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Acoustic Image Contra series II - No audio passing through preamp - Need schematic and parts list. The amp was overdriven due to bad ground in guitar. The amp powers up, but no signal is heard.

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I decided that without a schematic and parts list I shouldn't even attempt to repair it. I had taken the cover off and disconnected the control board from the amp. When putting it back together to return to owner, I noticed the plug and socket for the control board did not go together properly. After a little maneuvering, I managed to get then joined, and just like that the amp was working again. I suspect that who ever had repaired the ground on the guitar had opened the amp up as well, and just didn't get it back together properly. The amp wasn't really damaged, after all.

Posted on Dec 10, 2009

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Takamine TP4T Preamp blinking


It does sound to be fried but, you really don't have to replace it with the same exact model, look for an upgrade, I'm sure that manufacture and many others have one better. If it were my guitar, I would definitely think of it as upgrade time. The pickup is probably ok knowing that it can handle heat better due to its location and materials.

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You can try repair it. They are pretty basic. I would look for poor solder connections, and reflowing all solder joints in it would be prudent.

The hum is likely from a gain stage with a bad solder joint on the input isolation capacitor. Also check other wires and check for bad solder connections on the pickup connections as well. It can even pick up hum through a bad shieid/ground connection in the jack on the guitar

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Hi i recently bought a Takamine EG 260c G Series acoustic electric Guitar with TP-4T preamp installed in it. Now the problem is when i connect my guitar to an amplifier, the sound comes through it only...


That is working backwards from what it should be. I suspect a wiring error. Since this is a recent purchase, do NOT risk voiding your warranty. There isn't any real good documentation on the tuner.
I am not sure which tuner you have HOWEVER with one type, the FIRST press will turn on the tuner with the sound going out as well till the tuner goes off. The SECOND press silences the sound and is tuner only, the THIRD press turns off tuner and passes the sound. This is different than a lot of tuners and you will need to do three presses to restore sound instead of the usual two.

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i dont' see where this model has active pickups (guessing this is what you mean by pre-ampped).
The issue can be in a few places.

1) the strings could be too far from the pickups and the instrument needs to be tuned.
2) the pickups are bad
3) your jack is bad
4) the cable is bad
5) your equilizers are not corrected
6) your volume control is turned down or damaged
7) your amp is damaged

this is a small list of the basic possibilities.

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I don't have the exact schematic... however sometimes they have RF bypass capacitors to ground on the balanced input lines and one side gets shorted. The schematic I do have is for an AC100. It shows a rather unconventional input circuit. You can download it here and it MIGHT be close to your unit:

http://elektrotanya.com/roland_ac-100ut.pdf/download.html

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If the preamp is in the guitar, the battery is likely dead. When a dead battery "rests" for a short while it recovers a bit and may operate for a short time and shut down.

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If you just bought the guitar, take it back. Taylor has good warranty programs, take it back to the dealer. You may have a bad connection inside where the saddle pick up plugs into the graphic preamp, the fact that you hear a sound when you put the battery in or out indicates very little. You may have a bad preamp, like I said, if its new, don't wait get it back to the dealer or contact Taylor.

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