Kurzweil 1000 Expanders
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A support site for Kurzweil 1000 series music keyboards and expanders
K1000 keyboard


This flyer was distributed by Kurzweil to the Tech industry for performing the upgrades. 

Kurzweil 1000 PX
PXA Sound Block
Installation Procedure
Kurzweil Music Systems, Inc
411 Waverly Oaks Road
Waltham, MA 02154
(617) 893-5900
KMSI P/N 91013901, Rev B

Static-Sensitive Handling Procedure * 

Read this procedure before installing any component.

  • Do not remove the IC(s) from the conductive protective packaging until you are ready to install the Kurzweil option or upgrade. Remove one IC at a time during installation
  • Remove the AC power cord for the Kurzweil keyboard or rack-mount unit from the wall outlet.
  • Lay a sheet of aluminum foil on top of the Kurzweil keyboard or rack-mount unit.
  • Put the conductive packaging containing the IC’s on the aluminum foil.

It may be necessary to squeeze the IC pins closer together to facilitate their insertion. During this procedure, keep one hand on the aluminum foil at all times. Roll the IC onto its side on the sheet of aluminum foil so all the pins are in contact with the foil. Carefully bend all the IC pins slightly, then turn the IC on it’s other side and repeat. Be careful not to bend the IC pins excessively. A small amount of adjustment is all that is usually required.

When it is time to install the ICs, place one hand in contact with the chassis of the Kurzweil keyboard or rack-mound unit before picking up the IC to be installed. 

Keep one hand in contact with the chassis of the Kurzweil keyboard or rack mount unit until the IC is completely installed in it’s appropriate socket.

Repeat the procedure until all ICs have been properly installed. After an IC is installed into it’s socket, it’s susceptibility to damage due to static discharge is greatly reduced. It is not necessary to see the static discharge for it to damage the ICs. Following the above procedure will greatly reduce the possibility of damaging the parts you have received. Failure to follow the appropriate static-sensitive handling procedure may completely destroy the ICs. IC’s damaged by static discharge do not necessarily fail immediately. Premature failure may occur after an extended period of time. Please follow this procedure to ensure that you will have not static discharge-induced problems with your new Kurzweil option or upgrade. 

Parts List

[This list varied with upgrade undertaken and doesn’t apply to the Kurzweil Users Group. We will be making the upgrade to full Pro Series and no intermediate stops are needed.] 

Upgrade Procedure:

The following describes the necessary steps to install the 1000 PX & PXA sound block. Please refer to the Static Sensitive Handling Procedure before beginning.

Although user programs are stored in RAM and may not be lost during this installation, user programs should be saved via the Kurzweil Object Mover program. If you do not have the Kurzweil Object Mover program available. Inform the customer prior to performing this installation that you may need to perform a hard reset to the unit if problems occur and that his/her user programs will be erased.

Disassembly Instructions

  1. Turn power off and unplug unit.
  2. Remove the 4 Phillips-head screws from each side of the unit (this includes the rack ears)
  3. Slide top cover back away from control panel BEFORE lifting it off the unit to release it. 

Identify which CPU Board is installed:

Once you have opened the unit, it is necessary to identify which CPU board is currently installed. Currently, there are three versions of the CPU board in the field and can be identified by two different board numbers. Please locate the board number silk screened on the board (board number 33037001 and 33049001). Typically the board number is silk screened in the area near the rear panel.

Once you have located the board number, please follow the instructions that pertain to the particular board you are updating. 

Board number 33037001

This is a four layer board. One cut and one jump is required. Find locations JP03 and JP04. Connect the solder pads inside JP03. Cut the etch inside JP04. 

These jumpers are located next to sockets U21 and U22 at the end towards the front panel. Be careful to identify them correctly because the numbers printed on the board are not nearest the actual jumpers themselves. Best to identify all four actual jumpers which are lined up sequentially, but the numbers are not sequential. 

JP04: when you cut the etch you only need to scratch it with an Exacto-knife until the trace is not longer visible with a magnifier. If testing with a VOM meter the resistance will change from “0” (zero) to about 100K ohms. (It won’t reach infinite resistance because the test points are still in circuit) 

Board number 33049001 (2 versions- find your version) This is a two layer board. There are two versions of this board. 

  • Version 1: Find location JP03 and JP04. If the board you are updating has 2 pins in each location there should be a header on the pins of JP04. Simply move the header to JP03. You are done. Proceed to the instructions “Installing the New Sound ROMS and EPROMS.
  • Version 2: If you are updating the version of this board without pins, one cut and one jump is required. The cut however, needs to be on the solder side of the board. Remove the CPU board by doing the following:
  1. Remove the 5 phillips head screws on the bottom of the front panel. There are 9 phillips head screws on the bottom of the front panel assembly. Remove only the 5 screws that attach the front panel assembly to the chassis. These screws are located where the chassis sheet metal meets the front panel assembly. 
  2. Next remove the 2 phillips head screws at the right and left end on the top of the front panel assembly.
  3. Remove all cables coming from the front panel assembly to the CPU board. You can now set the front panel assembly aside.
  4. Remove the cable coming from the power supply to the CPU board.
  5. Remove the hardware from the rear panel securing the MIDI and output jacks.
  6. Remove the screws that secure the CPU board to the chassis.
  7. You will now be able to remove the CPU board.
  8. Find locations JP04 on the solder side of the board and cut the etch connecting the two solder pads at JP04. 
  9. On either the solder or component side of the board, connect the two solder pads at JP03. 
Installing the New Sound ROMs and EPROM’s

Remove the EPROMS from U21, U22, U32, and U33. Install the new EPROMS.

Install the missing ROMS from the remainder of the U50-U61 sockets. If the socket is empty, make a chip and put it in the socket. Put the correct U-numbered chip in any empty socket with the same U-number. 

You are finished. Time to test it. 

* From the ex-Alzerom site with apporval of David B.