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Korg BX-3 (Gen 2) SupportDigital Korg BX-3 circa 2000

This is Korg’s second generation of the dual-manual BX-3 organ. Unlike its predecessor, this BX-3 is digital and has far more capabilities. It is distinguishable from the first-generation BX-3 because its drawbars are across the top of the upper manual. This keyboard is known by several aliases, digital BX-3, BX-3 v2, and BX-3.2.

Visit our Facebook group for announcements, discussions, and more information about supporting the Korg BX-3.

We put a lot of time into organizing the information here, especially the DYI resources. If the information here was helpful to you, please consider making a donation to help us continue making content like this available.


Parts

You may purchase many replacement parts for your BX-3. At this time, we do not have mechanical parts such as knobs and keys.

KLM-2090 (Power Supply) Electrolytic Capacitor Kit

This kit contains all 8 aluminum electrolytic capacitors for the power supply. The kit comes with a color-coded circuit board layout and color-coded bags of capacitors. If you’re an average electronics DYIer, you can install this kit. Every capacitor meets or exceeds the original factory specifications.

We do not recommend replacing the KLM-2090 electrolytic capacitors unless you know there is a problem with one or more of them. The KLM-2090 is built with long life capacitors, rated from 3,000 to 6,000 hours at 105°C. For the layperson, this translates to 60 to 120 years at 8 hours a day at temperatures under 45°C (113°F). Frankly, other components are likely to fail first. Aside from failures or storage of the organ for prolonged periods at high temperatures, these capacitors should not wear out.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Electrolytic Capacitor Kit, Korg KLM-2090 Circuit Board92-9000150010 day lead time$41.00

KLM-2168 Phone Jack Kit

Contains five replacement ¼" (6.35mm) jacks for the KLM-2168 board. If you’re an average electronics DYIer, you can install this kit. Here’s an interesting piece of trivia about these jacks – in 2016, the manufacturer switched from silver plating to tin plating to reduce costs. By the way, manufacturers of similar products had already done this. The silver oxidation is probably why so many phone jacks look so bad. We recommend replacing the jacks as a last resort after all other rehabilitation efforts such as cleaning have failed.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Phone Jack Kit, Korg KLM-2168 Circuit Board92-900017001 in stock, more with 10 day lead time$23.00

Korg Digital BX-3/CX-3 Tact Switch Kit

If some of the button switches operate erratically or not at all, you can replace them with this kit which contains 34 brand new tact switches for the BX-3. Our tact switches are rated at 10 times the number of operations as the originals. If you’re an average electronics DYIer, you can install this kit. This kit contains one extra tact switch because the BX-3 only uses 33 of them.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Tact Switch Kit, Korg BX-3/CX-3, Gen 292-9000180010 day lead time$18.00

Korg BX-3/CX-3 Firmware Flash Chips

Contains two flash chips programmed with the latest available firmware from Korg. The firmware chips are programmed after you order them and have not been sitting on a shelf for years degrading. They come dried in a moisture-resistant bag with desiccant and an indicator card per J-STD-033B, ready for installation using any reflow technique. This is an advanced skill level job, requiring desoldering and replacing two 44-pin SOIC parts. When we perform this repair, we use a special nozzle for SOIC-44 with our hot air station to remove the old chips.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Firmware Kit, Korg KLM-2168 Circuit Board92-9000190010 day lead time$52.00

Important information for Customers outside the US: If you choose to ship via Economy, Parastream can only guarantee that your shipment arrives at the point of entry into your country. The tracking number may not provide status once it reaches your country. Parastream will not be able to offer any assistance in tracking your shipment once it reaches your country. If you require complete end-to-end tracking and delivery guarantees, you should choose Standard International or International Economy. More information...


Repair Services

Standard repair services are for the circuit boards inside the organ. Check out our videos to see how easy it is. If you need the whole organ serviced, you will need to arrange it with a repair technician using the Support request form. The following services are for individual circuit boards inside the BX-3, and include return shipping. If your organ doesn’t power on at all and has a blank display, it's probably the power supply. Most other problems are usually in the main board. If you’re not certain what’s wrong, use the Support request form and we will help you.

