protect light is on can you help?

lilchriscustoms · 16th May 2007, 07:13 AM

I have a Kenwood 923 2ch amp and a crunch 3004 4ch amp and they both have the protect light on i looked inside everything looks fine (no burns no caps blown apart i don't know) everything looks fine can someone help me i also have punch 150 old school that 1ch works fine and the other is distorted i opened it and one cap is blow apart so i think i have to replace that wright? thanks for the help......Chris

djk · 16th May 2007, 09:14 AM

The Punch 150 with the blown cap probably has a blown fuse and/or output on the same channel.

If you mess with taking an output off, be careful. If you scratch the heatsink then you have to add insulators.

gmphadte · 17th May 2007, 05:24 AM

Have u powered them after long or from storage.

lilchriscustoms · 18th May 2007, 12:44 AM

yes just the other day

gmphadte · 18th May 2007, 08:53 AM

U have powered the unit after long storage, then...
u have to physically inspect the unit(s) for any bugs' outputs(liquid or solids) on the pcbs. These tend to conduct and the circuits will misbehave. The tracks will corrode and open. Check for green corrosion on the tracks.
If the storage was at considerably higher humidity levels/place, then u have to use a hot air blower and heat the pcbs with the power chord disconnected. Wait for it to cool down and then test.
Electrolytic capacitors on long storage tend to dry and fail on sudden power-up. U couldn't have avoided this anyhow.

Gajanan Phadte

16th May 2007, 07:13 AM	#1
lilchriscustoms diyAudio Member Join Date: May 2007	protect light is on can you help? I have a Kenwood 923 2ch amp and a crunch 3004 4ch amp and they both have the protect light on i looked inside everything looks fine (no burns no caps blown apart i don't know) everything looks fine can someone help me i also have punch 150 old school that 1ch works fine and the other is distorted i opened it and one cap is blow apart so i think i have to replace that wright? thanks for the help......Chris

16th May 2007, 09:14 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	The Punch 150 with the blown cap probably has a blown fuse and/or output on the same channel. If you mess with taking an output off, be careful. If you scratch the heatsink then you have to add insulators. __________________ Candidates for the Darwin Award should not read this author.

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17th May 2007, 05:24 AM	#3
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	Have u powered them after long or from storage.

18th May 2007, 12:44 AM	#4
lilchriscustoms diyAudio Member Join Date: May 2007	yes just the other day

18th May 2007, 08:53 AM	#5
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	U have powered the unit after long storage, then... u have to physically inspect the unit(s) for any bugs' outputs(liquid or solids) on the pcbs. These tend to conduct and the circuits will misbehave. The tracks will corrode and open. Check for green corrosion on the tracks. If the storage was at considerably higher humidity levels/place, then u have to use a hot air blower and heat the pcbs with the power chord disconnected. Wait for it to cool down and then test. Electrolytic capacitors on long storage tend to dry and fail on sudden power-up. U couldn't have avoided this anyhow. Gajanan Phadte

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