Rockford Punch 100ix

Perry Babin · 2011-10-18 7:22 am

Is R270 within tolerance?

Check Q208 and Q216.

seankane · 2011-10-19 3:35 am

Perry Babin said:
Is R270 within tolerance?

Check Q208 and Q216.

R270 is within tolerance and I replaced Q208 and Q216 with new parts and same result extremely distorted audio.

seankane · 2011-10-19 3:36 am

Q214?

Perry Babin · 2011-10-19 3:49 am

Has Q228 been damaged again (greater than 1v DC with the black probe on the emitter and the red probe on the base)?

seankane · 2011-10-19 3:58 am

Perry Babin said:
Has Q228 been damaged again (greater than 1v DC with the black probe on the emitter and the red probe on the base)?

I dont think so, RP on base and BP on emitter I read -0.566 vdc

Something I wanted to mention. Looking at the data sheets for the 3S and the G1 the collector, base, and emitter are in different locations.

What do you think about that?

Perry Babin · 2011-10-19 4:04 am

They both cross to an MMBT5551. Post links to the datasheets that show them being different.

seankane · 2011-10-19 4:17 am

The SMD Code Book

Look on this and see what (G1) you think the 100ix uses. The data sheet I looked at from alldatasheet.com shows the 3S and the G1 having different configurations, depending on what (G1) you pick.

seankane · 2011-10-19 4:19 am

The marking the 100ix uses is (G1z)

Perry Babin · 2011-10-19 4:32 am

I can't find the datasheet for a G1z.

Did you check the two transistors with a multimeter to confirm that the pin configuration was different?

seankane · 2011-10-19 4:53 am

How do I determine that?

Perry Babin · 2011-10-19 5:57 am

Check the one you're using as a replacement with your meter to see if the pin configuration is correct. I don't know of any SOT-23 transistor used in any Rockford amp that had a configuration different from the standard transistors.

seankane · 2011-10-20 3:20 am

They are the same.

Perry Babin · 2011-10-20 5:59 pm

Is the bottom half of the waveform still missing?

seankane · 2011-10-21 2:19 am

Yes the bottom half of the waveform is still missing.

seankane · 2011-10-21 3:32 am

Hey Perry I found D201 and Q212 to be faulty. I replaced them both and the amp works beautifully. Thanks for all your help.

Perry Babin · 2011-10-21 3:37 am

With Q212 defective, I would not have expected the bias to work. D201 shorted should have killed the signal. Open, it shouldn't have caused any problems.

seankane · 2011-10-21 3:45 am

Perry Babin said:
With Q212 defective, I would not have expected the bias to work. D201 shorted should have killed the signal. Open, it shouldn't have caused any problems.

Well thats kinda what I was thinking but since the bias pot was affecting the sound so much I decided to check Q212.

Maybe D201 was shorted in a way that it just partially killed the signal, the lower half of the waveform?

Perry Babin · 2011-10-21 3:51 am

On the first post, you stated that the bias worked properly on both channels. Did that change at some point?

seankane · 2011-10-21 3:58 am

It must have and I didnt catch it. I replaced several components without re-checking the little stuff like that. Maybe I should have and that would have saved us alot of time. I am not sure at what point that changed.

Next time I will be sure to make you aware of ANY changes.

seankane · 2011-10-21 6:22 am

Hey Perry I forgot to tell you I have not re-installed the two protection transistors yet. I forgot about them.

I was working on 3 other amps at the same time and spaced it. I will put them back in tomorrow and re-test the amp. I would assume since it is working fine now it will probably work fine with them in.

If it does not then there is other problems.

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