True Fitness 455 Pediatric, Service Manual

TEST PROCEDURES

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GROUNDED OUTLET TEST 

This test is very important for optimal HRC and incline operation. 
 
 

Set voltmeter for Volts AC 

Place 1 lead in the right side of the outlet (hot) 
Place 1 lead in the ground plug 
A properly grounded outlet will read 110 VAC 

AMP DRAW TEST 

This test is a good indicator of the wear condition of the belt and deck, and the need for lubrication. 
The treadmill circuit breaker will trip at 15 amps, so be sure the voltmeter you are using is rated for at least 
15 amps when you are load testing the treadmill.  This test can be performed either on one of the AC power 
cord leads or on one of the DC motor leads from the PWM to the motor.  Testing the amp draw at certain 
speeds without load and with load will signal whether higher than normal amp draw is a result of PWM 
failure or increased friction from belt and deck wear. 
 

AC AMP DRAW PROCEDURE 

This procedure requires an AC clamp-on ammeter.  Place the clamp around either of the power cord 
leads, black or white.  Load test requires a person to walk on the tread belt for 5-10 minutes. 
 
 

2.5 mph w/out load   

2.0-2.5 AMPS AC 

2.5 mph with load 

2.75-3.75 AMPS AC 

4.0 mph w/out load   

3.5-4.0 AMPS AC 

4.0 mph with load 

5.0-7.0 AMPS AC 

DC AMP DRAW PROCEDURE 

This procedure can be performed with an ordinary voltmeter.  

(Note: Be sure the voltmeter is rated 

to handle 15 DC amps.)  

Disconnect the red motor lead from MTR1 on the PWM.  Connect the 

voltmeter to MTR 1 on the PWM and the other voltmeter lead to the red motor lead so that the 
voltmeter completes the connection of the PWM to the motor. 
 
 2.5 

mph 

w/out 

load 

   4.5-5.0 

AMPS 

DC 

 2.5 

mph 

with 

load 

   7.0-8.0 

AMPS 

DC 

 
 4.0 

mph 

w/out 

load 

   5.0-5.5 

AMPS 

DC 

 4.0 

mph 

with 

load 

   8.5-9.0 

AMPS 

DC 

 
Higher than normal amp draws without load may signal that belt tension is too tight or there is a 
problem in the Drive Motor or PWM.  Perform the Drive Motor Test and visually check the motor 
brushes before replacing the PWM.  Higher than normal amp draws with load after normal readings 
without load signal belt and deck friction which may require lubrication or replacement. 
 

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