CDP-555ES Spindle motor not spinning - diyAudio
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Old 11th June 2013, 08:55 PM   #1
SonyES is offline SonyES  United Kingdom
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Default CDP-555ES Spindle motor not spinning

Hi Guys, newbie here!
I wonder if you might be able to help me troubleshoot a poorly CDP-555ESD.
Firstly, the laser appears to be in good shape its the BU1-E transport, I have physically seen a dot in the upper lens which would indicate its at least operational.
The problem I am having though is the spindle motor will not move whatsoever not even with a little help manually, it will not spin at all.
I am getting the following at the following points of the coils which seem to match up with the CDP-337ESD I also have:

Resistance value of 13ohms 26ohms and 39ohms on the 3 copper strands to the right side of the pcb measuring from one of the left side double copper strands.
I have continuity throughout the copper coils.
At the main power input to the board CNP151 I am getting:
10V at +10 -10V at -10 so power "seems" to be getting that far.

A few things that I'm unsure how to check for faults on though one being IC5151 = Toshiba TA7256P (8728K), there seems to be continuity on all pins.

After this I'm unsure where to start so I am open to any and all suggestions.
It is running through the motions of lining up the laser it just doesn't seem to spin the motor.

Many thanks

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Old 13th June 2013, 12:30 AM   #2
SonyES is offline SonyES  United Kingdom
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Now for some bizzare reason the eject is no longer working, any help tracking down what ic controls the loading motor sequence or is there anyone prepared to take a look, really would like to see this in the land of the living again.
Since my last post the eject wont function and the focus on the laser is also no longer running through a sequence, what controls these components?

Many thanks

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Old 15th June 2013, 07:09 PM   #3
SonyES is offline SonyES  United Kingdom
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With some help from stevensank with this have found some components that are not behaving as they should do one being a ICP-F38 microfuse thats not letting voltage go to the rest of the circuits, parts ordered so all being well some more life might come out of this player!
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Old 19th June 2013, 03:21 PM   #4
SonyES is offline SonyES  United Kingdom
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Does anyone know a good place where I can get replacement or alternate parts for 21DQ05 Scottky Rectifiers, VRRM: 50, 1.7A, 25C.
I noticed that googling came up with NTE579 but wanted to be sure that the 90 VRRM 3A rating is ok as a replacement: 90 Volt 3A Schottky Diode - NTE579 - VETCO.NET NTE 90 Volt 3A Schottky Diode - NTE579 - VETCO.NET
One has definitely gone as the others test ok where this one tests bad.
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Old 19th June 2013, 10:15 PM   #6
SonyES is offline SonyES  United Kingdom
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As long as they are ok to be replaced with these the component suggested, i didnt know or not if the original values were important or not, board they have gone on is the power board, I found a chassis screw inside the machine when I first took it apart so I believe this was part of the cause.
Here is a screengrab of the area:
Attached Images
File Type: jpg 21dq05.jpg (98.1 KB, 83 views)
File Type: jpg 21dq05-2.jpg (65.5 KB, 81 views)

Last edited by SonyES; 19th June 2013 at 10:20 PM.
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Old 20th June 2013, 03:21 AM   #7
tvi is offline tvi  Australia
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Location: Moonee Ponds, Vic, Australia
21DQ06 2A 60V
Unit Price 0.122 min order 25
The small part of ignorance that we arrange and classify we give the name of knowledge.
Ambrose Bierce
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Old 20th June 2013, 06:37 AM   #8
Mooly is offline Mooly  United Kingdom
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Just a bridge rectifier made from separate diodes. Those from CPC (free delivery, follow the instructions to the letter) will be perfect and are even higher rated than the originals.
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Old 20th June 2013, 08:09 AM   #9
SonyES is offline SonyES  United Kingdom
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Fab, i'll get some ordered and replace all 4, no sense in leaving the other 3 different values!
Think i'll leave all the mainboard stuff unplugged and test that board independently in-case it blows again, its all good fun this circuitry malarky!
Those dq06's even at 25 minimum order work out 1 more than the minimum 5 at cpc, so at least i would have spares!

Last edited by SonyES; 20th June 2013 at 08:13 AM.
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Old 21st June 2013, 04:57 PM   #10
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You would get better sonic performance and higher reliability if you instead use soft recovery FRED's, e.g., IRC hexfreds, IXYS DSEI-series or Fairchild stealth series. Don't know why anyone likes schottkies. Only slightly better than standard silicon diodes.
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