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Old 31st October 2010, 04:33 AM   #21
Dr Zeus is offline Dr Zeus  United States
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Got it. Just checked input/output and opAmps with the OScope. This amp is FIXED

Solution/Parts:

1 x 1N4003 Diode at D7 (Radioshack part!)
1 x length of thin wire to fix trace from next to R104 to near C123
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Old 31st October 2010, 04:45 AM   #22
Dr Zeus is offline Dr Zeus  United States
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Looks like my other Rockford Punch 60x2 has this same exact problem. Supposedly these two amps came out of the same car/setup. I guess they were both put through the mill together.
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Old 31st October 2010, 05:29 AM   #23
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It's likely that the previous owner allowed a 12v power source to contact the RCA shields. It probably damaged his head unit also.
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Old 21st March 2011, 03:51 AM   #24
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Hi.I got broken amp punch 60x2.Same like you got.If you kan tel me some information.I kant read numbers of the CR1 ,CR2,Q6,Q7.Please help me.
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Old 21st March 2011, 05:47 AM   #25
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Quote:
Originally Posted by kuzhalevich View Post
Hi.I got broken amp punch 60x2.Same like you got.If you kan tel me some information.I kant read numbers of the CR1 ,CR2,Q6,Q7.Please help me.

Hello Q6 and Q7 originally were MTP50N06V which can be found on ebay. You can use those again but I recommend IRF3205. The gate drivers for those originally were 68 ohm (805) size. Perry mentioned those my be a bit high for the IRF3205 and to use a 47 ohm (805) size. I personally have used 68 ohm in many repairs with the IRF 3205 and have NEVER had any issues. CR1: FEN16BT 9612 CR2: 9629 U1610 These are OEM parts.

Replace CR1, CR2, Q6, Q7, R19, D3, D2, Q1, Q2, Q4, Q5, then before powering up turn bias pots fully counter clockwise. Check Q119, Q115, R150, R152, R136, R163, Q215, Q219, R250, R252, R236, R263. If those check out ok fire it up. Then set bias and test your sound. Hope this helps...
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Old 21st March 2011, 10:24 AM   #26
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I recommend the 47 ohm resistors because they're always safe. The 68s can be marginal on some amps. There are no amps (that I know of) that use anything greater than 47 ohm resistors with 3205s unless there is some additional deadtime built into the drive circuit (i.e. Kicker).

Sometimes it's not apparent that the gate resistor value is too high in amps that use regulation (like many of the Rockford amps) because the reduction in pulse width at idle masks the problem.

In my opinion, it's well worth the time and expense to replace the gate resistors.
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Old 21st March 2011, 07:38 PM   #27
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Well said.
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Old 9th August 2011, 06:10 PM   #28
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Hi.Thank you so mutch for information.Really helpful.I cent find cr1 and cr2.Any replacement for those?
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Old 9th August 2011, 07:04 PM   #29
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Start a new thread. In the thread, include the PC-# on the board.
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Old 26th November 2011, 12:24 AM   #30
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Haw?I newer did this.Would you help me?
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