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FIXED! Accent not working
Posted: May 31st, '16, 21:45
by rv0
Accent steps and accent pot have absolutely no influence on the sound.
I always thought the 4011 in accent section was to blame, but just replaced that by the part from mouser BOM and no improvement.
Voltages on the 4011 are fine. It's probably something simple but I'm just not seeing it (and not understanding the accent circuitry enough)
I'd love to get some assistance with this. I have access to an oscilloscope if needed.
edit: fixed
Re: Accent not working
Posted: Jun 6th, '16, 10:30
by SubStyler
rv0 wrote:Accent steps and accent pot have absolutely no influence on the sound.
I always thought the 4011 in accent section was to blame, but just replaced that by the part from mouser BOM and no improvement.
Voltages on the 4011 are fine. It's probably something simple but I'm just not seeing it (and not understanding the accent circuitry enough)
I'd love to get some assistance with this. I have access to an oscilloscope if needed.
check the transistors in your accent circuit especially Q27, Q32 and Q34!
check for proper orientation and bad solder joints or just try to replace them.
Re: Accent not working
Posted: Jun 7th, '16, 09:49
by rv0
SubStyler wrote:rv0 wrote:Accent steps and accent pot have absolutely no influence on the sound.
I always thought the 4011 in accent section was to blame, but just replaced that by the part from mouser BOM and no improvement.
Voltages on the 4011 are fine. It's probably something simple but I'm just not seeing it (and not understanding the accent circuitry enough)
I'd love to get some assistance with this. I have access to an oscilloscope if needed.
check the transistors in your accent circuit especially Q27, Q32 and Q34!
check for proper orientation and bad solder joints or just try to replace them.
hi SubStyler
thanks for the help.
Well, I had tested all the transistors and they were all fine.. I found the mistake, it was very silly: swapped R122 3.3k instead of 33k
Dunno how that mistake has happened, as I sorted everything before... Oh well, glad it's fixed. Took me way to long.. checking the chip and transistors first, and also verified some resistors, but never checked R122 :stupid:
Re: Accent not working
Posted: Jun 7th, '16, 16:24
by SubStyler
rv0 wrote:SubStyler wrote:rv0 wrote:Accent steps and accent pot have absolutely no influence on the sound.
I always thought the 4011 in accent section was to blame, but just replaced that by the part from mouser BOM and no improvement.
Voltages on the 4011 are fine. It's probably something simple but I'm just not seeing it (and not understanding the accent circuitry enough)
I'd love to get some assistance with this. I have access to an oscilloscope if needed.
check the transistors in your accent circuit especially Q27, Q32 and Q34!
check for proper orientation and bad solder joints or just try to replace them.
hi SubStyler
thanks for the help.
Well, I had tested all the transistors and they were all fine.. I found the mistake, it was very silly: swapped R122 3.3k instead of 33k
Dunno how that mistake has happened, as I sorted everything before... Oh well, glad it's fixed. Took me way to long.. checking the chip and transistors first, and also verified some resistors, but never checked R122 :stupid:
yess... good job!
