Hello I received a Marshall Stanmore speaker with a damaged converter from a colleague for repair (he himself got this speaker as part of the settlement and does not know its past). The diagram for this model is practically unavailable, so I am asking you to identify the elements: U1 - it had a...

The typical diagram for this circuit will be helpful, as well as the application note of the SG6841SZ - a practical equivalent (note, a different value of the RI-pin 4 resistor = 33 k?, see page 11). You must identify the individual elements based on them and recreate the diagram of your power supply.

Hi I read on mine ob2269cp, R18 and R104 are marked R100. Take a look at R10 and R19, DZ3. They have all been broken for me. Good luck I can't do it, I'm French, I don't speak Polish.

I have the same problem: r104 and r18 was burnt and i cant read anything.

Hi, i have the same problem, no power, but i have all the component good, i can help you with the problem if you want, but i need to know something about the tristar 13030122, about the pin conf, because maybe that is the problem in my case. best regards

This is not the same problem, but similar only because of damaged resistors.

I have one at my workshop r104 and r18 - 10 ? u1 - fqpf10n60c for me it is burnt u15 (power amplifier) could you give me what element is it?

Dear, I have the same problem, but I change the u15 ic and nothing works, I have problem I think with the Tristar transformer, can you tell the voltage of that? Best regards

One must measure these voltages present in the system and verify with catalog data. This will determine the power status. link page: 6.3 Recommended Operating Conditions

Help me, my Q7 missing, what number?

It may be useful, the resistor R18 is marked R100. I am attaching photos, taken from the equipment I repaired, where the 220uF / 35V electrolyte died.

[Solved] Identifying Components of Marshall Stanmore Speaker: U1, R104, R18 - OB2268CP or OB2269CP?

DJ Davi 37428 11

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#1 17032225 12 Feb 2018 18:50

DJ Davi DJ Davi

Level 21

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Post #1
17032225 12 Feb 2018 18:50

Hello
I received a Marshall Stanmore speaker with a damaged converter from a colleague for repair (he himself got this speaker as part of the settlement and does not know its past).

The diagram for this model is practically unavailable, so I am asking you to identify the elements:
U1 - it had a burned hole. I was able to read the designation OB226. I suspect it might be OB2268CP or OB2269CP. Unfortunately, I am not sure, because the one that was there (the one with the burned hole) had traces that it was soldered and could be wrong.
R104 - unfortunately, nothing can be seen on this resistor.

R18 - this resistor was missing, it was on the other side of the board.
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#2 17044585 17 Feb 2018 21:29

aaanteka aaanteka

Level 42
» | Positive voted Helpful post? (+7)

Post #2
17044585 17 Feb 2018 21:29

The typical diagram for this circuit will be helpful, as well as the application note of the SG6841SZ - a practical equivalent (note, a different value of the RI-pin 4 resistor = 33 k?, see page 11). You must identify the individual elements based on them and recreate the diagram of your power supply.

Attachments:

iro33.0001.b5_sg6841v2.1.pdf Download (533.79 KB) Punkty: 4 for the user
#3 17053877 21 Feb 2018 19:32

Lolo81700 Lolo81700

Level 12

» | Helpful post? (+3)

Post #3
17053877 21 Feb 2018 19:32

Hi
I read on mine ob2269cp, R18 and R104 are marked "R100".
Take a look at R10 and R19, DZ3. They have all been broken for me.

Good luck
I can't do it, I'm French, I don't speak Polish.
#4 17180389 21 Apr 2018 16:20

pazenz pazenz

Level 1

» | Positive voted Helpful post? (+9)

Post #4
17180389 21 Apr 2018 16:20

I have the same problem:
r104 and r18 was burnt and i cant read anything.
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#5 17265773 08 Jun 2018 21:57

mattpalominos mattpalominos

Level 2

» | Helpful post? (0)

Post #5
17265773 08 Jun 2018 21:57

Hi, i have the same problem, no power, but i have all the component good, i can help you with the problem if you want, but i need to know something about the tristar 13030122, about the pin conf, because maybe that is the problem in my case.

best regards
#6 17274697 13 Jun 2018 20:32

aaanteka aaanteka

Level 42

» | Helpful post? (0)

Post #6
17274697 13 Jun 2018 20:32

pazenz wrote:
I have the same problem:
r104 and r18 was burnt and i cant read anything.

This is not the same problem, but similar only because of damaged resistors.
#7 17299481 27 Jun 2018 11:53

harnol harnol

Level 10

» | Helpful post? (+2)

Post #7
17299481 27 Jun 2018 11:53

I have one at my workshop

r104 and r18 - 10 ?
u1 - fqpf10n60c

for me it is burnt u15 (power amplifier) could you give me what element is it?
#8 17299588 27 Jun 2018 12:56

mattpalominos mattpalominos

Level 2

» | Positive voted Helpful post? (+7)

Post #8
17299588 27 Jun 2018 12:56

Dear, I have the same problem, but I change the u15 ic and nothing works, I have problem I think with the Tristar transformer, can you tell the voltage of that?
Best regards
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#9 17301796 28 Jun 2018 15:42

aaanteka aaanteka

Level 42

» | Helpful post? (+3)

Post #9
17301796 28 Jun 2018 15:42

One must measure these voltages present in the system and verify with catalog data. This will determine the power status.
link

page: 6.3 Recommended Operating Conditions
#10 17429330 08 Sep 2018 14:04

Kimera Kimera

Level 1

» | Helpful post? (0)

Post #10
17429330 08 Sep 2018 14:04

Help me, my Q7 missing, what number?
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#11 17445259 17 Sep 2018 15:33

Darekg Darekg

Level 17

» | Helpful post? (+2)

Post #11
17445259 17 Sep 2018 15:33

It may be useful, the resistor R18 is marked R100. I am attaching photos, taken from the equipment I repaired, where the 220uF / 35V electrolyte died.
#12 19305738 08 Mar 2021 21:29

DJ Davi DJ Davi

Level 21

» | Topic author Helpful post? (0)

Post #12
19305738 08 Mar 2021 21:29

The damaged U1 chip is OB2268CP. The resistors I asked for are 10 ?. In addition, unfortunately, I had to replace the power terminal, after which the speaker returned to work.
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Topic summary

The discussion revolves around identifying components of a Marshall Stanmore speaker, specifically focusing on the damaged U1 converter and resistors R104 and R18. Users share insights on the U1 component, suggesting it is likely an OB2268CP, with some uncertainty regarding the exact model due to previous damage. Resistor R104 is noted to be marked as "R100," while R18 is reported missing. Several users report similar issues with burnt components and offer advice on troubleshooting, including checking voltages and replacing damaged parts. The conversation highlights the need for a schematic diagram for accurate repairs and mentions the SG6841SZ as a potential equivalent for U1.
Summary generated by the language model.