Marantz CD84 laser failed or not?

[MaccAu]

Marantz CD84 - diodes for PSU

Hi All,

I got myself a beautiful Marantz CD84 via gumtree. The seller was very good about pointing out its issues. Its with the draw mechanism, sometimes it doesnt close completely- I have the service manual so will just re-grease the mechamism - any ideas of what to use?

A few dry joints, i found so decided to recap PSU and Audio with a mix of SilmicII, FG, KZ and one KW. I have not exceeded capactiance, just voltage slightly, so the 3A Schottkies 1N5822, might be over kill and they are large.? any ideas what to use. I think with my Marantz CD75MKII i used 11DQ10 diodes? maybe these would more more suitable?

Opamps, using LM4562

 

[Willi Studer]

I think diodes larger than 2A will also have thicker leads and you will have to drill bigger holes. Four diodes rated at I will make a 3xI capable bridge, so it is easy to do a calculation there.

 

[MaccAu]

Hi Willi,
Thanks, I dont want to really drill holes in the PCB. I was worried it was too much also the 3A 40W, the 11DQ10 would be good then to use

 

[MaccAu]

Marantz CD84 belt - ebay stores good?

Hi

I have found the problem with the CD84 draw issue the belt is loose, and I am wondering If I could use something in its place and whether the ebay stores are good for belts? anyone used them?

What grease should be used for the tray?

Thanks
Sam

 

[poynton]

Try this :- Marantz Riemen / belt CD34 CD54 CD74 CD84 ... CAS | eBay

CAS is pretty reliable.

Andy

 

[MaccAu]

Thanks Andy, I just got one them from CAS. It is well priced over the others also.

 

[MaccAu]

Marantz CD84 grease lube

Ive tried to searching but I cant find what greae/lube is suitable for the tray. The old grease was a thick grey looking grease. the CDM-1 mech is japanese version of the CDM-1.

Thanks
Regards
Sam

 

[Mooly]

I've always used Electrolube SPG (Special Plastics Grease) for most CD repairs. I see its available from Amazon,

http://www.amazon.co.uk/Electrolube-Special-Plastics-Grease/dp/B008RKXPCU


http://www.electrolube.com/products/contact-lubricants/spg/contact_lubricants_other/

 

[JonSnell Electronic]

For the tray, I use dry silicon spray as it doesn't attract the dust and dry up.
Silicon based furniture polish was recommended by Grundig UK.

 

[MaccAu]

Thanks Mooly. That looks a great product. I'll see if i can find it around on ebay.

Thanks Jon,I use a Silicon based oil on the CD rails which seems to really help the disc track. Maybe a grease based form might suit

The tray appears to be metal or plastic the rollers not sure. I cant get rid of all the old grey grease? would that matter

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[MaccAu]

Hi Mooly,
You can merge the post if you like. I found the SPG35L at ELement14.

This is the current spray i use on the CD rails - Silicone Spray Lubricant.
WD-40 | PRODUCTS

 

[Willi Studer]

Any spray, whether teflon or silicon based, contains more or less oil which might destroy MBR rubber belts and O rings, so any surface in contact with rubber should be cleaned, degreased and left dry. Dry silicone spray is good on plastic cogs, although grease lubricant for printers is better because it reduces wear. For sliding surfaces in metal, silicone spray does not work well because the thin layer wears off quickly. Grease is much better there.

 

[MaccAu]

Marantz CD84 motor spinning constantly

Ive recapped my Marantz CD84, greased and new belt, the tray works well, though the issue seems to be now. The motor spins at full speed, and stop will not stop it, only way is powering off. The top of the tray that holds the disc doesnt spin


I wonder If i got cables around the wrong way,the jumper cables

I put a store CD in and it just ejected each time and motor kept spinning, though I saw the laser move to the centre and then move back once I shut off power (only way to stop motor spinning)


What I did in my upgrades. I dont think higher voltage would matter around the DAC etc.
Ive used SilmicII on the audio pcb with LM4562

An externally hosted image should be here but it was not working when we last tested it.

PSU audio board, Schottky Diodes, Elna SilmicII, FG, KZ and KW

An externally hosted image should be here but it was not working when we last tested it.

 

[MaccAu]

Marantz CD84 wont play

I havent used the CD84 in sometime. It has been on a shelf. I took it out today to play and run.

the disc loads, showing the number of tracks etc etc and time, though play is unresponsive? This is a strange issue?

Any ideas, I could try thanks in advance Sam

 

[MaccAu]

Marantz CD84 tray motor dead?

Hi All



My Marantz CD84 was working perfectly a month or so ago when I lasted used it. I am wondering if the spell of humid weather has caused the problem with the playing most of the cd and returning to the beginning? maybe some oil for the swing arm mech?



Another issue is the tray wont respond. I checked all the jumpers , also took of the belt and tried to power the motor with a AA battery, but there was no respond. I had itinally thought it was the open close button on the tray??



Thank you

Regards

Sam

 

[sq225917]

Check there's power going to the motor. If so it should be a simple replacement, 5v mabuchi dc motor.

 

[JonSnell Electronic]

Disconnect the motor from the logic feed before testing with a power supply of around 3volts. If no action, replace the motor. If you power up the motor when still connected, damage may occur to the driver stage.

 

[MaccAu]

Thanks for the reply Sq, i will look out for the motor 5v dc. The CDE84 wasnt playing again so I think the cables must need checking and the seating of the connectors. Motor didnt work with 1.5v battery so it must need more juice to test

Thanks Jon, yes i disconnectred the wires to test it but not with 3v only 1.5v, I will try again if no action will replace iwth motor that SQ mentioned

 

[kevinkr]

This thread is in the wrong place so I'm going to move it to digital source.

Edit: Moved

 

[MaccAu]

Thank you Kevin,

After taking the CD84 partly apart, checking cables etc, the motor is now working, along with lights.