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Old 26th January 2011, 08:06 PM   #1
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Default 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
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Old 27th January 2011, 07:39 AM   #2
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Muting transistors faulty ? This is a common issue on some Marantz players

Marantz SA8001 Modification to Eliminate Distortion

which fixed this player.
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Old 27th January 2011, 08:35 AM   #3
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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!
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Old 27th January 2011, 04:25 PM   #4
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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.
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Old 27th January 2011, 06:25 PM   #5
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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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