sony HST-550W service manual question??? - diyAudio
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Old 17th August 2011, 10:43 PM   #1
dmx2020 is offline dmx2020  New Zealand
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Default sony HST-550W service manual question???

Hi guys,

There appears to be an error in the service manual of this stereo. It is found here: SONY HST-550W E SM Service Manual free download, schematics, eeprom, repair info for electronics

On page 24, the STK IC (main audio IC) is given as the STK4131ii,

but

on page 32 and 45, the STK IC is given as the STK4152ii.

See the attached photos. So what is the corrct IC for this stereo? STK4131ii or STK4152ii ?? ??

Thank you in advance!
Attached Images
File Type: jpg fig1.JPG (304.0 KB, 64 views)
File Type: jpg fig2.JPG (147.6 KB, 59 views)
File Type: jpg fig3.JPG (196.8 KB, 56 views)
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Old 18th August 2011, 09:13 PM   #2
dmx2020 is offline dmx2020  New Zealand
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Heres some more info:

The HST-550W is rated with:

25W + 25W continuous RMS power (6 ohms, 1 kHz, 5% THD)
Peak power output: 350W
Total power consumption: 75Watts


Now the STK4131ii (from the datasheet): 20W + 20W (8 Ohms, 20-20kHz, 0.4% THD)

And the STK 4152ii (from the datasheet): 30W + 30W (8 Ohms, 20-20kHz, 0.4% THD)


Also the HST-750W (next model up) is rated at 35W + 35W RMS and it has a STK4141ii (which has 25W +25W from the datasheet)

And the HST-950W (next model) is rated at 50W + 50W RMS (power consumption 130W) and it has a STK4182ii (which is 45W + 45W from the datasheet)

Hope this stuff helps with the answer to the previous post. I really need to know the correct IC as Im replacing the STK IC of the HST550W and the existing IC is missing from the PCB!!!
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Old 22nd August 2011, 04:47 AM   #3
dmx2020 is offline dmx2020  New Zealand
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Lightbulb Solved! :smash:

I have solved my own problem Solution for anyone following in the future is below.

The correct IC for the HST-550w (E model) is STK4152ii.

The correct IC for the HST-550w (AEP/UK model) is STK4131ii.

So it seems there are different ICs for the same sony product in different regions. The E model is rated as 350 peak watts (STK4152ii) and the AEP/UK model is rated as 25w+25w rms (STK4131ii).

Confirmation can be found in the Service manuals:
AEP/UK model is here: Sony HST-550W Service Manual PDF Download

E model is here:
SONY HST-550W E SM Service Manual free download, schematics, eeprom, repair info for electronics

Cheers!
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Old 10th October 2012, 04:36 AM   #4
dmx2020 is offline dmx2020  New Zealand
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Join Date: May 2005
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Some more info for the furure reference:

SONY HST 550W
STK4131ii (AEP/UK)
STK4152ii (E)

Output
25W RMS x 2 (AEP/UK)
350W Peak Power (E)

Consumption
80W (AEP)
170W (UK)
75W (E)

Speakers
SS-D550 (E)
SS-A750 (AEP/UK)



SONY HST750W -

STK4141ii (AEP/UK)
STK41??ii (E)

Output
35W RMS x 2 (AEP/UK)
???W Peak Power (E)

Consumption
90W (AEP)
190W (UK)
100W (E)

Speakers
APM-D750 (E)
SS-A750 (AEP/UK)

SONY HST950W

STK4152ii (AEP/UK)
STK4182MK2 (E)

Output
50W RMS x 2 (AEP/UK)
500W Peak Power (E)

Consumption
120W (AEP)
250W (UK)
130W (E)

Speakers
APM-D950 (AEP/UK)
SS-A950 (E)

Last edited by dmx2020; 10th October 2012 at 04:56 AM.
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Old 10th October 2012, 05:26 AM   #5
dmx2020 is offline dmx2020  New Zealand
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Pics
Attached Images
File Type: jpg HST550W (AEP_UK).jpg (155.2 KB, 18 views)
File Type: jpg HST750W_(AEP_UK).jpg (29.7 KB, 19 views)
File Type: jpg HST750W_(E).jpg (22.7 KB, 4 views)
File Type: jpg HST950W (E).jpg (149.3 KB, 4 views)
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