Thanks for the feedback. Oh yeah, I forgot about what the Service Notes and previous posting years ago said on the dials.
They actually have the Rate off and Depth on full (see below). The BOSS CE-2 "Service Notes" has the dials set the same and Rate off and Depth on full (see attached). Hope this helps as again, there was no directions in the thread no the Document Files! Not sure what a Pork Barrel is and why not the same as BOSS service directions! That just confuses which way to go!! :O Hope this helps.
CE-2 BIAS PROCEDURE:
This is a quick how-to for the CE-2 trimpot adjustment, or more correctly "how to set the BBD operating point".
Just done this to my MIT ACA CE-2 and it will work on any CE-2.
Tools
- You will need a scope. No way around it. I bought an old Tektronix 2215A off eBay for $100. A worthwhile investment...
- Phillips screwdriver to remove the back plate.
- Small flat-blade screwdriver to adjust the pot.
Procedure
0) Go get the service notes from here:
http://www.godiksennet.com/images/sch/CE2.jpg
1) Remove the backplate and swing the board out
2) Obtain a 200Hz +3dBm signal source. I used CoolEdit on my PC to generate a 200Hz wave, then put it through a little Behringer mixer I have to boost it up to +3 dBm. Power the pedal with a known good battery (or the correct Boss power supply). Plug a lead carrying the +3dBm signal into the pedal input and turn on the pedal. Turn the "rate" pot fully anti-clockwise and the "depth" pot fully clockwise.
3) Set the scope to 500mV/division, 1ms/division sweep, and "AC" in. Use the service notes to locate Q3 on the board. It is quite near the trimpot. Connect the scope probe to the emitter of Q3 - it is leg of Q3 furthest from the trimpot. I just held my probe tip onto the solder pad on the solder side of the board.
4) Increase the incoming signal until you see one of the three waveforms on the service notes. If your signal is too low, the waveform will look like a perfect sine wave - wind up the signal until it starts to clip and looks like one of the three waves. Once you see a clipped waveform, "center" the waveform by turning the trimpot (i.e. until there is equal clipping on top and bottom of the waveform).
5) Once the waveform is centered, lower the incoming signal until one of the sides of the waveform stops clipping - this will look like either the top or bottom waveform on the service notes. When this happens readjust the trimpot until the waveform is again "centered" (there is equal clipping on top and bottom of the waveform).
6) Disconnect everything, and close up the pedal. You are done!
Note that at no point in the adjustment are we looking at DC-offset. Just leave the scope input set to "AC".
Looking at the CE-3 schematic, this same process will also work for the CE-3 (only change is the measuring point is Q8 in the CE-3, not Q3). You are on your own finding the emitter of Q8...