I just replaced this chip and did the usual soldering of bad
connections on this 14 year old Sony.
Although the set now looks great the regulator IC runs too hot to
touch. The set has been operating for a couple of hours now but both
the chip as well as the heat sink are too hot it seems. I ESR'd the
caps in the power supply and they all look OK. Maybe hot is OK for this
circuit but I just thought I'd ask if anyone might have any thoughts on
this. Thanks. Lenny Stein, Barlen Electronics.

Can't use an A in those, need a plain 6301

JURB

wrote in message
oups.com...
Can't use an A in those, need a plain 6301

JURB

I have heard this many times, but have used the A version many times with no
problems. The difference according to Sanken datasheet notations is that
the hfe range for the A version is 20-40, while the non A rated version is
15-40. This is consistent with rank markings on other semiconductors.
These do run very hot. Some people have added heat sinks and fans. I have
not found it neccessary, but it may be helpful. Usually, if it is too hot
to touch there is something else wrong.

Leonard

Check for a leaky D623.

Leonard

wrote in message
oups.com...
I just replaced this chip and did the usual soldering of bad
connections on this 14 year old Sony.
Although the set now looks great the regulator IC runs too hot to
touch. The set has been operating for a couple of hours now but both
the chip as well as the heat sink are too hot it seems. I ESR'd the
caps in the power supply and they all look OK. Maybe hot is OK for this
circuit but I just thought I'd ask if anyone might have any thoughts on
this. Thanks. Lenny Stein, Barlen Electronics.

On 24 Feb 2006 13:45:20 -0800, "
wrote:

I just replaced this chip and did the usual soldering of bad
connections on this 14 year old Sony.
Although the set now looks great the regulator IC runs too hot to
touch. The set has been operating for a couple of hours now but both
the chip as well as the heat sink are too hot it seems. I ESR'd the
caps in the power supply and they all look OK. Maybe hot is OK for this
circuit but I just thought I'd ask if anyone might have any thoughts on
this. Thanks. Lenny Stein, Barlen Electronics.


Every one of these I've seen ran too hot to touch (that's why they
only last a few years). It seems to be normal for these sets. On the
last few I repaired, I mounted the heat sink so that the fins ran
vertically.
Andy Cuffe