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Old 9th February 2009, 08:22 PM   #21
fongman is offline fongman  United States
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pull Q329/30/24/25 and r364 off

r334: 20.5 ohm
r335: 20.5 ohm

r362: 20.5 ohm
r363: 20.5 ohm

out put speaker is 41v

how is it higher now?
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Old 9th February 2009, 08:29 PM   #22
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A leaking output transistor is probably causing the output to be driven toward the rail.
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Old 9th February 2009, 08:44 PM   #23
fongman is offline fongman  United States
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i don't know if you catch the post on eariler but i left 3 irf640 on the board? would that make different?

q218,19,20
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Old 9th February 2009, 09:02 PM   #24
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At this point, none of the outputs need to be in the circuit. They weren't cut loose from the circuit at first to allow you to determine if the drive circuit was intact. Now that you know it's damaged, they can be cut out of the circuit so you can check the rest of the components.

Remember to remove the 0.1 ohm resistors also so they don't interfere with the other components.

With those components out of the circuit, you should read the correct value for most of the rest of the resistors. The value is printed on the top of the resistor. The first 2 digits are the value. The 3rd digit is the multiplier. 101 = 1,0 and 1 zero (100 ohms). 510 is 51 and no zeros (51 ohms).
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Old 9th February 2009, 09:57 PM   #25
fongman is offline fongman  United States
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cut those 3 and now .014v on both speaker output. I think it okay now?
which 0.1 ohm resistors are your referring to?
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Old 9th February 2009, 10:12 PM   #26
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Well... It's not OK. It simply doesn't have 30+v on it.

The large green ones that you've been reading 0.4 across.
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Old 9th February 2009, 10:19 PM   #27
fongman is offline fongman  United States
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I still have 5 on the board. should i take them of too?
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Old 9th February 2009, 10:28 PM   #28
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Yes.
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Old 9th February 2009, 11:22 PM   #29
fongman is offline fongman  United States
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okay now with them off i measure

r333,r334 is 200 and i measure 20 ohm so it should be fine?

r328,r329 1001 and i measure 999 ohm looks okay?

r355,r356 1001 and i measure 999 ohm looks okay?

r362,r363 200 and i measure 20 ohm looks fine?

r377 510 and i measure 51 ohm

I'm checking the rest and see if there are any bad one.
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Old 9th February 2009, 11:29 PM   #30
fongman is offline fongman  United States
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on the 101 i get 100.2
on the 1001 i get 998

are these okay
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