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Old 5th November 2009, 06:30 AM   #11
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Location: Louisiana
With your meter on ohms, do you read infinite resistance from leg 1 to the other legs of the FETs you removed?
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Old 5th November 2009, 01:31 PM   #12
fongman is offline fongman  United States
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Leg 1 reads infinite but leg 2 reads 10 to 15 m ohms
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Old 5th November 2009, 03:29 PM   #13
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Try it again but this time, place the black probe on chassis ground.

Q225
Leg 1:
Leg 2:
Leg 3:

Q215
Leg1:
Leg 2:
Leg 3:

Q219
Leg1:
Leg 2:
Leg 3:

Q224
Leg1:
Leg 2:
Leg 3:

Are there any burned SMD resistors near the bias pot? The ones marked 200 are the ones you need to check. Are they within tolerance?
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Old 5th November 2009, 06:32 PM   #14
fongman is offline fongman  United States
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Q225
Leg 1: -32.7
Leg 2: 32.47
Leg 3: -32.29v

Q215
Leg1: -32.7v
Leg 2: 32.47v
Leg 3: -32.29v

Q219
Leg1: 32.47v
Leg 2: 32.47v
Leg 3: 14.79v

Q224
Leg1: 32.47v
Leg 2: 32.47v
Leg 3: 14.79 v
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Old 5th November 2009, 06:59 PM   #15
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Are you using the numbering scheme shown in the attached image?

224 and 219 should have + rail on leg 3.
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File Type: gif diytransistor.gif (2.6 KB, 47 views)
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Old 5th November 2009, 08:26 PM   #16
fongman is offline fongman  United States
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Sorry i had them in the wrong place, but i have them like it would be on the amp.

Q225
Leg 3: -32.29
Leg 2: 32.47
Leg 1: -32.7v

Q215
Leg 3: -32.29v
Leg 2: 32.47v
Leg 1: -32.7v

Q219
Leg 3: 32.47v
Leg 2: 32.47v
Leg 1: 14.79v

Q224
Leg 3: 32.47v
Leg 2: 32.47v
Leg 1: 14.79 v
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Old 5th November 2009, 08:33 PM   #17
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Location: Louisiana
Is Q221 shorted?
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Old 5th November 2009, 08:46 PM   #18
fongman is offline fongman  United States
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I can not find it? how to test it?
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Old 5th November 2009, 08:57 PM   #19
fongman is offline fongman  United States
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Im using a 100ix schematic. Are they the same
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Old 5th November 2009, 09:44 PM   #20
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I don't know where the transistor is but it's likely near the bias pot.

I don't know if it's the same as the ix. I have the x2 schematic. Email me if you want it.

babin_perry@yahoo.com

Go to the following page and click the circled link. Read the circled text also. Send me the screen cap for Q221.

Basic Amplifier Repair - Transistor Test Applet Link
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File Type: jpg testinstructionssmd01.jpg (67.9 KB, 43 views)
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