X-FI Op Amp and Cap Modification eSnips Folder

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X-FI Op Amp and Cap Modification eSnips Folder

X-FI Op Amp and Cap Modification

- NJM4556 replaced with National Semiconductor LME49860 - Jamicon 220uf @ 16vdc replaced with Panasonic FK series 1500uf @ 16vdc

bichi

Web Address: http://www.esnips.com/web/X-FIOpAmpandCapModification

Updated on Sep. 6 2009

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X-FI-MOD-000b.jpg

National Semiconductor - LME49860 - showing relative size

By bichi on Aug. 25 2007

Size: 147.2kb

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X-FI-MOD-001b.jpg

TOOLS: - fine tweezers - eye loupe - bright flashlight - small tipped side cutters - small tipped soldering iron (Hakko 494 - 25watt) - desolder tool (Hakko 808) - solder paste (syringe)

By bichi on Aug. 25 2007

Size: 254.7kb

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X-FI-MOD-002b.jpg

Original NJM4556 removed: - clipping leads - heating remaining lead on pad and lift away with tweezers - (optionally, use desolder tool to suck leftover leads and excess solder) - clean area with denatured alcohol, acetone or flux remover

By bichi on Sep. 4 2007

Size: 437.2kb

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X-FI-MOD-003b.jpg

Pads cleaned and ready for LME49860 - very small "dot" of solder paste to each pad - place LME49860 with proper alignment - clean soldering iron tip with wet sponge - hold part with tweezer (simple pressure on top) - "quickly" touch one pad/lead area (about 1 sec) - (solder paste goes molten quickly) - examine for correct position - touch rest of pads to complete soldering

By bichi on Aug. 25 2007

Size: 462.2kb

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X-FI-MOD-003bc.jpg

Alternate Method: - place small amount on each pin - carefully position on cleaned pads - wipe soldering iron tip - "touch" one pin/pad (~1 sec) - if still in correct position, continue "touching" remaining pins/pads

By bichi on Sep. 4 2007

Size: 268.8kb

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X-FI-MOD-004b.jpg

Final: - check each joint with eye-loupe and flashlight - clean soldered area with "Q-TIP," moistened with denatured alcohol, acetone or other flux cleaner

By bichi on Aug. 25 2007

Size: 358.4kb

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X-FI-MOD-005b.jpg

Panasonic; FK series; low ESR, 105c, SMT, 1500uf @ 16vdc - (part on hand at closest size)

By bichi on Aug. 25 2007

Size: 167.9kb

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X-FI-MOD-006b.jpg

SMT leads bent up - 24ga wire soldered (red = positive) - heatshrink added

By bichi on Aug. 25 2007

Size: 202.7kb

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X-FI-MOD-007b.jpg

Original Jamicon 220uf @ 16vdc removed - required preheat with soldering iron before using desolder - large thermal mass (ground plane) on X-FI PCB - gray double-sided stick tape used to mount new capacitor

By bichi on Aug. 25 2007

Size: 228.2kb

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