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Crate PCM-6 output distorts - Crate Music

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Need schematic for Crate PCM-8 DP+


Without a schematic you can still trace the circuit to locate the fault.

Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.

Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.

With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.

Also check switches and especially those with interupts on the input and output jacks- they can get dirty.

Apr 10, 2012 | Music

1 Answer

I have a crate cpb150 amp i want to connect it to my digitech gsp2101 via livewire stp-202 cable what is the correct way?


I can understand your confusion... and a lot depends how you are going to use this. There are some caveats regarding the connections,
If you use the 1/4 outputs on the GSP, there is a speaker modeling like function that is NOT available, that IS available IF you use the XLR outputs.
The STP is an "Insert Snake" which is not really what you want as it is intended to send and receive (audio going both directions in the cable.
If you want that speaker function, then you should get two XLR to 1/4 TRS cables and go from the XLR's on the GSP to the Left and Right inputs on the back of the Crate. Your audio or guitar then is connected to the GSP guitar input.
If you connect the guitar to the crate and then use the STP, Plug the TRS single connector into the Left/Mono/send/rtn on the Crate. The Send cable of the Y should go to the Send jack on the back of the GSP and the return should go to the left return jack of the GSP. This connection I would NOT recommend as it will be noisier and you will lose the stereo effect capabiltiy since the effect is inserted as a mono.

I believe you would be happier with using the XLR's to carry left and right to the Crate and run your inout to the GSP. In short, you have the wrong cable to do the best job.

Jan 30, 2010 | Crate Music

1 Answer

Crate Bass Amp B100 - No sound.


Do you happen to have another speaker that you could hook up to speaker output? This would bypass the amps internal speaker and lf you get sound from that setup, it would mean either a jack failure or possible internal speaker problems. Please let me know.

Jan 24, 2010 | Crate Music

1 Answer

I have a Crate GT 15, not getting anything to the speaker when I plug in.


Do you have electronics experience? Inspect the amp for broken or cold solder joints and any burned components. Check to see if the fuse blew and that the output IC's or transistors (not sure what Crate used in these) are not bad. Check your speaker wire as well.

Jan 15, 2010 | Crate FlexWave FW15 Guitar Amp Combo, 15...

1 Answer

Crate bass amp bt220 limit led is flashing with the volume only at half


You can reach the limiting IRRESPECTIVE of where the volume control is set when you have a guitar or other source that has HIGH output.

Guitars that have battery in them with internal amplifiers are an example of a high output guitar. Plain inductive pickups may require the volume control to be set at say 70% to reach limiting.

Please NOTE that the volume control is NOT linear, but is an "audio taper".

Limiting means you are probably driving it too hard. Many learn the hard way when speakers and thee power amp fail.

When the cone is driven too far beyond the pole pieces of the magnet, then the IMPEDANCE of the speaker becomes relatively low and can damage the power amp. The limiter tries to prevent this by sensing the current and or voltage and will back off the gain internally. This causes distortion when it happens.

Dec 14, 2009 | Crate Music

1 Answer

Crate amp blew a house fuse and stopped working. pilot light still works and I can get a distorted signal through the headphones if I play a guitar very loudly through it.


When a piece of equipment causes a fuse to blow or a breaker to trip, it normally means something in the equipment's circuit was shorted. Either because of heat, moisture, a loose screw, loose wire, loose part, a bug, etc. For safety reasons, don't plug it back in and take it to a repair shop.

Hope this helps!

Jun 04, 2009 | Crate Music

1 Answer

Distortion stoped working on my amp


Hi there. Sounds like the distortion foot switch is stuck. Try a shot of WD-40 where the button goes into the switch and then click it on and off a bunch of times.
Thanks
Paul

May 28, 2009 | Music

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