Rockford Punch 100ix

seankane · 12th October 2011, 04:08 AM

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.

seankane · 12th October 2011, 04:16 AM

The board number is PC-0695-C

I have included a pic of the board.

Perry Babin · 12th October 2011, 04:19 AM

What happens if you set the treble to the minimum position or set the crossover to low pass?

seankane · 12th October 2011, 04:30 AM

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.

Perry Babin · 12th October 2011, 04:56 AM

Do you have a clean signal on both channels at the positive terminals of C109 and C209?

seankane · 12th October 2011, 05:10 AM

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

Perry Babin · 12th October 2011, 05:12 AM

Is the bass set to the lowest position?

Are the gains for both channels at the maximum position?

seankane · 12th October 2011, 05:13 AM

Yes to both questions.

Perry Babin · 12th October 2011, 05:18 AM

How do the signals compare at pins 1 and 7 for the 3 op-amps in the preamp section?

seankane · 12th October 2011, 05:39 AM

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.

12th October 2011, 04:08 AM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	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. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

12th October 2011, 04:19 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What happens if you set the treble to the minimum position or set the crossover to low pass? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th October 2011, 04:30 AM	#4
seankane diyAudio Member Join Date: May 2010 Location: Washington State	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. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

12th October 2011, 04:56 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have a clean signal on both channels at the positive terminals of C109 and C209? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th October 2011, 05:10 AM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	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 __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch


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12th October 2011, 05:12 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is the bass set to the lowest position? Are the gains for both channels at the maximum position? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th October 2011, 05:13 AM	#8
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Yes to both questions. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

12th October 2011, 05:18 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	How do the signals compare at pins 1 and 7 for the 3 op-amps in the preamp section? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

12th October 2011, 05:39 AM	#10
seankane diyAudio Member Join Date: May 2010 Location: Washington State	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. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

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