PreenFM > preenfm2 and preenfm3

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Tenchi:
Hi

I've constructed the PreenFM 2 as per instructions. I've got to the step where you press the OP button while switching the unit on and .......
nothing.
The screen is lighting up but thats all.
I feel i've followed the instructions to the letter and now i'm stuck.
Any help would be welcome

Thanks

Xavier:

Hi,

And what do you see if you switch on without pressing "Op" button ? nothing either ?
The cerb40 you reveived with  your Kit is ready to use so it should boot normaly without any flashing.

Switch on the PreenFM, without pressing any button.
Have you tried to turn the LCD resistor contrast to the end in both direction while looking at the LCD ?
Have you tried sending midi notes to the Midi IN Jack ? Do you hear any sound on the audio jack ?

Let me know,
If nothing works, next step will be to check the 3.3V points on the PCB.

Xavier

Tenchi:
Hi Xavier

what do you see if you switch on without pressing "Op" button ?

nothing

Have you tried to turn the LCD resistor contrast to the end in both direction while looking at the LCD ?

Yes

Have you tried sending midi notes to the Midi IN Jack ?

Yes

Do you hear any sound on the audio jack ?

No, no sound.

OK where are these 3.3v points?

Thanks

Xavier:
JMP3 is unshorted, right ?

Here are the 3.3V in the attached png:
Check all the soldering point circled in orange.

Xavier

Tenchi:
Hi

The JMP3 was shorted, i removed the jumper and tried again with no luck.
All voltages at the points shown are correct. The LCD dims and brightens when moving the trimmer.
I've re flowed all solder joints and still nothing.
Any further hints?
Thanks

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