Zoom - PD-01 Power Drive

emilpaulsrud · Post by **emilpaulsrud** » 09 Jun 2017, 11:32

Hi!

I recently acquired this effect and thought I'd upload some gutshots of it. There were some previous discussion and, now unavailable, pictures in the Zoom Ultra Fuzz thread. There's also a schematic for this floating around on a website (which I for some reason cannot seem to find at the moment).

Anyway,

Here you go: https://postimg.org/gallery/1czio7xfw/

ThiagoFaraday · Post by **ThiagoFaraday** » 09 Jun 2017, 19:34

It's an interesting pedal.

I do not know if this scheme is correct.

emilpaulsrud · Post by **emilpaulsrud** » 10 Jun 2017, 10:33

Yes, that's the one.

It looks like a partial schematic. Some parts are missing. For example the power section, D7 doesn't go anywhere in schematic, R23 is mentioned twice. On the whole I think it looks OK though. I'll try compiling a parts list just to double check against the schematic.

emilpaulsrud · Post by **emilpaulsrud** » 13 Jun 2017, 14:46

I've now double checked parts against the schematic and it matches mine exactly. The only thing that's wrong in the schematic is, like I mentioned before, that R23 is mentioned twice. The R23 that's connected to C4 should be R24. The value 100K is correct though.

Other than that, there's a few parts that's omitted. Namely the switching and the power supply. As far as I can see. I haven't checked the tracing more than briefly but I think it's probably OK.

Here's my list of components.

Underlined components are not in the schematic above.

Capacitors
Those not mentioned are SMD:s, or omitted on the board.

C1: 1uf
C2: 10nf
C3: 10uf
C4: 0,47uf
C7: 10uf
C8: 10uf
C11: 220uf
C12: 270nf
C13: 47nf
C19: 150nf
C20: 10uf
C23: 10uf
C24: 470uf
C26: 220uf
C29: 0,47uf
C31: 10uf
C32: 220uf
C33: 22uf
C34: 10nf
C35: 10nf
C36: 22nf
C37: 0,1 uf
C41: 100uf
C43: 0,47 uf

IC:s

IC1, IC2, IC3, IC5, IC9: JRC4558
IC4: JRC2352

Transistors
These are a bit tricky. I'm not familiar with SMD-codes on transistors, and google gave me some inconclusive results. This is what I could read on them:

Q1: LY
Q2-Q3 (not on the board)
Q4: JY
Q5: BX

Diodes

D1, D2, D3, D5, D6, D7, D9: Unknown
D4: Probably 1N4xxx-type
D8: Not on the board.

Resistors

R1: 560R
R2: 1,8k
R3: 100K
R4: 13K
R5: 4,7K
R6: 5,6K
R7: 470K
R8: 390k
R9: 10k

R10: 22K
R11: 10K
R12: 3,3K
R13: 22K
R15: 1K
R16: 1K
R17: 330R
R18: 3,3K
R19: 1K

R20: 1K
R21: 16K
R22: 820R
R23: 100K
R24: 100K
R25: 1M
R26: (not on the board)
R27: 15K
R28: 100K
R29: 1,3k

R30: (not on the board)
R31: 13K
R32: 180K
R33: 13K
R34: 13K
R35: 1,2K
R36: 12K
R37: 1K
R38: 10K
R39: 1M

R40: 47K
R41: 51K
R42 - R45: (not on the board)
R46: 22K
R47: 100K
R48: (not on the board)
R49: 100R
R50: 10K

L2 (?): 270R

emilpaulsrud · Post by **emilpaulsrud** » 13 Jun 2017, 17:18

IC4, IC9, Q5, D3-D6 and D9 are also not in the schematic.

emilpaulsrud · Post by **emilpaulsrud** » 15 Jun 2017, 10:01

It dawned on me that the Zoom Ultra Fuzz, which is traced already, naturally has some parts in common with this. I also happen to own that pedal. The switching uses the same parts as far as I can see for example. I'll do some comparisons and see what I can come up with.

xycarta · Post by **xycarta** » 29 May 2022, 16:21

I have a bad unit that needs to replace the Q5. But I don't the Q5 part name. Anyone could help?

Lithium_Grim · Post by **Lithium_Grim** » 29 May 2022, 19:13

https://www.s-manuals.com/smd/bx

Zoom - PD-01 Power Drive [schematic]