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| rst 5.6 & rct 7.6 service manual 2007_rev1.0
RST5.6 & RCT 7.6 Sears Service Manual 2007
Cut Console Cable Voltage Chart (DC Volts)
B7: Power Voltage (to UCB)
B2: Incline Pot
B3: Incline GND
B5: Digital GND
B4: Digital GND
B6: RPM
B1: Incline VCC
B8: Power Voltage (to UCB)
B9: Speed Command (PWM)
B10: Drive Motor Relay
B11: Incline Down
B12: Incline Up
Ref# Wire Color
Function
Voltage at UCB Voltage at MCB Physical Symptoms
1
2
3
4
5
6
7
8
9
10
11
12
Black
Brown
Red
Orange
Yellow
Green
Blue
Purple
Grey
White
Pink
Light Blue
Incline VCC
Incline Pot
Incline GND
Digital GND
Digital GND
RPM
Power Voltage(to UCB)
Power Voltage(to UCB)
Speed Command
(PWM)
Drive Motor Relay
Incline Down
Incline Up
0.0 vdc
2.5 vdc
2.5 vdc, grounded at
MCB not UCB.
0.0 vdc
0.0 vdc
5.0 vdc
0.0 vdc
0.0 vdc
“0.0 vdc b/f start
0.36vdc aft start
increases as console
speed increased”
“5.0 vdc b/f start
0.0 vdc aft start”
“0.0 vdc b/f start
5.0 vdc if press incline
down”
“0.0 vdc if at 0%
5.0 vdc if not at 0% or
at console height”
2.5 vdc
0.0 vdc
0.0 vdc, grounded at
MCB not UCB.
0.0 vdc
0.0 vdc
0.0 vdc
17 vdc
17 vdc
“0.8 vdc b/f start
0.7 vdc aft start no
change as console
speed increased”
“1.4 vdc b/f start
1.4 vdc aft start”
0.0 vdc
0.0 vdc
After Start pressed constant down incline.
After Start pressed constant down incline.
Constant up incline. In Hardware Test, motor moves up and down.
Incline value started low and went down to 0 but not up past 10.
Value changes very slowly.
If one removed, no issues. If both removed: UCB does not turn on.
Everything works in normal mode but the console does not register a
speed in Hardware Test or Auto Calibration
If one removed, no issues. If both removed: UCB does not turn on.
At UCB green measures 0.46 vdc, white 1.4 vdc, all others 0.0 vdc.
No belt movement, MCB relay clicks. When measuring MCB voltage,
there is a slight belt movement, then stops
No belt movement, no click from MCB relay.
Up incline functions, no down incline. If incline then decline, motor
does not move again until past incline point. Ex. If incline to 2.0
% then back down to 0%, the motor will not move until 2.5 %. In
Hardware Test, on;ly up incline, value increases, does not decrease.
Down incline functions, no up incline. In Hardware Test, down incline
functions until value at 0, no up incline. Similar phenomenon to
cut Pink wire if incline stopped not at 0%.
Note: All voltages taken after individual wire cut
