Audio Asylum Thread Printer

Get a view of an entire thread on one page

Digital Drive

It's probably the focus gain and tracking servos, you'll need an oscilloscope

71.55.44.31

cfb

In Reply to: RE: Skilled at solderwicking SMDs? Then, yes but you'll spend more time than it's worth. How-to get started. posted by Crazy Dave on May 10, 2012 at 11:17:58

to observe the CD 'eye pattern' off of the RF test point. The CD RF Signal is at pin 45 test point of IC502, the chip is marked Toshiba TA1313F. The RF signal is also at pin 142 of IC401 marked TC9489F. Test points are on the main pc board “EU01”.

Typically, if a player is too sensitive to pit defects the focus gain and / or tracking gain will need to be decreased slightly. This is assuming that the sled mechanism is functioning correctly, it could be a bad spindle motor starting to fail or the laser diode pickup head may need to be replaced. Historically on many CD players one could adjust the servo gain manually but the Toshiba has automatic servo adjustment and if it is off they say replace the pickup head assembly. If one wishes to go beyond the service manual the servo control chip is IC503, marked KA3032. The Focus Coil is off IC503 at pins 37 ( + ) and 38 ( – ) they go to connector CN501 at pin 15, FC ( + ) and pin 18, FC ( – ) GND. The Tracking Coil is off IC503 at pin 36, TC ( + ) and pin 35, TC ( – ) and over to connector CN501 at pins 17 ( + ) and 16 ( – ).

Follow Ups:

RE: It's probably the focus gain and tracking servos, you'll need an oscilloscope - Crazy Dave 09:27:58 05/11/12 (6)
Thank you for the detailed response! I have a scope but it is not a high frequency scope. I should have stated before that the sled mechanism does not appear to be functioning correctly. It is functioning, but seems to be a little clunky. It is also noisy, which I have read is not uncommon with this player. Toshiba came up with a "fix", but I don't know how to verify if it has been done to this player, but I strongly suspect it has not.

Can the spindle motor be replaced by itself, or do you need a whole new sled?

Dave
- Unfortunately Toshiba discontinued supplying many older parts in 2011. - cfb 11:28:11 05/11/12 (4)
  None of the usual suppliers such as pacparts has any stock left of the older Toshiba parts. At this point if you can find a working transport assembly salvage it for spare parts.
  The parts are as follows;
  Loading motor assembly was $35 part# 79070484
  Feed motor was $27 part# 79070421
  Laser pickup part# 79070470 overpriced, I think the last price was $150
  The spindle motor RM01, CL923U was not available separately, part of the laser assembly I believe and there is a problem, many of the single bearing DVD player spindle motors have a high failure. They are usually just a 5 to 15 dollar part. Unless you can find a part house that still has some NOS motors, you'll be hard pressed to find a used Toshiba 9200 that has a working spindle motor after 10 years of use. The only solution is a kludge to adapt a motor from a DVD Rom drive to the control board it will need to be a 5 lead motor. A shame that an expensive player is basically unrepairable after 10 years due to a simple motor.
  - RE: Unfortunately Toshiba discontinued supplying many older parts in 2011. - Crazy Dave 13:35:28 05/11/12 (3)
    Thanks much for the parts. I am not above scrounging around.
    
    - A shame that an expensive player is basically un-repairable after 10 years due to a simple motor.
    
    My Mission DAD-7000 works fine and sounds good as new (which actually is not that good!), after I replaced the drawer belt with an O-ring form the hardware store. I even have a working Magnavox CD-1, which sounds even wore than the DAD-7000.
    
    Yet Art Dudley's Sony and my Toshiba are feet-up on the table before their 10th birthday!
    
    Dave
    - PS. Looks like a usable Toshiba spindle motor popped up on ebay in NZ, - cfb 07:49:26 05/12/12 (0)
      If you really need one.
      
      New Zealand ebay item 170784413891 NEW TOSHIBA MECHA ASSY PU 79070470
      http://www.ebay.com/itm/BRAND-NEW-TOSHIBA-MECHA-ASSY-PU-7907 (Open in New Window)
    - If you are interested in the technical side of CD players; here are two books to get you started. - cfb 07:47:02 05/12/12 (1)
      Both written in the 90s but still covers the basics. Overpriced new but you can get a used book at Alibris.com or Powells used books.
      
      Troubleshooting and Repairing Compact Disc Players by Homer L. Davidson
      Understanding and Servicing CD Players by Ken Clements
      - RE: If you are interested in the technical side of CD players; here are two books to get you started. - Crazy Dave 13:51:59 05/14/12 (0)
        
        In Reply to: RE: If you are interested in the technical side of CD players; here are two books to get you started. posted by cfb on May 12, 2012 at 07:47:02
        
        Thanks for both posts! I have used Powells before. I track those books down.
- Note - Crazy Dave 09:44:57 05/11/12 (0)
  I bought this thing for very cheap at a thrift store. As you say, it is a boat anchor today. If I wreck the thing tying to fix it, I will chalk it up to a learning experience and a donation to Good Will. I am interested in learning how to fix CD players.
  The build quality on this thing is very impressive!
  Dave
  
  Edits: 05/11/12

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.