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Old 8th March 2011, 12:14 AM   #1
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Join Date: Jun 2002
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Default Rockford Punch 301m

The board # is PC-4309-H

I need the following values to these listed parts, they are blown to bits beyond recognition:


R37
Q112
Q113
R173
R50
R33
R45
R153, R198, R154, R183, R104, R186
Q10
Q107
R156
R149
R146

This what i physically see blown/cooked and cannot make out.

who knows what else is bad. probably all the outputs too.
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Old 8th March 2011, 01:48 AM   #2
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Email me if you want the schematic diagram.

babin_perry@yahoo.com
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Old 8th March 2011, 09:57 PM   #3
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Got everything done, but now i am having a serious issue.

The 9540 output side is working normally. the IRF540 side is blowing the fets. there is +25V between G and S

Further troubleshooting reveils that the bases of Q12/Q13 is only -13v. While Q10/11 is +37v

Tracing even further back, Q116 isnt turning on, it appears to be a current source? not sure. But it isnt turning on. Therefore, i am not getting the -37v where there is only -13v

any ideas? i checked all remaining resistors and transistors, comming up empty.
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Old 8th March 2011, 10:09 PM   #4
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How much current is is drawing before the transistors fail?

Does it blow them if they're clamped to the heatsink?

Is there any DC on the positive speaker terminal? If so, is it positive or negative (black probe on the amp ground)?

What's the rail voltage?
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Old 8th March 2011, 11:03 PM   #5
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rail voltage is +/-40v

I did more troublehsooting, the BIAS transistor Q109 isnt turning on, so about 2 to 4 seconds after powerup, the entire bias circuit pulls negative. -13v forcing the IRF540s past thier gate specs.

The gates start off about 0v. then when the bias circuit snaps negative, the vGS shoots to +25v which blows the IRF540s.

DC doesnt become present until 540s short at poweron.

I have the outputs removed from circuit. the IRF9540 section of the amplifier is working perfect.

I cannot find Q110 anywhere, so theres a chance this schematic may not be correct.
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Old 8th March 2011, 11:11 PM   #6
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Also Q109 was one of the blown ones, in the BIAS network. i replaced it already.
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Old 8th March 2011, 11:35 PM   #7
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i tried replacing Q111, made no difference. its collector starts at 0v and snaps to -13v.
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Old 9th March 2011, 12:39 AM   #8
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I removed Q111 to stop the BIAS circuit from getting its negative source, it allows the IRF540s to run without getting blown. But no audio from that half of the amp, still no negative half of the wave on the output.

Sooooo, i noticed it has 2 sets of differential drivers. My guess is one of them is toast. the transistors are statically checking ok, same with the resistors, but i guess that dont mean it isnt breaking down under load.
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Old 9th March 2011, 02:20 AM   #9
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If you lift D104? (connected to Q116?), do you get the bottom half of the waveform?

The ?s are because the numbers are hard to read.
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Old 9th March 2011, 04:09 PM   #10
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I am at a loss. Here is the scope shots, I am using a 1.25Khz Sine Wave as an input signal.

These are AC measurements. DC is too far off the scale over signal. So i cant really measure.

The input signal is shown, the rest are taken off of the collectors of Q102, Q103, Q104, Q105 which is the differential setup.

I replaced ALL transistors. problem still exists.
Attached Images
File Type: jpg Input Signal.JPG (952.0 KB, 22 views)
File Type: jpg Q102.JPG (964.2 KB, 20 views)
File Type: jpg Q103.JPG (890.4 KB, 17 views)
File Type: jpg Q104.JPG (901.5 KB, 17 views)
File Type: jpg Q105.JPG (947.2 KB, 17 views)
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