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I need a power supply or a schematic for a signalreach cr100 cell phone amplifier.

Need a power supply or pin out voltages or schematic for a signalreach cr 100.

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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Dec 04, 2014

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Carlsbro Bass Reactor 400 bass amp - power section dead


• Could be drive transistor , output transistor or both on the main amp.

But check for power supply and in the preamps also.

• A signal tracer will come in handy when troubleshooting these kind

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• Measure supply voltages,

• Check offset voltage

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Isolate , and trace afterwards.


• Schematic is really needed when there are burnt and unrecognizable

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I'm not sure what you mean by 'wide open voltage'. If it's over 17v, the supply may have multiple problems. I don't have the 52kx schematic but other Pyramid supplies have over-voltage protection. There is an SCR that is triggered when the voltage gets to ~17v. This should clamp the output and trigger a shutdown. You should check the 16v Zener diode and the SCR. If the SCR or the Zener is defective, that would prevent the over-voltage from clamping the voltage. Also confirm that the SCR has a solid connection to the ground terminal of the supply. If it's open, that could prevent the clamp from shutting down the supply.

If the voltage is going high, measure the DC voltage from pin 4 to pin 5 of the LM723. It should remain the same at all times. Also measure the voltage from pin 5 to the ground terminal of the supply. That should also remain constant at all times.

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Have you done any troubleshooting at this point?

Are you going to try to repair this yourself?

Have you tried to locate a schematic for the supply?

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Need information


Try http://www.servicemanuals.net/

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Most of Pyramid's supplies are based on the LM723 voltage regulator. The DATASHEET should tell you most of what you'll need to know to repair it. THIS is the schematic diagram.

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Soundstream ribcom500


You can get the schematic from SoundStream. If you get the schematic and need help, email it to me at:
babin_perry@yahoo.com

If the amplifier does nothing, post the DC voltage on each of the pins of the SG3525 (or whatever IC they're using in the supply). Use this as a template:

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:

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