
SECTION IV
TEST MODE
A. BUILT-INTEST PROGRAM
A test program is available to test the major functions for proper operation. To access the pro-
gram press the and buttons simultaneously.
The display will read “SYSTEM TEST“ briefly then "PRESS "SET" !!", after which the following
maybe tested:
1.TREADLE
2.EYEANDINDEXSIGNAL
3.ENCODER
4.MOTORBALANCE
1. Treadle Test
Pressthe button until "TEST TREADLE" will be displayed briefly then " NEUTRAL".
a. Move the pedal from neutral to heel 1 then to heel 2.
The display should show each position.
b. Move the pedal forward slowly. As the pedal is moved, a number (0 to 255) will be displayed.
NOTE: This number is proportional to how far the pedal is moved. The lowest number
should be no more than "8" and the highest number greater than "250".
2. Setting the Index Signal
a. Remove the drive belt.
b. Press the button. The display will read "TEST INDEX" briefly then show a broken line
"-----------". If the eye is uncovered the display will show "------Eye------". Rotate the motor by
hand until the display shows "Index-Eye". Rotate the machine by hand until the needle point is
approximately level with the throat plate on it's downward stroke. replace the belt and tighten
with the machine and motor in this position.
3. Encoder Test
CAUTION: Remove the sewing machine belt. The belt has to be removed because the
motor may not develop sufficient torque to turn the machine.
Pressthe button. The display will read "TEST ENCODER" briefly then "PUSH START
(enc)". Press the button the motor will begin to rotate slowly and the display will read
"PLEASE WAIT !!". After 2 or 3 seconds the motor will stop and the display shows the number
of counts. The number should be between 240 and 260 pls.
4-1
ML990-9