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Old 26th May 2010, 02:32 AM   #1
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Default Lighting Audio B2-300.4

I must be off my game today. I cant figure this amp out. The amp is stuck in protection mode So i pulled the rectifiers and outputs Amp is still in protection mode.

This is the voltages i got

Tl494
1:0.13
2:0.50
3:.07
4:0
5:0
6:0
7:0
8:1.45
9:0
10:0
11:1.45
12:1.46
13:0.69
14:0.69
15:0.68
16:0

Power supply fets irfz44
1:0
2:13.91
3:0

Any ideas on where to check?
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Old 26th May 2010, 04:48 AM   #2
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Location: Louisiana
Follow the circuit back from pin 12 to a PNP transistor (Q2?). If you can't determine if the transistor is defective, post the voltage on it.
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Old 26th May 2010, 05:52 AM   #3
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Q2: 2n4403

1:1.43

2:2.78

3:0
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Old 26th May 2010, 05:58 AM   #4
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Location: Louisiana
The problem is farther back. The emitter should be near 12v (if the collector is connected to pin 12). Follow it back to see why the emitter doesn't have 12v.
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Old 26th May 2010, 06:14 AM   #5
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it goes back to another 2n4403 and thoose voltages are

1:13.91
2:10.59
3:1.44

do i need to track it back farther then that yet?
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Old 26th May 2010, 06:19 AM   #6
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Location: Louisiana
That one is defective.
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Old 26th May 2010, 06:26 AM   #7
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ok yes i can see that one is defective but still have more issues im gonna follow it back some more
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Old 26th May 2010, 06:34 AM   #8
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Perry,

amp is still stuck in protect mode. This is what i have now

Q2:

1:13.80
2:13.80
3:0

Q3:

1:13.91

2:13.17

3:13.80

TL494

pin12:13.80
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Old 26th May 2010, 07:54 AM   #9
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Location: Louisiana
Those voltages look OK. Post the voltage on all of the pins of the 494.
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Old 26th May 2010, 03:10 PM   #10
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TL494

1:0.98
2:3.66
3:.06
4:.03
5:1.50
6:3.39
7:0
8:11.18
9:4.60
10:4.60
11:11.18
12:13.79
13:4.99
14:4.99
15:4.99
16:0

Power supply fets
1:4.60
2:13.83
3:0
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