Ibanez - JD-9 Jet Driver  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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tube-exorcist
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Post by tube-exorcist »

Dirk_Hendrik wrote: And in your unit RLED is replaced by a jumper wire as well? Guess not.
Your guess is right, there is a 1k resistor:
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Post by tube-exorcist »

Dirk_Hendrik wrote: Thanks for the values. I had the connections already.
You are welcome.
Dirk_Hendrik wrote: Standard hi, gyrator mid tone control.
Yep..... only interesting is the Overdrive section - via the inverting input now.... a little bit non-standards-TS
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Post by Dirk_Hendrik »

Draft, incomplete. Correct component numbering, connector numbering, pot taper for the Mid and Tine control, cap values would be appreciated.http://www.dirk-hendrik.com/temp/Ibanez_JD9.pdf
Sorry. Plain out of planes.

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Post by tube-exorcist »

Here some of the missing things:

(jumpered) L1 at the input is marked on the pcb: L2
C23: 47p
C1: 22n
Q1: 2SC1815-GR
C2: 47n
R3 is not 47k, it is: 4k7
D1 is marked on the pcb: D7
D2 is marked on the pcb: D8
C4 is marked on the pcb: C3 and is 51p
R5 is not 10k, it is: 1k
C3 is marked on the pcb: C4 and it is µ22/50V
C5: µ22/50V
C6: 220p
C11: 2n2 (f res = 650 Hz)
CX is marked C9 and is: 10n
R6 is marked R13 on the pcb
CX2 is marked C14 and is 100n
Q2: 2SC1815-GR
CX3 is marked C7 and is 47p
C15: 1µ/50V
(jumpered) L2 is marked L1 on the pcb
C16: 100µ/16V
CXX is marked C17 and is: 47µ/16V
C8, C13, C18; C19 each is: 100n

anything else needed?
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Post by Dirk_Hendrik »

tube-exorcist wrote: Change list
Cool Thanks!
Update:
http://www.dirk-hendrik.com/temp/Ibanez_JD9.pdf
tube-exorcist wrote: anything else needed?
Connector numbering, grounding scheme and the taper for the Mid and Tone pot
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

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Post by tube-exorcist »

potentiometers are marked as follows:
VR1: B1M (Drive)
VR2: B10k (Mid)
VR3: B10k (Tone)
VR4: B100k (Volume)

P1/J1 (LED):
1: anode
2: kathode

P2/J2 ---------

P3/J3 ---------

P4/J4 (Footswitch):
wiring see pictures above, blue is pin 1.

P5/J5 (Input jack):
1: Tip (signal)
2: Ring (battery)
3: Sleeve (ground)

P6/J6 (Output jack):
1: Tip (signal)
2: Sleeve (ground)

P7/J7 (vol-tone-pcb) :
1: Tone, cw
2: Tone, ccw
3: Tone, slider
4: Volume, cw
5: Volume, slider
6: Volume, ccw (ground)

P8/J8 (drive-mid-pcb):
1: Drive, ccw
2: Drive cw + slider
3: Mid, cw
4: Mid, slider
5, Mid, ccw

BTW, the serial number of my unit is 1041472.
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Post by Dirk_Hendrik »

Cool! That seems to cover all. Regret to see they took the lin shortcut for the tone controls.

Updated;
http://www.dirk-hendrik.com/temp/Ibanez_JD9.pdf
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

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Post by pablomago »

I just got a used JD-9. When I plugged it in it was on and wouldn't turn off. I flushed out the switch with contact cleaner and now it will turn on only when the switch is pressed down. Bad switch? Any other ideas on a fix? I understand it's a true bypass design unlike other 9 series pedals.

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Post by pablomago »

I managed to get a switch from Ibanez. It took several weeks to get and was $16.00 and change, but should do the job. A friend with better soldering skills then I have is going to install it as it needs some fine circuit board work. Hopefully that's the only problem. I'll report the results.

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Post by pablomago »

IT LIVES! Not a bad little box. They were blowing them out at MF for $50. the other day.

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Post by Dirk_Hendrik »

So, in essence, you did a fine job! Excellent! :applause:
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Post by roseblood11 »

How does the mid pot work? I'd like to set the center frequency higher, as the sound gets muddy too quickly, if you turn the pot cw

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Chugs
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Post by Chugs »

The Mid control is a gyrator.

You can use this calculator to figure out how to change the response.

http://www.muzique.com/lab/gyrator.htm

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Post by roseblood11 »

Thanx!

Center frequency is 693 Hz - that's really low for a mids control!

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Post by roseblood11 »

So, changing R11 from 6k8 to 3k3 would bring the center frequency up to 995 Hz, and the Q will increase from 0.72 (around 2 octaves) to 1.03 8around 1 1/3 octaves).
Should be worth trying...

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Post by JD0x0 »

Thanks for this thread, it's a big help! I couldn't find a schematic to this pedal, and that EQ calculator is very useful. I'm now considering adding a simple 3 way switch for a mid shift.

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Post by jefbyos »

Hi

Thanks for this useful thread. I got a JD9, that I find pretty interresting to use on guitar (though the mid indeed is a bit low for my taste, so I keep the mod for that in mind).

I've tried this JD-9 on bass and It's very close to the sound I search : little distortion but with some nice hi-mid attack, and not too much of those "transistor" highs that can be heard on most overdrive meant for bass. So I wondered if I should try to tweak it a bit (less drive so I can use the pot above 9 o'clock, modify the mid frequently pot that I barely use by example). Or, if some of you knew a pedal with a close design that could give me that type of sound ?

Thanks in advance for your advice. ;)

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