Pyramid - PS21KX 20 Amp Power Supply Car Audio Amplifier - Answered Questions & Fixed issues


You're getting 240 volts from a pyramid amp?

Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx


helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_11.png

Pyramid - PS21KX... | Answered on Feb 10, 2018 | 38 views


Yes. Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx

helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_10.png

Pyramid - PS21KX... | Answered on Feb 10, 2018 | 34 views


Say that three times real fast.
Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx

helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_10.png

Pyramid - PS21KX... | Answered on Feb 10, 2018 | 37 views


Yes. Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx

helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_10.png

Pyramid - PS21KX... | Answered on Feb 10, 2018 | 32 views


Cool.
Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx

helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_10.png

Pyramid - PS21KX... | Answered on Feb 10, 2018 | 30 views


That is exactly what the protection light is for.
Recommend contacting a local car audio professional or Pyramid customer support directly here:

http://www.pyramidcaraudio.com/ContactUs.aspx

helpful-j2fqtt4x4km4a1x1cbly0mof-5-0_9.png

Pyramid - PS21KX... | Answered on Feb 10, 2018 | 83 views


Make sure is grounded properly and check the wires, the positive is connected to + and negative to -
I hope this helps.

Pyramid - PS21KX... | Answered on Aug 05, 2012 | 85 views


The problem I have had with a PS-20 is a blown capacitor. Hooked to a radio, would allow radio to receive fine, but when trying to transmit, amperage would bottom out. Behind the transformer is a large circuit board. UNPLUG POWER SUPPLY, remove cover, Undo the two nuts, flip board over, and gently rock the 4700uf capacitors side to side. If they move more than 1/16th of an inch, chances are they are blown. Remove/replace and should be good to go...

Pyramid - PS21KX... | Answered on Feb 06, 2014 | 1,765 views


Bad amp.

Pyramid - PS21KX... | Answered on Dec 12, 2011 | 42 views


Bad amp. Trash. Sorry sugar :(

Pyramid - PS21KX... | Answered on Dec 12, 2011 | 85 views


protection light come on and bets

Pyramid - PS21KX... | Answered on Oct 28, 2011 | 144 views


The out put transistor are cooked and will need to be repair.

Pyramid - PS21KX... | Answered on Dec 10, 2010 | 100 views


I have used this tech for repairing some of my radio equipment and found him to be honest and dependable A rare thing now days. check with him at rmauro218@aol.com. Unless you are wanting to take a shot at repairing it yourself if so I will do some searching myself to see if I can give you a hand on it.

Pyramid - PS21KX... | Answered on Dec 25, 2008 | 300 views


thank you for your help . I have already fixed the power supply I double checked the transisters and found three bad so I replaced all the power transisters and it is fine . thanks again bob

Pyramid - PS21KX... | Answered on Sep 20, 2009 | 432 views


Generally, the fuse only blows when the rectifiers fail. In other Pyramid supplies, they use a square, 4 terminal bridge rectifier. They probably use the same thing in your supply.

Let me know if you have any other questions.

Pyramid - PS21KX... | Answered on Jan 24, 2009 | 368 views


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.

Pyramid - PS21KX... | Answered on Jan 12, 2017 | 404 views


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?

Pyramid - PS21KX... | Answered on Mar 13, 2008 | 210 views


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.

If the output voltage drives the voltmeter to the end of the scale, it likely has one or more shorted power transistors.

Pyramid - PS21KX... | Answered on Jan 13, 2009 | 1,231 views


Over 10 year old messages on a another board referred to expired web sites that are no longer operating.

I saw a reference to the following web site:

http://www.canvaslove.co.uk/pyramid-awning-instructions

Pyramid Car... | Answered on Apr 09, 2019 | 40 views


Request the diagram directly from Pyramid.

Pyramid Car... | Answered on Dec 31, 2018 | 49 views

Not finding what you are looking for?
Pyramid - PS21KX  20 Amp Power Supply Car Audio Amplifier Logo

Popular Tags

20 questions posted

Ask a Question

Usually answered in minutes!

Top Pyramid Car Audio & Video Experts

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1175 Answers

ALPHANSO TAYLOR

Level 2 Expert

80 Answers

Mark Skinner

Level 2 Expert

79 Answers

Are you a Pyramid Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...