Any modification for replacing STK3102-IV

Crecencio · 10th December 2005, 04:31 PM

Any expert can help me on this problem.STK3102-IV used in Marantz amplifier
PM80SE in pre-amp section it drives 4 output devices. I replaced STK with
STK3102 IV unfortunately not successful no quescent current running. If there
is any modification possible to mount STK with similar rating on the heatsink
with inter change pin connection is highly appreciated.

Crecencio

anatech · 10th December 2005, 04:55 PM

Hi Crecencio,
Looking at the III version, I see pins 5, 11 are constant current sinks and pins 6,10 are the driven outputs. Your driver transistors would be connected between pins 5 and 6 for example. If you have voltage to this chip and no bias, then something (like a resistor) is open, or your bias control circuit is shorted.

Didn't find a sheet on the type IV.

-Chris

Leolabs · 11th December 2005, 03:42 AM

try www.datasheetarchive.com for the datasheets of both STKs.

Crecencio · 14th December 2005, 11:03 AM

Hi Guys,

I checked with version III didn’t make any difference. I think problem somewhere in bias. But look strange in both channels. So how much voltage should i get on pin 5, 6 /10, 11. I measure around + - 1.3 to 1.5.and the STK
Chip gets warm after 3 to 5 min. To drive the bias control circuit 1.5v is sufficient?

Crecencio

anatech · 14th December 2005, 12:28 PM

Hi Crecencio,
The bias is generated within the STK chip. 1.5V may not be enough, but that voltage is dependant on your output circuit. The actual voltage drop does not matter (within reason) to the chip. It supplies a current, your output circuit drops whatever voltage in response to that current.

Look at your bias circuits. Is the control turned down too far?

Those chips are designed to run warm.

-Chris

10th December 2005, 04:31 PM	#1
Crecencio diyAudio Member Join Date: Apr 2005 Location: India Goa	Any modification for replacing STK3102-IV Any expert can help me on this problem.STK3102-IV used in Marantz amplifier PM80SE in pre-amp section it drives 4 output devices. I replaced STK with STK3102 IV unfortunately not successful no quescent current running. If there is any modification possible to mount STK with similar rating on the heatsink with inter change pin connection is highly appreciated. Crecencio

14th December 2005, 11:03 AM	#4
Crecencio diyAudio Member Join Date: Apr 2005 Location: India Goa	Any modification for replacing STK3102-IV Hi Guys, I checked with version III didn’t make any difference. I think problem somewhere in bias. But look strange in both channels. So how much voltage should i get on pin 5, 6 /10, 11. I measure around + - 1.3 to 1.5.and the STK Chip gets warm after 3 to 5 min. To drive the bias control circuit 1.5v is sufficient? Crecencio

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10th December 2005, 04:55 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Crecencio, Looking at the III version, I see pins 5, 11 are constant current sinks and pins 6,10 are the driven outputs. Your driver transistors would be connected between pins 5 and 6 for example. If you have voltage to this chip and no bias, then something (like a resistor) is open, or your bias control circuit is shorted. Didn't find a sheet on the type IV. -Chris

11th December 2005, 03:42 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	try www.datasheetarchive.com for the datasheets of both STKs.

14th December 2005, 12:28 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Crecencio, The bias is generated within the STK chip. 1.5V may not be enough, but that voltage is dependant on your output circuit. The actual voltage drop does not matter (within reason) to the chip. It supplies a current, your output circuit drops whatever voltage in response to that current. Look at your bias circuits. Is the control turned down too far? Those chips are designed to run warm. -Chris

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