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Old 12th October 2011, 04:08 AM   #1
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Default Rockford Punch 100ix

Hello everyone. Kinda stumped on this 100ix.

Issues include no sound from right channel or left channel at low volume. Upon increasing volume the left channel gets sound but is extremely distorted and cutting in and out.

R157 is getting extremely hot and almost desoldering itself.

The amp is producing rail voltage of +32vdc/-32vdc

The regulators are producing +/- voltage

All of the op-amps have +/- supply voltage

There is no DC present on the bridging terminals

The amp will bias fine both channels

The amp idles fine with no current draw

I believe both channels to be oscillating but not 100%

LM339 reads as follows:

Pin1 : 4.76 vdc
Pin2 : 4.77 vdc
Pin3 : 14.04 vdc
Pin4 : 1.809 vdc
Pin5 : 2.558 vdc
Pin6 : 4.36 vdc
Pin7 : 5.00 vdc
Pin8 : 3.300 vdc
Pin9 : 2.933 vdc
Pin10: 4.99 vdc
Pin11: 8.21 vdc
Pin12: 0.001 vdc
Pin13: 4.76 vdc
Pin14: 0.101 vdc

The TL594C reads as follows:

Pin1 : 1.285 vdc
Pin2 : 2.300 vdc and amp squeels while touching probe to this pin
Pin3 : 3.546 vdc
Pin4 : 0.005 vdc
Pin6 : 3.470 vdc
Pin7 : 0.001 vdc
Pin8 : 14.03 vdc
Pin9 : 0.290 vdc
Pin10: 0.296 vdc
Pin11: 14.03 vdc
Pin12: 14.03 vdc
Pin13: 3.61 vdc
Pin14: 4.99 vdc
Pin15: 4.99 vdc
Pin16: 0.001 vdc

Hoping someone can give me some direction on this amp.
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Old 12th October 2011, 04:16 AM   #2
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The board number is PC-0695-C

I have included a pic of the board.
Attached Images
File Type: jpg 100ix board 001.jpg (992.3 KB, 66 views)
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Old 12th October 2011, 04:19 AM   #3
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What happens if you set the treble to the minimum position or set the crossover to low pass?
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Old 12th October 2011, 04:30 AM   #4
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Setting the treble pot to minimum seems to make no difference.

Changing to low pass makes the left channel seem to play fine and the right channel plays but is distorted.

R157 no longer gets hot either.
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Old 12th October 2011, 04:56 AM   #5
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Do you have a clean signal on both channels at the positive terminals of C109 and C209?
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Old 12th October 2011, 05:10 AM   #6
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This amp is acting crazy.

When playing a 100HZ test tone to view signal the left channel has no sound but the right channel does.

The signal at C209 looks perfect and clips as it should.

The signal at C109 is considerably weaker and needs much more volume but will not clip even at full volume.

The scope settings are 5v/2ms
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Old 12th October 2011, 05:12 AM   #7
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Is the bass set to the lowest position?

Are the gains for both channels at the maximum position?
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Old 12th October 2011, 05:13 AM   #8
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Yes to both questions.
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Old 12th October 2011, 05:18 AM   #9
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How do the signals compare at pins 1 and 7 for the 3 op-amps in the preamp section?
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Old 12th October 2011, 05:39 AM   #10
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This is strange.

U201 pins 1 and 7 have good clean matching signal and clip about 2 div above and below the base line.

U101 pin 1 looks and clips the same as pins 1 and 7 of u201.

U101 pin 7 seems to have less signal and clips only 1 div above and below base line.

U7 pin 1 same as pins 1 and 7 of U201.

U7 pin 7 has seems to have less signal about 1 div above and below baseline but does not clip even at full volume.

The left channel has intermittant audio and is a clean signal on the scope when it does at the bridging treminal.

The right channel has signal at the bridging terminal but the signal only goes above the base line and the output is considerably higher when listened to through a speaker.

Am I explaining this right or am I just confusing things? This amp is acting very strange.
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