HAARP wrong IC

[Flopman]

Hi all, not sure where to post this question so this seems like a good place as any.
I recently ordered a HAARP PCB with the included EEPROM, problem is the EEPROM is wrong. The algorithms are a tremolo/vibrato, chorus, some kind of doubler and reverbs. They also don't function properly, probably because of an improper board.
I tried contacting support regarding the order but didn't get any answers.

Can anyone point me in the right direction where I can get the appropriate EEPROM?

Thanks

 

[jwin615]

Are you sure they're not just the internal programs?

 

[Robert]

Can anyone point me in the right direction where I can get the appropriate EEPROM?

We can get you another EEPROM but I'm not entirely sure that is the issue.

Temporarily connect the left side of R5 to ground and see if the effects change or stay the same.

 

[Flopman]

Ah, I didn't know that could be the case. I'll check that and get back. Thanks for the support!

 

[Flopman]

Ok I tried connecting the left side of R5 to ground and the effects in fact did not change. Checking with the list from above they do seem to be the internal programs. Thanks for the clarity on the matter.

Now does anyone know what could cause the pedal not to load the EEPROM? I checked and all connections and values seem correct.

 

[jwin615]

Make sure you have 3.3v at the red points. Continuity (power off) between the green and blue points.

 

[Flopman]

There is continuity between the blue and green, 3.3V at the EEPROM Pin 8, but only around 0,2V at the FV-1 pin 13

 

[jwin615]

Recheck R5 value and maybe reflow it. That pin tells the fv-1 to use the eeprom when it's high.

 

[Flopman]

Wired a jumper between the 3.3V line and R5 and now it works. Thanks all for the help and new information!

 

[jwin615]

Glad it worked out.
I would advise getting a functional/proper value resistor in R5s spot. guessing it's for current limiting. It's in the datatsheet circuit as well. Maybe to prevent overtemping the fv-1?

 

[Robert]

It's a pull-up resistor, pretty much any value will work but 10K / 100K are the most common values there.

Some designs connect 3.3V directly to that pin, no pull-up resistor at all, but if you do that you can't ground the pin to test the internal programs.

 

[jwin615]

Doh! Yeah. I didn't consider the internal/external ROM switch being the need for it.

 

[Flopman]

The resistor still is in place and measures around 10k, the issue was that 3.3V wasn't getting to it. So I soldered a wire directly from the 3.3V pin of the regulator to the right end of the 10k, since that's where I noticed the drop in voltage. The connection from Pin 13 of the FV-1 and the left side of R5 had continuity, but the right side to 3.3V didn't.
Anyway, thanks everyone for helping resolve this.

 

[Robert]

Glad you got it straightened out, and sorry I missed your email!