GE DigitalFlow DF968, Service Manual

Page: 45 / 78

March 2008
4-2 Parts Replacement
Fuse Replacement
If it has been determined that the fuse in the Model DF868 requires
replacement, complete the following steps:
!WARNING!
The main power to the Model DF868 must be
disconnected before proceeding.
1. Open the cover on the electronics console. For LVD compliant
units, remove the two mounting screws and lift the clear plastic
shroud out of the electronics console.
2. Locate the black plastic fuse holder that is mounted on the printed
circuit board between the power terminal block (
TB1
) and the
RS232
terminal block. As shown in Figure 4-1 on page 4-10, the
fuse holder extends below the main aluminum shroud, and the
fuse holder cap is located on the bottom of the fuse holder.
3. Using a small standard screwdriver, turn the fuse holder cap
counterclockwise about 1/4 turn. The fuse holder cap, with the
captive fuse, will be ejected from the fuse holder.
4. Replace the defective fuse with a new one of the same rating and
type. Use only 1-1/4” x 1/4” Slo-Blo fuses, having a rating as
indicated in Table 4-1 below and on the wiring diagram label.
5. Press the new fuse into the fuse holder cap and insert the fuse into
the fuse holder. While applying a slight pressure with the
screwdriver, twist the fuse holder cap 1/4” turn clockwise.
6. For LVD compliant units, place the clear plastic shroud over the
standoffs in the electronics console and secure it in place with its
two mounting screws. Close the cover on the electronics console.
The Model DF868 flowmeter may now be placed back into service.
Reconnect the main power and resume taking measurements.
Note:
Be sure to record the fuse replacement in Appendix A, Service
Record .
Table 4-1: Line Voltages & Fuse Ratings
Line Voltage Fuse Rating
100-120 VAC 1.0 A, Slo-Blo
220-240 VAC 0.5 A, Slo-Blo
12-28 VDC 3.0 A, Slo-Blo