CDM-4/19 running at warpspeed - 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 2nd May 2008, 05:35 PM   #1
diyAudio Member
 
Join Date: Apr 2008
Default CDM-4/19 running at warpspeed

Hi,

the CDM-4/19 of my Philips CD780/00R player runs at warm speed when I turn on the power switch of the player. Since I donīt have any service manual neither of the player itself nor of the CDM-4/19, can anybody here please advise where and how to start debugging?

Thanks a mil in advance!
P.
  Reply With Quote
Old 2nd May 2008, 06:06 PM   #2
diyAudio Member
 
Audiofanatic's Avatar
 
Join Date: Oct 2002
Location: The Netherlands, Utrecht
Default Philips

Hi P,


If there is a SAA7220 or a SAA7345 in the player, than probably this is the culprit of the spinning CD.


Best regards,


Audiofanatic
__________________
Be nice to animals.
  Reply With Quote
Old 2nd May 2008, 08:15 PM   #3
diyAudio Member
 
Join Date: Apr 2008
Hi there,

there is a SAA7220P/A and a SAA7210P in the player... . How to best diagnose whether the SAA7220P/A is the culprit one for the warp speed? I mean, I have just the datasheet of the SAA7220 in front of me and am looking for best practice diagnosis.

Thanks a mil again,
P.
  Reply With Quote
Old 2nd May 2008, 11:49 PM   #4
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
From my digital guru:

"Tell this guy to check the '7220 for proper operation. It has the clock,
and if that chip does not work, the platter spins at warp speed."
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 3rd May 2008, 09:15 AM   #5
diyAudio Member
 
Join Date: Mar 2008
Look first at the TCA0372. If this are blown/shorted the CD will spin non stop.
  Reply With Quote
Old 3rd May 2008, 12:30 PM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Check ALL supplies first to all I/C,s. Might be a safety resistor gone high.
  Reply With Quote
Old 4th May 2008, 08:23 PM   #7
diyAudio Member
 
Join Date: Apr 2008
@Mooly: All supplies to all ICs look good. I am just done with measuring. Even all resistors look OK to me.

@Predator864: There is a TCA0372DP2 (Motorola) on the board. I even have the datasheet and started measuring. Hmm.. question: Would the CD spin counter-clockwise at overspeed when this TCA0372DP2 is blown/shorted?

@SY: The SAA7220 is absolutely OK from what I measured. And the SAA7110 shows a fixed 88.19 kHz signal on Pin 17 (MSC). This is good news, right?

@All: If anybody could share the Service Manual for the Philips CD780/00R with me, I could continue much more systematically. Your help is highly appreciated!

Any more hints on how to continue a bit more systematically? I would like to track down the 88.19 kHz signal from Pin 17 (MSC) of the SAA7220 a bit further, but I donīt have any schematic of the PCB of the CD player, so I am a bit lost at this moment. Any advice you could give, please?
  Reply With Quote
Old 4th May 2008, 09:14 PM   #8
diyAudio Member
 
Join Date: Mar 2008
I blown a TCA0372 while measuring it. Then the CD began spinning like a madman.
  Reply With Quote
Old 4th May 2008, 09:24 PM   #9
diyAudio Member
 
Join Date: Apr 2008
@Predator864: Did the CD start spinning counter-clockwise after the TCA0372 was blown?
  Reply With Quote
Old 4th May 2008, 09:26 PM   #10
diyAudio Member
 
Join Date: Mar 2008
I dont know. Scared the crap out of me and unplugged it immediately.
I can clearly remember by shorting two pins of the IC the CD would spin in a direction, but again I dont know if it is CW or CCW.
  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
What advantages running ported midbass if you are running a sub? mitchyz250f Multi-Way 3 20th May 2008 02:34 PM
My first ever DIY Amp up and Running ! Ebola Class D 3 12th December 2006 09:49 AM
Running-in the UCD 180... ptwining Class D 10 12th August 2006 05:19 AM
New Ono up and running Ed Robinson Pass Labs 13 14th June 2003 06:45 PM
p3a up and running :) Jean Solid State 10 1st December 2002 02:07 AM


New To Site? Need Help?

All times are GMT. The time now is 04:27 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2