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8) PolySix Power Supply Upgrade

This section describes how to upgrade the Korg Polysix power supply. We have had several Polysix units arrive in our workshop with extensive and expensive
internal damage that could only be caused by over voltage being applied to all the integrated circuits on all the boards even though the power supply was still
functioning. The result of this is we now have a mistrust of the design as it stands. This upgrade is optional and will require some tools.

Tools required
Crosshead screwdriver, multimeter
Soldering and desoldering Equipment
Heat Transfer Paste

www.kiwitechnics.com

KiwiSix Upgrade User Manual v3

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Summary of Contents for KiwiSix

Page 1: ......

Page 2: ...uctions 20 1 Rear Panel Install 21 2 KLM 367 Replacement 23 3 KLM 369 Front Panel 24 4 KLM 371 Mods 26 Adjustments for the PolySix 27 5 KLM 368 Adjustments 31 6 PolySix Common Faults 32 7 PolySix Wave...

Page 3: ...metal plate for the power cord This plate has an IEC socket for a standard power cord note Power cord is not supplied screws and space to mount the Korg Serial Number plate and midi in and out sockets...

Page 4: ...KiwiSix Flow Chart...

Page 5: ...KiwiSix Front Panel...

Page 6: ...p 1 Bank Lights A D are normal Grp 2 Bank Lights A D are flashing Tones are selected using a two button system Tones in any one group are numbered 1 1 to 8 8 making 64 tones in each group The first to...

Page 7: ...Clavichord New Wave Organ Jazz Guitar 4 Unison Solo Low Unison Solo High Organ 2 Chime Sound Fall Thin Sound Touch Sound Kim Carnes Sound 5 Brass Ensemble Mellow Brass Oboe Flute Strings Orchestra Sol...

Page 8: ...e it is best to set the chord using middle C as the base note As only one chord can be played at a time the keys played have lowest note priority Changing a chord To change a chord play the new chord...

Page 9: ...ssible the Arp behaviour might not match the Arp switch settings on the panel Changing an Arp switch will set the mode to the switch setting This can then be saved with the tone if desired Clock Divis...

Page 10: ...Poly Flashing Slow 2 Octs Poly Flashing Fast Note if the tape switch is on when the KiwiSix is powered on this will be ignored You will need to switch it off and then on again to edit the Key Transpo...

Page 11: ...just Using the FX Rate Knob Midi Soft Through Filter Shift On Bank D 2 Tone 1 On No Midi Passed Default 2 Tone 2 On All Midi Passed Tone 3 On Pass only non CC Midi Tone 4 On Do not pass KiwiSix CC com...

Page 12: ...note full swing 16 8 Step Tone 6 On 8th note triplets 8 Step Tone 7 On 16th note 6 Step Tone 8 On 16th note 1 2 swing 7 5 Step Tone 1 F On 16th note full swing 8 4 Step Tone 2 F On 16th note triplets...

Page 13: ...for 10 seconds while the restore is being done Program Update The KiwiTechnics KiwiSix Upgrade has built in ability to update the firmware should updates become available This section is entered by p...

Page 14: ...is on Bank C Tone 3 Write This file will dump all the global variables midi channels etc Edit Buffer Dump The current edit buffer can be dumped to midi by using the following keys while shift mode is...

Page 15: ...The patch buttons will select the sequence to play If a sequence is selected while a sequence is playing the currently playing sequence will finish before the new sequence is loaded ARP Button This bu...

Page 16: ...ng The last used Patch will be reloaded on exiting Sequence Edit Mode Any temporary edits made to a Patch will be lost when Sequence Edit Mode is entered You can write the pitch by playing the keyboar...

Page 17: ...n step three Bank 4 Step Forward When the Bank 4 button is pressed while in edit mode the sequence will step forward one position if possible and sound the step If the Seq is positioned on the last st...

Page 18: ...e Internal Clock then the Master Clock tempo will be set by the Poly Six SPEED knob The SPEED Knob will have no effect if the clock source is midi clock If you stop the Sequence part way through and t...

