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Cd spins like crazy
Cd spins like crazy
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Old 17th March 2010, 10:34 PM   #1
Calamaro is offline Calamaro  Europe
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Default Cd spins like crazy

Playing with an old Philips cd player, usual mods (new capacitors, non oversampling...). Suddenly the cd starts to spin like crazy, it doesn't stop. Possibly it can read TOC anymore? What did I wrong?
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Old 18th March 2010, 04:51 PM   #2
olriley is offline olriley  United Kingdom
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You don't list player type or spec (not very helpful).

I assume its a tda1541/saa7220 family machine

No clock signal most likely. Otherwise faulty SAA7220. See here

Regards - Oliver
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Old 19th March 2010, 09:51 AM   #3
Calamaro is offline Calamaro  Europe
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Oliver, thank you for your reply.
Player is a tda1543 based.
I haven't a scope so it's impossible to check clock signal I think.
I'll try to replace SAA7220.
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Old 19th March 2010, 10:08 AM   #4
amc184 is offline amc184  New Zealand
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Cd spins like crazy
Unless you've done something really strange, I doubt any particular part is faulty. Uncontrolled spinning of the CD means that the spindle motor control circuit isn't working, possibly due to a loss of clock to the SAA7210 / SAA7310 decoder IC.

What model of CD player are you using? What exact modifications did you do to the CD player? Can you post some photos of the CD player in it's current state?
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Old 19th March 2010, 10:38 AM   #5
poynton is offline poynton  United Kingdom
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Have you "modded" the clock ???

Possibly upset the clock signal when you did the NOS mod.

Sounds like you did all the mods at the same time !!!


Quote:
RULE #1

One mod. at a time and check it is working before going to the next mod.!

Andy


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Last edited by poynton; 19th March 2010 at 10:41 AM.
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Old 19th March 2010, 11:58 AM   #6
bernhardn is offline bernhardn  Netherlands
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Did you read this?

Laserology
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Old 19th March 2010, 03:27 PM   #7
Calamaro is offline Calamaro  Europe
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Player is a Philips cd210.

Mods:
replaced filter capacitors/checked: ok
replaced opamps+bypass/checked: ok
non oversampling/checked: ok
connected 7805 regulator to main filter capacitor (with wires, my aim was to feed the dac)/checked: cd spins like crazy
removed 7805/checked: cd spins like crazy
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Old 20th March 2010, 03:05 AM   #8
Extreme_Boky is offline Extreme_Boky
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Before you connected the 7805 reg have you disconnected the original supply? This is a bit "tricky" - I hope you did it properly. I usually cut the track(s) and feed external supply as close as possible to section that needs it.
Also, have you connected the common of the 7805 to common on the PCB?

Boky
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Old 20th March 2010, 10:56 AM   #9
Calamaro is offline Calamaro  Europe
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Boky, actually I didn't connected the reg to dac, I just soldered it (through wires) to main filter capacitor. Common of the 7805 connected with capacitor minus leg. Then I checked the player before feed the dac with the new supply and the cd started to rotate like a catherine wheel
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Old 25th March 2010, 12:35 AM   #10
DrRick is offline DrRick  United States
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Sounds like you have lost the clock signal.

I would first try "un-doing" the NOS mod. If that doesn't help and you have no scope, I would next replace the digital filter chip (7220, I think?) which I believe also has the clock oscillator on it.

Good luck!
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