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Old 1st March 2011, 04:26 PM   #1
91h22a is offline 91h22a  United States
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Default Xtant X604 Repair

So I have a x604 Amplifier here and It amplifies Left and Right Rear channels just fine. Left Front Channel and Right Front channels are a different story.

When I hook my function generator to Left front there is little amplification (gain set to min, DC 0.00v on all channels) out of the Left Front +- output terminals. But when I look at the Right Front +- output terminals-input still connected to Left Front- I have amplification of Left's input...It seems there is huge "crosstalk" (for lack of better word) between the channels. Is there anything common to this amp that might cause this? I appreciate any help/advice in advance.
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Old 1st March 2011, 10:44 PM   #2
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Are the jumpers set as shown in the attached photo?
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Old 1st March 2011, 11:32 PM   #3
91h22a is offline 91h22a  United States
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no. Balanced inputs defeated and gain is 0dB. I hope the attached image helps.

Also in the second image the LM311N (u22) circled, Its waveform on pin 2 and 3 do not match the 311 to the left(u21). they look to be garbage/noise. I looked at your tutorial's waveform of a x603 and u21 matches u22 does not. Thank you again for your help Mr. Babin.
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File Type: jpg lm311.jpg (114.1 KB, 79 views)
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Old 1st March 2011, 11:38 PM   #4
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If you set them as shown in the photo I posted, does the audio section of the amp work properly?
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Old 1st March 2011, 11:42 PM   #5
91h22a is offline 91h22a  United States
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no it does not. When I have signal into Left Front input signal is amplified at max on right front and seems to be minimal on left.
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Old 1st March 2011, 11:50 PM   #6
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Compare the audio signals on the muting transistors (J108s?) at the input to the power amplifier circuit for each of those channels. Is the signal reaching the right front channel significantly greater than the signal reaching the left front channel?
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Old 2nd March 2011, 12:22 AM   #7
91h22a is offline 91h22a  United States
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Ok so I did not even make it as far as the muting circuit. In the first image below here is what all of the inputs look like without signal...it measures -1.04dc with no signal.

The second image, was verified before connection, perfectly good sine wave at the input.

So what do you make of this?
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File Type: jpg connected.jpg (54.8 KB, 69 views)
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Old 2nd March 2011, 02:24 AM   #8
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What frequency is this. It appears to be ~20kHz.
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Old 3rd March 2011, 12:43 AM   #9
91h22a is offline 91h22a  United States
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It was taken at 10 kHz. I was working with 1 kHz but must've hit the 10..
so the signal is very weak at the muting transistor for the left channel (the channel I was inputting to) and distorted. The right muting transistor had the signal,while having no direct input, and was also very distorted.
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Old 3rd March 2011, 12:46 AM   #10
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Try 100hz. Set the crossovers flat.
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