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ELECTRICAL TROUBLESHOOTING (Continued)
PROBLEM--Traverse speed control goes at one speed only.
Traverse Drive Control Pin #8 to 7
Pot full CCW Pot Full CW
0 VDC 9.75 VDC
Pin #8 to 9
Pot full CCW Pot Full CW
9.75 VDC 0 VDC
Yes--Pot is OK
No--Go to Step B. next
Check for 10,000 ohms
Red to White wires
Full CCW - 0 ohms
Full CW - 10,000 ohms
Red to Black wires
Full CCW - 10,000 ohms
Full CW - 0 ohms
Yes--Go to Step C. next
No--replace potentiometer.
Wiper inside of potentiometer controls
speed. Wiper may be bad and not making
contact.
Verify potentiomter White wire to terminal 7,
Red wire to terminal 8 and Black wire to
terminal 9, if not, correct.
Check for Proper function.
Yes--end troubleshooting
No--Go to Step D. next
Minimum and maximum pot settings effect
traverse speed.
Checkout Procedure
A. Check potentiometer (Pot) on
control panel.
B. Check potentiometer for 10,000
ohms.
Remove three wires from
Traverse Drive Control
red from term #8
white from term #7
black from term #9
C. Check potentiometer wiring for
proper hookup. See that speed pot
is wired per electrical diagram
D. Check all pot settings on circuit
board as shown in wiring diagram.
(See adjustment section Traverse
Motor Control Board Settings.)
Possible Cause
Defective speed control
potentiometer
Wiring hookup to
potentiometer is
improper.
(If components have
been replaced.)
Main circuit board dial
pot settings not correct.
(If board has not been
replaced.)