Once you make your service purchases, you will receive an email from Parastream with a service authorization number and a list of items for you to ship to us, and our shipping address. Be sure to include the service authorization number on your shipping box. Check the videos for help with disassembly and packing. Do not ship us your circuit boards without a service authorization number. When your shipping box arrives, you will receive an email with an estimated starting date for your job. Repair services are performed in the order in which your shipping box arrives.

If you are purchasing parts or other items along with repair services, they will be shipped in the same box with the circuit boards when the repair services are complete. This is done to minimize shipping charges. If you would like the parts to be shipped to you separately, place them on a separate order.

KLM-2090 (Power Supply)

Begin by purchasing the Korg KLM-2090 Circuit Board Repair (07-01000000). This gets your power supply into our shop and back to you when it is completed. Unless you are absolutely certain of which repairs are needed (and you also make those additional service purchases), we recommend adding the Korg KLM-2090 Circuit Board Evaluation (07-01000100) which covers initial checkout and report, as well as final testing of any repairs. Without it, we will make our best repair efforts and return the power supply to you untested.

After we receive your power supply and perform the initial evaluation (assuming you purchased the Korg KLM-2090 Circuit Board Evaluation service), you’ll receive an estimate for any additional items needed for repair. You may

  1. accept the estimate and pay.
  2. return the estimate indicating which items in the estimate you want us to perform.
  3. reject the estimate and we will return your power supply with only the repair services you originally purchased.

We do not recommend purchasing the Korg KLM-2090 Circuit Board Electrolytic Capacitor Replacement (07-01000200) unless you know there is a problem with one or more of the electrolytic capacitors. The KLM-2090 is built with long life capacitors, rated from 3,000 to 6,000 hours at 105°C. For the layperson, this translates to 60 to 120 years at 8 hours a day at temperatures under 45°C (113°F). Frankly, other components are likely to fail first. Aside from failures or storage of the organ for prolonged periods at high temperatures, these capacitors should not wear out.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Korg KLM-2090 Circuit Board Repair 07-01000000Available$15.00
Korg KLM-2090 Circuit Board Evaluation07-01000100Available$21.25
Korg KLM-2090 Circuit Board Electrolytic Capacitor Replacement 07-01000200Available$55.81

KLM-2168 (Main Board)

Begin by purchasing the Korg KLM-2168 Circuit Board Repair (07-01000300). This gets your main board into our shop and then back to you when it is completed. Unless you are absolutely certain of which repairs are needed (and you also make those additional service purchases), we recommend adding the Korg KLM-2168 Circuit Board Evaluation (07-01000400) which covers the initial checkout and report, as well as final testing of any repairs. Without it, we will make our best repair efforts and return the main board to you untested.

Add any additional services listed below if you are certain you want them.

After we receive your main board and perform the initial evaluation (assuming you purchased the Korg KLM-2168 Circuit Board Evaluation service), you’ll receive an estimate for any additional items needed for repair. You may

  1. accept the estimate and pay.
  2. return the estimate indicating which items in the estimate you want us to perform.
  3. reject the estimate and we will return your main board with only the repair services you originally purchased.
DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Korg KLM-2168 Circuit Board Repair07-01000300Available$15.00
Korg KLM-2168 Circuit Board Evaluation07-01000400Available$42.50
Korg KLM-2168 Circuit Board Hardware Upgrade to V2 07-01000600Available$22.52
Korg KLM-2168 Circuit Board TG DSP (DSPB56362) Replacement 07-01000800Available$190.00
Korg KLM-2168 Circuit Board Phone Jack Replacement 07-01001200Available$57.32

KLM-2169 (Center Top Panel)

