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Related Manuals for StewMac MXR PHASE 90
Summary of Contents for StewMac MXR PHASE 90
- Page 1 MXR PHASE 90 SCRIPT MOD INSTRUCTIONS...
- Page 2 It’s like getting two pedals in one. If you run into issues with this modification, a StewMac tech advisor is a click or call away: stewmac.com/contactus or 1.800.848.2273 MXR is a registered trademark of Dunlop Manufacturing Inc.
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Page 3: Parts List
[2] 1/8" heat shrink - 2" length [ 1] Mini toggle switch Wire Cutter Hammer & metal #1607 punch or nail 1/4" Drill Bit [ 1] MXR Phase 90 Script #4850 Mod instructions Kester Pocket-Pak Solder #0505 Solder Sucker #0503... - Page 4 CONNECTING THE NEW SWITCH For your new switch to be connected properly, an understanding of tinning and soldering is necessary. TINNING Tinning is an important part of the soldering process as it helps to make stronger solder joints. Tinning a wire is done by heating the wire with a soldering iron and then melting a layer of solder on it.
- Page 5 MORE HELPFUL SOLDERING SOLDERING TIPS AND TRICKS • Keep your soldering tip clean by wiping it often Hold the tip against the connection on a damp sponge. until the connection reaches soldering temperature. This should take just a • Also keep it tinned by few seconds.
- Page 6 DESOLDERING Much like soldering, you run the risk of damaging the circuit board while desoldering. If too much heat is applied to a circuit board the solder pad can pull away from the board, breaking its electrical connection. A solder sucker and solder wick are your best friends when desoldering. Here are a few tips on how to use them: 1.
- Page 7 DISASSEMBLE THE PEDAL Remove the four screws that secure the back of the pedal housing. Pull the knob off of the front of the pedal, unscrew the mounting nuts for the potentiometer and the switch, and unscrew the mounting nuts for the instrument and power jacks on the side panels.
- Page 8 LOCATE R28 ON THE PCB R28 is the resistor just above the output jack. Desolder and lift the leg of R28 that is closest to the edge of the board (pictured). If you are having trouble sufficiently heating the solder, flip the board over and desolder the back of the pad.
- Page 9 INSTALL A WHITE WIRE ON THE SWITCH Cut one 2" section of white wire, strip roughly 1/4" INSTALL A BLACK WIRE ON THE SWITCH of insulation from the end of it, and tin the freshly exposed wire. Wrap the wire through the eyelet of Cut one 2"...
- Page 10 TIPS ON HEAT SHRINKING Heat shrink is used to insulate an electrical connection, like a solder joint, to prevent the connection from shorting. Slide the heat shrink all the way up to the switch, completely covering the solder joint and solder lug. Wave the flame from a lighter or the tip of a soldering iron near the...
- Page 11 INSTALL THE BLACK WIRE Slide another 1" length of heat-shrink over the INSTALL THE WHITE WIRE black wire that you just soldered to the new switch. Solder the free end of the same black wire to the Feed the free end of the white wire through the lifted leg of R28.
- Page 12 DRILL A HOLE FOR THE NEW SWITCH Measure approximately 1-3/8" down from the top of the pedal enclosure and 1/2" over from the side of the enclosure. Mark 1-3/8” this location with a nail or a center punch to help keep your drill bit in place while you start 1/2”...
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Page 13: Final Assembly And Testing
Re-attach the back panel with the four mounting screws. Plug in your guitar and an amp, and take your MXR Phase 90 for a test drive. When the switch is engaged, the pedal should be noticeably warmer and phase 90 less harsh. -
Page 14: Technical Support
StewMac is not responsible for any damage caused by attempting these modifications. 21 N. Shafer St., Athens, OH 45701 800-848-2273 stewmac.com ©2019 StewMac. All rights reserved. • #2217 Updated December 2019...
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