20 Most Recent Crate Cfs2 2 Button Footswitch (For Amps) - Page 5 Questions & Answers


A possible problem MIGHT be marginal switch contacts on the external foot controller cable. If you are not using the foot pedal, these contacts must maintain contact to keep the same channel selected.

Crate Music | Answered on Sep 20, 2010


Power light means very little. If unit has a preamp output, plug a set of headphones into it and see if you can hear anythin going through. (it will be weak). If you can, the power amp section is bad. Take in for service.

Crate Music | Answered on Mar 29, 2010


NEVER use switch cleaner such as DeOxit on pots !!!!!

I have used CRC226 available at Home Depot electrical dept.

I SUSPECT that the resistance element in that pot is cracked. This is common if the knob sustained a hit. Replacing the pot is the only cure if the element is cracked.

Reviewing the schematic, ALL audio passes through the wiper on the HIGH tone pots. If the wiper is intermittent, so will be the sound.

If your unit is solid state amp, the pot looks like a 10K ohm LINEAR taper.
If you have a tube type, then the pot is a 250K ohm LINEAR.

Note that the other tone pots in the units are AUDIO tapers, but the high is a linear taper.

Get repair parts from either DigiKey.com or Mouser.com

Crate Music | Answered on Mar 23, 2010


Looking over the schematic I see all sorts of poor design. The reverb is driven by IC TL072 chip and the output is received by the same.

This chip is supplied with +/- 15.5 volts UNREGULATED which is stupid! If you get a power surge, the IC will be destroyed. Myself I would put at least a shunt Zener regulator on these voltages. Use a 100 ohm resistor in series and Zeners to ground for both the plus an minus 15.5 lines.

First thing check those 15.5 volt... the plus is on C23 pos term and the neg is on C24 neg term.

They have a 1 meg resistor to ground from pin 3 of the chip to bias the + input of the chip. This is TOO big as the input leakage current can be too much. I would reduce this resistor to 220K and increase C22 to 0.0047 mfd.

Check the DC voltage at pin 1 of the chip (IC1). It should be VERY near zero.

The output buffer for the reverb has better design. Check for zero volts or very near it on pin 7 of the chip. Be careful not to short to pin 7 which is pos 15.5.

If either of the above tests show a voltage over 0.5 volts from ground, replace the TL072 chip as it is likely fried by power surge..

Since there is high voltage (320 volts) use great caution when working on this amp.

Crate Music | Answered on Mar 15, 2010


Check for bad tube... it HAPPENS that brand new ones fail... USUALLY if they last 50 hours, they will last for the expected life. The bad tube would likely NOT be the main power tubes, as the amp would still run on one cylinder...

Crate Music | Answered on Feb 02, 2010


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.

Crate Music | Answered on Jan 31, 2010


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.

Crate Music | Answered on Jan 24, 2010


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.

Crate Music | Answered on Dec 14, 2009


Are you getting sufficient power to the amp?

Could be a loose connection inside the amp (such as a wire), a bad component, or a severed ground. Many possibilities here. If you know electronics, take a multimeter and start testing all the components. Look for any burn marks, check for broken solder connections, and continuity test all wires. Be careful since amps can hold a deadly voltage for a good while. Be sure to drain the capacitors before doing anything else inside it. If you do not feel comfortable doing this, you can take it to a electronics repair person. Keep in mind that Crate is one of the harder amps to fix because most of their components are surface mount.

Crate Music | Answered on Nov 24, 2009


The switch that is a part of the effects loop jack is making poor contact.

Open the unit and ALSO check the soldering of the jack pins.

MANY of these have a contact as part of the strip that contacts the plug. This spring strip often gets weakened and doesn't contact the metal contact below. The contact "forwards" the preamp to the power amplifier. If the contact doesn't quite make, no power will get to the power amp. If the jack is bad, you MIGHT also try a jumper plug. You MIGHT be able to bend the contact to get moore force as a repair.


If it is a mono 1/4 jack, then use a short jumper from the FX send to the return is another non-invasive fix..

IF it is a TRS type effects loop, plug in a plug that has the Tip and the Ring jumpered in the plug as a quick fix.

In general the jacks in these guitar amps are JUNK !!!

Crate Music | Answered on Oct 10, 2009


grounding it,and encasing the box in foil and grounding the foil

Crate Music | Answered on Sep 01, 2009

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