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Old 30th November 2014, 04:23 PM   #1
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Default Help Philips Cd460

Hi,

I was recently playing with IV conversion in my CD460.
I have added a D1 inspired IV conversion. I liked the sound very much. Then I started playing with a separate power supply for SAA7220. There something went wrong. The player does not recognize CDs. I removed the regulator (but left a bigger cap at leg 24 (VDD) of the SAA7220) It does not spin when I close the drawer. You cannot spin the CDs by hand either. It looks like some magnetic force keeps it in its position.
I have the service manual but do not have an osciloscope. Is there anything I can do using just a multimeter? The VDD of the SAA7220 is at 4.85V. This looks ok to me.

I do not have any formal electronic education. Just some common sense.
I would love to get this machine going as the sound was very good.

Any help will be very much appreciated.

Greg
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Old 30th November 2014, 04:53 PM   #2
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check Lukasz Fikus Lampizator for additional information, for related cd modification.
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Old 30th November 2014, 05:42 PM   #3
Mooly is offline Mooly  United Kingdom
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If the CD will not turn by hand and the power is OFF then there is a major mechanical issue. If it is more a case of very hard to turn (but only when the power is on) then it could be something as simple as a missing rail (I'm assuming it uses the Hall Effect type motor and not a simple DC type.)
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Old 30th November 2014, 06:35 PM   #4
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Hi Mooly,

I can turn it easily, when the power is off. It is difficult to turn it with the power on. Will check the rails.

Greg
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Old 30th November 2014, 07:33 PM   #5
Mooly is offline Mooly  United Kingdom
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Look out for fusible resistors too, Philips often sprinkled these around the boards. One could be open circuit.
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Old 30th November 2014, 09:38 PM   #6
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Mooly,

Looks like -11V is missing. I guess BC818 (which I believe provides some sort of regulation) is dead. I have some -13V on the emitter. The base resistor (which goes to the ground) is ok. The collector should be at -11V but is 0. I will google bc818 and if I have anything similar I will put it in. Meanwhile will order smd bc818 as the original.



Greg
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Old 30th November 2014, 09:57 PM   #7
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I see that I have BC818-25 as muting transistors on the same board. I guess they could jump in for BC818-16. I am bypassing muting transistors anyway...

Greg
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Old 1st December 2014, 07:22 AM   #8
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Sounds promising. The BC818 is a general purpose NPN (800ma current rating). The "16" is one of the lower hfe groups so should be fine to swap for a higher one.
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Old 1st December 2014, 09:19 AM   #9
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Hi Mooly,

Yes I am also positive now. Will try tonight (if time allows - kids new to be brought to/from a choir practice). Otherwise tomorrow! Fingers crossed.

Greg
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Old 1st December 2014, 09:46 AM   #10
Mooly is offline Mooly  United Kingdom
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OK Good luck.
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