When I reached this chapter in the adjustment procedure manual and read the instructions, I thought "wtf, you gotta be kidding me!". A bunch of wires has to be unsoldered from terminals throughout the process, furthermore two jumper wires from one of the KBC boards have to be connected to those terminals, one at a time. And all in all there are 5 TRG Boards, with lots of trimpots...
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| TRG1 Board |
Despite the first shock, adjustments are straight forward, except going back and checking the values again can sometimes cause high blood pressure and lead to do readjusting runs.
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| connected soldering points |
I had two further "WTF" moments. During calibration of the aftertouch VCO levels on TRG3 I was fighting with one trimpot, where the terminal kept showing 15.6V (goal was 6.0V), ignoring turns, except when turning to the minimum, where it jumped suddenly to 8.6V. It turned out to be two connected soldering points, which must have been there from the start (QA fail, tsk tsk). Funny, that my former owners never seemed to have noticed it. Well, neither did I, but my touch levels were out of specs anyway. I have written more about it
here.
The second wtf is about the TRG boards triggering sequence. During assembly they must have confused some wires as the sequence is not in a chronological order, mine are triggered in this order: 1-2-3-5-4-7-6...
Calibration was really necessary here, some values on the TRG boards were totally out of specs. For instance, the initial brilliance level is supposed to be 6.4V, I had a variation of readings between 8V and 13V on the terminals. Some other levels were off too. No wonder my velocity and aftertouch behaviour was kind of messy.
After finishing a group of adjustments I recommend to wait some time (have a coffee or something), and then to measure those terminals again, especially those that require unsoldering wires. It's sometimes surprising how fast a value can go out of specs because of a jumpy trimpot or some other interference (or just by turning the wrong trimpot and not realizing it). If further correction runs have been made, I would wait some further time and do a control run again. As annoying it is, proper adjustment is real important here, as it will be audible if things are not even.
To find out which voice is currently sounding, the
a1-a8 terminals on
TRG3 board can be used. They will change the value if they are triggered.
Initial and after touch brilliance/level
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| KBC board, +8,5V Pinout |
The first part requires the following boards:
TRG1,
TRG2,
TRG4 and
TRG5.
All terminals from b1-b8 on TRG1 and TRG4 board need to be unsoldered and connected one at a time during adjustment with a jumper wire coming from the +8.5V terminal on the KBC board.
The KBC boards are the first two boards in the rail from the left. There are two
+8.5V Terminals, one has no cable attached, this one can be used for the jumper wire. I attached a wire with a mini alligator clip and tried to make sure, that I don't move or rip it off by accident. As the terminal is easily accessible it is not required to take the KBC board out.
To prevent accidental short cutting, heat-shrink tubes or something similar should be attached on the unsoldered wires.
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| TRG1, b1-b8 disconnected |
Be aware, there is a wrong label at one trimpot on TRG1 and TRG2. VR27 is labelled wrong and is actually VR23.
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| Wrong trimpot Label |
Initial Pitchbend
This part requires the
TRG4 board.
For setting the inital pitchbend level it's required to unsolder some terminals one last time. Caution, this time a jumper wire from the KBC board, providing
-6.5V is required. Those terminals are on the upper backside of the KBC boards and are easily accessible without having to take KBC board out.
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| KBC Board, -6.5V Pinout |
Aftertouch levers
This part requires the
TRG3 and
TRG5 boards.
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| TRG5 Board |
Not much to say here, adjusting goes smooth, some readings have been pretty much out of specs. I also had to do two re-adjustment runs on some terminals. I wonder if it was some kind of interference between the terminals.
Continue to Part 10:
Portamento, Ribbon and Keyboard Control
Reviewed by MFox
on
4:15 PM
Rating:
