User Profile

mikkele86 started a topic Marantz PM 25 - looking for potentiometer RM050 / M50KC

in Troubleshooting Audio Equipment

05-13-2024, 02:34 PM
Marantz PM 25 - looking for potentiometer RM050 / M50KC

Hello. im renovation a Marantz Console Stereo Amplifier PM 25.

One of the potentiometer for the tone control is broken and im having troubles finding a replacement.

I know its 50K ohm.
i think its reverse log.
and 6 pin. Stereo.

The parts list says its a RS05030350

[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"353","width":"281","data-attachmentid":3270252}[/ATTACH] [ATTACH=JSON]{"data-align":"none",&qu...

See more | Go to post
mikkele86 started a topic Luxman R-5045 - Cant adjust current bias

in Troubleshooting Audio Equipment

04-24-2024, 10:19 AM
Luxman R-5045 - Cant adjust current bias

Hello good people of badcaps.

im back with another question

Im trying adjust the current bias accordingly to the manual, but my meter is showing the same value no matter whatever position VR-804a/VR-804b is in.

DC bias is adjusted and is working as intended.

Is my settings on the multimeter wrong ? or should i look for a bad component

note: all transistor are new

Picture from manual
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"444","title":"image.png","width":"687","data-attachmentid":3259133}[/ATTACH]...

See more | Go to post
mikkele86 started a topic Luxman R-5045 - Voltage too high accordingly to schematic

in Troubleshooting Power Supplies and Power Supply Design

04-20-2024, 07:18 AM
Luxman R-5045 - Voltage too high accordingly to schematic

Hello.

got this Luxman R-5045 vintage amplifier which need a good repair and service.
finally got i started up and started to check voltages.

My issues is that the voltage measured is 3,5v to 4v higher than whats stated in the schematic.
Meaning voltages like +9v is like +13v
and +31v is measured to 34.6v which is really close to the capacitors rating +35v

I measured the voltage before the rectifier and im measuring 27v
did a online calculator and it showed i should actually get +36v after the recifier :/

So my question...

See more | Go to post
mikkele86 replied to Luxman R-5045 - Needing help identifying component in AM/FM module

in Troubleshooting Audio Equipment

04-19-2024, 04:00 PM
ahh okay. many thanks

See more | Go to post
Leave a comment:
mikkele86 replied to Luxman R-5045 - Needing help identifying component in AM/FM module

in Troubleshooting Audio Equipment

04-19-2024, 03:26 PM
and the back look ilke this

[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3256020}[/ATTACH]and the back look ilke this

[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3256020}[/ATTACH]...

See more | Go to post
Leave a comment:
mikkele86 started a topic Luxman R-5045 - Needing help identifying component in AM/FM module

in Troubleshooting Audio Equipment

04-19-2024, 03:05 PM
Luxman R-5045 - Needing help identifying component in AM/FM module

hello.

I came across this thing and im not sure what it is exactly, I have never seen such thing before.
I know it gotta be some kind of diode with Drain, Source and Gate1 and gate2

It resides in AM/FM module and im measuring 200ohm across D and S.

[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"705","title":"image.png","width":"782","data-attachmentid":3256012}[/ATTACH]hello.

I came across this thing and im not...

See more | Go to post
mikkele86 replied to Luxman R-5045 - Capacitor at amplifier output broke, can i replace with higher capacitance ?

in Troubleshooting Audio Equipment

04-16-2024, 02:06 PM
Nevermind,i got the answer from internet search

See more | Go to post
Leave a comment:
mikkele86 started a topic Luxman R-5045 - Capacitor at amplifier output broke, can i replace with higher capacitance ?

in Troubleshooting Audio Equipment

04-16-2024, 12:37 PM
Luxman R-5045 - Capacitor at amplifier output broke, can i replace with higher capacitance ?

Hello Im renovation a Luxman R-5045

On the attached picture there is a cap 0.047uF (47nF) and a resistor, 10ohm. What is their purpose ? and what would happend if I were to replace the caps with lets say, 10nF or 100nF ?
because thats what i got in stock :/

[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"566","title":"0,047 uF.jpg","width":"829","data-attachmentid":3253926}[/ATTACH]Hello Im renovation a Luxman R-5045

On the...