Page 19: ...s set to the Midi Clock the Arp will not play if the midi clock is not present Canceling Arpeggiator Mode Arpeggiator mode can be stopped by pressing the ARP button while not in Seq Mode The ARP butto...

Page 20: ...ffort has been made to make the midi as fast as is possible within the KiwiTechnics KiwiSix upgrade there will always be small delays between the midi input and midi output as the commands need to be...

Page 21: ...by not doing this modification correctly If you are in any doubt at all or do not understand any part of this document then have this work done by a If you are in any doubt at all or do not understand...

Page 22: ...five large screws on the underside front The five screws are in two rows with three located nearest the front edge of the Polysix and two nearer the center The Photo shows the keyboard already remove...

Page 23: ...rth terminal usually the one closest to the transformer The blue wire goes to the terminal marked C Cold or Neutral and the brown wire goes to the terminal marked H Hot or Live Make sure all these wir...

Page 24: ...to b Once all the plugs are removed purple arrows remove the black wire by unsoldering both ends at the red arrows The board can then be unscrewed and removed from the Polysix by removing the four scr...

Page 25: ...visible at either end Damage to the Polysix could occur if plugs are placed incorrectly The Kiwisix Upgrade board should now look like the photo Make sure all the cables are the correct way around an...

Page 26: ...tay connected to this track so cut carefully To make sure you have cut correctly make sure there is no short between pin 7 and pins 2 4 using a DVM e Add the short supplied wire between CN09 Pin 3 pin...

Page 27: ...a jumper in place of R14 on the KLM 371 board a Remove the Arp Rate knob yellow arrow and the nut that is under this on the pot shaft Remove the KLM 371 board by removing the front panel screws marked...

Page 28: ...oscilloscope a small screwdriver and something to measure tuning I can recommend AP Tuner http www aptuner com for windows based computers The Polysix voices are cyclic The same note replayed will ch...

Page 29: ...M check and trim the 15v 5v and 5v power in this order The test points for connecting the DVM are clearly marked on the power supply board To adjust these you will require a small screwdriver The 15v...

Page 30: ...tain ground at TP5 upper left of picture Set the Waveform to PW and PWM to 10 Connect the DVM to the collector of Q5 For each voice adjust VR7 green arrow so that 0v is is measured at the collector of...

Page 31: ...nce to 10 and leave the other settings the same as in step 5 Play any key and adjust VR8 right of VR7 green arrow for a frequency of 523Hz C4 10 Cents Repeat for each voice 8 VCF EG Intensity Adjustme...

Page 32: ...d and you pretty much need to start from a again Get things as close as you can and it will not be possible to get every voice tracking exactly over the full range as each voice has it s own oscillato...

Page 33: ...optocoupler is faulty and should be replaced Another less common failure that effects overall tuning is Q12 which is under a rubber hat This is a 2SC1583 matched transistor pair and can be found at Wa...

Page 34: ...heavy duty ground wires from the Kiwitechnics Power Upgrade board to the following points These need to start from the area of holes on the Power Upgrade board marked GND and with a white box around...

Page 35: ...will combine both the Saw PW waveforms with the PW level controlled by the PW knob With the PW set to full only the Saw remains so it is possible to mix the two waveforms 7 PolySix Hold Pedal Mod Hol...

Page 36: ...be caused by over voltage being applied to all the integrated circuits on all the boards even though the power supply was still functioning The result of this is we now have a mistrust of the design a...

Page 37: ...gloves and clean up carefully after you are finished Step 2 Remove the existing circuit board and mount the upgrade board Remove the four screws holding the transistors to the metal rail and keep thes...

Page 38: ...screws that were removed in step 1 mount the upgrade board into the Polysix Plug in the transformer cable but not the other cables Turn on the Polysix and adjust all the voltages in the order 15v 5v...

Page 39: ...ay Midi Clocks are recognized within the KiwiSix only if the clock source has been set to midi on the Master clock source Modulation O O Midi and internal Modulation are additive within the KiwiSix No...

