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TR-707 ROM Expansion
This kit includes:
1x
Pre-assembled PCB
1x
10-way ribbon cable with IDC plug
1x
28-way turned-pin IC socket
www.hkadesign.org.uk
You will need:
-
Fine tipped soldering iron & lead solder
-
De-soldering pump or braid
-
Phillips head screwdriver
-
Wire strippers
hka design
Installation Instructions
April 2022
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Table of Contents
Related Manuals for HKA TR-707
Summary of Contents for HKA TR-707
- Page 1 TR-707 ROM Expansion Installation Instructions This kit includes: You will need: Pre-assembled PCB Fine tipped soldering iron & lead solder 10-way ribbon cable with IDC plug De-soldering pump or braid 28-way turned-pin IC socket Phillips head screwdriver Wire strippers www.hkadesign.org.uk...
- Page 2 The printed circuit boards in the TR-707 are not as robust as modern ones and cannot take much abuse. Overheating solder joints can very easily cause tracks and pads to lift, requiring time- consuming rework to put right.
- Page 3 IC33 IC36 Front right-hand corner of TR-707 main board Plug the expansion board into the socket, ensuring that the pins are lined up correctly. You will probably need to adjust the two flat cables going to the mixer board to make room - the left-hand cable marked ‘F201’...
- Page 4 20cm total length. As with the others, these should be fanned out to 3cm, stripped to 2mm and tinned. Fan out to 3cm 30cm (as supplied) Cut to 20cm Fan out to 3cm Separate from wires 1-8 Stripe Drawing not to scale! TR-707 ROM Expansion Page 4...
- Page 5 CN302-18 Data bus bit 4 CN302-19 Data bus bit 5 CN302-20 Data bus bit 6 CN302-21 Data bus bit 7 IC303-1 Row select 1 (step keys 1-8) IC303-13 Row select 3 (row with ENTER key) TR-707 ROM Expansion Page 5...
- Page 6 When powering up the machine for the first time after replacing the batteries, the pattern memory will be scrambled and the machine may behave strangely until you do a factory reset. To do so, power on the TR-707 while holding down the TRACK and PATTERN GROUP A buttons.
- Page 7 The ROM Expansion kit will replace all of the sounds, except for the last two: crash + ride on the TR-707, quijada and star chime on the TR-727. These are stored on separate ROMs and accessed with their own circuitry. A separate add-on board, which is in development, would allow these to be switched with the rest of the sounds.
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