CD17 120V unit plugged into 230 V! Help! - Page 2 - diyAudio
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Old 10th November 2004, 09:17 PM   #11
guido is offline guido  Netherlands
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Quote:
Originally posted by ashok
Any idea what chip that is?
Had a broken display on a CD60 (characters lit up that shouldn't randomly) and it turned out to be the chip underneith the display.

Was a TFK chip from telefunken. But i think the cd17 is newer and made in japan (?), so probably you have some jap version of such a chip. I couldn't buy a replacement (unless >1000 at a time ), so i took one out of a CD40.

But in your case, could be the display, this chip or the powersupply (or a combination). Getting the servicemanual seems like the best thing to do.

Good luck
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Old 10th November 2004, 10:03 PM   #12
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Lightbulb Zener?

Hello ashok, If your display is a vacuum tube display there is a zener diode in the supply of the display. Very probably the zener is KAPUT hence the low voltage as zeners fail by short circuit. Find the zener and replace it. Could perhaps be the BY85 24V zener, but that is a very vague schematic I possess
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Old 11th November 2004, 12:14 AM   #13
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Default Re: Zener?

Quote:
Originally posted by Elso Kwak
Hello ashok, If your display is a vacuum tube display there is a zener diode in the supply of the display. Very probably the zener is KAPUT hence the low voltage as zeners fail by short circuit. Find the zener and replace it. Could perhaps be the BY85 24V zener, but that is a very vague schematic I possess
Exactly, must be the same unclear scan of the schematic that I have.
Check that zener, most probably that's the problem.
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Old 11th November 2004, 03:36 AM   #14
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Default A ray of light ( hope)...........in the distance !

Hi Elso and Carlosfm,
I would be really grateful if any one of you can email me a scan of the diagram you have? A fuzzy one is better than no diagram.
I haven't been able to find an alternative source for it yet.

ashokm(at)sify.com

Is the zener on the main board or the display board ?

I used the machine several times with the dark display and it didn't feel good at all. The brain keeps nagging me in the background all the time. I'll have to fix this.

Thanks .
Ashok.
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Old 11th November 2004, 07:18 PM   #15
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Default Re: A ray of light ( hope)...........in the distance !

Quote:
Originally posted by ashok
Is the zener on the main board or the display board ?
Dunno, it's on the schematic.
It doesn't specify the location, and I don't know the insides of the CD17.
Anyway, you have mail.
Check the bottom right corner of the schematic.
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Old 12th November 2004, 11:59 AM   #16
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Default Thanks to all for your posts, especially .....

Thanks especially to Elso Kwak , Carlosfm and Apolon34.
I did find that the -24 volts to the display started on the main board and reached the display via the connector. This voltage was missing.
The rectified 24 volt ac appears as a -ve 28 volts across a 100uF/50V capacitor ( CY81 ) . It then goes to the regulator transistor QY81 .
There was no voltage across the regulator transistor or the 100uF cap. I found that the rectified voltage went to the supply capacitor through a 10 ohm SMD (RY80) resistor. This was blown.
I soldered a 1/4 watt 10 ohm resistor ( axial leads) across this SMD part. The resistor was mounted vertically.
The display now works fine. However it might have been a fusible resistor and I will have to look for one fusible 10 ohm SMD resistor ...............whew, that might be a problem.
Thank God for that resistor , it saved the rest of the circuit from cooking.
Apart from other parts an exploding capacitor can really ruin the insides ! I get a nightmare just thinking about it.

Well all's well now . Thanks again to all and especially to Elso , Carlosfm and Apolon34.
Cheers,
Ashok.
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