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NAD C352 Protect mode
NAD C352 Protect mode
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Old 16th June 2021, 08:23 PM   #91
Lynyrd is offline Lynyrd  France
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Location: France
No pre amp module on board.
I was tested only power amp
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Old 16th June 2021, 08:30 PM   #92
Lynyrd is offline Lynyrd  France
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+18v rail shows 10.8v
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Old Yesterday, 12:41 AM   #93
Rick PA Stadel is offline Rick PA Stadel  United States
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Join Date: Apr 2017
Location: greater Kansas City
Time to follow that trace. Now you don't have to start at the regulator -- you can work away from where it connects to the pre/lineamps.

Any place you find 10.8V, disconnect it; or just find what is getting warm in that area.

Cheers

edit: Almost forgot: The power amp uses the 18V rails, too. (Base bias for the cascode transistors of the input stage, and several other places.) So even though the power amp passes signal -- which is very good -- it isn't altogether in the clear.

Last edited by Rick PA Stadel; Yesterday at 01:03 AM.
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Old Yesterday, 05:23 AM   #94
Lynyrd is offline Lynyrd  France
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Can you help me to narrow the circle of suspects?
Please
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Old Yesterday, 06:50 AM   #95
Rick PA Stadel is offline Rick PA Stadel  United States
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Join Date: Apr 2017
Location: greater Kansas City
Since the provided schematic is incomplete, and blessed with errors (Did they run out of little dots in the drafting department that week, or what?), following the copper in the physical amp is the only way to go.

Stand it up on one end so you can get to the top and bottom alternately, and start tracing. When you find out where those 8 traces that go off-page to the right at the bottom of page 6 go, let us know. There surely are some likely suspects in that circle, since the 18V and 12V regulators both head that way.

Cheers
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Old Yesterday, 07:10 AM   #96
Alexchoi is offline Alexchoi
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Join Date: Oct 2009
I came across C_320 and found it was a simplified design of C_352,
its easier to understand the structure of C_352 by studying this C_320 schematic.

Also C_372 is a higher version, though a bit complicate and voltages are different, the schematic layout is very clear. much easier to trace.

with help of these two schematic, hope it can help you to trace.
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Old Yesterday, 07:33 AM   #97
mdardeniz is offline mdardeniz  Turkey
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Join Date: Mar 2020
Location: istanbul
If you answer my questions. I try to help you (last questions; is zener tested, try series resistors).
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Old Yesterday, 07:42 AM   #98
mdardeniz is offline mdardeniz  Turkey
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Join Date: Mar 2020
Location: istanbul
If you answer my questions. I try to help you (last questions; is zener tested, try series resistors).
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