Eventide ARGUS 3000 - 7000 Fuse Replacement 49 R

9.3 7000 Fuse Replacement
The ordering part number for the 3-amp pico ruse is #316019.
Soldering skills are required to perform this procedure.
Necessary Tools: Small phillips head screwdriver
Small slot-head screwdriver
Toluene
Solder wick (preferred) or solder sucker
Soldering iron and solder
Small needle-nose pliers
Ohmmeter or battery powered test light (optional)
Expose The Fuse
1. Remove the 10 screws that hold the top panel in place. Remove the top panel to expose the power
supply mother and daughter boards.
2. The daughter board has a pin connector labeled with the number "8." The label "80 khz" is also
near this connector. The fuse on the mother board is situated diagonally below this pin. (Refer to
Figure 12 on page 46.)
3. Gently pull up on the corner of the daughter board near the pin marked "8." This will allow easier
access to the fuse.
Test The Fuse
4. You may wish to test the fuse before replacing it. If a battery powered test light is connected across
the fuse and it lights, the fuse is good. Likewise, if an ohmmeter connected across the fuse reads
less than 0.2 ohm, the fuse is good and should not be replaced.
Remove The Old Fuse
5. To remove the old fuse, you first have to remove the conformal coating around it. If you have
toluene, apply a small amount to the area immediately around the points where the fuse is soldered
to the board. This will soften the conformal and make it easier to scrape away.
6. Using the end of a small slot-head screwdriver, gently scrape away the conformal coating from the
soldered ends of the fuse. Use just enough pressure to remove the coating.
CAUTION
Be careful not to damage any of the traces or pads on the board.
7. Using the small needle nose pliers, grasp the lead at one end of the fuse. Heat the solder joint with
the soldering iron until it melts and the lead can be gently pulled free of the board. Heat the other
solder joint until it melts and gently pull the fuse free of the board.
Argus Maintenance Manual Part #5006 July, 1993 Page 49