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Old 6th May 2011, 04:56 AM   #11
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[QUOTE=Perry Babin;2563208]Post the voltage on all three terminals of the following transistors. Place the black meter probe on one of the non-bridging speaker terminals. Place the red meter probe on the point where you need to measure the voltage.

Q128
B: -30.75 vdc
C: 0.000 vdc
E: -37.40 vdc

Q129
B: -32 vdc
C: -37.41 vdc
E: -37.41 vdc

Q118
B: +17.10 vdc
C: +75.2 vdc
E: +18.73 vdc

Q119
B: +16.70 vdc
C: +15.15 vdc
E: +17.00 vdc
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Old 6th May 2011, 05:07 AM   #12
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That should have been the 200 series parts... but, Q129 looks like it may be shorted.

Post the voltage for the 200 series parts next.
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Old 6th May 2011, 05:32 AM   #13
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[QUOTE=Perry Babin;2563208]Post the voltage on all three terminals of the following transistors. Place the black meter probe on one of the non-bridging speaker terminals. Place the red meter probe on the point where you need to measure the voltage.

Q228
B: -34.20 vdc
C: 0.000 vdc
E: -34.72 vdc

Q229
B: -35.36 vdc
C: -37.41 vdc
E: -34.81 vdc

Q218
B: -4.09 vdc
C: +75.2 vdc
E: +1.800 vdc

Q219
B: -4.75 vdc
C: -0.860 vdc
E: +1.950 vdc
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Old 6th May 2011, 07:42 AM   #14
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In the 100 series channel I found R140 and R170 to be way out of tolerance. These 2 are 33 ohm resistors. I replaced them and now the amp wont power up goes into full short and current draw on my power supply.

Any thoughts on why that is?
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Old 6th May 2011, 08:48 AM   #15
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Changed Q128 and Q129 amp is now pulsing from 0 amps to 60 amps bouncing up and down.
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Old 6th May 2011, 08:52 AM   #16
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Changed Q119 and Q118.

After those I powered up and Q117 and D103 blew.

Changed Q117 and D103 now amp powers up and idles with same issue of 17 vdc on bridging terminal of left channel.

I feel I have made no progress changing out the 2 bad resistors R140 and R170.

After I power the amp up the current draw jumps up a little and I hear like a hissing noise or frequency noise from something in that channel.

I dont know what to think?????
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Old 7th May 2011, 12:33 AM   #17
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Any ideas of where I should go next?
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Old 7th May 2011, 01:56 AM   #18
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Let's deal with one channel at a time. If the 100 series channel is causing problems, pull the outputs. Does that allow the amp to power up?
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Old 7th May 2011, 02:26 AM   #19
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I got the amp to power back up read my last 4 or 5 posts to get caught up.
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Old 7th May 2011, 04:16 AM   #20
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Lift Q226 and Q230. Be careful, it may draw excessive current.

If you have any other components out of the circuit in this channel, reinstall them.
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