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Re: 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.
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Are the internal speakers properly connected via the rear-mounted 1/4 inch "Speaker Output" jack? If so and still no sound, try connecting a separate external speaker (floor monitor, pa cabinet) for a "low volume" test.
The OM says the internal speakers are 4 ohm so it's unlikely that a wiring problem with speaker connections would cause all four to stop working. With AC power disconnected from outlet check for an internal speaker protection fuse BUT be careful. Charged capacitors can hold a charge for weeks!!!
The red light means NOTHING regarding the battery condition... If battery is not new, try a new one.
I have seen several problems... some people get the cables backwards for input and output. The INPUT cable is what turns on the battery and it has to be a mono cable.
ANOTHER common problem with ABUSED pedals is that the jack used for external power adapter gets smashed at some point and cracks the circuit board near it. USUALLY the light will not come on when this happens.
Byond this, it probably requires repair. Some are easy to open and others are a bear to get the circuit board out... key is to NOT force very much when working on these.
does your bass have active pick ups? do the ratings on your amp match the ratings on your speaker? are you using a pedal? does your pedal have an output adjustment? have the ground on your bass checked. make sure you're using the right kind of cable. and be sure that the outlet you're using is grounded.
Since the PA clip is not lit, the problem seems to be up front...
First thing is to look for a bad cable as a broken ground could be putting hum at a clipping level. First thing, test this by unplugging all inputs. If the clipping light goes out, then you have bad cables or a ground loop.
Try sending a line level signal into "Effects return" to test if the power amps are OK.
If the clip light is still on, turn all gain controls down to minimum. If light is still on then take unit for servicing.