HQ Infinity Service Manual
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25. Main Control Board (QM23004)
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CAUTION
: Electronic components can be damaged by electrostatic discharge (ESD). Follow all ESD
precautions in the
Electrostatic Discharge (ESD)
section at the front of the manual while handling
the main control board.
To remove the main control board
1.
Turn the rear power switch off and unplug the power cord.
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CAUTION
: If the power switch in the rear is on and the machine is plugged in, removing the front
distribution board will cause the machine to power on, even though the front power switch may
be turned off.
2.
Remove the right rear panel. (See T
o remove the right rear panel
in the
Rear Plastic Panels
section of
this manual.)
3.
Disconnect all cables plugged into the front distribution board. Be extremely careful to not damage
any of the wires.
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IMPORTANT
: Always try to pull on the plastic connector rather than pull on the wires directly. The
large connectors with multiple wires can be pulled by the wires if you make sure you pinch the
middle portion of those cables so you are pulling on multiple wires at once and not just a couple
of individual wires.
The two cables with black connectors and two
white power connectors shown have latches
that must be pressed fully before the cable can
be removed.
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CAUTION:
Because some of the connectors on the main control board are so close to sensitive
circuitry, do not use a screwdriver to pry connectors loose. The screwdriver may slip and damage
the board.
4 latching
connectors