StewMac MXR PHASE 90 Instructions Manual Download Page 2

Page: 2 / 14

THIS MOD GIVES

YOU TWO SOUNDS

FROM YOUR STOCK

PHASE 90.

With the flick of a switch

you can have your stock “block” sound and the
coveted vintage “script” sound that you’ve heard on
thousands of recordings. 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.

Summary of Contents for MXR PHASE 90

Page 1: ...MXRPHASE90 SCRIPTMOD INSTRUCTIONS ...

Page 2: ...d and the coveted vintage script sound that you ve heard on thousands of recordings 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 ...

Page 3: ...er 0505 Solder Sucker 0503 Solder Wick 0504 PARTS LIST 1 Black and white pushback wire 2 1 8 heat shrink 2 length 1 Mini toggle switch 1 MXR Phase 90 Script Mod instructions Fine gauge Wire Stripper 1606 Wire Cutter 1607 1 4 Drill Bit 4850 Solomon SR 965 Soldering Station 0501 TOOLS YOU LL NEED ...

Page 4: ... the wire sheathing from the end of the wire you intend to solder 2 Twist the wire strands of the exposed wire firmly Don t twist solid core wires 3 Dab a tiny amount of solder onto the end of your soldering iron 4 Touch the soldering iron with its dab of solder to the exposed wire closest to the sheathing This will help to hold the iron in place as it heats the exposed wire Wire will heat within ...

Page 5: ...ts are messy and more likely to fail SOLDERING 1 Insert tinned wire through lug hole before soldering and bend to secure 2 Melt a small amount of solder onto the tip of the iron tinning the iron 3 Hold the tip against the connection until the connection reaches soldering temperature This should take just a few seconds 4 Feed solder to the connection not to the iron Stop feeding solder once the lug...

Page 6: ...sucker and remove the soldering iron from the joint Inspect the solder joint and repeat the process until all of the solder is removed 2 USING SOLDER WICK Solder wick is a flat braided wire that can be used to remove solder from a joint Simply place the wick on the solder joint and press your soldering iron against the wick heating the joint through the wick The solder will liquefy and absorb into...

Page 7: ...e 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 Gently push the switch and the pot shaft from the front of the enclosure and the board should come right out MXR phase 90 INPUT OUTPUT SPEED 1 1 ...

Page 8: ...ter the solder has been removed from the pad carefully lift the resistor leg from the pad To do this you might need to heat the leg and the pad with your soldering iron Be careful not to break the other leg of the resistor as you are lifting the left one In the next steps you will prepare the switch to attach to the R28 resistor The switch will take the resistor in or out of the circuit letting yo...

Page 9: ... the outside solder lugs on the switch and solder it Even though it s called pushback wire you must strip the insulation to make a solid solder connection INSTALL A BLACK WIRE ON THE SWITCH Cut one 2 black wire strip roughly 1 4 of insulation from the end of the wire and tin the freshly exposed wire Wrap the wire through the eyelet of the middle solder lug on the switch and solder it 3 3 4 4 ...

Page 10: ...1 Heat shrink is used to insulate an electrical connection like a solder joint to prevent the connection from shorting 2 Slide the heat shrink all the way up to the switch completely covering the solder joint and solder lug 3 Wave the flame from a lighter or the tip of a soldering iron near the positioned heat shrink until the wrap constricts to a firm hold Allow heat shrink to cool ...

Page 11: ...lder the free end of the same black wire to the lifted leg of R28 Use a heat source to shrink the insulation over the joint you just soldered INSTALL THE WHITE WIRE Feed the free end of the white wire through the hole vacated by the lifted leg of R28 Solder this wire to the solder pad on the back of the circuit board 6 6 7 7 ...

Page 12: ...he top of the pedal enclosure and 1 2 over from the side of the enclosure Mark this location with a nail or a center punch to help keep your drill bit in place while you start drilling the hole Use a 1 4 drill bit to drill a hole in the pedal enclosure where you just left a mark 8 8 ...

Page 13: ...f the components back into the pedal housing 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 less harsh If you experience intermittent signal or other irregularities pull the back panel off the pedal again and inspect your solder joints MXR phase 90...

Page 14: ...attempting these modifications please don t hesitate to reach out to our Tech Support Team They are available by email at service stewmac com and by phone M F 9 00AM 5 00PM ET at 1 800 848 2273 DISCLAIMER Performing the modifications outlined in these instructions will void any warranty on your pedal StewMac is not responsible for any damage caused by attempting these modifications ...

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