Section TOC
Master TOC
TROUBLESHOOTING AND REPAIR |
SWITCH BOARD AND FILTER CAPACITOR REMOVAL
AND REPLACEMENT (continued)
8.With the slot head screwdriver, remove the two nylon mounting screws at the bottom of the switch board. Note placement of the
9.Using the 3/16 in. Allen wrench, care- fully remove the four cap screws that mount the switch board to the heatsink.
10.Carefully remove the switch board from the heatsink.
11.If the filter capacitor is to be removed, carefully slide it out of the mounting bracket.
REPLACEMENT PROCEDURE
1.If the filter capacitor is to be replaced, carefully slide the new capacitor into the mounting bracket. Position the capacitor so the correct polarity termi- nal is lined up with the correct hole on the switch board.
2.All heatsink and IGBT mounting sur- faces must be clean.
3.Apply a thin coat of thermal compound (Penetrox A13) 0.005 in. to 0.010 in. to the mating surfaces. Do not apply around mounting holes.
4.Apply a thin coat of Penetrox A13 to the capacitor terminals. Be careful not to apply compound to screw threads or threaded area of terminals.
5.Mount the new switch board and tight- en the four cap head screws in the fol- lowing manner.
•Tighten all until snug.
•Tighten all from 24 to 28 in/lbs.
•Tighten all from 40 to 48 in/lbs.
6.Make sure the capacitor is positioned correctly. Connect leads 19+ and 20- to the correct terminals. Tighten to 55 in/lbs.
7.Position and mount the two nylon screws, fiber spacers, and washers. Torque from 4 to 8 in/lbs.
8.Connect leads 11/12 or 15/16 to the correct terminal.
9.Connect leads 13/14 or 17/18 to the correct terminal.
10.Connect the molex plug to the top of the switch board.
11.Install the case top and sides using the 3/8 in. nutdriver.
