Maestro Fuzztain questions;

Started by Bernardduur, August 23, 2007, 04:54:18 PM

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Bernardduur

Hey all!

I am currently repairing a Maestro Fuzztain (Schematic) and next to the known sounds I get from it (nice little box) I want it to be like the old unit

So

Anyone knows the specs of the lamps??? Right now I tried a 12V lamp but it does not light up. The case is:
- Without the lamps the LED works; voltage is 8.9V
- With the lamps the voltage drops to 0.2V and both the lamps as the LED does not work

What do you think' is the D16P1 faulty??? What could be a suitable replacement of it? Or is it the lamps I use???


Oh, btw, schematic has errors; R24 is 100 ohm, not 100k
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Sir H C

Are you using a battery?  The lamp only works with the AC adaptor.

Mark Hammer

That kinda makes sense.  The illustration on page 7 of the PDF shows that the lamps appear to be for providing constant illumination of the side-mounted controls.  Hard to imagine a 9v battery lasting very long under those conditions.

Bernardduur

True!

I only use an adapter; 9V though

If you check out this schematic and scrolld own to power secion it is written that the lamps only works with a 12V adapter; I'll try it on 12V

Weird is that the LED won't work when used with a battery :)
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Sir H C

If you look at the schematic, it seems that it might use some odd AC adaptor with a stereo plug, and the ring is the voltage for the LEDs.  So you might need something different to get the LEDs to light, because with a regular plug, that node is grounded and so no LEDs.

Bernardduur

#5
Quote from: Sir H C on August 24, 2007, 05:39:23 PM
If you look at the schematic, it seems that it might use some odd AC adaptor with a stereo plug, and the ring is the voltage for the LEDs.  So you might need something different to get the LEDs to light, because with a regular plug, that node is grounded and so no LEDs.

I think it is not a stereo one but a switched one; so if you put a plug into the jack you switch on the LED / lamp path

Edit: it is a stereo one; I checked with the original


But I already replaced the original jack with a boss style jack (and hotwired both to the V+) so the question remains!
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Bernardduur

Sorry to bump this thread but the quesion still remains
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