Jump to content

Sign in to follow this  

Does a laser pick up have a home position?

Recommended Posts

Hi Everyone,


I have recently been getting some cracking noises through my CD player like the signal was breaking down or something??


I tried cleaning the laser and runners and now it won't open or read the TOC/play.  It is a TASCAM player/recorder and has a CD ROM inside which has the button like on a computer, this is how I can open it to see that it will not play (the buttom in the CD player interface in what is not working). 


I didn't think I did anything that would have cause a problem however I must have, i did move the laser on the slider a lot by hand.


My question is do some CD ROMS have a home position that they use as a start point?  This is the only other potential issue I can think of unless the noise was being cause another component failing.


Any sensible recommendation will be appreciated and other comments will be marked out of 10 ;)







Share this post

Link to post
Share on other sites

TOC Errors usually boil down to burnt or weak lasers. There are trimpots on the pcb near the laser or on the servo board that can be adjusted for laser tracking and power of the beam. Too strong and it won't work and quickly burn out the laser, too weak or too little power and it will fail to read discs properly. There is no home position except it retracts to it's starting position on the glider the mechanism motor connected to. 


TOC errors can also be fixed by either a low-level firmware update to the servo board or a re-capping a  failed cap on the servo board. IC's that store buffered memory can also get corrupt over time on the servo board and need to be wiped or replaced.


If the player is using a CD ROM drive using a conventional pc PATA(IDE) interface as connection, rip it out and install another CD ROM driver in (or DVD ROM/drive).

Edited by DefQon

Share this post

Link to post
Share on other sites

Thanks for that DefQon, all good information.  I think I might take it in and get it repaired professionally and hopefully it won't cost too much.

Of course I had to start googling and in case I needed a replacement and saw that Musical Fidelity are making a half width CD transport (M1CD) which looks pretty cool.  How do I resist, should I be resisting.

Share this post

Link to post
Share on other sites

Yeh repairing cd/dvd transports is a finicky process which requires the right tools. I`ve got over 5k retail worth of stuff that cannot be repaired. It hurts looking at something that use to work only now it doesnt.

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Classifieds Statistics

    Currently Active Ads

    Total Sales (Since 2018)

    Total Sales Value (Last 14 Days)

    Total Ads Value (Since March 2020)
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By mtan002
      Item: Tascam DR-22WL Portable Field Recorder with WiFi
      Location: Melbourne
      Price: $180 (including domestic postage)
      Item Condition: Used but excellent
      Reason for selling: Hardly used
      Payment Method: Pickup - Cash, Paypal
      Extra Info:
       Bought less than a year ago and used it twice.
      I still have the original packaging box and the USB cable for power and file transfer. 
      You can find out more about this item from below:

      Photos: Advertisements without photos of the actual item will not be approved.

    • By Hirographfx
      Hi Stereonetters,
      Today I purchased for NZD$1 (deemed as E-Waste) two Tascam 112R MK II Cassette Decks - I am looking for someone in NZ that can assess and repair at least one of them. One of decks powers up but when I play a tape it goes into Record Pause Mode. Neither Play, FF or RW is functioning. I contacted Fred at Retrotronics in Auckland but he does not repair he prefers to buy, restore and sell his own equipment which is understandable. I am based in Hamilton New Zealand and the repairer could use parts from one to the other or repair both... after paying out $1 I'm happy to throw some coin into this job could even give one of the decks to the repairer if they want to have one for themselves...as long as I get my one up and going. Parts available from https://tascamninja.com 
      Let me know if you a guy or gal up for the job, cheers William.

    • By BMC Audio Visual
      Item: BenQ LK970 4K Laser Projector
      Location: Burwood VIC
      Price: $12,999 Reduced to $9,750 for quick sale
      Item Condition: NEW Shop display model in "as new" condition with only 21 hours of use (see photo) with box, manuals, remote and full warranty.
      Reason for selling: Demo Clearance Sale
      Payment Method: Pickup - Cash, COD
      Extra Info:
      This BenQ model is extremely good value for money No other projector can deliver 5,000 lumens at this price point for home cinema. Suits bright rooms perhaps with windows or stray ambient light. Genuine 4K with 8.3 million distinct pixels Long Lasting, maintenance-free from 4K BlueCore Laser technology Up to 20,000 hours of perfect performance, no bulbs to replace LK970’s flexible installation features such as H/V lens shift, big zoom, 360° projection and portrait capability make it a versatile projector perfect for diverse rooms. With two advanced cooling systems to ensure optimal thermal conduction during operation. Circulatory liquid cooling system & heat pipe cooling system.  

    • By Joelim
      Item: Teac Vinyl + CD combo
      Location: Melbourne eastern/northern
      Price: 65
      Item Condition: Used once for CD, Vinyl unused. 
      Reason for selling: Don't need
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info: Would make a great gift for someone starting out, or just as a musical furniture piece. 
      Happy to trade with a few jazz/audiophile CDs, a decent power board or banana plugs. 

    • Guest Proshchay
      By Guest Proshchay
      Hi folks, I thought i'd share this interesting write up on some of the best cassette decks ever made, by a self-confessed cassette and R2R nutter!

  • Create New...