Partner Tech International PT-6900, Service Manual, Page: 68 / 106

58 Replacing Field Replaceable Units (FRUs)
Before you begin
Make sure you have a stable, clean working environment. Dust and dirt can get into the PT-6900 components and may
cause malfunction. Adequate lighting and proper tools can prevent you from accidentally damaging the internal com-
ponents.
Most of the electrical and mechanical connections can be disconnected by using your fingers. It is recommended that
you do not use needle-nosed pliers to disconnect connectors as these can damage the soft metal or plastic parts of the
connectors.
Replacing Parts
Take note of the following when replacing parts:
• If you replace an FRU and the symptom remains, reinstall the original FRU before going to the next step. Do
not replace non-defective FRUs.
• When replacing a malfunctioning component, other parts that have to be removed before the failing part are
listed at the top of the page.
• The arrows in the following procedures show the direction of movement to remove/replace a part, or to turn a
screw or key to release a device.
• Always use the correct screw size as indicated in the procedures.
• Always use new screws.
• To replace a part, reverse the removal procedure.
CAUTION
If the LCD breaks and fluid gets onto your hands or into your eyes, immediately
wash with water and seek medical attention.
CAUTION
Under no circumstances touch the inverter card while power is connected to the
PT-6900. Unplug the power cord before attempting to replace any FRU.
CAUTION
To prevent static damage to components, wear a grounded wrist strap. Alterna-
tively, discharge any static electricity by touching the bare metal chassis of the
unit case, or the bare metal body of any other grounded appliance.
CAUTION
Hold electronic circuit boards by the edges only. Do not touch the components
on the board unless it is necessary to do so. Do not flex or stress the circuit
board. Do not hold components such as a processor by its pins; hold it by the
edges.
CAUTION
To prevent scratching the case of the PT-6900, make sure the worktop surface is
clean and flat. If you need to put the display facing down, be sure to use a foam
mat.