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Page 49
Section 17: Electronic Information - Control Board LEDs
(Continued)
• Replace the remote on/off wire with a QM20204
jumper on the power supply remote on/off
switch connection. This will bypass the remote
power switch and wiring. (Figure 17.20)
• Turn on the machine. If the LEDs are still not
on, then there may be an issue with the power
supply or the control board. If the LEDs both
begin working again, this may indicate that one
of the peripherals or its cabling is shorting out
the control board .
• If a volt meter indicates that 48V is present at the
Control Board power connector and the Control
Board LEDs are off when everything is unplugged
except for power at J6 and the QM20204 jumper
on the power supply, then the Control Board
should be replaced .
• If the LEDs come back on with everything
unplugged but the above two items; begin
plugging the cables back in one at a time
(powering off between the connection of each
cable) until you find the cable or peripheral that
is causing the issue .
The Control Board has four labelled LEDs down
the right edge of the board . These can be seen by
removing the handwheel ,without removing the
machine front cover .
• D23, KEYPRS: Toggles on and off as the take-up
spring passes the thread break sensor.
• D22, OVRSPD: Used by Engineering during testing
/ development.
• D21, NEEDLE: LED is on from when the take-up
lever is at its highest position until the needle is at
bottom dead center. LED is off from needle bottom
dead center until the take-up lever is at its highest
position.
• D20, HEARTBT: Indicates the main Control Board
processor has power and is functioning when it is
beating like a heartbeat.
