marantz cd6006 power supply issue

Hi all , i'm a bit stuck with a power supply , i have this marantz cd 6006 player i am trying to fix , there seemed to be an issue with the drive motor but i think it was down to the power supply failing , the main transformer is separate , i get 240v at the main transformer plug but it drops to 0 when i plug it in , i thought the transformer could have been shorted but it seems ok .
When i connect the transformer directly to the mains and it works ok without getting hot .
Here are some photos of the psu , i have checked all the caps on the power board , they seem fine . and the 2 transistors on the black heatsinks , they are ok , The third black heatsink is a voltage regulator (7805A) there is no voltage getting to this though ..
If anyone is familiar with this board and could point me in the right direction i would be very grateful .

Dropbox - marantz psu.jpg - Simplify your life


Dropbox - Photo 25-01-2020, 10 10 57 am.jpg - Simplify your life



heres the back of the board

Dropbox - Photo 28-01-2020, 6 49 13 pm.jpg - Simplify your life
 
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Photo 25-01-2020, 10 10 57 am.jpg

Photo 28-01-2020, 6 49 13 pm.jpg

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Mooly

Administrator
Paid Member
2007-09-15 8:14 am
As to your fault...

The primary voltage on the transformer dropping from 240V to 0V when you power up and plug the transformer in suggest a very high resistance connection somewhere.

Bizarre causes can be actual fuses themselves where the fuse wire is just touching the end cap internally. I've come across that only once or twice in literally thousands of repairs over many years. Also fuse holders. Check the mains plug as well.

Mains switches are another much more likely cause. Even a fracture in the mains lead could do this.

It has to be something like this causing the incoming supply voltage to fall to zero.
 
As to your fault...

The primary voltage on the transformer dropping from 240V to 0V when you power up and plug the transformer in suggest a very high resistance connection somewhere.

Bizarre causes can be actual fuses themselves where the fuse wire is just touching the end cap internally. I've come across that only once or twice in literally thousands of repairs over many years. Also fuse holders. Check the mains plug as well.

Mains switches are another much more likely cause. Even a fracture in the mains lead could do this.

It has to be something like this causing the incoming supply voltage to fall to zero.

ok , tried another fuse , a different mains lead and a different wall outlet . same fault ,
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
Its a bit hard to figure out from pictures... however there appears to be a relay and a small auxiliary standby power supply.

If it is configured like that then is the relay closing correctly?

Is the standby supply OK? It is quite common for the internal thermal fuse to fail on these small kinds of transformers.

The 240V across that ceramic cap suggests the relay is not closed. I think it is wired across the contact. This is also why you see 240V when the transformer is not connected. The cap allows enough AC current to pass so that the meter reads the open circuit voltage correctly.
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
I have a Marantz Pearl Lite SACD and the PSU is fairly similar. Small standby transformer at the top, the relay in the middle and the large main transformer below.

If the transformer is open then it should be possible to fit a small generic replacement for well under a fiver.

Edit... I remembered this from last year which could be similar.

Marantz SA-KI Pearl Lite REPAIR
 

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I have a Marantz Pearl Lite SACD and the PSU is fairly similar. Small standby transformer at the top, the relay in the middle and the large main transformer below.

If the transformer is open then it should be possible to fit a small generic replacement for well under a fiver.

Edit... I remembered this from last year which could be similar.

Marantz SA-KI Pearl Lite REPAIR

The relay seems ok i put 24 vdc across the coil and it seems to be closing ok
 

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