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Quinton Q55 - Page 45

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-
UNPLUG
TREADMILL
AND
REMOVE
HANDRA
I
LAND
HOOO.
INSPECT
GRADE
POTENTIOMETER.
RESTORE
POWER
TO
TREADMILL.
TAKE
SPEED
TO
MINIMUM
AND
VARY
GRADE
AS
NEEDED
TO
MEASURE
CURRENT
AND
VOLTAGES
USING
A
MULTIMETER,
MEASURE
CURRENT
OUTPUT
AT
PIN
10
OF
2AIPI!
OR
COLLECTOR
OF
2AIQI
I
MILLIAMPERE
SHOULD
EQUAL
A
2%
INCREASE
IN
GRADE.
NO
WARNING:
Do
not wear loose
clothing
around
rotating
machinery.
High
voltage
is
present
when
treadmill
cab1e
is
plugged
in.
TIGHTEN
NYLON
SETSCREW.
WARNING:
Do
not
wear loose
clothing
around
rotating
machinery.
High
voltage
Is
present
when
treadmill
cable
is
plugged
in.
YES
TREADMILL
CONTROLLER
IS
NOT
">_
.....
RECEIVING
GRADE
FEEDBACK.
TREAOMILL
CONTROLLER
OR
CONTROL
CABLE
I S
AT
FAULT.
CHECK
TP6
FOR
VARIABLE
DC
VOLTAGE.
CHECK
PIN
3
OF
2AIPS
OR
BOTTOM
OF
2AIRZ8
FOR
VARIABLE
VOLTAGE.
YES
GRADE
CURRENT
SOURCE
CIRCUIT
>--:lII--ION
PCB
IS
DEFECTIVE.
REPLACE
PCB
(SECTION
5.2.1.8).
MEASURE
VOLTAGE
CHANGE
VS.
GRADE
CHANGE
AT
WIPER
OF
POT.
CHECK
2AIP8,
PIN
4
FOR
12
VDC
.!,5%.
CHECK
PIN
5
OF
2AIP8
OR
LEFT
SIDE
OF
2AIR8
FOR
9.5
VDC
.!,5%.
A
GROUND
LEAD
IS
OPEN
OR
A
RESISTOR
IS
BAD.
YES
NO
NO
REPLACE
PCB
(SECTION
5.2.1.8).
BAD
WIRE
FROM
2AIP8
TO
WIPER
OF
POT
OR
BAD
CONNECTOR.
BAD
WIRE
FROM
2AlP8,
PIN
4
TO
GRADE
POT
OR
BAD
CONNECTOR.
REPLACE'
GRADE
POT
(SECTION
5.2.1.
7).
4-21

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