Is it a total waste of time to try to fix this Biyang RV-10 Tri Reverb? Symptoms: LED doesn't light and effect doesn't activate, only the clean signal passes as the footswitch is clicked and clicked. It has done this a couple of times over the last month or so, and usually removing and reinserting power fixed it. Same result on battery. The footswitch itself is working properly. Voltage is present at various places in the circuit, but without a schematic... with SMD resistors and caps... It's a little overwhelming. I'm anxiously awaiting a reply from Biyang ;) .
(http://i206.photobucket.com/albums/bb54/seedlings/ChadiPhone116.jpg)
(http://i206.photobucket.com/albums/bb54/seedlings/ChadiPhone115.jpg)
(http://i206.photobucket.com/albums/bb54/seedlings/ChadiPhone117.jpg)
(http://i206.photobucket.com/albums/bb54/seedlings/ChadiPhone119.jpg)
(http://i206.photobucket.com/albums/bb54/seedlings/ChadiPhone118.jpg)
CHAD
Well, Lindy replied,
"Nice to see you in this email address and now please let me know the quantity of your defective pedals and please believe me I could do my utmost to help you, Generally, any schematic of our product are not allowed to give other customers, all this are the regulations in our company, So very sorry I couldn't give it for you, and you can tell me anything and later I can pass your word to my technician, Thank you!"
I gave her my word.
CHAD
It looks like Lindy's the same person who writes those emails telling me that someone has bequeathed me a bunch of money and I just have to send a little cash to get the paperwork done. :lol:
Bad jack, bad solder joint, or just too much stuff in too little space at too low a price.
You may be able to find/fix the first two problems with a bright light and a close-up eye.
Given the name of the pedal, the price, and the function, should we assume that this uses a trio of PT2399 chips to produce reverb?
If so, most of the troubleshooting tips for the various PT2399-based circuits here will likely apply. And there are plenty of them.
Quote from: Mark Hammer on March 19, 2012, 09:24:39 AM
Given the name of the pedal, the price, and the function, should we assume that this uses a trio of PT2399 chips to produce reverb?
If so, most of the troubleshooting tips for the various PT2399-based circuits here will likely apply. And there are plenty of them.
I need to get a magnifying glass and a better camera. I couldn't read them. Or, perhaps get one of the kids to look at it!
Biyang asked for a video of the trouble. What- is there a language barrier or something?
CHAD
Quote from: seedlings on March 19, 2012, 09:32:39 AM
Biyang asked for a video of the trouble. What- is there a language barrier or something?
CHAD
Yes.
-i'd check the traces under the dc jack, and in/out jacks, those pc mount jacks seem to break their traces alot... might be easy as reflowing the solder over a break...
Quote from: Quackzed on March 19, 2012, 11:13:33 AM
-i'd check the traces under the dc jack, and in/out jacks, those pc mount jacks seem to break their traces alot... might be easy as reflowing the solder over a break...
I thought that too, but the meter shows good voltage on various places throughout the circuit - in fact there is 5V across what (best I can tell) seems like where the LED is soldered in, but won't light. I checked grounds from the input/output jacks back to the DC jack. Checked continuity from input/output to the footswitch. At lunch I'll try to read the ICs, then do some searching here.
CHAD
I haven't messed with reverb or delay yet, but these ICs don't ring any bells. Anyone? All I know is U2 is known for delays :icon_wink:
(http://i206.photobucket.com/albums/bb54/seedlings/BiyangTriReverb.png)
CHAD
I agree, it's going to be pretty hard to fix it without a schematic.
Quote from: seedlings on March 19, 2012, 01:13:58 PM
I haven't messed with reverb or delay yet, but these ICs don't ring any bells. Anyone? All I know is U2 is known for delays :icon_wink:
(http://i206.photobucket.com/albums/bb54/seedlings/BiyangTriReverb.png)
CHAD
Grab a magnifying glass and tell us what the chips are. Given Biyang's tyical pricepoint, I would be very surprised if these were NOT Princeton chips.
IC9 is http://www.bdnc.com/datasheet/bd3201-14A_spec_V1.6.pdf
I can't find IC6 or IC7, but one of them has to be a clock.
CHAD
A-HA!!
