
Unplug treadmill plug from the wall receptacle.
3.
Allow treadmill to discharge for 3 minutes.
4.
Remove the (5) hood securing bolts.
5.
Set hood to the side of treadmill.
6.
Put on the grounding wrist strap, ground it to the power cord ground screw.
7.
Unplug the 4-conductor JP2 and 3-conductor JP1 plugs from the SPSR Board (smart power supply
relay board).
8.
Unplug Cooling Fan J1-Red and J2-Blk single conductor spades from the SPSR Board.
9.
Unplug E-Stop J4-Black and J5-Gray single conductor spades from the SPSR Board.
10.
Unplug Pull Tether J6-Black and J7-Gray single conductor spades from the SPSR Board.
11.
Unplug Speed Sensor J10-two conductor from the SPSR Board.
12.
Unplug Elevation Count Sensor J11-three conductor from the SPSR Board.
13.
Unplug Drive Harness J15-ten conductor from the SPSR Board.
14.
Remove the RS232 harness J13 by unscrewing the (2) flat head screws retaining it to the SPSR
Board.
15.
Cut the Zip tie on USB harness J14 and unplug from the SPSR Board.
16.
Remove two control board bracket screws
17.
Remove screw that holds circuit board to control board bracket. Relocate standoff and spacer transfer
to new Power supply board.
18.
Remove the nylon nuts on the four corners of the SPSR Board.
19.
IMPORTANT! Once removed, Note the position of the voltage switch on the SPSR Board.
20.
Set voltage switch on the new SPSR Board as noted in STEP 19.
IF WRONG VOLTAGE
DAMAGE WILL OCCUR!
21.
Reverse procedure to install the SPSR Board back into the treadmill.
22.
After replacing the SPSR Board, Perform
Belt Speed Calibration Procedure
Control Board Screw
Control Board Nut
Control Board Bracket
Nylon Screw & Standoff