Replaces all the tact switches around the display. This gets your center top panel into our shop and then back to you when it is finished.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Korg KLM-2169 Circuit Board Tact Switch Replacement 07-01001300Available$36.07

KLM-2170 and KLM-2171 (Right and Left Top Panels)

Replaces the tact switches around the Vibrato/Chorus and Percussion areas. This gets your right and left top panels into our shop and then back to you when it is finished.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Korg KLM-2170/2171 Circuit Board Tact Switch Replacement 07-01001400Available$24.03

KLM-2310 and KLM-2311 (Left Upper and Lower Panels)

Replaces all the tact switches left of the upper and lower manuals. This gets your left upper and lower panels into our shop and then back to you when it is finished.

DescriptionPart NumberAvailabilityUnit Price (USD)Ordering
Korg KLM-2310/2311 Circuit Board Tact Switch Replacement 07-01001600Available$31.53

Services not described here may be available on an add-on or time and materials basis. Use the Support request form to inquire.


Videos

  • s01e001: How to remove the power supply from a Korg CX-3 Gen 2 (the process is very similar on a BX-3 Gen 2)
  • s01e002: How to remove the main board from a Korg CX-3 Gen 2 (the process is very similar on a BX-3 Gen 2)
  • s01e004: How to replace the power supply from a Korg CX 3 Gen 2 (the process is very similar on a BX-3 Gen 2)
  • s01e005: How to replace the main board from a Korg CX-3 Gen 2 (the process is very similar on a BX-3 Gen 2)

Check out our YouTube channel for more videos!


DYI Resources

If the information here was helpful to you, please consider making a donation to help us continue making content like this available.

DYI Repairs

If you have good soldering and desoldering tools and skills, you may want to consider doing some repairs yourself and save labor cost and time.

Replacing Tact Switches

Are some of the panel buttons not working reliably? Do you have to press them repeatedly to get them to work? You might want to consider replacing the tact switches. There are 33 of them in the BX-3. These tact switches are susceptible to dust, smoke, and other contaminants. You may purchase a kit of these tact switches from us here, or from another supplier. Our tact switches are rated at 10 times the number of press and release cycles as the originals.

All the tact switches are through-hole mounted on one-sided printed circuit boards. The only trick with installing the new ones is to make sure they are soldered completely flush to the circuit board. You may find some helpful videos here.

While this will take a while to disassemble the organ, replace the switches, and reassemble the organ, it will make it operate like new. To prolong the life of your new switches, we recommend keeping the organ under a dust cover when not in use.

Replacing Phone Jacks

The ¼-inch phone jacks can get corroded or worn out. If you are experiencing scratchy or intermittent operation plugging in cords into the phone jacks, try cleaning them with DeoxIt first. DO NOT Spray directly into the jacks! Instead, saturate a swab and insert it into the jack. Move the swab in and out a few times and try to reach toward the top of the jacks where the contacts are. If this does not fix the problem, the jacks must be replaced.

You may purchase the jacks from us here, or from another supplier. This operation will require a slightly higher skill level than replacing the tact switches, as the printed circuit board is two-sided. You may find some helpful videos here.

Replacing the Firmware Chips

While this is not a common repair, replacing the firmware chips may be necessary if you have determined that the firmware has degraded due to “bit rot” or other problems preventing the organ from booting.

You may purchase the set of firmware chips from us here. The firmware chips are programmed after you order them and have not been sitting on a shelf for years degrading. They come dried in a moisture-resistant bag with desiccant and an indicator card per J-STD-033B, ready for installation using any reflow technique. This is an advanced skill level job, requiring desoldering and replacing two 44-pin SOIC parts. When we perform this repair, we use a special nozzle for SOIC-44 with our hot air station to remove the old chips.

Manuals

IC Datasheets

General Information

You may access useful information for debugging and determining what version of the firmware your organ has. Refer to the following table as a guide, and hold down the indicated buttons while switching on the power. Be patient. You have to hold the buttons down until the desired information displays.