Page 40: ...nes 0 for tones 1 128 1 for tones 129 256 2 for tones 257 384 3 for tones 385 512 VCO PWM Rate 21 33 00 7f 0 127 Sub Oscillator Switch 22 34 yy yy 00 1f 0 31 Off 20 3f 32 63 1 Oct 40 7f 64 127 2 Oct N...

Page 41: ...tep 50 59 80 89 16th note full swing 8 4 Step 5a 63 90 99 16th note triplets 4 Step 64 6d 100 109 32nd note 3 Step 6e 77 110 119 32nd note triplets 2 Step 78 7f 120 127 64th note triplets 1 Step Seque...

Page 42: ...di Clock f8 248 Midi Timing Clock Start fa 250 Start Arp Sequence Pattern Play Stop fc 252 Stop Arp Sequence Pattern Play Continue fb 251 Continue Arp Sequence Pattern Play www kiwitechnics com KiwiSi...

Page 43: ...60 96 Will increment the current NRPN by one count NRPN Data Decrement 61 97 Will decrement the current NRPN by one count Overall Volume 07 07 0 4096 Sets VCA Level VCO PW PWM 10 16 0 4096 MG Rate 13...

Page 44: ...onse F0 Sysex Start 7F Non Rel time reply xx Midi Channel 0 15 06 Enquiry Message 02 Enquiry Reply 00 21 16 Kiwitechnics Manufacture ID 60 Kiwitechnics ID 02 Product Family ID KiwiSix 00 Product ID xx...

Page 45: ...Transmit Receive Tone Name 0f Request Global Parameter 10 Transmit Receive Global Parameter 11 Request Edit Tone Name 12 Transmit Receive Edit Tone Name 13 Request Sequence Edit Buffer Dump 14 Transmi...

Page 46: ...00x x Off On set On 05 05 Enable MidiCC 00000xxx xxx 000 NRPN CC Off 001 CC In Enabled 010 CC Out Enabled 011 CC I O Enabled 100 NRPN In Enabled 101 CC I O NRPN In Enabled 06 06 Enable Sysex 0000000x...

Page 47: ...1a 26 VCF Cutoff Hi 000xxxxx Hi Lo are combined to make single 12 bit command 000xxxxx 0yyyyyyy 0000xxxx xyyyyyyy 1b 27 VCF Cutoff Lo 0yyyyyyy 1c 28 VCF Res Hi 000xxxxx Hi Lo are combined to make sin...

Page 48: ...000xyz x Chorus set Enabled y Ensemble set Enabled z Phase set Enabled 2d 45 Voice Assign Mode 00000xxx xxx 000 Poly 1 001 Poly 2 011 Unison 1 2e 46 Arp Control 00yyy0zz zz 00 1 Oct 01 2 Oct 10 3 Oct...

Page 49: ...note 6 Clk Step 0111 16th note half swing 7 5 Clk Step 1000 16th note full swing 8 4 Clk Step 1001 16th note triplets 4 Clk Step 1010 32nd note 3 Clk Step 1011 32nd note triplets 2 Clk Step 1100 64th...

Page 50: ...r future expansion 2f 67b 47 1659 Seq Steps 124 x 13 1612 Note 1 0xxxxxxx Note 2 0xxxxxxx Note 3 0xxxxxxx Note 4 0xxxxxxx Note 5 0xxxxxxx Note 6 0xxxxxxx Byte 7 00abcdef Byte 8 0xxxxxxx Byte 9 0xxxxxx...

Page 51: ...ata bytes for all 12 bit returns and 2 bytes with a leading 00 for all others 10 16 Transmit Receive Global Parameter 2 data bytes 00 0 Global Parameter Number 000xxxxx x Data Offset Use Data Position...

Page 52: ...xxxxxx x 0 No Seq Recorded 1 124 No of Seq Steps Seq Step Note 1 0xxxxxxx Note 2 0xxxxxxx Note 3 0xxxxxxx Note 4 0xxxxxxx Note 5 0xxxxxxx Note 6 0xxxxxxx Byte 7 00abcdef Byte 8 0xxxxxxx Byte 9 0xxxxxx...

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