Need a schematic for a Dunlop JD-4S ROTOVIBE

[01redcobra]

Need a schematic for Dunlop JD-4S ROTOVIBE new model. It appears to be only a few weeks old. I have one that is dead, no leds lighting, just totally dead. If no schematic I could use the wire layout for the connector at the circuit board too.It appears that someone may have switched the wiring around.

[Enzo]

I have the old model drawing, but if yours is dead, find a chip in it somewhere and see if there is power supply present... probably not. If not, then go over to where power comes in and make sure it gets there. Look at the traces in that area and look for cracks in the solder. Check any diodes you see for short or open. You cannot check the zeners for "zening," at least without power, but if they are shorted or open, you can count on them not zening either. Zeners usually operate "backwards," but they still act like a diode forwards, though their junction drop tends to be a little higher than a plain old diode. If there are any transistors associated with said diodes, check them.

The old version has a three leg Vreg - 7809 - does yours?

WHat power source are you using, battery or adaptor? And have you tried the other?

Look at the input jack. SOlder OK? It completes the battery circuit.

[01redcobra]

I checked where the power comes in (I have tried battery and adaptor) and it goes to a transistor with the numbers F0216 NPS A10 on it. I have 9v at all three legs at this point. My biggest concern right now is whether the wires to the pcb are in the correct order. I know the + and - are right, but the rest are up for grabs.
That's about as far as I got tonite. The worse part is this pedal looks like it was never used! But he wires to the pcb were all off.

[Andy S.]

Redcobra,

here is the pic I took of the one I finally got working. I returned it to the shop today so the customer could pick it up, so try using the pic to get the colors for the wiring.

Andy S.

[Jazz P Bass]

[QUOTE=01redcobra;22157]I checked where the power comes in (I have tried battery and adaptor) and it goes to a transistor with the numbers F0216 NPS A10 on it. I have 9v at all three legs at this point. QUOTE]

Not being too fond of unfinished posts, I thought I would add to this post.

The transistor in question is a MPSA18.
NPN type, EBC layout, 45 volts, 100 ma's.

The voltages, as noted are an indication of the problem.
The transistor is shorted.

The correct voltages should read:
E: 6.6 volts
B: 7.25 volts
C: 9 volts

The DC adapter uses the outside shell as + & the middle tube as - Vdc.