It's the Wavefront chipset that Alesis used to use, and which forms the basis of the Femto-Verb project you can find out more about in the Digital sub-forum here. The 3201 will provide 16 different effects, and Biyang has elected to use only 3 of them.
You want an incentive? If you can repair it, there may be additional effects available to you for the cost of a couple of toggles.
Erm.. I can read them
IC9 has 3201 on it.. that is looks like a BBD number
IC6 and IC7 unknown.
IC2, IC1 and IC5 are all 4558 quad opamps.
So no, princeton..
EDIT: Sounds like a bypass problem by the way.. perhaps one of the other chips is a flipflop.. it could be just the switching that is bad.
Quote from: ~arph on March 20, 2012, 11:41:49 AM
Erm.. I can read them
IC9 has 3201 on it.. that is looks like a BBD number
IC6 and IC7 unknown.
IC2, IC1 and IC5 are all 4558 quad opamps.
So no, princeton..
EDIT: Sounds like a bypass problem by the way.. perhaps one of the other chips is a flipflop.. it could be just the switching that is bad.
What kind of bypass problem? The clean signal passes with the footswitch clicked or clicked (there is a faint loss of highs every other click). The LED quit working. These all happened simultaneously, and have happened before, but cycling power to the pedal cleared the trouble. I checked each set of contacts for the footswitch, and the top 3 are shorted while the bottom three are open, and vice-versa with a click.
Quote from: Mark Hammer on March 20, 2012, 11:39:58 AM
A-HA!!
It's the Wavefront chipset that Alesis used to use, and which forms the basis of the Femto-Verb project you can find out more about in the Digital sub-forum here. The 3201 will provide 16 different effects, and Biyang has elected to use only 3 of them.
You want an incentive? If you can repair it, there may be additional effects available to you for the cost of a couple of toggles.
I would LOVE to have rotary speaker option!!!!!
Also, it seems like the pins that connect the top daughter-board to the main board should 'pop apart' like they're seated in sockets (see the DC jack view picture)... but I've applied as aggressive of pressure as I care to, yet they don't budge.
CHAD
IC7 ;D
http://www.cirrus.com/en/pubs/proDatasheet/CS5340_F2.pdf
A/D Converter
Quote from: ~arph on March 20, 2012, 11:41:49 AM
Sounds like a bypass problem by the way.. perhaps one of the other chips is a flipflop.. it could be just the switching that is bad.
I thought that at first, but if it had the DOD bypassing scheme that uses an IC chip, why would a 3PDT switch be required? It would only need to be a SPST momentary switch in that case IIRC.
Quote from: Govmnt_Lacky on March 20, 2012, 12:10:50 PM
IC7 ;D
http://www.cirrus.com/en/pubs/proDatasheet/CS5340_F2.pdf
A/D Converter
Good eyes! Thank you! <thumbs up> Does this mean IC6 is the clock?
CHAD
Quote from: Paul Marossy on March 20, 2012, 12:15:03 PM
Quote from: ~arph on March 20, 2012, 11:41:49 AM
Sounds like a bypass problem by the way.. perhaps one of the other chips is a flipflop.. it could be just the switching that is bad.
I thought that at first, but if it had the DOD bypassing scheme that uses an IC chip, why would a 3PDT switch be required? It would only need to be a SPST momentary switch in that case IIRC.
It is supposed to be true bypass.
CHAD
Quote from: seedlings on March 20, 2012, 12:16:25 PM
Does this mean IC6 is the clock?
I think that the 3201 chip is set up like the Spin Semi FV-1. Does not need an external clock. The clock and LFO are internal.
Hope that helps. ;D
P.S. Of course, I could be totally wrong about this but, that is how the datasheet read to me :P
IC9 is a digital reverb engine chip BD3201-14a
http://www.bdnc.com/datasheet/bd3201-14A_spec_V1.6.pdf
IC6 is a CS4340 is a D/A converter
http://pdf1.alldatasheet.com/datasheet-pdf/view/58109/CIRRUS/CS4340.html
IC7 ia a CS5340 A/D converter
http://pdf1.alldatasheet.com/datasheet-pdf/view/115334/CIRRUS/CS5340-CZZ.html
The other 3 chips are ST microelectronic EF797 dual op amps.
