Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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HiFi
 
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Default .Denon PMA-860


Hi There!

I need to know the specification for transformer inside
this Amplifier.(Got one with def. transf.)But no mark on it.

Please,take a look at yours if You got one.

Thanks,



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Rono
 
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Some units, you replace the fuse in the
primary of the transformer! Rono.

"HiFi" wrote in message
...

Hi There!

I need to know the specification for transformer inside
this Amplifier.(Got one with def. transf.)But no mark on it.

Please,take a look at yours if You got one.

Thanks,





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Leonard Caillouet
 
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Never saw a bad transformer in one of these. Check for a thermal fuse like
another poster suggested.

Leonard

"Rono" wrote in message
...
Some units, you replace the fuse in the
primary of the transformer! Rono.

"HiFi" wrote in message
...

Hi There!

I need to know the specification for transformer inside
this Amplifier.(Got one with def. transf.)But no mark on it.

Please,take a look at yours if You got one.

Thanks,







  #4   Report Post  
HiFi
 
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Thanks for Your replays!

I have measured directly on the transformer.
On the Primary side there is 2 windings connected together in serial.
On of these windings are open.
But strange to me is that this transformer has no mark/Stamp on it,nothing.
It has only one number saying 2335989001 and 5.6 N
this is all.The transformer is round,black and in a cast material.
Maybe it is not a Original Transformer?
Anyway i need the specifications for the Original one?

Thanks,




"Leonard Caillouet" skrev i melding
news:Ow8Hd.31374$jn.26351@lakeread06...
Never saw a bad transformer in one of these. Check for a thermal fuse
like
another poster suggested.

Leonard

"Rono" wrote in message
...
Some units, you replace the fuse in the
primary of the transformer! Rono.

"HiFi" wrote in message
...

Hi There!

I need to know the specification for transformer inside
this Amplifier.(Got one with def. transf.)But no mark on it.

Please,take a look at yours if You got one.

Thanks,









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Remove _ for valid address
 
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Default

In article , HiFi wrote:
I have measured directly on the transformer.
On the Primary side there is 2 windings connected together in serial.
On of these windings are open.
But strange to me is that this transformer has no mark/Stamp on it,nothing.
It has only one number saying 2335989001 and 5.6 N
this is all.The transformer is round,black and in a cast material.
Maybe it is not a Original Transformer?
Anyway i need the specifications for the Original one?


My approach would be to use the existing working half of the primary
to power up the unit, from a 115V AC source. If you don't have a
suitable 230-115 transformer (or a variac - a continuously variable one)
then perhaps you could borrow one for this purpose.

Powered this way, you can then measure all the secondary AC voltages.
You ought not to run the unit at full power when powered this way, or
at least not for long, as the power rating of the transformer is
effectively halved.

The total VA rating can be estimated quite accurately by comparing the
weight of the transformer with ones of similar style in catalogues.
(Or maybe the unit has the AC input power stated on the back.)

If there are multiple secondary windings, you can estimate the ratio of
their currents from the ratio of the cross-sectional-area of the wires
coming out.

Hope this helps,
Mike.

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