Deflector won't Deflect......

[jcrews]

Fully stumped. I've metered every component. reflowed any suspect joint. Mine's doing the thing where the bypassed signal and effected signal are exactly the same. Knobs make no change in any direction.

I've changed the two IC's i had (the 16 pin guy and the standard tl072) I ordrered another eeprom ic but don't have a BIN file or a way to load anything on it......

Damndest thing. All solder joints are solid. It usually jumps out on my first careful review but im stumped. I guess I could request another EEPROM ic (or buy one) but that's the last chip i can switch out. FV-1 was presoldered.

Does anyone have voltages for the L78L33?

going through the search i see this has happened to someone else and it was a misvalued cap. I believe i have that ruled out.

 

[Funnel]

Have you used an audio probe to see if there is audio coming through the reverb side of the pedal?

 

[Bricksnbeatles]

Does anyone have voltages for the L78L33?

Pin 2 is ground, so should be 0v

Pin 3 is Vin, so it should be around +9v

Pin 1 is Vout, so it should be +3.3v

 

[jcrews]

Pin 2 is ground, so should be 0v

Pin 3 is Vin, so it should be around +9v

Pin 1 is Vout, so it should be +3.3v

I'm getting 3.2v, 0v and 8.9v.... so i guess that works. I haven't had to use my probe in forever. I'll have to dig it out of the parts bin but I'll try to find that and get you guys some more info on the pinout at the fv-1

Thanks,
JC

 

[Dan M]

I assume you checked the foot switch with your meter in both positions?

 

[Mcknib]

Here's voltages of my working one
Voltage in 9.04v

IC1
1. 4.36
2. 4.36
3. 3.92
4. 0
5. 4.34
6. 4.32
7. 4.38
8. 8.72

IC2
1. 1.61
2. 1.61
3. 1.61
4. 0
5. 3.23
6. 3.23
7. 0
8. 3.23
9. 1.55
10. 1.49
11. 0
12. 0
13. 3.21
14. 3.23
15. 3.23
16. 0
17. 0
18 0
19. 0
20. 0.44
21. 2.17
22. 3.24
23. 3.24
24. 0
25. 0
26. 3.22
27. 1.65
28. 1.65

Hold on my arms gone numb.....

IC3
1 to 4 and 7. 0
5. 3.23
6. 3.23
8. 3.24

IC4
1. 3.24
2. 1.49
3. 1.46
4. 1.46
5. 1.46
6. 3.23
7. 1.92 varies
8. 0
9. 4.24 varies
10. 3.24
11. 1.1 varies
12. 0.06 varies
13. 0
14. 0.54
15. 3.24
16. 0.1

The variable voltage pins drop voltage down

 

[jcrews]

This was super useful. Thank you. I know that was a pain in the ass. When i get a break today I'll take mine down and post my numbers. Switch is good btw.

Thanks y'all.

 

[bhcarpenter]

Dumb question, but do you have dust caps on the pots behind the board or some other way of insulating them? You could have a short to ground in the effected sound path.

 

[jcrews]

absolutely. I usually don't use them on the top row of pots since there's nothing to ground out on them, but the bottom three are covered with the right 16mm pot covers

 

[rkspks]

Hey, did you manage to figure it out? I have the feeling I have the same issue, see thread I just posted.