Philips CD720 (CDM12.1) beginning to skip - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th March 2003, 08:57 AM   #1
diyAudio Member
 
Join Date: Feb 2002
Location: Germany
Question Philips CD720 (CDM12.1) beginning to skip

Our secondary player which used to play all CD-Rs, even those that the car player refuses due to low reflectivity, is now beginning to skip occasionally even on high-reflectance CD-Rs. I don't think I have observed this on original CDs yet, but I may be wrong there.

The eye pattern after preamplification looks fine (it's the variety with a discrete preamp, half of which sits on the flexible pcb next to the pickup).

What should I do next?
- crank up the laser (which direction?)
- put automobile engine oil on the steel rod that the sledge glides on?

As a last resort, I still have a Grundig drive & electronics that I purchased as industry surplus. I noticed there are different CDM12.1 drives, some of which have no transistors on the pickup unit and a TDA1302 preamp either on the pickup or on the main pcb instead. The Grundig still has the discrete amp. Can I count on it to be compatible?

Eric
  Reply With Quote
Old 12th March 2003, 12:16 PM   #2
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Default Re: Philips CD720 (CDM12.1) beginning to skip

Quote:
Originally posted by capslock


What should I do next?
- crank up the laser (which direction?)
- put automobile engine oil on the steel rod that the sledge glides on?

Eric
Did you clean the lens? (Distilled water & cotton stick)
Don't cranck up the laser. Won't help you in the long run.
Don't apply "Engine Oil". Clean the rod(s) with alcohol or similar and apply some very thin oil. Just a tiny drop.

/Hugo
  Reply With Quote
Old 12th March 2003, 02:15 PM   #3
diyAudio Member
 
Join Date: Feb 2002
Location: Germany
Lens looks fine (no smoker ever came near), so I decided not to fool with that. Besides, eye pattern looks fine to me.

Mrfeedback even recomments automatic transmission oil...

Regards,

Eric
  Reply With Quote
Old 12th March 2003, 02:26 PM   #4
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Quote:
Originally posted by capslock
Lens looks fine (no smoker ever came near), so I decided not to fool with that. Besides, eye pattern looks fine to me.

Mrfeedback even recomments automatic transmission oil...

Regards,

Eric
You should clean it; don't be afraid, if you are gentle with it nothing will happen.
Check this too: Looking for the Sony CD player CDP-102 service manual

I think Mrfeedback must have been joking?

/Hugo
  Reply With Quote
Old 12th March 2003, 03:21 PM   #5
diyAudio Member
 
Join Date: Dec 2001
Location: Eindhoven
Hi

Since the eye pattern is fine, cleaning the lens would not realy be required

You may verify the radial tracking mechanism, its' grease can become slightly "rigid" after a while

I do not have a clue which grease is allowed, but be careful because some grease interacts at a nasty way wich plastics......

Also, this great link may help

http://www.repairfaq.org/REPAIR/F_cdfaq.html

succes
__________________
Guido Tent
www.Tentlabs.com
  Reply With Quote
Old 18th March 2003, 03:53 PM   #6
diyAudio Member
 
Join Date: Feb 2002
Location: Germany
Default calling Mrfeedback

Eric,

seeing you are back, I would like to ask whether you had a comment....

Thanks,

Eric
  Reply With Quote
Old 18th March 2003, 04:08 PM   #7
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
If you want info from Mr Feedback it is better to send a private mail. You don't seem to accept the answers you got so opening a thread is a bit useless.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 19th March 2003, 08:10 AM   #8
Hamish is offline Hamish  Australia
diyAudio Member
 
Hamish's Avatar
 
Join Date: Nov 2002
Location: Brisbane, Australia
mr feedback doesn't recommend engine oil, but automatic transmission fluid. this is fine as it has additives for bronze based bushes. just don't use too much, only rub it on. in fact, use very little. incidently, you can also use motorcycle fork oil as this is the same, but comes in much thinner grades. personally i use watchmakers oil. super thin and lasts nearly forever.
  Reply With Quote
Old 24th March 2003, 12:51 PM   #9
diyAudio Member
 
Join Date: Feb 2002
Location: Germany
Quote:
Originally posted by jean-paul
If you want info from Mr Feedback it is better to send a private mail. You don't seem to accept the answers you got so opening a thread is a bit useless.

Well, the answers here were really basic (this isn't exactly the first player I repair) and not really in response to my questions. MrFeedback has given good advice on repairing my CDM-9, and with the exchange having gone on in a forum here, it is all there for everybody's reference.
  Reply With Quote
Old 24th March 2003, 12:55 PM   #10
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Quote:
Well, the answers here were really basic (this isn't exactly the first player I repair) and not really in response to my questions. MrFeedback has given good advice on repairing my CDM-9, and with the exchange having gone one in a forum here, it is all there for everybody's reference.
OK, the suggestion to crank up the laser ( and asking which direction ) together with the engine oil gave the impression you were repairing a player for the first time.

The basic answers of cleaning the lens and lubricating with the right grease are the solution in at least 50 % of failures. You could have excluded basic answers by telling you already looked into that. Besides that you asked yourself if lubrication was a solution.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
philips cd720 service manual need kaulagalvis Digital Source 1 17th February 2007 04:44 PM
Philips CDM12.4/05 Phasenoise Digital Source 11 14th December 2006 08:50 PM
Philips CDM12.10 dsmkwan Digital Source 12 10th May 2006 09:42 PM
Philips CDM12.4 + L1210 mechanism JonHarrison Parts 7 13th April 2006 02:58 PM
Cd player beginning to skip.... :( Duo Digital Source 38 30th November 2002 09:05 PM


New To Site? Need Help?

All times are GMT. The time now is 02:42 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2