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Old 22nd October 2010, 11:20 PM   #1
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Default Crunch GP3000

I put all new outputs in this amp and a brand new driver board.

Amp powers up and produces + - Rail voltage (115 volts)

Amp also produces + - 15 volts on all op-amps

Relays kick on but amp had no output


Could it possibly be a bad solder joint somewhere Do i need to trace it back to where i lose signal ??

Or any ideas where to check?
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Old 22nd October 2010, 11:29 PM   #2
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I think there's a transistor used for muting between the output inductors and the driver board. It may be defective.

Where did you buy a new driver board?
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Old 22nd October 2010, 11:49 PM   #3
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I bought 1 from Sundown audio The SAZ3000 amp uses the same driver board as the crunch gp3000 . Its a 3640 driver board.

I heard cadence also will sell them And i may have another source for them as well but still checking into that
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Old 22nd October 2010, 11:53 PM   #4
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The voltages i get from the D1302 transistor are

Leg1:-114.8

Leg2:-52.4 and climbs up and down

Leg3:-114.5

Does this appear to be defective?
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Old 23rd October 2010, 12:04 AM   #5
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I think you need to remove it and test it out of the circuit.
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Old 23rd October 2010, 12:21 AM   #6
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If i set the meter to ohm this is what i get

1-2:OL

1-3:35.94 and then climbs up and down wont lock on a number

2-3: 35.98 then climbs up and down wont lock on a number either

Probes reversed OL in all posistions


If i power up the amp without it and test for output will i damage the amp??
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Old 23rd October 2010, 12:31 AM   #7
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35.9 or 34.9K?

This is used to shut down the amp if there is a problem. If the amp is otherwise in good working order, removing the transistor would be safe. If there is a problem causing the amp to pass excessive current through the outputs and the amp is being shut down for a good reason, removing the transistor could cause extensive damage.
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Old 23rd October 2010, 01:54 AM   #8
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35.9 ohms

With it removed still have no output

Last edited by mike49504; 23rd October 2010 at 01:56 AM.
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Old 23rd October 2010, 02:27 AM   #9
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Is the amp producing rail-rail oscillation on the output transistors?

39.5 doesn't seem right because you read OL with the leads reversed. It's also rare for a handheld multimeter to read ohms to 2 decimal places. This probably isn't an issue here but could have you chasing problems that don't exist. If the meter didn't read k ohms, turn it off then back on to make sure the k character on the display is working.
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Old 23rd October 2010, 02:38 AM   #10
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how do i test to see if it has rail to rail oscillation?
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