DigitalFlow™ GC868 Service Manual (1 and 2-Channel)
B-4
Appendix B. Optional Enclosures
B.6 Rack Mount LCD
Display
Replacement
The Model GC868 measurements are displayed on a two-pane LCD graphic display
panel. The LCD display normally provides years of dependable service, but it is
field-replaceable when necessary.
To replace the LCD display, refer to Figure B-2 on page B-9 and complete the
following steps:
1.
After disconnecting the main power to the meter, remove the top panel from the
enclosure by removing the four screws indicated.
2. Using a 3/16” nutdriver, remove the four nut/washer sets that secure the display
shroud to the inside of the front panel. Pull 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 front panel. Pull the LCD display assembly off its mounting studs.
4. Place the new display in the enclosure and replace the circuit board connec-
tions of the data and power cables of the old display with those of the new dis-
play. Be sure to orient the new cables in the same way as the old ones, when
making the connections to the printed circuit board. Remove and discard the old
LCD display.
5. Place the new LCD display assembly over the mounting studs on the front panel
and fasten it in place with the four standoffs. Make sure that the LCD display
assembly is oriented with the cables pointing toward the left side (away from
the keypad) of the meter.
6. Position the LCD display cables between the two 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 over the cables to protect them
against abrasion.
7. Fasten the display shroud to the front panel with the four sets of nuts/washers.
8. After checking for any loose hardware that may have fallen into the enclosure,
reinstall the top panel on the meter and secure the panel in place with the four
screws previously removed.
The Model GC868 flowmeter may now be placed back into service. Reconnect the
main power and resume taking measurements.
Note:
Be sure to record the LCD Display replacement in Appendix A,
Service Record
.
WARNING! The main power to the Model GC868 must be
disconnected before proceeding.
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.