SOLVED VHS - No Sound - Works w/Jumpered R5

[psycylus]

My VHS has no sound. I followed the instructions in a thread here with the same problem. When I jumpered R5 to ground I get a signal with all effects functioning. Seems like a bad EEPROM? Besides that all LEDs are functional and there doesn't seem to be any other problems.

I NEED HELP.

 

[psycylus]

I thought I purchased the EEPROM through PedalPCB. I did not. Got it through Tayda. hhhhhhhhh

 

[Robert]

Yep, you have to use the included EEPROM.

The thread is marked solved, I'm assuming you got it working?

 

[mkstewartesq]

Yeah, one of the very first builds I did when I got into this hobby, back when I knew next to nothing about nothing (now I have advanced to knowing a slight amount about very few things), listed the EEPROM chip by part number in the BOM, so I dutifully ordered it from Tayda having no clue whatsoever what it was or what it did.

When the board arrived, it came with a programmed EEPROM, which I used so everything turned out fine. But for the past three years I’ve had my stash a spare, completely unprogrammed EEPROM chip that I will never program myself but is luckily the exact right size, shape, and configuration for me to mistake it for a charge pump or something and inadvertently detonate it in the course of some other build.

M

 

[psycylus]

Yep, you have to use the included EEPROM.

The thread is marked solved, I'm assuming you got it working?

Plot twist: I was using the EEPROM that came with it. For some reason I had the memory of ordering it through Tayda .
Anyhow, I already ordered a replacement and its on its way so I guess we'll see how that goes. Not solved yet it seems. Will update as soon as it arrives. Not sure what else it could be given it works when I jumper R5?

 

[jwin615]

Robert, are the programs duplicated on the eeprom 4x?
@psycylus, if you life one side of R5, do you get a tremelo verb and a echo verb in the 2 switch positions?
If not what 2 effects do you have?

 

[Robert]

Robert, are the programs duplicated on the eeprom 4x?

There are four programs on the FV-1 that are selected by the Chorus and Reverb toggle switches (programs 0 - 3).

Plot twist: I was using the EEPROM that came with it. For some reason I had the memory of ordering it through Tayda .
Anyhow, I already ordered a replacement and its on its way so I guess we'll see how that goes. Not solved yet it seems. Will update as soon as it arrives. Not sure what else it could be given it works when I jumper R5?

I'll refund your payment for the second EEPROM.

 

[psycylus]

There are four programs on the FV-1 that are selected by the Chorus and Reverb toggle switches (programs 0 - 3).



I'll refund your payment for the second EEPROM.

Thank you man, much appreciated.

 

[psycylus]

Robert, are the programs duplicated on the eeprom 4x?
@psycylus, if you life one side of R5, do you get a tremelo verb and a echo verb in the 2 switch positions?
If not what 2 effects do you have?
View attachment 98734

lemme get it connected and I'll let you know asap. Thanks for the help.

 

[PJS]

I had a problem on a different FV-1 pedal once where it would work fine on the internal programs but not external. The pins on the FV-1 had continuity to the pins on the EEPROM according to the multimeter. When I retouched the solder on the FV-1 pins it suddenly worked. The high speeds of the communication obviously need really good connections.

 

[psycylus]

There are four programs on the FV-1 that are selected by the Chorus and Reverb toggle switches (programs 0 - 3).



I'll refund your payment for the second EEPROM.

Problem solved. It was the EEPROM. I just received the new one I ordered and the pedal is now working properly. Thanks for everybodys help!