1 Photo

See more | Go to post
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-11-2024, 12:19 PM
its alive 🤩

thanks for the inputs

[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"1043","title":"20240111_191518.jpg","width":"470","data-attachmentid":3176832}[/ATTACH]its alive 🤩

thanks for the inputs

[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"1043","title":"20240111_191518.jpg","

See more | Go to post
Leave a comment:
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-10-2024, 01:48 PM
Measured the gate resistor, 15ohm as stated. Path from Gate Pin on the IC to the pad where IGBT gate is, is also fine.
I did some reading on the gate driver and I think the driver is in a UVLO state. Under Voltage Lock-Out.

Im measuring +10.5v on the VCC pin on the IC.

[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3176221}[/ATTACH]

Im measuring +4.5v on the SD (shutdown) pin
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"472","title":"image.png","width":"693","data-attachmentid":3176222}[/ATTACH]...

See more | Go to post
Leave a comment:
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-09-2024, 04:04 PM
Got the bulbs. used the 100watt, lights up for split sec.
Everything seems to be running without the IGBTs

I have taken some measurements, with COM/negativ from the oscilloscope to the COM on the PCB (pin 8 on gate driver)
hope its done right 😅

HO and LO gate at the same time.
HO - pin 13 channel A (upper)
LO - pin 11 channel B (lower)
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"892","width":"402","data-attachmentid":3175682}[/ATTACH]...

See more | Go to post
Leave a comment:
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-07-2024, 10:58 AM
got it. just made ordre online, couldnt find any local retailer which had old style incandescent light bulb.
ill will post again when things are ready

See more | Go to post
Leave a comment:
mikkele86 commented on petehall347's reply to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-07-2024, 09:46 AM
dang it. your right. need to go shopping then

See more | Go to post
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-07-2024, 09:13 AM
will try a incandescent lamp in series.

I got a 40W, will it do the trick ?
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3174413}[/ATTACH]...

See more | Go to post
Leave a comment:
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-07-2024, 05:39 AM
Thanks for pointing that out CapsLeaker.
there is a huge difference in rise and fall times.

IRBG20B60PD
[ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3174309}[/ATTACH]

Bournes
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"126","width":"831","data-attachmentid":3174307}[/ATTACH]

IKP20N65H5
[ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3174306}[/ATTACH]...

See more | Go to post
Leave a comment:
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-06-2024, 03:47 PM
I have my DE-5000 LCR meter, i can measure ESR and capacity but not leakage....

See more | Go to post
Leave a comment:
mikkele86 replied to Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-06-2024, 09:13 AM
thought i attached at PDF schematic, but its gone. i will try again with the schematic.
But the Gate driver is the only IC on the board, nothing on th back [ATTACH]n3173959[/ATTACH]...

See more | Go to post
Leave a comment:
mikkele86 started a topic Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

in Troubleshooting Power Supplies and Power Supply Design

01-06-2024, 06:45 AM
Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000

hello.

I have two power amplifiers, both having their IGBT blown on the PSU.
The original mounted IGBT where marked with [B]IRGB20B60PD1PbF [/B]and the gate driver is a [B]IR2156STRPBF[/B].

I looked at mouser and digikey and could not find any available [B]IRGB20B60PD1PbF [/B]and somehow ended up using a Bourns [B]BIDW20N60T[/B].
I replaced the gate driver, the gate resistor and both IGBT. But as soon power is turned on, both IGBT shorts out completely (gate, emitter, collector) and the fuse on the AC line gets killed.

So I though i missed a capacitor...

See more | Go to post

Last edited by mikkele86; 01-06-2024, 09:17 AM.
mikkele86 replied to How to probe TP7002 for AP_PS_HOLD on SM-G930F?

in Troubleshooting Laptops, Tablets, and Mobile Devices

01-03-2023, 01:38 AM
Re: How to probe TP7002 for AP_PS_HOLD on SM-G930F?

Hello

I did reply to your messages from GSM-forum.
But your post here has more depth

to keep it short, I would scrape off the top layer of TP7002. Then you can take measurements on the exposed copper

Best regards
mikkel

See more | Go to post
Leave a comment:
mikkele86 replied to Dell Inspiron 13 5379, need Bios and EC for MEC1416-NU

in BIOS Requests ONLY!

07-07-2022, 12:28 PM
Re: Dell Inspiron 13 5379, need EC for MEC1416-NU

succes its trying to start but shutdown after a few sec.
it was original with water damage, time for some probing.

Thanks ...

See more | Go to post
Leave a comment: