Roland MKB-300
Released in 1985The MKB-300 is a 76-note MIDI controller with weighted keys.

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We stock both NEW and USED parts; all used electronic parts are tested and guaranteed working.
This listing reflects our current inventory and is updated in real time. If a part is shown as Out of Stock, we typically don't know when or if we might have it again - but click on the part for more info, and then you will be able to sign up for an alert when we do have it available again. By including out of stock parts in our listings, we hope to offer customers a more complete and useful resource.
We cannot diagnose repair issues by phone or email. For technical questions, we suggest posting on our Forums, where our techs - as well as other users - can offer help.

Replacement Keys

AC power socket, 2-blade
$14.95 (Part #4415)
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$14.95 (Part #4415)

Bender assembly, Roland
$49.95 (Part #1474)
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$49.95 (Part #1474)

Bender/modulation panel, Roland
$26.95 (Part #10118)
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$26.95 (Part #10118)

Button, black, Roland
$5.95 (Part #10115)
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$5.95 (Part #10115)

Button, brown, Roland
$5.95 (Part #10116)
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$5.95 (Part #10116)

Button, clear, Roland
$7.95 (Part #1930)
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$7.95 (Part #1930)

CPU board, Roland
$149.95 (Part #10110)
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$149.95 (Part #10110)

Display bezel, Roland
$8.95 (Part #10117)
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$8.95 (Part #10117)

Display board, Roland
$18.95 (Part #10106)
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$18.95 (Part #10106)

Jack board, Roland
$59.95 (Part #10120)
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$59.95 (Part #10120)

Key bushing, rubber
$0.69 (Part #4327)
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$0.69 (Part #4327)

Key contact board, High, Roland
$69.95 (Part #10113)
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$69.95 (Part #10113)

Key contact board, Low, Roland
$29.95 (Part #10108)
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$29.95 (Part #10108)

Key contact board, Mid, Roland
$69.95 (Part #10109)
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$69.95 (Part #10109)

Key return spring, Roland
For white keys
$0.95 (Part #KYSP20)
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For white keys
$0.95 (Part #KYSP20)

Key return spring, Roland
For black keys
$0.95 (Part #KYSP21)
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For black keys
$0.95 (Part #KYSP21)

LED board, Roland
$10.95 (Part #10114)
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$10.95 (Part #10114)

Panel board, left, Roland
$39.95 (Part #10112)
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$39.95 (Part #10112)

Panel board, right, Roland
$39.95 (Part #10111)
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$39.95 (Part #10111)

Phone jack, 1/4-inch, 3-pin PCB mount
For all rear panel jacks
$10.95 (Part #4546)
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For all rear panel jacks
$10.95 (Part #4546)

Power cord, 2-blade
$15.95 (Part #PCJ)
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$15.95 (Part #PCJ)

Power supply board, Roland
$51.95 (Part #10119)
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$51.95 (Part #10119)

Power switch, rocker type
$5.95 (Part #4289)
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$5.95 (Part #4289)

Pushbutton tact switch
$8.95 (Part #3568)
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$8.95 (Part #3568)

Slide potentiometer, 10KB, 20mm
For bender panel sliders
$19.95 (Part #1475)
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For bender panel sliders
$19.95 (Part #1475)

Slide switch cap, Roland
For Protect
$6.95 (Part #2261)
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For Protect
$6.95 (Part #2261)

Slide switch, 12-position
For Transpose
$19.95 (Part #1476)
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For Transpose
$19.95 (Part #1476)

Slider knob, Roland
For bender panel sliders
$6.95 (Part #4293)
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For bender panel sliders
$6.95 (Part #4293)

Style 53W key, black note
$9.95 (Part #K53WBL)
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$9.95 (Part #K53WBL)

Style 53W key, bottom E note
$16.95 (Part #K53WEB)
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$16.95 (Part #K53WEB)

Style 53W key, note A
$10.95 (Part #K53WA)
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$10.95 (Part #K53WA)

Style 53W key, note B
$10.95 (Part #K53WB)
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$10.95 (Part #K53WB)

Style 53W key, note C
$10.95 (Part #K53WC)
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$10.95 (Part #K53WC)

Style 53W key, note D
$10.95 (Part #K53WD)
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$10.95 (Part #K53WD)

Style 53W key, note E
$10.95 (Part #K53WE)
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$10.95 (Part #K53WE)

Style 53W key, note F
$10.95 (Part #K53WF)
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$10.95 (Part #K53WF)

Style 53W key, note G
$10.95 (Part #K53WG)
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$10.95 (Part #K53WG)

Style 53W key, top G note
$16.95 (Part #K53WGT)
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$16.95 (Part #K53WGT)

Transformer, Roland
$47.95 (Part #10107)
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$47.95 (Part #10107)

Transistor, 2SC1815
$2.95 (Part #1943)
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$2.95 (Part #1943)