Chapter 4. Parts Replacement
4-5
DigitalFlow™ GC868 Service Manual (1 and 2-Channel)
4.
Place the new LCD display assembly over the mounting studs on the console
cover and fasten it in place with the four standoffs. Make sure that the LCD
display assembly is oriented as shown in Figure 4-2 on page 4-9.
5.
Position the LCD display cables between the two right side mounting studs, and
install the display shroud over the mounting studs. The top and bottom edges of
the shroud are bent at a 90° angle to the main surface, and these edges must
face inwards toward the display assembly.
Note:
One edge of the display shroud is covered with a piece of black electrical
tape. This side of the shroud should be on the right, to protect the cables
against abrasion.
6.
Fasten the display shroud to the console cover with the four sets of
nuts/washers.
Complete the LCD Display replacement by proceeding to the
Installing the Printed
Circuit Board
section on page 4-5.
4.7 Installing the
Printed Circuit
Board
Whether the printed circuit board was removed for replacement or for one of the
other procedures discussed in this chapter, reinstallation of the printed circuit board
is the final step in the process. Refer to Figure 4-1 on page 4-8 and complete the
following steps:
1.
Position the printed circuit board within the electronics console with the top edge
tilted forward. Insert the display ribbon cable and keypad ribbon cable
connectors into their sockets on the rear of the printed circuit board. See Figure
4-1 on page 4-8 and Figure 4-2 on page 4-9 to identify the cables and sockets.
Note that the keypad cable connects to the upper socket and the display cable
connects to the lower socket.
IMPORTANT:
The ribbon cables must be installed with the edges that were marked
during removal oriented toward the top of the printed circuit board.
2.
Carefully position the printed circuit board up against the eight standoffs in the
enclosure. Do not damage the transformers and any installed option cards as
they are maneuvered between the standoffs.
3.
Loosely install the three long standoffs on the right side of the printed circuit
board and the two standoffs (or screws) along the bottom edge of the printed
circuit board.Then, install only the top and bottom short standoffs on the left side
of the printed circuit board.
CAUTION!
Do not overtighten the standoffs or the display
assembly may be damaged.
CAUTION!
Do not overtighten the nuts or damage to the mounting
threads may occur.
CAUTION!
During this procedure, be very careful not to damage
the vertical components along the top edge of the
printed circuit board (see Figure 4-2 on page 4-9).
Severe or repeated bending of these components will
break their leads.