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NAD C352 Protect mode
NAD C352 Protect mode
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Old 12th June 2021, 07:32 AM   #61
Rick PA Stadel is offline Rick PA Stadel  United States
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Trace the +18V from where it leaves the regulator board, and start disconnecting stuff until you find where that 123mA is going (0,5W @33 ohms = 4,06V / 123mA).

Do I understand correctly that the Volume motor drive still works EVEN WITH R245 open?

So some of those 8 traces that go off the page, bottom of page 6, only two of which have a signal name, are going to need sorting!

Sorry, this is going to have to do it for me tonight (02:33 in the morning locally). Will check back first thing tomorrow.

Cheers
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Old 12th June 2021, 08:13 AM   #62
Lynyrd is offline Lynyrd  France
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Yes Volume motor drive still works EVEN WITH R245 open
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Old 13th June 2021, 02:04 AM   #63
Rick PA Stadel is offline Rick PA Stadel  United States
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Any news yet on the destinations of those 8 traces that go off page 6 to the right?

A couple are labeled -- Trig and I/V -- but not sufficiently that I can sort it.

Regards

Last edited by Rick PA Stadel; 13th June 2021 at 02:12 AM.
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Old 13th June 2021, 04:15 AM   #64
Lynyrd is offline Lynyrd  France
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Its difficult for me
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Old 13th June 2021, 06:34 AM   #65
mdardeniz is offline mdardeniz  Turkey
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What is the hstory of c352? like, 2nd hand, droped, gived wrong voltage (220v or 110v). can you post a picture?



Did you solved +-50v supply voltage difference?


R245 in manuel 1/2 watt. Use 1watt? But, voltage over d119 must be near 18volt. Is it? If not you can control transistors there. Here +-18 volt supply for preamplificator. Preamplificator may be fault.
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Old 13th June 2021, 12:20 PM   #66
Lynyrd is offline Lynyrd  France
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What I need doing
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Old 13th June 2021, 02:18 PM   #67
Lynyrd is offline Lynyrd  France
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Please....
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Old Today, 07:11 AM   #68
Rick PA Stadel is offline Rick PA Stadel  United States
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Join Date: Apr 2017
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OK, if you aren't willing or able to trace the +18V power leaving the 18V regulator section (as described in post 61 IIRC), let's start by unplugging the preamps. On the board with all the relays and input RCA's, locate M301 and M302 and unplug them. This will eliminate the preamps from drawing current. Then replace R245, again, and see if the regulators function.

Cheers
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