PROGRAM 1 and PROGRAM 8
Displays the low-level firmware version. It is normally displays Ipl V2.00   000422AB
PROGRAM 2 and PROGRAM 7
Perform a factory reset. Displays Load Factory Data?  , Press the WRITE/ENTER button to completely refresh the unit to factory condition.
PROGRAM 4 and PROGRAM 6
Enter the Test Mode. See Test Mode for details.
DISPLAY
Displays the master and subsystem CPU firmware version. The last versions are Main 2.01 Sub 1.00  .

Test Mode

The test mode begins by testing the internal components of the organ, and then moving into interactive tests of the keys, buttons, and lights. If you have a MIDI cable, connect it from the IN jack to the OUT jack for the MIDI loop test. If you don’t have a cable, you can skip the test when it reports an error.

During test mode, use the following percussion buttons to navigate:

ON Go to the previous item marked with a ✔.
SOFT Go to the next item marked with a ✔.
FAST Go to the previous step.
3rd Go to the next step, or skip an internal test error

The following table shows the test steps.

Item Display Description
  Main 2.01 Sub 1.00 The main and sub-MPU versions.
Main RAM Test Tests the RAM in the main MPU. Main RAM Test Error  indicates a failure.
  Main ROM Test Tests the firmware in the main MPU (IC18). Main ROM Test Error indicates a failure.
  Flash ROM Test Checks the integrity of the setting in the user flash chip (IC22).
  FPS Com Test Tests the serial communications lines between the main board and the front panel MPU.
Sub Code Test Tests the firmware in the sub-MPU (IC6). Sub Code Test Error  indicates a failure.
Sub RAM Test Tests the DRAM used by the FX DSPs (IC24, IC25). Sub RAM Test  Error  indicates a failure.
DSP Test Preliminary tests for the four DSP chips.
  DSP1 Test Tests the first TG DSP (IC8). DSP1 Test Error      indicates a failure. If IC7 is a 1J21D mask chip, it is recommended to replace it as well because of the history of failure with these chips.
  DSP2 Test Tests the second TG DSP (IC7). DSP2 Test Error      indicates a failure. If IC8 is a 1J21D mask chip, it is recommended to replace it as well because of the history of failure with these chips.
  DSP3 Test Tests the first FX DSP (IC19). DSP3 Test Error      indicates a failure.
  DSP4 Test Tests the second FX DSP (IC20). DSP4 Test Error      indicates a failure.
MIDI Loop Test Tests the MIDI IN and OUT loop-back. Displays MIDI Loop Error      and pauses if there is no MIDI cable between the MIDI IN and OUT jacks, or if there is actually an error. Press SOFT to advance from pause. There is no way to test MIDI THRU.
Switch LED Test Press 3rd to begin switch tests or SOFT to skip. During switch testing, the organ will emit a short tone if the incorrect key is pressed.
████████████████████ Illuminates all display character pixels for examination. In older organs, you may see some burn-in. Press 3rd or SOFT to advance.
    Darkens all display character pixels for examination. Press 3rd to advance.
ExpressTurnRight   0 Turn the EXPRESSION / OVERDRIVE knob full counterclockwise. The displayed value should be 0. Turn the knob full clockwise. The displayed value should increment toward 127. Advances to the next step when turned full clockwise.
  ExpressTurn Left 127 Turn the EXPRESSION / OVERDRIVE knob full counterclockwise. The displayed value should decrement toward 0. Advances to the next step when turned full counterclockwise.
  Treble TurnRight   0 Turn the TREBLE knob full counterclockwise. The displayed value should be 0. Turn the knob clockwise to the center detent. The displayed value should be 64. Turn the knob full clockwise. The displayed value should increment toward 127. Advances to the next step when turned full clockwise.
  Treble Turn Left 127 Turn the TREBLE knob full counterclockwise. The displayed value should decrement toward 0. Advances to the next step when turned full clockwise.
  Bass   TurnRight   0 Turn the BASS knob from full counterclockwise. The displayed value should be 0. Turn the knob clockwise to the center detent. The displayed value should be 64. Turn the knob full clockwise. The displayed value should increment toward 127. Advances to the next step when turned full clockwise.
  Bass   Turn Left 127 Turn the BASS knob full counterclockwise. The displayed value should decrement toward 0. Advances to the next step when turned full clockwise.
  Reverb TurnRight   0 Turn the REVERB OFFSET knob full counterclockwise. The displayed value should be 0. Turn the knob clockwise to the center detent. The displayed value should be 64. Turn the knob full clockwise. The displayed value should increment toward 127. Advances to the next step when turned full clockwise.
  Reverb Turn Left 127 Turn the REVERB OFFSET knob full counterclockwise. The displayed value should decrement toward 0. Advances to the next step when turned full clockwise.
█        <> Drawbar test. For each drawbar from left to right, push it all the way in, then slowly all the way out, while observing the animated display. The animated drawbar should accurately show the drawbar position. Push the drawbar all the way in to advance to the next drawbar.
Encoder Test The display prompt to begin testing the VIBRATO / CHORUS knob. Press 3rd to begin the tests or SOFT to skip.
  Encoder  Turn the knob and observe that the display value ranges from -128 to 127. Press 3rd to advance.
  Encoder Right   0 Turn the knob exactly one revolution clockwise. The display should range from 0 to 15 with a < displayed in the rightmost character position. Press 3rd to advance.
  Encoder Left    0 Turn the knob exactly one revolution counterclockwise. The display should range from 0 to -15 with a < displayed in the rightmost character position. Press 3rd to advance.
Pedal1 Test Setup: Plug a foot switch into PEDAL 1 jack. Plug a generic expression pedal into the PEDAL 2 jack. Plug in a Korg BX-3 expression or equivalent such as a FC7 Volume Pedal into the EXPRESSION PEDAL jack. Press FAST if the display has advanced to Pedal Test 2.

