Marantz CD6000OSE - analog outputs distorts

gumleguf · 26th January 2011, 08:06 PM

Hi,

The analog outputs (both rear and headphone jack on front) distort heavily when plugged in. When using digital outputs no issues.

Anyone heard of that or have an idea what is wrong?

/G

Mooly · 27th January 2011, 07:39 AM

Muting transistors faulty ? This is a common issue on some Marantz players

Marantz SA8001 Modification to Eliminate Distortion

which fixed this player.

Extreme_Boky · 27th January 2011, 08:35 AM

The muting transistors would affect analog RCA output section but not the headphone section. The muting circuit (transistors) are used at both outputs, but are different sets - not the same...If both RCA and headphone out exhibits the same symptoms I would look at:

1. +12 and -12 regulation for analog stage.
2. If above is okay -> analog out from the DAC (with CRO and test disk)... and then go either towards SAA7372 chip (if signal looks distorted), or towards analog filter / buffer if the signal looks good.

There's interface chip between SAA and DAC's... that one has clock out signal on pin 30; make sure it is a clean signal at correct frequency if the analog-out from DAC’s looks distorted…

I presume you have the User Manual?

It is easy to record 10kHz signal on a CD if you have a tone generator and digital interface card with CD burner… you don’t need expensive CD Test Disks…

Boky
PS Good luck!

stephensank · 27th January 2011, 04:25 PM

I wouldn't rule out muting transistors. It is not very rare to have all four(phone & main out) of the terrible 2SC2878 xstors usually used to go bad all at the same time. Seems some batches of these are much shorter life than others. I always replace either with 2SK117/170 jfets or with flipped(emitter to ground) 2SC2240 and never have the fault happen ever again.

Extreme_Boky · 27th January 2011, 06:25 PM

There are actually 8 muting transistors in that CD player. Now, if they've been pre-programmed to autodestruct all at the same time...

Boky

26th January 2011, 08:06 PM	#1
gumleguf diyAudio Member Join Date: Jan 2011	Marantz CD6000OSE - analog outputs distorts Hi, The analog outputs (both rear and headphone jack on front) distort heavily when plugged in. When using digital outputs no issues. Anyone heard of that or have an idea what is wrong? /G

27th January 2011, 07:39 AM	#2
Mooly diyAudio Member Join Date: Sep 2007	Muting transistors faulty ? This is a common issue on some Marantz players Marantz SA8001 Modification to Eliminate Distortion which fixed this player. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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27th January 2011, 08:35 AM	#3
Extreme_Boky diyAudio Member Join Date: Dec 2003 Location: Sydney	The muting transistors would affect analog RCA output section but not the headphone section. The muting circuit (transistors) are used at both outputs, but are different sets - not the same...If both RCA and headphone out exhibits the same symptoms I would look at: 1. +12 and -12 regulation for analog stage. 2. If above is okay -> analog out from the DAC (with CRO and test disk)... and then go either towards SAA7372 chip (if signal looks distorted), or towards analog filter / buffer if the signal looks good. There's interface chip between SAA and DAC's... that one has clock out signal on pin 30; make sure it is a clean signal at correct frequency if the analog-out from DAC’s looks distorted… I presume you have the User Manual? It is easy to record 10kHz signal on a CD if you have a tone generator and digital interface card with CD burner… you don’t need expensive CD Test Disks… Boky PS Good luck!

27th January 2011, 04:25 PM	#4
stephensank diyAudio Member Join Date: Oct 2006	I wouldn't rule out muting transistors. It is not very rare to have all four(phone & main out) of the terrible 2SC2878 xstors usually used to go bad all at the same time. Seems some batches of these are much shorter life than others. I always replace either with 2SK117/170 jfets or with flipped(emitter to ground) 2SC2240 and never have the fault happen ever again.

27th January 2011, 06:25 PM	#5
Extreme_Boky diyAudio Member Join Date: Dec 2003 Location: Sydney	There are actually 8 muting transistors in that CD player. Now, if they've been pre-programmed to autodestruct all at the same time... Boky

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