Marantz CD6000 KI - problem between headphone out and phono - any ideas?

AlC · 21st May 2003, 12:24 AM

Hi

I have just bought a Marantz CD 6000 KI edition CD player which sounds great through the headphone socket but has no output from the left phono socket. I took off the lid in the hope that it was a loose lead but there is nothing obvious wrong to the eye. Does anyone have a pointer as to where to look next or is this likely to be in need of a repair shop!?

Cheers

Al

carlosfm · 21st May 2003, 03:47 PM

Life would be so easy if everything was a loose lead...

Al, I suppose it's a used cd-player, isn't it?
Maby the guy that had it used those "high-end" cables with "high-end" plugs that you have to make brutal force to plug in.
Those plugs make good contact, no doubt, but sooner or later you'll have a broken female or a cracked solder joint on the circuit.
First thing you can try is to re-solder the female RCA plugs under the circuit.
Maby that's the problem.

ergo · 21st May 2003, 07:51 PM

Find the opamp NJM4556, this is the opamp used for headphone amplification.

If the signal is there in the line-out then the problemhas to be around this opamp......

Ergo

AlC · 21st May 2003, 11:28 PM

Hi

Encouraged by carlosfm I took the circuit board out and resoldered the phono connectors on the board - I also made sure there was continuity between the board connections and the phono sockets - unfortunately this hasn't fixed the problem (thank you carlosfm anyway)

Apologies ergo but could you give me a bit more detail on where exactly to look for a signal as I am not very wise on matters electronics - can I look for a signal with a multimeter/voltmeter or do I need more sophisticated equipment.

Cheers

Al

ergo · 23rd May 2003, 11:49 AM

there has to be an output signal on pin 1 and pin 7 of IC 7235 (type NJM4556) for L and R channelo correspondingly.

You can check it with DMM if you have one with analog bar. Digital number is not fast enough. Or if you can play back some sinus test signal (any freq between 20 and 1000Hz) then you can also check the presence of the signal. It should be about 2V AC.

If the signal is missing on either of these pins then check pins 3 and 5. These are the opamp inputs. If signal is present here then you have a dead opamp in your hands.....

Ergo

21st May 2003, 12:24 AM	#1
AlC diyAudio Member Join Date: May 2003 Location: England	Marantz CD6000 KI - problem between headphone out and phono - any ideas? Hi I have just bought a Marantz CD 6000 KI edition CD player which sounds great through the headphone socket but has no output from the left phono socket. I took off the lid in the hope that it was a loose lead but there is nothing obvious wrong to the eye. Does anyone have a pointer as to where to look next or is this likely to be in need of a repair shop!? Cheers Al

21st May 2003, 03:47 PM	#2
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	The loose lead Life would be so easy if everything was a loose lead... Al, I suppose it's a used cd-player, isn't it? Maby the guy that had it used those "high-end" cables with "high-end" plugs that you have to make brutal force to plug in. Those plugs make good contact, no doubt, but sooner or later you'll have a broken female or a cracked solder joint on the circuit. First thing you can try is to re-solder the female RCA plugs under the circuit. Maby that's the problem.

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21st May 2003, 07:51 PM	#3
ergo diyAudio Member Join Date: Mar 2001 Location: Tallinn, Estonia	Find the opamp NJM4556, this is the opamp used for headphone amplification. If the signal is there in the line-out then the problemhas to be around this opamp...... Ergo

21st May 2003, 11:28 PM	#4
AlC diyAudio Member Join Date: May 2003 Location: England	Hi Encouraged by carlosfm I took the circuit board out and resoldered the phono connectors on the board - I also made sure there was continuity between the board connections and the phono sockets - unfortunately this hasn't fixed the problem (thank you carlosfm anyway) Apologies ergo but could you give me a bit more detail on where exactly to look for a signal as I am not very wise on matters electronics - can I look for a signal with a multimeter/voltmeter or do I need more sophisticated equipment. Cheers Al

23rd May 2003, 11:49 AM	#5
ergo diyAudio Member Join Date: Mar 2001 Location: Tallinn, Estonia	there has to be an output signal on pin 1 and pin 7 of IC 7235 (type NJM4556) for L and R channelo correspondingly. You can check it with DMM if you have one with analog bar. Digital number is not fast enough. Or if you can play back some sinus test signal (any freq between 20 and 1000Hz) then you can also check the presence of the signal. It should be about 2V AC. If the signal is missing on either of these pins then check pins 3 and 5. These are the opamp inputs. If signal is present here then you have a dead opamp in your hands..... Ergo