Help needed with Preamplifier ML 38S

lumanauw · 18th April 2004, 08:33 AM

I've got problem with Mark Levinson Preamplifier 38S. The volume control is dead at volume 19. Nothing happens if I turn the volume knob up or down. Also cannot adjust balance (which is also with this volume knob).
The sound is badly distorted, at low volume (cannot raise to bigger volume)
I've checked the voltages, the +5, +/-15V are all there. All fuses are OK. It seems like many digital cct inside.

Someone have full schematic to this preamp? Or help repairing it?

lumanauw · 19th April 2004, 01:31 AM

Anyone have the schematic?

Algar_emi · 19th April 2004, 02:26 AM

I may be able to help you. Send me a email. Bye...

fcel · 19th April 2004, 02:40 AM

One possibility is that the main system controller chip is bad. Call ML, they might send you one to try out.

Peter Daniel · 19th April 2004, 02:59 AM

Algar is an expert on ML preamp. Contact him first.

I wouldn't count on ML support, the company is known for very slow response and ignoring individual inquiries.

18th April 2004, 08:33 AM	#1
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Help needed with Preamplifier ML 38S I've got problem with Mark Levinson Preamplifier 38S. The volume control is dead at volume 19. Nothing happens if I turn the volume knob up or down. Also cannot adjust balance (which is also with this volume knob). The sound is badly distorted, at low volume (cannot raise to bigger volume) I've checked the voltages, the +5, +/-15V are all there. All fuses are OK. It seems like many digital cct inside. Someone have full schematic to this preamp? Or help repairing it?

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19th April 2004, 01:31 AM	#2
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Anyone have the schematic?

19th April 2004, 02:26 AM	#3
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	I may be able to help you. Send me a email. Bye...

19th April 2004, 02:40 AM	#4
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	One possibility is that the main system controller chip is bad. Call ML, they might send you one to try out.

19th April 2004, 02:59 AM	#5
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Algar is an expert on ML preamp. Contact him first. I wouldn't count on ML support, the company is known for very slow response and ignoring individual inquiries.

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