Run through the 6 tests in this item. At the end when the Keyboard Test message is displayed, plug the three cables back into the jacks, but swap PEDAL 1 and PEDAL 2. This will verify that both ASSIGNABLE PEDAL inputs can take an expression or volume pedal, and a foot switch.

Press and hold the switch and observe the value is 127. Release the switch and observe the display has advanced to the next step.
  Pedal2 Test Move the generic expression pedal to its lowest volume position. Rock it forward and then back all the way. Observe the display value is 0. Move the pedal to the loudest position and observe the display is 127. Move it to the lowest volume position to advance to the next step.
  Pedal3 Test Move the expression pedal to its lowest volume position. Rock it forward and then back all the way. Observe the display value is 0. Move the pedal to the loudest position and observe the display is 127. Move it to the lowest volume position to advance to the next step.
  Remove Pedal1 Unplug the cord in the PEDAL 1 jack and observe the display has advanced to the next step.
  Remove Pedal2 Unplug the cord in the PEDAL 2 jack and observe the display has advanced to the next step.
  Remove Pedal3 Unplug the cord in the EXPRESSION PEDAL jack and observe the display has advanced to the next step.
Kbd Up  C7 / C7   7F Press each playing key on the upper manual as indicated by the display. You will have to strike the key with some force to advance to the next key.
  Kbd Lo  C7 / C7   7F Press each playing key on the lower manual as indicated by the display. You will have to strike the key with some force to advance to the next key.
Output Level Test1 1 kHz in the left channel, 415 Hz in the right at 0 dB.
  Output Level Test2 490 Hz in the left channel, 1 kHz in the right at 0 dB.
  Output Level Test3 1 kHz in the left channel, 612 Hz in the right at -6 dB.
  Output Level Test4 550 Hz in the left channel, 1 kHz in the right at -6 dB.
Noise Test 1 ?
  Noise Test 2 ?
  Noise Test 3 ?
  Noise Test 4 ?
Pre Load This is the last prompt of test mode.

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