Panametrics GF868, Руководство по обслуживанию, Страница: 42 / 68

Chapter 4. Parts Replacement
34 DigitalFlow™ GF868 Service Manual (1 and 2-Channel)
4.6 Replacing the LCD Display
The Model GF868’s measurements are displayed on a a two-pane LCD graphic display panel. The LCD display
normally provides years of dependable service, but it is easily field-replaceable when necessary. To replace the LCD
display, see Figure 8 on page 37 for the component locations, and complete the following steps:
1. Remove the printed circuit board, as described in a previous section of this chapter.
2. Using a 3/16 in. nutdriver, remove the four nut/washer sets that secure the display shroud to the inside of the
console cover. Lift the display shroud off its mounting studs.
3. Using a 1/4” nutdriver, remove the four standoffs that secure the LCD display assembly to the console cover. Lift
the LCD display assembly off its mounting studs.
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 9 on page 38.
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 of this
chapter.
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 8 on page 37 and
complete the following steps:
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 9 on page 38). Severe or
repeated bending of these components will break their leads.