Q155 Service Manual
4-7
4.6.
Circuit Board Replacement
Caution
The Printed Circuit Boards (PCBs) contain components that are sensitive to
electrostatic discharge (ESD) and can damage the board if not handled
properly. As when handling any ESD-sensitive PCB, observe standard ESD
safety procedures. These procedures include the following:
n
Handle the PCB by the edges only.
n
Work on a grounded ESD mat.
n
Wear a grounded wrist strap.
n
Store PCBs only in anti-static bags.
4.6.1.
Circuit Board Removal
i.
Set the unit's ON/OFF switch to the OFF position, and unplug the power
cord.
ii.
Remove the cabinet.(See section 4.2.1)
iii.
Disconnect all connectors from the circuit board. (See
iv.
Figure 4-13)
v.
Remove the circuit board from supports. (See
vi.
F
i
g
u
r
e
4-13)
Note
Handle the new circuit board only by the edges to prevent electro static damage
to the unit.
Note
Handle the new circuit board only by the edges to prevent electro static damage
to the unit.
Note
Handle the new circuit board only by the edges to prevent electro static damage
to the unit.