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Old 19th May 2004, 04:46 PM   #1
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Exclamation Source for SAA7220 and SAA7210

I have an RCD 855 with a upgraded clock, that has a problem with discs spinning at high speed immediately on turn on. The player has been working fine for over two months, and now this problem has occured. I've verifed voltage inputs from power suppy, and even tried running the clock from the CD players own supply, but the player still spins at very high speed. The clock has been returned to the manufacturer and it works as advertised for him. I made a request for schematics on a previous thread but nothing has turned up at this time. My guess is that either the SAA7210 or the SAA7220 has failed, but my o-scope is in storage at this time and no schematics available, so I have limited testing ability. My only options appear to be changing these items out one at a time. Can anyone recommend a source for these items?

Thanks,
PH
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Old 19th May 2004, 08:59 PM   #2
TDA1540 is offline TDA1540  Netherlands
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continuous turning disc and also no display?

(that would narrow the search.BTW i don't think the SAA's are the problem)
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Old 19th May 2004, 09:23 PM   #3
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TDA1543210, restore the original situation and see if the player works again.
Edit, Sorry I keep addressing the wrong guy. I meant the thread starter, P Howard.
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Old 19th May 2004, 09:24 PM   #4
TDA1540 is offline TDA1540  Netherlands
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I have no problem....
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Old 19th May 2004, 09:54 PM   #5
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Yeah.......no clock......it spins really, really fast. I know. I've mucked up my share.

(OK......only once.........the PSU had a resistor go open.)

Jocko
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Old 19th May 2004, 11:10 PM   #6
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Default saa7210 rotel rcd 855

The disc spins, but the display is active. It doesn't provide useful data, but all characters are there and complete.
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Old 19th May 2004, 11:13 PM   #7
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Quote:
Originally posted by Elso Kwak
TDA1543210, restore the original situation and see if the player works again.
Edit, Sorry I keep addressing the wrong guy. I meant the thread starter, P Howard.

The very first thing I did was to resore to original and try the player. No luck there.
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Old 23rd May 2004, 10:55 AM   #8
Fabian is offline Fabian  Switzerland
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Hi PH,

I've got a very similar problem with my Philips CD 650 I think (see: http://www.diyaudio.com/forums/showt...267#post398267). Display works fine but some controll buttons on the frontpanel don't work anymore.

Donberg (http://www.donberg.ie/descript/s/saa7210.htm) offers SAA7210 and SAA7220.

I'm still not sure what causes the high speed spinning(unfortunately I haven't got a scope). This and the high shipping price prevents me from buying those chips. (maybe we could order togehter?)

Regards, Fabian
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Old 23rd May 2004, 10:58 AM   #9
Bricolo is offline Bricolo  France
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I doubt the 7220 is in cause, since it's a digital filter and has no control on the cd rotation
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Old 23rd May 2004, 12:51 PM   #10
Fabian is offline Fabian  Switzerland
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I just removed the SAA7220 and connected the TentXO directly to the SAA7210. No more high speed spinning! But I still have more distortion at low levels on one channel.

I think I have destroyed something on the oscillator in the SAA7220 when connecting the TentXO (although I don't know how).

PH, if you have the SAA7210/SAA7220 chipset, the clock is very likely generated at SAA7220 and fed from the buffered output (Pin9) to SAA7210 (Pin19). You could connect your clock to Pin19 and see if the problem is solved (make sure that the buffered clock output of SAA7220 is disconnected).

Fabian
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