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Old 29th November 2012, 01:52 AM   #1
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Default CL-15 schematics: blowing mains fuse

Does anyone have a copy of California Audio Labs CL-15 schematics? It would help with diagnosing the mains fuse blowing immediately on power on.
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Old 29th November 2012, 10:09 AM   #2
Mooly is offline Mooly  United Kingdom
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I can't help with a circuit but can say that if the mains fuse is blowing then its usually something fundamantal. Does it use an SMPS (switching) type supply. If so then failure of the switching element (transistor FET or IC) is likely together with other failed components. The underlying cause must also be found, usually electrolytic caps that have developed a high E.S.R.

Hopefully it uses a normal PSU and if so you should look for short circuit rectifiers on the secondaries, also check any filter caps across the mains supply and finally the transformer itself. Disconnect all secondaries and if it still blows the fuse then the tranny is faulty (rare but it happens).
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Old 1st December 2012, 10:06 AM   #3
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Quote:
Originally Posted by dave.engel View Post
Does anyone have a copy of California Audio Labs CL-15 schematics? It would help with diagnosing the mains fuse blowing immediately on power on.
I think, this is follow device:
California Audio Labs CL-15 CD player | Stereophile.com

First step in such cases is to disconnect the transformer secondary windings from the PCB's. Second step is the remove of the snubber capacitor in parallel to the two mains input leads - if present.

If now the mains fuse blowing again, the primary coil from one of the mains transformers are damaged.
Otherwise you will be happy, because all the other parts are not so expensive.

Before you start with your troubleshooting, call and ask there at first step:
repair@approvedaudioservice.com
phone: 860-567-5801
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Last edited by tiefbassuebertr; 1st December 2012 at 10:15 AM.
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Old 17th December 2012, 02:01 AM   #4
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Quote:
Originally Posted by tiefbassuebertr View Post
I think, this is follow device:
California Audio Labs CL-15 CD player | Stereophile.com

First step in such cases is to disconnect the transformer secondary windings from the PCB's. Second step is the remove of the snubber capacitor in parallel to the two mains input leads - if present.

If now the mains fuse blowing again, the primary coil from one of the mains transformers are damaged.
Otherwise you will be happy, because all the other parts are not so expensive.

Before you start with your troubleshooting, call and ask there at first step:
repair@approvedaudioservice.com
phone: 860-567-5801
Thanks, and correct unit. There are two transformers with primaries in series with various taps to get multi-country voltages. One of these has overheated and is damaged.
With this arrangement it is hard to work out what the VAC of the various primaries are. It looks like 2x 15-0-15? (feed +15,-15V as per PCB markings) dual mono for L+R channels analogue & DAC, and two other windings probably for digital + and disk unit.
Also, it looks like there is a separate winding used on the transformer that feeds D708 then a 22k resistor—I suspect it is some sort of AC detect to cut power quickly on shut off.
If anyone knows what the transformer secondary VAC specifications are it would be helpful so I can replace with appropriate toroids.
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