No sound on one channel

rmittendorf · 20th June 2010, 06:44 PM

I have pyramid 2600 amp. Sound only comes out one side. Have switched speakers wires and the speakers are fine. Where should I be looking on the circuit board to trouble shoot?

Netlist · 20th June 2010, 07:53 PM

What about the inputs? Have you switched them?

/Hugo

gootee · 20th June 2010, 08:28 PM

Since there are two channels, you can compare measurements between points and pairs of points in the bad channel to the corresponding points and pairs of points in the good channel. You could start with the unit unplugged and measure resistances between pairs of pins of the power transistors.

rmittendorf · 21st June 2010, 12:04 AM

Great... Thanks for the advice... i will check everything suggested

smartx21 · 21st June 2010, 02:11 AM

If power is on, you may compare VOLTAGES, starting with power supply (if separate).
Search for a ground point (easier if common to both channels) and select some other points to compare, with no input signal. Check fuses also.
It can be a faulty power supply, or even burnt output transistors.
Good luck!
Max.

20th June 2010, 06:44 PM	#1
rmittendorf diyAudio Member Join Date: Jun 2010	No sound on one channel I have pyramid 2600 amp. Sound only comes out one side. Have switched speakers wires and the speakers are fine. Where should I be looking on the circuit board to trouble shoot?

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20th June 2010, 07:53 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	What about the inputs? Have you switched them? /Hugo

20th June 2010, 08:28 PM	#3
gootee diyAudio Member Join Date: Nov 2006 Location: Indiana Blog Entries: 1	Since there are two channels, you can compare measurements between points and pairs of points in the bad channel to the corresponding points and pairs of points in the good channel. You could start with the unit unplugged and measure resistances between pairs of pins of the power transistors.

21st June 2010, 12:04 AM	#4
rmittendorf diyAudio Member Join Date: Jun 2010	Great... Thanks for the advice... i will check everything suggested

21st June 2010, 02:11 AM	#5
smartx21 diyAudio Member Join Date: Mar 2010 Location: Santiago, RS/ Brasil	If power is on, you may compare VOLTAGES, starting with power supply (if separate). Search for a ground point (easier if common to both channels) and select some other points to compare, with no input signal. Check fuses also. It can be a faulty power supply, or even burnt output transistors. Good luck! Max.