Marantz PM - 64 Mk 2 right channel out

[Deleted member 543346]

Pin 6 tracs like the others starting at 5 mv

Pin 1@2 tracks alot steeper than the other from 5 mv

 

[Netlist]

Pin 6 is the left output and is good. Pin 10 is the right output and you can not measure something decent.
They only thing left is to take out the STK and see if pin 1 & 15 give the same readings.
If they do, I think the STK is broken. Refer to the schematic in post #2.
Pin 1 - 6 is for the left channel and pin 10 - 15 is for the right (bad) channel.

 

[Deleted member 543346]

Yes i am pretty sure this stk is the issue.
I see some stk on ebay that i might take a chance on😅

 

[Netlist]

The 3122MKIII and 3152MKIII are also valid replacements. Keep us posted 🙂

 

[Deleted member 543346]

Yes will do.
Appreciate your time and knowledge...thank you 🙏

 

[Deleted member 543346]

The 3122MKIII and 3152MKIII are also valid replacements. Keep us posted 🙂

Could i use 3102 mk 2

 

[Netlist]

Difficult to tell because I can't find a datasheet for it.
Try a search here for there are many topics on that chip.

 

[huggygood]

It would seem that the STK3042 III is a correct replacement and available in a serious company, Dönberg.
https://www.donberg.fr/catalogue/semi-conducteurs/semi-conducteurs_stk-sz/stk_3042iii.html

 

[Netlist]

https://www.donberg.ie/descript/s/stk_3102iii.htm
They even have the 3102III.

 

[Deleted member 543346]

I ordered from ebay stk 3152 III

 

[huggygood]

99,9999999999999999 % are fake ,good luck .

 

[Deleted member 543346]

Thank you

 

[Deleted member 543346]

Little update.
The stk i ordered first was returned to sender , for some odd reason and i was refunded.
I did find stk 3102 iii from a closed tech shop , and my Marantz is up and running.

Also have a heatsink on the way to help that temp on stk.
Thank you for your help.

Best regards
RagnarB