There is no clock chip , the main processor takes care of all that.
Quote from: Ice-9 on March 20, 2012, 12:44:20 PM
IC9 is a digital reverb engine chip BD3201-14a
http://www.bdnc.com/datasheet/bd3201-14A_spec_V1.6.pdf
IC6 is a CS4340 is a D/A converter
http://pdf1.alldatasheet.com/datasheet-pdf/view/58109/CIRRUS/CS4340.html
IC7 ia a CS5340 A/D converter
http://pdf1.alldatasheet.com/datasheet-pdf/view/115334/CIRRUS/CS5340-CZZ.html
The other 3 chips are ST microelectronic EF797 dual op amps.
There is no clock chip , the main processor takes care of all that.
Sounds like that's the essence of the pedal. So why won't it switch to effect on mode?! What is the most likely culprit with it apparently being a conventional 3PDT switch based true bypass pedal?
Quote from: Paul Marossy on March 20, 2012, 12:48:43 PM
What is the most likely culprit with it apparently being a conventional 3PDT switch based true bypass pedal?
Any of the above!
An audio probe will give an easy check of opamps in the audio path and the output of the D/A converter. I guess you'd need a scope to see if the A/D and 3201 outputs are working.
I would start by making sure that the 3.3V regulator is functioning as this is what the processor, D/A, and A/D are powered by.
If it is anything like the FV-1, it REALLY, REALLY needs that voltage to be AT LEAST 3.3V to work well.
Quote from: Govmnt_Lacky on March 20, 2012, 12:54:36 PM
I would start by making sure that the 3.3V regulator is functioning as this is what the processor, D/A, and A/D are powered by.
If it is anything like the FV-1, it REALLY, REALLY needs that voltage to be AT LEAST 3.3V to work well.
+1. Sounds like a good place to start. Easy to verify with a DMM.
Dirty dog!
I went to check some voltages at lunch and the thing came on! While it was on I tapped around with the chopstick to see if it would glitch, but no! :icon_question: :icon_question: :icon_question:
???
CHAD
Doh! This is one of those weird intermittent problems that can drive you nutz! :icon_confused:
you got gremlins...
(http://drthomreece.files.wordpress.com/2012/03/gremlin-1.jpg)
Is that what an electron gremlin looks like?
I didn't feed it after midnight, and I hummed that cool song it likes ;D
Re-boxed and it still works. Like I said, it's done this before, just not for this long. I did notice one thing that may or may not make any difference. The stereo input jack is wired so that a cord has to be inserted for it to power up on batteries and via DC adapter. When the pedal is powered, and then the input cord is inserted, it takes about one second for the LED and effect to come on. Is this suspicious at all to you?
CHAD
Not at all.
Typical wiring is that the input jack makes a ground connection for the power supply when a plug is inserted, and does not discriminate which sort of power supply it may be.
It may be the case that the delay for powering up is a reflection of a) a big power supply cap that takes a moment to charge up, or b) some routines that the digital side of things has to go through before signal can be passed.
I had the same problem and after about an hour of poking around I got it fixed. The transistor in the red square was toast. I replaced it with a BS170 and the pedal came back to life.
I was sure I was just gonna have to chuck it. Whew!
(http://cl.ly/2o13300X2W1Z1f092c3R/BiyangTrans.jpg)
I'm trying to fix this effect. The picture above is blocked by antivirus program and reported as dangerous. Can anyone tell me what type is the Q6 transistor (I suspect it has failed)? I cannot see the symbol.
Quote from: eagleaudio on January 20, 2017, 01:38:49 PM
I'm trying to fix this effect. The picture above is blocked by antivirus program and reported as dangerous. Can anyone tell me what type is the Q6 transistor (I suspect it has failed)? I cannot see the symbol.
I think it's an S8550.
I was having the same problem as OP - I replaced mine with an MPS8599... it was the closest thing I had with the same pinout. Works fine now. Nice reverb!
Same issue here, pedal wouldn't turn on. Changed the usual suspect S8550 and now it turns on and passes signal, but only clean, no effect and controls make no perceptible changes.
Any ideas/pointers where to check next? Not sure it's worth the effort as it's awfully tight with all the smd, but hey, fixing stuff is fun, right? :icon_lol: